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Runaway BN supergiant star HD 93840: Progenitor of an imminent core-collapse supernova above the Galactic plane Astron. Astrophys. (IF 5.4) Pub Date : 2024-06-28 D. Weßmayer, M. A. Urbaneja, K. Butler, N. Przybilla
We present a quantitative spectral analysis of the extreme nitrogen-enhanced supergiant HD 93840 (BN1 Ib) at an intermediate galactic latitude. Based on an optical high-resolution spectrum and complementary ultraviolet and infrared (spectro-)photometry, in addition to Gaia data, we carried out a full characterisation of the star’s properties. We used both hydrostatic and unified (photosphere+wind)
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Search and analysis of giant radio galaxies with associated nuclei (SAGAN) Astron. Astrophys. (IF 5.4) Pub Date : 2024-06-28 Shishir Sankhyayan, Pratik Dabhade
We investigated the prevalence of giant radio galaxies (GRGs), some of the largest structures powered by supermassive black holes, within supercluster environments, and the influence of such environments on their properties. Utilising two large catalogues of superclusters (401) and GRGs (1446), we established the existence of 77 GRGs (5.3%) residing in 64 superclusters (16%) within 0.05 ≤ z ≤ 0.42
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Constraints on the formation history and composition of Kepler planets from their distribution of orbital period ratios Astron. Astrophys. (IF 5.4) Pub Date : 2024-06-27 Di-Chang Chen, Christoph Mordasini, Ji-Wei Xie, Ji-Lin Zhou, Alexandre Emsenhuber
Context. The Kepler high-precision planetary sample has revealed a ‘radius valley’ separating compact super-Earths from sub-Neptunes with lower densities. Super-Earths are generally assumed to be rocky planets that were probably born in situ, while the composition and formation of sub-Neptunes remains debated. Numerous statistical studies have explored planetary and stellar properties and their correlations
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CHEX-MATE: Turbulence in the intra-cluster medium from X-ray surface brightness fluctuations Astron. Astrophys. (IF 5.4) Pub Date : 2024-06-27 S. Dupourqué, N. Clerc, E. Pointecouteau, D. Eckert, M. Gaspari, L. Lovisari, G. W. Pratt, E. Rasia, M. Rossetti, F. Vazza, M. Balboni, I. Bartalucci, H. Bourdin, F. De Luca, M. De Petris, S. Ettori, S. Ghizzardi, P. Mazzotta
The intra-cluster medium is prone to turbulent motion that will contribute to the non-thermal heating of the gas, complicating the use of galaxy clusters as cosmological probes. Indirect approaches can estimate the intensity and structure of turbulent motions by studying the associated fluctuations in gas density and X-ray surface brightness. In this work, we aim to constrain the gas density fluctuations
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Resonant sub-Neptunes are puffier Astron. Astrophys. (IF 5.4) Pub Date : 2024-06-27 Adrien Leleu, Jean-Baptiste Delisle, Remo Burn, André Izidoro, Stéphane Udry, Xavier Dumusque, Christophe Lovis, Sarah Millholland, Léna Parc, François Bouchy, Vincent Bourrier, Yann Alibert, João Faria, Christoph Mordasini, Damien Ségransan
A systematic, population-level discrepancy exists between the densities of exoplanets whose masses have been measured with transit timing variations (TTVs) versus those measured with radial velocities (RVs). Since the TTV planets are predominantly nearly resonant, it is still unclear whether the discrepancy is attributed to detection biases or to astrophysical differences between the nearly resonant
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Vertical shear instability with dust evolution and consistent cooling times Astron. Astrophys. (IF 5.4) Pub Date : 2024-06-26 Thomas Pfeil, Til Birnstiel, Hubert Klahr
Context. Gas in protoplanetary disks mostly cools via thermal accommodation with dust particles. Thermal relaxation is thus highly sensitive to the local dust size distributions and the spatial distribution of the grains. So far, the interplay between thermal relaxation and gas turbulence has not been dynamically modeled in hydrodynamic simulations of protoplanetary disks with dust.Aims. We aim to
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First very long baseline interferometry detection of Fornax A Astron. Astrophys. (IF 5.4) Pub Date : 2024-06-26 G. F. Paraschos, M. Wielgus, P. Benke, V. Mpisketzis, F. Rösch, K. Dasyra, E. Ros, M. Kadler, R. Ojha, P. G. Edwards, L. Hyland, J. F. H. Quick, S. Weston
Radio galaxies harbouring jetted active galactic nuclei are a frequent target of very long baseline interferometry (VLBI) because they play an essential role in our exploration of how jets form and propagate. Hence, only a few have not yet been detected with VLBI; Fornax A was one of the most famous examples. Here we present the first detection of the compact core region of Fornax A with VLBI. At 8
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The unexpected role of heliospheric boundaries in facilitating interstellar dust penetration at 1–5 AU Astron. Astrophys. (IF 5.4) Pub Date : 2024-06-25 E. A. Godenko, V. V. Izmodenov
Aims. Interstellar dust (ISD) particles penetrate the heliosphere because of the relative motion of the local interstellar cloud and the Sun. The penetrated particles pass through the heliospheric interface, that is, the region in which solar wind and interstellar plasma interact. As a result, the ISD flow is modified after the passage through this region under the influence of electromagnetic force
