We report the discovery of a close binary J0606+2132 (Gaia DR3 3423365496448406272) with Pobs = 2.77 days containing a possible massive white dwarf (WD) or a neutron star (NS) using LAMOST spectroscopic data. By a joint fitting of the radial velocity from LAMOST and the light curve from TESS, we derived a circular Keplerian orbit with an inclination of i = 81.°31 , which is consistent with that derived from . Together with the mass of the visible star, we derived the mass of the invisible object to be . Spectral disentangling with the LAMOST medium-resolution spectra shows no absorption feature from an additional component, suggesting the presence of a compact object. No X-ray or radio pulsed signal is detected from ROSAT and FAST archive observations. J0606+2132 could evolve into either a Type Ia supernova or an NS through accretion-induced collapse if it is a WD or into an intermediate-mass X-ray binary if it is an NS.

中文翻译：

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LAMOST发现的大质量白矮星或低质量中子星


我们利用LAMOST的光谱数据报告了一颗接近双星J0606+2132（Gaia DR3 3423365496448406272），Pobs = 2.77天，其中可能包含一颗大质量白矮星（WD）或一颗中子星（NS）。通过对LAMOST的视向速度和TESS的光曲线的联合拟合，我们得到了一个倾角为i = 81.°31 的圆形开普勒轨道，这与由此得出的一致。连同可见恒星的质量，我们推导出不可见物体的质量为 。与LAMOST中分辨率光谱的光谱解开显示没有来自附加分量的吸收特征，这表明存在一个致密的天体。从 ROSAT 和 FAST 档案观测中没有检测到 X 射线或无线电脉冲信号。J0606+2132 如果是 WD，则可以通过吸积诱导的坍缩演变成 Ia 型超新星或 NS，如果它是 NS，则演变成中等质量的 X 射线双星。