来自新Luyten十分之二星表的四个新的食中M矮星系统
Four new eclipsing mid M-dwarf systems from the New Luyten Two Tenths catalog
摘要：
利用MEarth-北和MEarth-南过境调查的数据，我们提出了四个中M矮星系统的日食检测：LP 107-25，LP 261-75，LP 796-24和LP 991-15。结合MEarth测光和光谱跟踪观测，我们发现LP 107-25和LP 796-24是短周期（分别为1.388和0.523天）的食双星，在三线系统中有大量的第三光污染来自遥远的同伴。LP 261-75是一个短周期（1.882天）单线系统，由一颗中M矮星和另一颗远距离可见棕矮星伴星组成。LP 991-15是一颗长周期（29.3天）双线食双星，在偏心轨道上运行，其几何形状只产生主食。给出了LP 991-15的光谱轨道，以及LP 107-25和LP 261-75的初始轨道。
英文摘要：
Using data from the MEarth-North and MEarth-South transit surveys, we present the detection of eclipses in four mid M-dwarf systems: LP 107-25, LP 261-75, LP 796-24, and LP 991-15. Combining the MEarth photometry with spectroscopic follow-up observations, we show that LP 107-25 and LP 796-24 are short-period (1.388 and 0.523 day, respectively) eclipsing binaries in triple-lined systems with substantial third light contamination from distant companions. LP 261-75 is a short-period (1.882 day) single-lined system consisting of a mid M-dwarf eclipsed by a probable brown dwarf secondary, with another distant visual brown dwarf companion. LP 991-15 is a long-period (29.3 day) double-lined eclipsing binary on an eccentric orbit with a geometry which produces only primary eclipses. A spectroscopic orbit is given for LP 991-15, and initial orbits for LP 107-25 and LP 261-75.
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