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The 33 M⊙ black hole Gaia BH3 is part of the disrupted ED-2 star cluster Astron. Astrophys. (IF 5.4) Pub Date : 2024-06-25 E. Balbinot, E. Dodd, T. Matsuno, C. Lardo, A. Helmi, P. Panuzzo, T. Mazeh, B. Holl, E. Caffau, A. Jorissen, C. Babusiaux, P. Gavras, Ł. Wyrzykowski, L. Eyer, N. Leclerc, A. Bombrun, N. Mowlavi, G. M. Seabroke, I. Cabrera-Ziri, T. M. Callingham, T. Ruiz-Lara, E. Starkenburg
Context. The Gaia Collaboration has recently reported the detection of a 33 M⊙ black hole in a wide binary system located in the solar neighbourhood.Aims. Here we explore the relationship between this black hole, known as Gaia BH3, and the nearby ED-2 halo stellar stream.Methods. We studied the orbital characteristics of the Gaia BH3 binary and present measurements of the chemical abundances of ED-2
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HD 110067 c has an aligned orbit Astron. Astrophys. (IF 5.4) Pub Date : 2024-06-24 J. Zak, H. M. J. Boffin, E. Sedaghati, A. Bocchieri, Q. Changeat, A. Fukui, A. Hatzes, T. Hillwig, K. Hornoch, D. Itrich, V. D. Ivanov, D. Jones, P. Kabath, Y. Kawai, L. V. Mugnai, F. Murgas, N. Narita, E. Palle, E. Pascale, P. Pravec, S. Redfield, G. Roccetti, M. Roth, J. Srba, Q. Tian, A. Tsiaras, D. Turrini, J. P. Vignes
Planetary systems in mean motion resonances hold a special place among the planetary population. They allow us to study planet formation in great detail as dissipative processes are thought to have played an important role in their existence. Additionally, planetary masses in bright resonant systems can be independently measured via both radial velocities and transit timing variations. In principle
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Eight new 2+2 doubly eclipsing quadruple systems detected Astron. Astrophys. (IF 5.4) Pub Date : 2024-06-24 P. Zasche, Z. Henzl, J. Merc, J. Kára, H. Kučáková
We studied eight new doubly eclipsing stellar systems. We found that they are all rare examples of quadruple systems of 2 + 2 architecture, where both inner pairs are eclipsing binaries. Until now, such a configuration had only been proven for dozens of systems on the whole sky. We enlarged this rare group of systems with four stars in the Small Magellanic Cloud (SMC) galaxy and four brighter stars
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MINCE Astron. Astrophys. (IF 5.4) Pub Date : 2024-06-21 P. François, G. Cescutti, P. Bonifacio, E. Caffau, L. Monaco, M. Steffen, J. Puschnig, F. Calura, S. Cristallo, P. Di Marcantonio, V. Dobrovolskas, M. Franchini, A. J. Gallagher, C. J. Hansen, A. Korn, A. Kučinskas, R. Lallement, L. Lombardo, F. Lucertini, L. Magrini, A. M. Matas Pinto, F. Matteucci, A. Mucciarelli, L. Sbordone, M. Spite, E. Spitoni, M. Valentini
Context. Most of the studies on the determination of the chemical composition of metal-poor stars have been focused on the search of the most pristine stars, searching for the imprints of the ejecta of the first supernovae. Apart from the rare and very interesting r-enriched stars, few elements are measurable in the very metal-poor stars. On the other hand, a lot of work has been done also on the thin-disc
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Mind the gap: Distinguishing disc substructures and their impact on the inner disc composition Astron. Astrophys. (IF 5.4) Pub Date : 2024-06-21 Jingyi Mah, Sofia Savvidou, Bertram Bitsch
Improved observational technologies have enabled the resolution of substructures and the measurement of chemical abundances in protoplanetary discs. Understanding the chemical composition of the inner disc allows us to infer the building blocks available for planet formation. Recently, the depletion of water in the inner disc has been suggested to be linked to the presence of substructures, such as
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Magnetic braking below the cataclysmic variable period gap and the observed dearth of period bouncers Astron. Astrophys. (IF 5.4) Pub Date : 2024-06-21 Arnab Sarkar, Antonio C. Rodriguez, Sivan Ginzburg, Lev Yungelson, Christopher A. Tout
Context. Period bouncers are cataclysmic variables (CVs) that have evolved past their orbital period minimum. The strong disagreement between theory and observations of the relative fraction of period bouncers is a severe shortcoming in the understanding of CV evolution.Aims. We test the implications of the hypothesis that magnetic braking (MB), which is suggested to be an additional angular momentum
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HIP 41378 observed by CHEOPS: Where is planet d?⋆⋆⋆ Astron. Astrophys. (IF 5.4) Pub Date : 2024-06-21 S. Sulis, L. Borsato, S. Grouffal, H. P. Osborn, A. Santerne, A. Brandeker, M. N. Günther, A. Heitzmann, M. Lendl, M. Fridlund, D. Gandolfi, Y. Alibert, R. Alonso, T. Bárczy, D. Barrado Navascues, S. C. C. Barros, W. Baumjohann, T. Beck, W. Benz, M. Bergomi, N. Billot, A. Bonfanti, C. Broeg, A. Collier Cameron, C. Corral van Damme, A. C. M. Correia, Sz. Csizmadia, P. E. Cubillos, M. B. Davies, M. Deleuil
