论文标题
Ecumping common-Envelope二进制TIC 60040774的表征
Characterisation of the eclipsing post-common-envelope binary TIC 60040774
论文作者
论文摘要
具有白色矮小初级和主要序列的二进制文件可用于测试我们对单恒星进化的理解。一小部分此类系统经历了一个共同的阶段，它们从相对较短的轨道时期出现。在这里，我们介绍了这种黯淡的common-envelope二进制于TIC 60040774的表征，该二元基于过境外球星调查卫星（TESS）提供的光曲线，该卫星（TESS）是从虚拟观测值和光谱数据中获得的多波段光度测定，从而获得了南部非洲大型Telescope（Salt）。轨道周期为$ 0.404807 \ pm0.000149 $天，该系统由一个年轻的白色矮人和M6.5矮人配对组成。我们估计，初级和第二的质量为$ 0.598 \ pm0.029 $ m $ _ {\ odot} $和$ 0.107 \ pm0.020 $ m $ _ {\ odot} $，而有效的温度为$ 14050 \ pm360 $ k和$ 275959 \ pm50 \ k，相应地相应。 Eclipse Intress和Egress曲线比简单的几何模型预期的要浅，因此需要更精确的高振动光度法才能理解该系统的性质。鉴于TIC 60040774与GK Vir和Nn Ser等系统的相似性，值得跟踪其日食时间以检查一个或多个环形行星的存在。
Binaries with a white dwarf primary and a main sequence secondary can be used to test our understanding of both single and binary star evolution. A small fraction of such systems experienced a common-envelope phase from which they emerged with a relatively short orbital period. Here, we present the characterisation of an eclipsing post-common-envelope binary of this kind, TIC 60040774, based on the light curve provided by the Transiting Exoplanet Survey Satellite (TESS), multi-band photometry collated from the virtual observatory, and spectroscopic data obtained the Southern African Large Telescope (SALT). With an orbital period of $0.404807\pm0.000149$ days, this system consists of a young white dwarf paired with an M6.5 dwarf companion. We estimate the masses of the primary and secondary to be $0.598\pm0.029$ M$_{\odot}$ and $0.107\pm0.020$ M$_{\odot}$, while the effective temperatures are $14050\pm360$ K and $2759\pm50$ K, respectively. The eclipse ingress and egress profile is shallower than expected from a simple geometric model such that more precise high-cadence photometry is required to understand the nature of this system. Given the similarity of TIC 60040774 to systems like GK Vir and NN Ser, it will be worth tracking its eclipse times to check for the presence of one or more circumbinary planets.
