论文标题
动态发现和表征的非精神中的中子星 - m矮人二进制候选者
A dynamically discovered and characterized non-accreting neutron star -- M dwarf binary candidate
论文作者
论文摘要
光学时域调查可以揭幕并表征令人兴奋但较少探索的非胶合和/或二进制中的非束中子星（NS）。在这里，我们报告了使用Lamost光谱调查发现此类NS候选者的发现。该候选人被指定为Lamost J112306.9+400736（以下简称J1123），位于单衬的光谱二进制中，其中包含光学上可见的M星。该恒星的大径向速度变化和椭圆形变化表明相对较大的看不见的伴侣。利用帕洛马尔200英寸望远镜的后续光谱和苔丝的高精度光度法，我们的伴随质量为$ 1.24 _ { - 0.03}^{+0.03} 〜m _ {\ odot} $。排除了带有该质量的主要恒星，留下了NS或巨大的白色矮人（WD）。尽管不能排除大规模的WD，但同伴缺乏紫外线过量辐射支持NS假设。具有快速的深度无线电观察结果无法检测到脉冲或持续发射。在许多X射线和伽马射线调查中未检测到J1123。这些非探测表明，NS候选人目前没有积聚和脉动。我们的工作体现了通过协同光学时域光谱和高振动光度计来发现非核对近亲二进制物中紧凑物体的能力。
Optical time-domain surveys can unveil and characterize exciting but less-explored non-accreting and/or non-beaming neutron stars (NS) in binaries. Here we report the discovery of such a NS candidate using the LAMOST spectroscopic survey. The candidate, designated LAMOST J112306.9+400736 (hereafter J1123), is in a single-lined spectroscopic binary containing an optically visible M star. The star's large radial velocity variation and ellipsoidal variations indicate a relatively massive unseen companion. Utilizing follow-up spectroscopy from the Palomar 200-inch telescope and high-precision photometry from TESS, we measure a companion mass of $1.24_{-0.03}^{+0.03}~M_{\odot}$. Main-sequence stars with this mass are ruled out, leaving a NS or a massive white dwarf (WD). Although a massive WD cannot be ruled out, the lack of UV excess radiation from the companion supports the NS hypothesis. Deep radio observations with FAST yielded no detections of either pulsed or persistent emission. J1123 is not detected in numerous X-ray and gamma-ray surveys. These non-detections suggest that the NS candidate is not presently accreting and pulsing. Our work exemplifies the capability of discovering compact objects in non-accreting close binaries by synergizing the optical time-domain spectroscopy and high-cadence photometry.