HIP 41378 d is a long-period planet that has only been observed to transit twice, three years apart, with K2. According to stability considerations and a partial detection of the Rossiter–McLaughlin effect, Pd = 278.36 d has been determined to be the most likely orbital period. We targeted HIP 41378 d with CHEOPS at the predicted transit timing based on Pd = 278.36 d, but the observations show no transit
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Energy estimation of small-scale jets from the quiet-Sun region⋆ Astron. Astrophys. (IF 5.4) Pub Date : 2024-06-19 Fanpeng Shi, Dong Li, Zongjun Ning, Jun Xu, Yuxiang Song, Yuzhi Yang
Context. Solar jets play a role in coronal heating and the supply of solar wind.Aims. In this study, we calculate the energies of 23 small-scale jets emerging from a quiet-Sun region in order to investigate their contributions to coronal heating.Methods. We used data from the High-Resolution Imager (HRI) of the Extreme Ultraviolet Imager (EUI) on board the Solar Orbiter. Small-scale jets were observed
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QUIJOTE discovery of the cation radicals HC5N+ and HC7N+⋆ Astron. Astrophys. (IF 5.4) Pub Date : 2024-06-17 J. Cernicharo, C. Cabezas, M. Agúndez, Y. Endo, B. Tercero, N. Marcelino, P. de Vicente
We present the discovery with the QUIJOTE line survey of the cations HC5N+ and HC7N+ in the direction of TMC-1. Seven lines with half-integer quantum numbers from J = 25/2–23/2 to 37/2–35/2 have been assigned to HC5N+ and eight lines from J = 55/2–53/2 to 71/2–69/2 to HC7N+. Both species have inverted 2Π ground electronic states with very good estimates for their B0 and ASO constants based on optical
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Galaxy cluster virial-shock sources in eROSITA catalogs Astron. Astrophys. (IF 5.4) Pub Date : 2024-06-17 Gideon Ilani, Kuan-Chou Hou, Gil Nadler, Uri Keshet
Context. Virial shocks around galaxy clusters and groups are being mapped, thus tracing accretion onto large-scale structure.Aims. Following the recent identification of discrete ROSAT and radio sources associated with the virial shocks of MCXC clusters and groups, we examined the eROSITA-DE Early Data Release (EDR) to see whether it shows virial-shock X-ray sources within its 140 deg2 field.Methods
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Fast formation of large ice pebbles after FU Orionis outbursts Astron. Astrophys. (IF 5.4) Pub Date : 2024-06-17 Katrin Ros, Anders Johansen
During their formation, nascent planetary systems are subject to FU Orionis outbursts that heat a substantial part of the disc. This causes water ice in the affected part of the disc to sublimate as the ice line moves outwards to several to tens of astronomical units. In this paper, we investigate how the subsequent cooling of the disc impacts the particle sizes. We calculate the resulting particle
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Star-by-star dynamical evolution of the physical pair of the Collinder 135 and UBC 7 open clusters⋆ Astron. Astrophys. (IF 5.4) Pub Date : 2024-06-14 Maryna Ishchenko, Dana A. Kovaleva, Peter Berczik, Nina V. Kharchenko, Anatoly E. Piskunov, Evgeny Polyachenko, Ekaterina Postnikova, Andreas Just, Olga Borodina, Chingis Omarov, Olexandr Sobodar
Context. In a previous paper using Gaia DR2 data, we demonstrated that the two closely situated open clusters Collinder 135 and UBC 7 might have formed together about 50 Myr ago.Aims. In this work, we performed star-by-star dynamical modelling of the evolution of the open clusters Collinder 135 and UBC 7 from their supposed initial state to their present-day state, reproducing observational distributions
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Candidate young stellar objects in the S-cluster: Kinematic analysis of a subpopulation of the low-mass G objects close to Sgr A* Astron. Astrophys. (IF 5.4) Pub Date : 2024-06-14 F. Peißker, M. Zajaček, M. Melamed, B. Ali, M. Singhal, T. Dassel, A. Eckart, V. Karas
Context. The observation of several L-band emission sources in the S cluster has led to a rich discussion of their nature. However, a definitive answer to the classification of the dusty objects requires an explanation for the detection of compact Doppler-shifted Brγ emission. The ionized hydrogen in combination with the observation of mid-infrared L-band continuum emission suggests that most of these
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Resonance coupling in spiral arms Astron. Astrophys. (IF 5.4) Pub Date : 2024-06-14 Alexander A. Marchuk
Context. To address questions about the physical nature and origin of spiral arms in galaxies, it is necessary to measure their dynamical properties, such as the angular speed, Ωp, or the corotation radius. Observations suggest that galaxies may contain several independent spiral patterns simultaneously. It was shown that so-called non-linear resonance coupling plays an important role in such systems
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The SRG/eROSITA All-Sky Survey Astron. Astrophys. (IF 5.4) Pub Date : 2024-06-12 R. Seppi, J. Comparat, V. Ghirardini, C. Garrel, E. Artis, A. G. Sánchez, A. Liu, N. Clerc, E. Bulbul, S. Grandis, M. Kluge, T. H. Reiprich, A. Merloni, X. Zhang, Y. E. Bahar, S. Shreeram, J. Sanders, M. Ramos-Ceja, M. Krumpe
Context. The spatial distribution of galaxy clusters provides a reliable tracer of the large-scale distribution of matter in the Universe. The clustering signal depends on intrinsic cluster properties and cosmological parameters.Aims. The ability of eROSITA on board Spectrum-Roentgen-Gamma (SRG) to discover galaxy clusters allows the association of extended X-ray emission with dark matter haloes to
