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arXiv 1302.2624astro-ph.SRastro-ph.EP
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利用星震学研究开普勒行星候选主星的基本性质

Fundamental Properties of Kepler Planet-Candidate Host Stars using Asteroseismology

Daniel Huber, William J. Chaplin, Jørgen Christensen-Dalsgaard, Ronald L. Gilliland, Hans Kjeldsen, Lars A. Buchhave, Debra A. Fischer, Jack J. Lissauer, Jason … 展开作者

Daniel Huber, William J. Chaplin, Jørgen Christensen-Dalsgaard, Ronald L. Gilliland, Hans Kjeldsen, Lars A. Buchhave, Debra A. Fischer, Jack J. Lissauer, Jason F. Rowe, Roberto Sanchis-Ojeda, Sarbani Basu, Rasmus Handberg, Saskia Hekker, Andrew W. Howard, Howard Isaacson, Christoffer Karoff, David W. Latham, Mikkel N. Lund, Mia Lundkvist, Geoffrey W. Marcy, Andrea Miglio, Victor Silva Aguirre, Dennis Stello, Torben Arentoft, Thomas Barclay, Timothy R. Bedding, Christopher J. Burke, Jessie L. Christiansen, Yvonne P. Elsworth, Michael R. Haas, Steven D. Kawaler, Travis S. Metcalfe, Fergal Mullally, Susan E. Thompson

摘要:

我们使用星震学来确定66颗开普勒行星候选宿主星的基本属性,半径和质量的典型不确定性分别为3%和7%。这些结果包括四颗已确认有行星的主星(开普勒-4、开普勒-14、开普勒-23和开普勒-25)的新的星震解,并将开普勒主星的星震解总数增加到77个。与巴塔利亚等人的行星候选星表中恒星性质的比较表明,从光谱跟踪中获得的亚巨星和巨星的半径系统性地过低,最高可达1.5倍,而未演化恒星的性质则非常一致。我们进一步应用星震学来证实,绝大多数的冷主序星宿主确实是矮星,而不是被错误分类的巨星。使用修改后的恒星属性,我们重新计算了107颗行星候选者在我们的样本中的半径,并评论候选者的半径从以前的巨行星/棕矮星/恒星制度的变化,以亚木星的大小,反之亦然。将来自星震学的恒星密度与Batalha等人的凌日模型(假设圆轨道)得出的密度进行比较,结果表明,由于模拟的碰撞参量中的系统性,或由于可能处于偏心轨道的行星候选者,一半以上的样本存在显著的差异。最后,我们研究了主恒星质量和行星候选者半径,轨道周期和多重性之间的初步相关性,但要注意这些结果可能会受到小样本量和检测偏差的影响。

英文摘要:

We have used asteroseismology to determine fundamental properties for 66 Kepler planet-candidate host stars, with typical uncertainties of 3% and 7% in radius and mass, respectively. The results include new asteroseismic solutions for four host stars with confirmed planets (Kepler-4, Kepler-14, Kepler-23 and Kepler-25) and increase the total number of Kepler host stars with asteroseismic solutions to 77. A comparison with stellar properties in the planet-candidate catalog by Batalha et al. shows that radii for subgiants and giants obtained from spectroscopic follow-up are systematically too low by up to a factor of 1.5, while the properties for unevolved stars are in good agreement. We furthermore apply asteroseismology to confirm that a large majority of cool main-sequence hosts are indeed dwarfs and not misclassified giants. Using the revised stellar properties, we recalculate the radii for 107 planet candidates in our sample, and comment on candidates for which the radii change from a previously giant-planet/brown-dwarf/stellar regime to a sub-Jupiter size, or vice versa. A comparison of stellar densities from asteroseismology with densities derived from transit models in Batalha et al. assuming circular orbits shows significant disagreement for more than half of the sample due to systematics in the modeled impact parameters, or due to planet candidates which may be in eccentric orbits. Finally, we investigate tentative correlations between host-star masses and planet candidate radii, orbital periods, and multiplicity, but caution that these results may be influenced by the small sample size and detection biases.

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