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arXiv 2408.02873astro-ph.EP
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利用多来源测光数据缓解精确视向速度中的恒星变率:以 Kepler-21 为例

Utilizing Photometry from Multiple Sources to Mitigate Stellar Variability in Precise Radial Velocities: A Case Study of Kepler-21

Corey Beard, Paul Robertson, Mark R. Giovinazzi, Joseph M. Akana Murphy, Eric B. Ford, Samuel Halverson, Te Han, Rae Holcomb, Jack Lubin, Rafael Luque, Pranav P… 展开作者

Corey Beard, Paul Robertson, Mark R. Giovinazzi, Joseph M. Akana Murphy, Eric B. Ford, Samuel Halverson, Te Han, Rae Holcomb, Jack Lubin, Rafael Luque, Pranav Premnath, Chad F. Bender, Cullen H. Blake, Qian Gong, Howard Isaacson, Shubham Kanodia, Dan Li, Andrea S. J. Lin, 5 Sarah E. Logsdon, Emily Lubar, Michael W. McElwain, Andrew Monson, Joe P. Ninan, Jayadev Rajagopal, Arpita Roy, Christian Schwab, Gudmundur Stefansson, Ryan C. Terrien, Jason T. Wright

AI总结:

该研究结合 Keck/HIRES、WIYN/NEID 视向速度与 Kepler、TESS 测光及 Gaia 天体测量,缓解恒星活动并改进 Kepler-21 参数,排除其行星为水世界,同时发现长周期超级木星候选体。

摘要:

我们对 Kepler-21 进行了一项新分析;它是拥有已知凌星系外行星 Kepler-21 b 的最亮(V = 8.5)Kepler 系统。Kepler-21 b 是一颗半径谷行星(R = 1.6 ± 0.2 R⊕),具有类地球成分(8.38 ± 1.62 g/cc),不过其质量和半径处于可能的“水世界”范围。我们利用新的 Keck/HIRES 和 WIYN/NEID 视向速度(RV)数据,并结合 Kepler 与 TESS 测光,对测光与 RV 之间的活动缓解进行详细研究。我们还改进了系统参数,并利用 Gaia 天体测量约束长期 RV 趋势。我们的活动分析证实,尽管存在时间上的距离,Kepler 测光在去除 RV 中相关噪声方面具有高质量,但也揭示了 TESS 在某些情况下可能更优。利用改进后的轨道参数和更新的成分曲线,我们排除了 Kepler-21 b 的“水世界”情形,并识别出一个长周期超级木星行星候选体 Kepler-21 (c)。

英文摘要:

We present a new analysis of Kepler-21, the brightest (V = 8.5) Kepler system with a known transiting exoplanet, Kepler-21 b. Kepler-21 b is a radius valley planet ($R = 1.6\pm 0.2 R_{\oplus}$) with an Earth-like composition (8.38$\pm$1.62 g/cc), though its mass and radius fall in the regime of possible "water worlds." We utilize new Keck/HIRES and WIYN/NEID radial velocity (RV) data in conjunction with Kepler and TESS photometry to perform a detailed study of activity mitigation between photometry and RVs. We additionally refine the system parameters, and we utilize Gaia astrometry to place constraints on a long-term RV trend. Our activity analysis affirms the quality of Kepler photometry for removing correlated noise from RVs, despite its temporal distance, though we reveal some cases where TESS may be superior. Using refined orbital parameters and updated composition curves, we rule out a ``water world" scenario for Kepler-21 b, and we identify a long period super-Jupiter planetary candidate, Kepler-21 (c).

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。

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