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The fifth data release of the Kilo Degree Survey: Multi-epoch optical/NIR imaging covering wide and legacy-calibration fields Astron. Astrophys. (IF 5.4) Pub Date : 2024-06-12 Angus H. Wright, Konrad Kuijken, Hendrik Hildebrandt, Mario Radovich, Maciej Bilicki, Andrej Dvornik, Fedor Getman, Catherine Heymans, Henk Hoekstra, Shun-Sheng Li, Lance Miller, Nicola R. Napolitano, Qianli Xia, Marika Asgari, Massimo Brescia, Hugo Buddelmeijer, Pierre Burger, Gianluca Castignani, Stefano Cavuoti, Jelte de Jong, Alastair Edge, Benjamin Giblin, Carlo Giocoli, Joachim Harnois-Déraps
We present the final data release of the Kilo-Degree Survey (KiDS-DR5), a public European Southern Observatory (ESO) wide-field imaging survey optimised for weak gravitational lensing studies. We combined matched-depth multi-wavelength observations from the VLT Survey Telescope and the VISTA Kilo-degree INfrared Galaxy (VIKING) survey to create a nine-band optical-to-near-infrared survey spanning 1347
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Recovery of the X-ray polarisation of Swift J1727.8−1613 after the soft-to-hard spectral transition Astron. Astrophys. (IF 5.4) Pub Date : 2024-06-12 J. Podgorný, J. Svoboda, M. Dovčiak, A. Veledina, J. Poutanen, P. Kaaret, S. Bianchi, A. Ingram, F. Capitanio, S. R. Datta, E. Egron, H. Krawczynski, G. Matt, F. Muleri, P.-O. Petrucci, T. D. Russell, J. F. Steiner, N. Bollemeijer, M. Brigitte, N. Castro Segura, R. Emami, J. A. García, K. Hu, M. N. Iacolina, V. Kravtsov, L. Marra, G. Mastroserio, T. Muñoz-Darias, E. Nathan, M. Negro, A. Ratheesh, N
We report on the detection of X-ray polarisation in the black-hole X-ray binary Swift J1727.8−1613 during its dim hard spectral state by the Imaging X-ray Polarimetry Explorer (IXPE). This is the first detection of X-ray polarisation at the transition from the soft to the hard state in an X-ray binary. We find an averaged 2–8 keV polarisation degree of (3.3 ± 0.4)% and a corresponding polarisation
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FAUST Astron. Astrophys. (IF 5.4) Pub Date : 2024-06-12 M. De Simone, L. Podio, L. Chahine, C. Codella, C. J. Chandler, C. Ceccarelli, A. López-Sepulcre, L. Loinard, B. Svoboda, N. Sakai, D. Johnstone, F. Ménard, Y. Aikawa, M. Bouvier, G. Sabatini, A. Miotello, C. Vastel, N. Cuello, E. Bianchi, P. Caselli, E. Caux, T. Hanawa, E. Herbst, D. Segura-Cox, Z. Zhang, S. Yamamoto
Context. Understanding the connection between outflows, winds, accretion, and discs in the inner protostellar regions is crucial for comprehending star and planet formation processes.Aims. We aim to we explore the inner 300 au of the protostar IRAS 4A2 as part of the ALMA FAUST Large Program.Methods. We analysed the kinematical structures of SiO and CH3OH emission with 50 au resolution.Results. The
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The Milky Way atlas for linear filaments Astron. Astrophys. (IF 5.4) Pub Date : 2024-06-07 Ke Wang, Yifei Ge, Tapas Baug
Context. Filamentary structure is important for the ISM and star formation. Galactic distribution of filaments may regulate the star formation rate in the Milky Way. However, interstellar filaments are intrinsically complex, making them difficult to study quantitatively.Aims. Here we focus on linear filaments, the simplest morphology that can be treated as building blocks of any filamentary structure
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Simulation-based inference with neural posterior estimation applied to X-ray spectral fitting Astron. Astrophys. (IF 5.4) Pub Date : 2024-06-06 Didier Barret, Simon Dupourqué
Context. Neural networks are being extensively used for modeling data, especially in the case where no likelihood can be formulated.Aims. Although in the case of X-ray spectral fitting the likelihood is known, we aim to investigate the ability of neural networks to recover the model parameters and their associated uncertainties and to compare their performances with standard X-ray spectral fitting
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High-cadence monitoring of the emission properties of magnetar XTE J1810−197 with the Stockert radio telescope⋆⋆⋆ Astron. Astrophys. (IF 5.4) Pub Date : 2024-06-05 Marlon L. Bause, Wolfgang Herrmann, Laura G. Spitler
Context. Since the detection of a burst resembling a fast radio burst (FRB) from the Galactic magnetar SGR 1935+2154, magnetars have joined the set of favourable candidates for FRB progenitors. However, the emission mechanism of magnetars remains poorly understood.Aims. Observations of magnetars with a high cadence over extended timescales have allowed for their emission properties to be determined
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MATRICS: The implicit matrix-free Eulerian hydrodynamics solver Astron. Astrophys. (IF 5.4) Pub Date : 2024-06-04 Johannes Meyer, Julio David Melon Fuksman, Hubert Klahr
Context. There exists a zoo of different astrophysical fluid dynamics solvers, most of which are based on an explicit formulation and hence stability-limited to small time steps dictated by the Courant number expressing the local speed of sound. With this limitation, the modeling of low-Mach-number flows requires small time steps that introduce significant numerical diffusion, and a large amount of
