The recent discovery of planetesimals orbiting white dwarfs has renewed interest in the final chapters of the evolution of planetary systems. Although observational and theoretical studies have examined the dynamical evolution of these systems, studies of their magnetic star–planet interactions, as powered by unipolar induction, have thus far only been assessed theoretically. This fifth paper of the Radio Observations of Magnetized Exoplanets series presents the results of a targeted minisurvey of nine white dwarfs within 25 pc without known stellar mass companions in search of radio emissions generated by magnetic interactions between white dwarfs and their planetary remnants. This ∼5 GHz Arecibo radio telescope survey achieved mJy-level sensitivity over <1 s integration times. Although no exoplanet-induced stellar radio flares were detected, this is the first survey to search for magnetic star–planet interactions between white dwarfs and planetary companions, cores, or disrupted planetesimals. It is also the most extensive and sensitive radio survey for intrinsic coronal emissions from apparently isolated white dwarfs. The study of radio emissions from white dwarf systems may present a new means to detect and measure DC and DQ magnetic fields, search for white dwarf coronae, characterize the density and spatial distribution of white dwarf magnetospheric plasma, characterize the dynamical and electrical properties of planetary cores, and offer new constraints on the modeling of double-degenerate merger events.

中文翻译：

---

罗马的衰落。V. 在 25 pc 内白矮星中 5 GHz 处对恒星扰乱行星相互作用和日冕活动的初步搜索


最近发现的围绕白矮星运行的行星体重新引起了人们对行星系统演化最后几章的兴趣。尽管观测和理论研究已经检查了这些系统的动力学演化，但迄今为止，对它们在单极感应驱动的磁星-行星相互作用的研究仅从理论上进行评估。磁化系外行星的射电观测系列的第五篇论文介绍了对 25 pc 内没有已知恒星质量伴星的 9 颗白矮星进行有针对性的小型调查的结果，以寻找白矮星与其行星残骸之间的磁相互作用产生的无线电发射。这次 ∼5 GHz 阿雷西博射电望远镜巡天在 <1 s 积分时间内实现了 mJy 级灵敏度。虽然没有检测到系外行星引起的恒星射电耀斑，但这是第一次寻找白矮星与行星伴星、核心或被破坏的行星之间的磁星-行星相互作用的调查。这也是对明显孤立的白矮星的内禀日冕发射进行的最广泛和最敏感的射电巡天。对白矮星系统的无线电发射的研究可能提供一种新的方法来检测和测量直流和DQ磁场，寻找白矮星日冕，表征白矮星磁层等离子体的密度和空间分布，表征行星核心的动力学和电学特性，并为双简并合并事件的建模提供新的约束。