arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1609.02767astro-ph.EP
收藏

HAT-P-65 b和HAT-P-66 b:两个凌日膨胀的热彗星和近距离巨行星再膨胀的观测证据

HAT-P-65b and HAT-P-66b: Two Transiting Inflated Hot Jupiters and Observational Evidence for the Re-Inflation of Close-In Giant Planets

Joel D. Hartman, Gáspár Á. Bakos, Waqas Bhatti, Kaloyan Penev, Allyson Bieryla, David W. Latham, Géza Kovács, Guillermo Torres, Zoltan Csubry, Miguel de Val-Bor… 展开作者

Joel D. Hartman, Gáspár Á. Bakos, Waqas Bhatti, Kaloyan Penev, Allyson Bieryla, David W. Latham, Géza Kovács, Guillermo Torres, Zoltan Csubry, Miguel de Val-Borro, Lars Buchhave, Tamás Kovács, Samuel Quinn, Andrew W. Howard, Howard Isaacson, Benjamin J. Fulton, Mark E. Everett, Gilbert A. Esquerdo, Bence Béky, Tamás Szklenar, Emilio Falco, Alexandre Santerne, Isabelle Boisse, Guillaume Hébrard, Adam Burrows, Jozsef Lázár, István Papp, Pál Sári

摘要:

我们发现了凌日系外行星HAT-P-65 b和HAT-P-66 b,轨道周期分别为2.6055 d和2.9721 d,质量分别为$0.527 \pm 0.083$ M $_{J}$和$0.783 \pm 0.057$ M $_{J}$,膨胀半径分别为$1.89 \pm 0.13$ R $_{J}$和$1.59^{+0.16}_{-0.10}$ R $_{J}$。它们围绕中等亮度($V=13.145 \pm 0.029$和$V=12.993 \pm 0.052$)恒星运行,质量分别为$1.212 \pm 0.050$ M $_{\odot}$和$1.255^{+0.107}_{-0.054}$ M $_{\odot}$。星星在主序星的岔道上。虽然众所周知,近距离巨行星的半径与它们的平衡温度相关,但行星的半径是否会随着它们的宿主进化而增加,变得更加明亮,这是一个悬而未决的问题。通过观察更广泛的近距离凌日巨行星样本,我们发现行星半径与其宿主恒星的分数年龄之间存在统计学显著相关性,误报概率仅为0.0041%。我们发现行星半径与其宿主的分数年龄之间的相关性完全可以用行星半径与其现今平衡温度之间的已知相关性来解释,但是如果用零年龄的主序平衡温度代替现今平衡温度,那么还必须包括与年龄的相关性来解释行星半径。这表明,在主序前收缩后,由于从其宿主恒星接收到的辐射水平增加,近距离的巨行星会随着时间的推移而重新膨胀。先前的理论工作表明,这种对辐射的动态响应需要很大一部分入射能量沉积在行星内部深处。

英文摘要:

We present the discovery of the transiting exoplanets HAT-P-65b and HAT-P-66b, with orbital periods of 2.6055 d and 2.9721 d, masses of $0.527 \pm 0.083$ M$_{J}$ and $0.783 \pm 0.057$ M$_{J}$ and inflated radii of $1.89 \pm 0.13$ R$_{J}$ and $1.59^{+0.16}_{-0.10}$ R$_{J}$, respectively. They orbit moderately bright ($V=13.145 \pm 0.029$, and $V=12.993 \pm 0.052$) stars of mass $1.212 \pm 0.050$ M$_{\odot}$ and $1.255^{+0.107}_{-0.054}$ M$_{\odot}$. The stars are at the main sequence turnoff. While it is well known that the radii of close-in giant planets are correlated with their equilibrium temperatures, whether or not the radii of planets increase in time as their hosts evolve and become more luminous is an open question. Looking at the broader sample of well-characterized close-in transiting giant planets, we find that there is a statistically significant correlation between planetary radii and the fractional ages of their host stars, with a false alarm probability of only 0.0041%. We find that the correlation between the radii of planets and the fractional ages of their hosts is fully explained by the known correlation between planetary radii and their present day equilibrium temperatures, however if the zero-age main sequence equilibrium temperature is used in place of the present day equilibrium temperature then a correlation with age must also be included to explain the planetary radii. This suggests that, after contracting during the pre-main-sequence, close-in giant planets are re-inflated over time due to the increasing level of irradiation received from their host stars. Prior theoretical work indicates that such a dynamic response to irradiation requires a significant fraction of the incident energy to be deposited deep within the planetary interiors.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