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Mass and wind luminosity of young Galactic open clusters in Gaia DR2⋆ Astron. Astrophys. (IF 5.4) Pub Date : 2024-06-04 S. Celli, A. Specovius, S. Menchiari, A. Mitchell, G. Morlino
Context. Star clusters constitute a significant part of the stellar population in our Galaxy. The feedback processes they exert on the interstellar medium impact multiple physical processes from the chemical to the dynamical evolution of the Galaxy. In addition, young and massive stellar clusters might act as efficient particle accelerators and contribute to the production of cosmic rays.Aims. We aim
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Hot subdwarfs in close binaries observed from space Astron. Astrophys. (IF 5.4) Pub Date : 2024-06-04 B. N. Barlow, T. Kupfer, B. A. Smith, V. Schaffenroth, I. Parker
Detailed studies of hot subdwarf B (sdB) stars with red dwarf (dM) or brown dwarf (BD) companions can shed light on the effects of binarity on late stellar evolution. Such systems exhibit a strong, quasi-sinusoidal reflection effect due to irradiation of the cool companion, and some even show primary and secondary eclipses. For this work, we computed Fourier transforms of TESS light curves of sdB+dM/BD
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Proton polytropic behavior of periodic density structures in the solar wind Astron. Astrophys. (IF 5.4) Pub Date : 2024-06-04 C. Katsavrias, G. Nicolaou, S. Di Matteo, L. Kepko, N. M. Viall, S. Aminalragia-Giamini, G. Livadiotis
Context. In recent years, mesoscales have gained scientific interest because they have been determined to be important in a broad range of phenomena throughout heliophysics. The solar wind mesoscale structures include periodic density structures (PDSs), which are quasi-periodic increases in the density of the solar wind that range from a few minutes to a few hours. These structures have been extensively
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The γ-process nucleosynthesis in core-collapse supernovae Astron. Astrophys. (IF 5.4) Pub Date : 2024-05-31 L. Roberti, M. Pignatari, C. Fryer, M. Lugaro
Context. The γ process in core-collapse supernovae (CCSNe) can produce a number of neutron-deficient stable isotopes heavier than iron (p nuclei). However, current model predictions do not fully reproduce solar abundances, especially for 92, 94Mo and 96, 98Ru.Aims. We investigate the impact of different explosion energies and parametrizations on the nucleosynthesis of p nuclei, by studying stellar
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NeuralCMS: A deep learning approach to study Jupiter’s interior Astron. Astrophys. (IF 5.4) Pub Date : 2024-05-30 M. Ziv, E. Galanti, A. Sheffer, S. Howard, T. Guillot, Y. Kaspi
Context. NASA’s Juno mission provided exquisite measurements of Jupiter’s gravity field that together with the Galileo entry probe atmospheric measurements constrains the interior structure of the giant planet. Inferring its interior structure range remains a challenging inverse problem requiring a computationally intensive search of combinations of various planetary properties, such as the cloud-level
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Angular momentum transport via gravitational instability in the Elias 2–27 disc Astron. Astrophys. (IF 5.4) Pub Date : 2024-05-28 C. Longarini, G. Lodato, C. J. Clarke, J. Speedie, T. Paneque-Carreño, E. Arrigoni, P. Curone, C. Toci, C. Hall
Gravitational instability is thought to be one of the main drivers of angular momentum transport in young protoplanetary discs. The disc around Elias 2−27 offers a unique example of gravitational instability at work. It is young and massive, displaying two prominent spiral arms in dust continuum emission and global non-axisymmetric kinematic signatures in molecular line data. In this work, we used
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Laboratory and astronomical discovery of cyanothioketene, NCCHCS, in the cold starless core TMC-1⋆⋆⋆ Astron. Astrophys. (IF 5.4) Pub Date : 2024-05-27 C. Cabezas, M. Agúndez, Y. Endo, B. Tercero, Y.-P. Lee, N. Marcelino, P. de Vicente, J. Cernicharo
We present the detection of cyanothioketene, NCCHCS, in the laboratory and toward TMC-1. This transient species was produced through a discharge of a gas mixture of CH2CHCN and CS2 using argon as carrier gas, and its rotational spectrum between 9 and 40 GHz was characterized using a Balle-Flygare narrowband-type Fourier-transform microwave spectrometer. A total of 21 rotational transitions were detected
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Detection of extragalactic magnetic massive stars Astron. Astrophys. (IF 5.4) Pub Date : 2024-05-27 S. Hubrig, M. Schöller, S. P. Järvinen, A. Cikota, M. Abdul-Masih, A. Escorza, R. Jayaraman
Context. Studies of the magnetic characteristics of massive stars have recently received significant attention because they are progenitors of highly magnetised compact objects. Stars initially more massive than about 8 M⊙ leave behind neutron stars and black holes by the end of their evolution. The merging of binary compact remnant systems produces astrophysical transients detectable by gravitational
