Cluster Difference Imaging Photometric Survey. II. TOI 837: A Young Validated Planet in IC 2602
Cluster Difference Imaging Photometric Survey. II. TOI 837: A Young Validated Planet in IC 2602
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DOI：
10.3847/1538-3881/abb9ab
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发表时间：
2020-09
期刊：
影响因子：
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通讯作者：
L. Bouma;J. Hartman;R. Brahm;P. Evans;K. Collins;G. Zhou;P. Sarkis;S. Quinn;J. D. Leon
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文献类型：
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作者：
L. Bouma;J. Hartman;R. Brahm;P. Evans;K. Collins;G. Zhou;P. Sarkis;S. Quinn;J. D. Leon
我们报告了TOI 837 b的发现及其作为过境行星的验证。我们的特点系统使用的数据从美国宇航局过境系外行星调查卫星使命，欧空局盖亚使命，地面测光从厄尔尼诺酱料和ASTEP400，和光谱从CHIRON，FEROS，和Veloce。我们发现TOI 837是一颗位于南部疏散星团IC 2602的T = 9.9等G0/F9矮星。因此，这颗星星和行星的年龄是百万年。结合凌日测光和由星团色星等图导出的恒星参数的先验，我们发现该行星的轨道周期为，比木星略小（）。根据径向速度监测，我们将其限制为小于1.20 MJup（3 σ）。凌日会擦过或几乎擦过恒星边缘。掠凌是一个令人关切的问题，因为它们往往表明天体物理假阳性的情况。我们的后续数据显示，这种情况不太可能发生。我们的综合测光，高分辨率成像和径向速度排除了分层食二进制的情况。背景食二进制的情况下，虽然有限的斑点成像，仍然是0.2%的可能性。因此，TOI 837 b是一颗经过验证的青春期系外行星。该系统的行星性质可以通过对恒星质量和行星质量的观测来证实或反驳。这样的观测也可能提高我们对系外行星的物理和轨道特性如何随时间变化的理解。
We report the discovery of TOI 837b and its validation as a transiting planet. We characterize the system using data from the NASA Transiting Exoplanet Survey Satellite mission, the ESA Gaia mission, ground-based photometry from El Sauce and ASTEP400, and spectroscopy from CHIRON, FEROS, and Veloce. We find that TOI 837 is a T = 9.9 mag G0/F9 dwarf in the southern open cluster IC 2602. The star and planet are therefore million years old. Combining the transit photometry with a prior on the stellar parameters derived from the cluster color–magnitude diagram, we find that the planet has an orbital period of and is slightly smaller than Jupiter ( ). From radial velocity monitoring, we limit to less than 1.20 MJup (3σ). The transits either graze or nearly graze the stellar limb. Grazing transits are a cause for concern, as they are often indicative of astrophysical false-positive scenarios. Our follow-up data show that such scenarios are unlikely. Our combined multicolor photometry, high-resolution imaging, and radial velocities rule out hierarchical eclipsing binary scenarios. Background eclipsing binary scenarios, though limited by speckle imaging, remain a 0.2% possibility. TOI 837b is therefore a validated adolescent exoplanet. The planetary nature of the system can be confirmed or refuted through observations of the stellar obliquity and the planetary mass. Such observations may also improve our understanding of how the physical and orbital properties of exoplanets change in time.