逃脱的那个：年轻的褐矮星Roque 12的独特日食
The one that got away: A unique eclipse in the young brown dwarf Roque 12
摘要：
我们报告发现了一个深刻的，奇异的日食真正的褐矮星罗克12，一个亚恒星成员的昂宿星团。这次月食深度为0.65等，持续时间为1.3小时，在2002年10月由两架望远镜同时观测到。尽管开普勒/K2在2015年连续监测了70天，但没有进一步的日食记录。有初步（2西格玛）的径向速度变化为5公里/秒，超过三个月的时间尺度的证据。对日食的最好解释是在偏心轨道上有一个伴星。观测结果表明，偏心率e>0.5，周期P> 70 d，伴星质量约为0.001-0.04Msol。原则上，日食也有可能是由绕星物质引起的。未来盖亚和LSST发布的数据以及改进的径向速度约束可能能够明确地确认伴星的存在。这将使该系统成为极少数已知年龄的食双星褐矮星之一。
英文摘要：
We report the discovery of a deep, singular eclipse of the bona fide brown dwarf Roque 12, a substellar member of the Pleiades. The eclipse was 0.65mag deep, lasted 1.3h, and was observed with two telescopes simultaneously in October 2002. No further eclipse was recorded, despite continuous monitoring with Kepler/K2 over 70d in 2015. There is tentative (2sigma) evidence for radial velocity variations of 5km/s, over timescales of three months. The best explanation for the eclipse is the presence of a companion on an eccentric orbit. The observations constrain the eccentricity to e>0.5, the period to P>70d, and the mass of the companion to ~0.001-0.04Msol. In principle it is also possible that the eclipse is caused by circum-sub-stellar material. Future data releases by Gaia and later LSST as well as improved radial velocity constraints may be able to unambiguously confirm the presence of the companion. This would turn the system into one of the very few known eclipsing binary brown dwarfs with known age.
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