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Evidence of a toroidal magnetic field in the core of 3C 84 Astron. Astrophys. (IF 5.4) Pub Date : 2024-05-27 G. F. Paraschos, L. C. Debbrecht, J. A. Kramer, E. Traianou, I. Liodakis, T. P. Krichbaum, J.-Y. Kim, M. Janssen, D. G. Nair, T. Savolainen, E. Ros, U. Bach, J. A. Hodgson, M. Lisakov, N. R. MacDonald, J. A. Zensus
The spatial scales of relativistic radio jets, probed by relativistic magneto-hydrodynamic (RMHD) jet launching simulations and by most very long baseline interferometry (VLBI) observations differ by an order of magnitude. Bridging the gap between these RMHD simulations and VLBI observations requires selecting nearby active galactic nuclei (AGN), the parsec-scale region of which can be resolved. The
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Expected performance of the Pyramid wavefront sensor with a laser guide star for 40 m class telescopes Astron. Astrophys. (IF 5.4) Pub Date : 2024-05-24 F. Oyarzún, V. Chambouleyron, B. Neichel, T. Fusco, A. Guesalaga
Context. The use of artificial laser guide stars (LGS) is planned for the new generation of giant segmented mirror telescopes in order to extend the sky coverage of their adaptive optics systems. The LGS, being a 3D object at a finite distance, will have a large elongation that will affect its use with the Shack–Hartmann (SH) wavefront sensor.Aims. In this paper, we compute the expected performance
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Gas, not dust: Migration of TESS/Gaia hot Jupiters possibly halted by the magnetospheres of protoplanetary disks Astron. Astrophys. (IF 5.4) Pub Date : 2024-05-24 I. Mendigutía, J. Lillo-Box, M. Vioque, J. Maldonado, B. Montesinos, N. Huélamo, J. Wang
Context. The presence of short-period (< 10 days) planets around main sequence (MS) stars has been associated either with the dust-destruction region or with the magnetospheric gas-truncation radius in the protoplanetary disks that surround them during the pre-MS phase. However, previous analyses have only considered low-mass FGK stars, making it difficult to disentangle the two scenarios.Aims. This
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The CO-dark molecular gas in the cold H I arc Astron. Astrophys. (IF 5.4) Pub Date : 2024-05-20 Gan Luo, Di Li, Zhi-Yu Zhang, Thomas G. Bisbas, Ningyu Tang, Lingrui Lin, Yichen Sun, Pei Zuo, Jing Zhou
i i narrow self-absorption (HINSA). This is the first detection of HINSA in the outer disk region, in which the HINSA fraction ($N_ HINSA $/$N_ H_2 $ = 0.022pm 0.011) is an order of magnitude higher than the average value observed in nearby evolved dark clouds, but is consistent with that of the early evolutionary stage of dark clouds. The inferred H$_2$ column density from both extinction and OH emission
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Extended high-ionization [Mg IV] emission tracing widespread shocks in starbursts seen by JWST/NIRSpec Astron. Astrophys. (IF 5.4) Pub Date : 2024-05-20 Miguel Pereira-Santaella, Ismael Garcia-Bernete, Eduardo Gonzalez-Alfonso, Almudena Alonso-Herrero, Luis Colina, Santiago Garcia-Burillo, Dimitra Rigopoulou, Santiago Arribas, Michele Perna
We report the detection of extended ($>$0.5--1\,kpc) high-ionization (80\,eV) emission in four local luminous infrared galaxies observed with JWST NIRSpec. Excluding the nucleus and outflow of the Type 1 active galactic nucleus (AGN) in the sample, we find that the luminosity is well correlated with that of H recombination lines, which mainly trace star-forming clumps in these objects, and that the
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Abell 0399–Abell 0401 radio bridge spectral index: First multi-frequency detection Astron. Astrophys. (IF 5.4) Pub Date : 2024-05-17 G. V. Pignataro, A. Bonafede, G. Bernardi, F. de Gasperin, G. Brunetti, T. Pasini, F. Vazza, N. Biava, J. M. G. H. J. de Jong, R. Cassano, A. Botteon, M. Brüggen, H. J. A. Röttgering, R. J. van Weeren, T. W. Shimwell
Aims. Recent low-frequency radio observations at 140 MHz discovered a bridge of diffuse emission with a length of 3 Mpc that connects the galaxy clusters Abell 0399 and Abell 0401. We present follow-up observations at 60 MHz to constrain the spectral index of the bridge, which has only been detected at 140 and 144 MHz so far.Methods. We analysed deep (∼18 h) LOw Frequency ARray (LOFAR) Low Band Antenna
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Magnetically driven relativistic jet in the high-redshift blazar OH 471 Astron. Astrophys. (IF 5.4) Pub Date : 2024-05-17 S. Guo, T. An, Y. Liu, Y. Sotnikova, A. Volvach, T. Mufakharov, L. Chen, L. Cui, A. Wang, Z. Xu, Y. Zhang, W. Xu, Y. A. Kovalev, Y. Y. Kovalev, M. Kharinov, A. Erkenov, T. Semenova, L. Volvach
Context. Understanding the mechanisms that launch and shape powerful relativistic jets from supermassive black holes (SMBHs) in high-redshift active galactic nuclei (AGNs) is crucial for probing the co-evolution of SMBHs and galaxies over cosmic time.Aims. We focus on the high-redshift (z = 3.396) blazar OH 471 to explore the jet launching mechanism in the early Universe.Methods. Using multi-frequency
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The SRG/eROSITA All-Sky Survey Astron. Astrophys. (IF 5.4) Pub Date : 2024-05-15 E. Bulbul, A. Liu, M. Kluge, X. Zhang, J. S. Sanders, Y. E. Bahar, V. Ghirardini, E. Artis, R. Seppi, C. Garrel, M. E. Ramos-Ceja, J. Comparat, F. Balzer, K. Böckmann, M. Brüggen, N. Clerc, K. Dennerl, K. Dolag, M. Freyberg, S. Grandis, D. Gruen, F. Kleinebreil, S. Krippendorf, G. Lamer, A. Merloni, K. Migkas, K. Nandra, F. Pacaud, P. Predehl, T. H. Reiprich, T. Schrabback, A. Veronica, J. Weller,
