Revised Radii of Kepler Stars and Planets Using Gaia Data Release 2
Revised Radii of Kepler Stars and Planets Using Gaia Data Release 2
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DOI：
10.3847/1538-4357/aada83
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发表时间：
2018-05
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影响因子：
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通讯作者：
T. Berger;D. Huber;E. Gaidos;J. V. van Saders
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作者：
T. Berger;D. Huber;E. Gaidos;J. V. van Saders
利用开普勒使命的数据进行恒星天体物理学和系外行星研究的一个瓶颈是缺乏大多数观测恒星的精确半径和演化状态。我们报告了177，911颗开普勒恒星的修订半径，这些半径是通过将盖亚数据第2版的视差与DR 25开普勒恒星属性目录相结合而得出的。中位半径的精度为1.8%，比之前对典型开普勒恒星的估计提高了4-5倍。我们发现所有开普勒目标中有120，000颗是主序星，137，000颗是次巨星，120，000颗是红巨星，这表明次巨星污染的严重程度低于一些先前的估计，开普勒目标大多是主序星。使用修订后的恒星半径，我们重新计算了2123个确认和1922个候选系外行星的半径。我们证实了小的，近距离的行星的半径分布中存在差距，但发现差距主要限于入射通量>200，其位置可能是在一个稍大的半径（更接近102 R）相比，以前的结果。此外，我们发现了几颗确认的系外行星在高辐照度下占据了先前描述的“热超级地球沙漠”，显示了气体巨行星的半径与其入射通量之间的关系，并建立了一个真正的样本，其中有8颗确认的行星和30颗行星候选者，在星周的“可居住区”（入射通量在0.25和1.50之间）中< 2 R。这里提出的结果表明，使用盖亚数据的恒星和系外行星种群的变革特性的潜力。
One bottleneck for the exploitation of data from the Kepler mission for stellar astrophysics and exoplanet research has been the lack of precise radii and evolutionary states for most of the observed stars. We report revised radii of 177,911 Kepler stars derived by combining parallaxes from the Gaia Data Release 2 with the DR25 Kepler Stellar Properties Catalog. The median radius precision is ≈8%, a typical improvement by a factor of 4–5 over previous estimates for typical Kepler stars. We find that ≈67% (≈120,000) of all Kepler targets are main-sequence stars, ≈21% (≈37,000) are subgiants, and ≈12% (≈21,000) are red giants, demonstrating that subgiant contamination is less severe than some previous estimates and that Kepler targets are mostly main-sequence stars. Using the revised stellar radii, we recalculate the radii for 2123 confirmed and 1922 candidate exoplanets. We confirm the presence of a gap in the radius distribution of small, close-in planets, but find that the gap is mostly limited to incident fluxes >200 , and its location may be at a slightly larger radius (closer to ≈2 R⊕) when compared to previous results. Furthermore, we find several confirmed exoplanets occupying a previously described “hot super-Earth desert” at high irradiance, show the relation between a gas-giant planet’s radius and its incident flux, and establish a bona fide sample of eight confirmed planets and 30 planet candidates with < 2 R⊕ in circumstellar “habitable zones” (incident fluxes between 0.25 and 1.50 ). The results presented here demonstrate the potential for transformative characterization of stellar and exoplanet populations using Gaia data.