论文标题
最接近的极低质量白矮人与阳光
The closest extremely low-mass white dwarf to the Sun
论文作者
论文摘要
我们介绍了2MASS J050051.85-093054.9的轨道和特性，将其确定为最接近的（D〜71 PC）极低的质量白色矮人。我们发现，该恒星具有富含氢的氢，teff〜10 500 k，log g〜5.9，并且随着进化模型的质量约为0.17太阳能。径向速度和苔丝光度法时间序列的独立分析显示，轨道周期约为9.5 h。它的高速度振幅（K〜144 km/s）在苔丝光曲线中产生可测量的多普勒光束效应，幅度为1 mmmag。看不见的同伴很可能是一个微弱的白色矮人。 J0500-0930属于一类公共信封系统，这些系统很可能通过不稳定的传质合并，在特定情况下会导致IA类型超新星爆炸。
We present the orbit and properties of 2MASS J050051.85-093054.9, establishing it as the closest (d ~ 71 pc) extremely low mass white dwarf to the Sun. We find that this star is hydrogen-rich with Teff ~ 10 500 K, log g ~ 5.9, and, following evolutionary models, has a mass of ~ 0.17 solar masses. Independent analysis of radial velocity and TESS photometric time series reveals an orbital period of ~ 9.5 h. Its high velocity amplitude (K ~ 144 km/s) produces a measurable Doppler beaming effect in the TESS light curve with an amplitude of 1 mmag. The unseen companion is most likely a faint white dwarf. J0500-0930 belongs to a class of post-common envelope systems that will most likely merge through unstable mass transfer and in specific circumstances lead to Type Ia supernova explosions.