Clusters of galaxies can be used as powerful probes to study astrophysical processes on large scales, test theories of the growth of structure, and constrain cosmological models. The driving science goal of the SRG/eROSITA All-Sky Survey is to assemble a large sample of X-ray clusters with a well-defined selection function to determine the evolution of the mass function and, hence, the cosmological
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Euclid preparation Astron. Astrophys. (IF 5.4) Pub Date : 2024-05-14 T. Castro, S. Borgani, M. Costanzi, J. Dakin, K. Dolag, A. Fumagalli, A. Ragagnin, A. Saro, A. M. C. Le Brun, N. Aghanim, A. Amara, S. Andreon, N. Auricchio, M. Baldi, S. Bardelli, C. Bodendorf, D. Bonino, E. Branchini, M. Brescia, J. Brinchmann, S. Camera, V. Capobianco, C. Carbone, J. Carretero, S. Casas, M. Castellano, S. Cavuoti, A. Cimatti, G. Congedo, C. J. Conselice, L. Conversi, Y. Copin, L
The Euclid photometric survey of galaxy clusters stands as a powerful cosmological tool, with the capacity to significantly propel our understanding of the Universe. Despite being subdominant to dark matter and dark energy, the baryonic component of our Universe holds substantial influence over the structure and mass of galaxy clusters. This paper presents a novel model that can be used to precisely
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The population of young low-mass stars in Trumpler 14⋆⋆⋆ Astron. Astrophys. (IF 5.4) Pub Date : 2024-05-14 Dominika Itrich, Leonardo Testi, Giacomo Beccari, Carlo F. Manara, Megan Reiter, Thomas Preibisch, Anna F. McLeod, Giovanni Rosotti, Ralf Klessen, Sergio Molinari, Patrick Hennebelle
Massive star-forming regions are thought to be the most common birth environments in the Galaxy and the only birth places of very massive stars. Their presence in the stellar cluster alters the conditions within the cluster, impacting at the same time the evolution of other cluster members. In principle, copious amounts of ultraviolet radiation produced by massive stars can remove material from outer
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Observations of scattered light from exoplanet atmospheres Astron. Astrophys. (IF 5.4) Pub Date : 2024-05-14 Brett M. Morris, Kevin Heng, Daniel Kitzmann
Optical phase curves of hot Jupiters can reveal global scattering properties. We implemented a Bayesian inference framework for optical phase curves with flux contributions from: reflected light from a potentially inhomogeneous atmosphere, thermal emission, ellipsoidal variations, Doppler beaming, and stellar rotation via a Gaussian process in the time domain. We probed for atmospheric homogeneity
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Structure formation with primordial black holes to alleviate early star formation tension revealed by JWST Astron. Astrophys. (IF 5.4) Pub Date : 2024-05-14 P. E. Colazo, F. Stasyszyn, N. Padilla
Context. This Letter explores the potential role of primordial black holes (PBHs) to address cosmological tensions as the presence of more massive than expected galaxies at high redshifts, as indicated by recent James Webb Space Telescope observations.Aims. Motivated by inflation models that enhance the power at scales beyond the observable range that produce PBHs with Schechter-like mass functions
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Astrometric detection of a Neptune-mass candidate planet in the nearest M-dwarf binary system GJ65 with VLTI/GRAVITY Astron. Astrophys. (IF 5.4) Pub Date : 2024-05-14 R. Abuter, A. Amorim, M. Benisty, J. P. Berger, H. Bonnet, G. Bourdarot, P. Bourget, W. Brandner, Y. Clénet, R. Davies, F. Delplancke-Ströbele, R. Dembet, A. Drescher, A. Eckart, F. Eisenhauer, H. Feuchtgruber, G. Finger, N. M. Förster Schreiber, P. Garcia, R. Garcia-Lopez, F. Gao, E. Gendron, R. Genzel, S. Gillessen, M. Hartl, X. Haubois, F. Haussmann, T. Henning, S. Hippler, M. Horrobin, L. Jochum
The detection of low-mass planets orbiting the nearest stars is a central stake of exoplanetary science, as they can be directly characterized much more easily than their distant counterparts. Here, we present the results of our long-term astrometric observations of the nearest binary M-dwarf Gliese 65 AB (GJ65), located at a distance of only 2.67 pc. We monitored the relative astrometry of the two
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Discovery of a hot post-AGB star in Galactic globular cluster E3 Astron. Astrophys. (IF 5.4) Pub Date : 2024-05-08 R. Kumar, A. Moharana, S. Piridi, A. C. Pradhan, K. G. Hełminiak, N. Ikonnikova, A. Dodin, R. Szczerba, M. Giersz, D. K. Ojha, M. R. Samal
We report a new hot post-asymptotic giant branch (PAGB) star in the Galactic globular cluster (GC) E3, which is one of the first of the identified PAGB stars in a GC to show a binary signature. The star stands out as the brightest source in E3 in the Astrosat/UVIT images. We confirmed its membership with the cluster E3 using Gaia DR3 kinematics and parallax measurements. We supplemented the photometric
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Reduction of dust radial drift by turbulence in protoplanetary disks Astron. Astrophys. (IF 5.4) Pub Date : 2024-05-06 Fabiola Antonietta Gerosa, Jérémie Bec, Héloïse Méheut, Anand Utsav Kapoor
