论文标题
NGTS J214358.5-380102-NGTS发现最古怪已知的Eceplips M-dwarf二进制系统
NGTS J214358.5-380102 -- NGTS discovery of the most eccentric known eclipsing M-Dwarf binary system
论文作者
论文摘要
我们介绍了NGTS J214358.5-380102的发现，这是一个由下一代公交调查发现的偏心M-warf二进制。 7.618天的系统周期大于许多已知的Eclips M-warf二进制系统。它的轨道偏心度为$ 0.323^{+0.0014} _ { - 0.0037} $，相对于二进制的时期和半轴轴很大。光度和径向速度的全球建模表示恒星质量为$ M_A $ = $ 0.426 ^{+0.0056} _ { - 0.0049} $，$ M_B $ = $ 0.455 ^{+0.0058} ^{+0.038} _ { - 0.025} $ $ r_b $ = $ 0.411 ^{+0.027} _ { - 0.039} $，分别。与低质量恒星的恒星模型的比较表明，一颗恒星与模型预测一致，而另一个恒星基本上大小过大。该系统的光谱分析表明，光谱型M3V的一级与建模质量和半径以及NGTS光度法的拟合一致。 NGTS J214358.5-380102是最古怪的M-dwarf二元二元二进制二元，为潮汐轨道圆形轨道化的强度提供了一个有趣的见解。
We present the discovery of NGTS J214358.5-380102, an eccentric M-dwarf binary discovered by the Next Generation Transit Survey. The system period of 7.618 days is greater than many known eclipsing M-dwarf binary systems. Its orbital eccentricity of $0.323^{+0.0014}_{-0.0037}$, is large relative to the period and semi-major axis of the binary. Global modelling of photometry and radial velocities indicate stellar masses of $M_A$=$0.426 ^{+0.0056}_{-0.0049}$, $M_B$=$0.455 ^{+0.0058}_{-0.0052}$ and stellar radii $R_A$=$0.461 ^{+0.038}_{-0.025}$ $R_B$=$0.411 ^{+0.027}_{-0.039}$, respectively. Comparisons with stellar models for low mass stars show that one star is consistent with model predictions whereas the other is substantially oversized. Spectral analysis of the system suggests a primary of spectral type M3V, consistent with both modelled masses and radii, and with SED fitting of NGTS photometry. As the most eccentric eclipsing M-dwarf binary known, NGTS J214358.5-380102 provides an interesting insight into the strength of tidal effects in the circularisation of stellar orbits.
