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arXiv 1602.01901astro-ph.SR
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K2发现的一个新的昴宿星双星和一个毕宿星凌日系统

New Pleiades Eclipsing Binaries and a Hyades Transiting System Identified by K2

Trevor J. David, Kyle E. Conroy, Lynne A. Hillenbrand, Keivan G. Stassun, John Stauffer, Luisa M. Rebull, Ann Marie Cody, Howard Isaacson, Andrew W. Howard, Suzanne Aigrain

备注：
37 pages, 19 figures, 12 tables, accepted to AJ
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摘要：

我们目前的发现开普勒的$K2$任务的观测和我们的后续径向速度观测凯克/HIRES的四个食双星系统在年轻的基准昴星团。基于我们的模拟结果，我们宣布两个新的低质量（$M_{tot} < 0.6 M_\odot$）EB的昴星团成员（HCG 76和MHO 9），我们报告两个以前已知的昴星团双星，也被发现是EB系统（HII 2407和HD 23642）。我们测量了HCG 76的质量，精确度为$\lesssim$ 2.5%，半径精确度为$\lesssim$ 4.5%，加上精确的有效温度，得出了独立的昴星团距离为132 $\pm$ 5 pc。我们讨论了另一个可能的但不太可能的昴星团成员（AK II 465）。这两个新确认的昴星团系统将昴星团EB组分的质量范围扩展到0.2-2 $M_\odot$。在当前恒星模型和名义星团等时线的背景下讨论了我们对昴星团EB的基本恒星参数的初步测量，发现与Baraffe等人（2015）在名义昴星团年龄为1.2亿年时的恒星模型非常一致。最后，在毕星团中，我们报告了一个新的低质量食系统（vA 50），该系统由Mann等人同时发现和研究。我们确认日食很可能是由海王星大小的凌日行星引起的，并在这里提出了额外的径向速度约束，我们改进了对行星最大质量的约束为$\lesssim$ 1.2 $M_\mathrm{Jup}$。

英文摘要：

We present the discovery in Kepler's $K2$ mission observations and our follow-up radial velocity observations from Keck/HIRES for four eclipsing binary (EB) star systems in the young benchmark Pleiades cluster. Based on our modeling results, we announce two new low mass ($M_{tot} < 0.6 M_\odot$) EBs among Pleiades members (HCG 76 and MHO 9) and we report on two previously known Pleiades binaries that are also found to be EB systems (HII 2407 and HD 23642). We measured the masses of the binary HCG 76 to $\lesssim$2.5% precision, and the radii to $\lesssim$4.5% precision, which together with the precise effective temperatures yield an independent Pleiades distance of 132$\pm$5 pc. We discuss another EB towards the Pleiades that is a possible but unlikely Pleiades cluster member (AK II 465). The two new confirmed Pleiades systems extend the mass range of Pleiades EB components to 0.2-2 $M_\odot$. Our initial measurements of the fundamental stellar parameters for the Pleiades EBs are discussed in the context of the current stellar models and the nominal cluster isochrone, finding good agreement with the stellar models of Baraffe et al. (2015) at the nominal Pleiades age of 120 Myr. Finally, in the Hyades, we report a new low mass eclipsing system (vA 50) that was concurrently discovered and studied by Mann et al. (2016). We confirm that the eclipse is likely caused by a Neptune-sized transiting planet, and with the additional radial velocity constraints presented here we improve the constraint on the maximum mass of the planet to be $\lesssim$1.2 $M_\mathrm{Jup}$.

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