Context. Dust particles in protoplanetary disks rotate at velocities exceeding those of the surrounding gas due to a lack of pressure support. Consequently, they experience a headwind from the gas that drives them toward the central star. Radial drift occurs on timescales much shorter than those inferred from disk observations or those required for dust to aggregate and form planets. Additionally,
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Spectroscopic evidence of a possible young stellar cluster at the Galactic Center Astron. Astrophys. (IF 5.4) Pub Date : 2024-05-07 A. Martínez-Arranz, R. Schödel, F. Nogueras-Lara, F. Najarro, R. Castellanos, R. Fedriani
Context. The nuclear stellar disk has been the most prolific star-forming region in the Milky Way over the past ∼30 million years. Notably, the cumulative mass of the three clusters currently found in the nuclear stellar disk, the Quintuplet, the Arches, and the Nuclear clusters, amounts to just 10% of the total anticipated mass of young stars that formed in this period. This discrepancy, known as
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First image of a jet launching from a black hole accretion system: Kinematics Astron. Astrophys. (IF 5.4) Pub Date : 2024-05-06 B. Punsly
Jets are endemic to both Galactic solar mass and extragalactic supermassive black holes. A recent 86 GHz image of M 87 shows a jet emerging from the accretion ring around a black hole, providing the first direct observational constraint on the kinematics of the jet-launching region in any black hole jetted system. The very wide (∼280 μas), highly collimated, limb-brightened cylindrical jet base is
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Unveiling very young O stars Astron. Astrophys. (IF 5.4) Pub Date : 2024-05-07 A. Roman-Lopes
Context. O-type stars are known to significantly contribute to both the dynamics and evolution of galaxies. Massive and luminous, they probably control and regulate the galaxies star formation rates. The stellar feedback generated by such cosmic beasts can strongly affect the local star formation rate, with effects in the current (and future) generations of low and intermediate mass stars, and possibly
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The galaxy group merger origin of the Cloverleaf odd radio circle system Astron. Astrophys. (IF 5.4) Pub Date : 2024-04-30 E. Bulbul, X. Zhang, M. Kluge, M. Brüggen, B. Koribalski, A. Liu, E. Artis, Y. E. Bahar, F. Balzer, C. Garrel, V. Ghirardini, N. Malavasi, A. Merloni, K. Nandra, M. E. Ramos-Ceja, J. S. Sanders, S. Zelmer
Odd radio circles (ORCs) are a newly discovered class of extended faint radio sources of unknown origin. We report the first detection of diffuse X-ray gas at the location of a low-redshift ORC (z = 0.046) known as Cloverleaf ORC. This observation was performed with the XMM-Newton X-ray telescope. The physical extent of the diffuse X-ray emission corresponds to a region of approximately 230 kpc by
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MINDS: JWST/NIRCam imaging of the protoplanetary disk PDS 70 Astron. Astrophys. (IF 5.4) Pub Date : 2024-04-30 V. Christiaens, M. Samland, Th. Henning, B. Portilla-Revelo, G. Perotti, E. Matthews, O. Absil, L. Decin, I. Kamp, A. Boccaletti, B. Tabone, G.-D. Marleau, E. F. van Dishoeck, M. Güdel, P.-O. Lagage, D. Barrado, A. Caratti o Garatti, A. M. Glauser, G. Olofsson, T. P. Ray, S. Scheithauer, B. Vandenbussche, L. B. F. M. Waters, A. M. Arabhavi, S. L. Grant, H. Jang, J. Kanwar, J. Schreiber, K. Schwarz
Context. Two protoplanets have recently been discovered within the PDS 70 protoplanetary disk. JWST/NIRCam offers a unique opportunity to characterize them and their birth environment at wavelengths that are difficult to access from the ground.Aims. We image the circumstellar environment of PDS 70 at 1.87 μm and 4.83 μm, assess the presence of Pa-α emission due to accretion onto the protoplanets, and
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Addition of the Local Volume sample of galaxies from the FAST HI survey Astron. Astrophys. (IF 5.4) Pub Date : 2024-04-25 Igor D. Karachentsev, Valentina E. Karachentseva, Serafim S. Kaisin, Chuan-Peng Zhang
We report the discovery of 20 new dwarf galaxies in the Local Volume identified as optical counterparts to the Five-hundred-meter Aperture Spherical radio Telescope (FAST) All Sky HI Survey (FASHI) sources. The galaxies have a median stellar mass of 7.8 × 106 M⊙ and a median HI mass of 1.0 × 107 M⊙. Most of them are field galaxies, while three are probable members of the M 101 and M 106 groups. We
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Cosmography with supernova Refsdal through time-delay cluster lensing: Independent measurements of the Hubble constant and geometry of the Universe Astron. Astrophys. (IF 5.4) Pub Date : 2024-04-24 C. Grillo, L. Pagano, P. Rosati, S H. Suyu
We present new measurements of the values of the Hubble constant, matter density, dark energy density, and dark energy density equation-of-state (EoS) parameters. These results have been obtained from a full strong-lensing analysis of the observed positions of 89 multiple images and 4 measured time delays of the supernova (SN) Refsdal in the Hubble Frontier Fields galaxy cluster MACS J1149.5+2223.