NGTS J214358.5-380102 - NGTS discovery of the most eccentric known eclipsing M-dwarf binary system
NGTS J214358.5-380102 - NGTS discovery of the most eccentric known eclipsing M-dwarf binary system
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NGTS J214358.5-380102 - NGTS 发现已知最古怪的食 M 矮星双星系统
DOI：
10.1093/mnras/staa928
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发表时间：
2020
影响因子：
4.8
通讯作者：
Acton J
中科院分区：
文献类型：
--
作者：
Acton J
我们介绍了NGTS2 14358.5-380102的发现，这是一颗由下一代凌日调查(NGTS)发现的偏心M矮星双星。7.618天的系统周期比许多已知的食M-矮星双星系统都要长。它的轨道偏心率相对于双星的周期和半长轴很大。测光和径向速度的全球模拟表明恒星质量分别为MA=M⊙，MB=M⊙和恒星半径RA=R⊙，RB=R⊙。与低质量恒星的恒星模型比较表明，一颗恒星与模型预测一致，而另一颗恒星则大幅超大。对该系统的光谱分析表明，该系统的光谱类型为M3V，与模拟的质量和半径以及NGTS光度法的光谱能量分布拟合一致。作为已知的最偏心的食M矮星双星，NGTS2 14358.5-380102提供了一个有趣的洞察潮汐效应在恒星轨道环化中的强度。
We present the discovery of NGTS J214358.5–380102, an eccentric M-dwarf binary discovered by the Next-Generation Transit Survey (NGTS). The system period of 7.618 d is greater than many known eclipsing M-dwarf binary systems. Its orbital eccentricity ofis large relative to the period and semimajor axis of the binary. Global modelling of photometry and radial velocities indicates stellar masses ofMA=M⊙,MB=M⊙and stellar radiiRA=R⊙,RB=R⊙, 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 spectral energy distribution 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 circularization of stellar orbits.