Cluster Difference Imaging Photometric Survey. II. TOI 837: A Young Validated Planet in IC 2602

Bouma, L. G. and Hartman, J. D. and Brahm, R. and Evans, P. and Collins, K. A. and Zhou, G. ORCID: and Sarkis, P. and Quinn, S. N. and de Leon, J. and Livingston, J. and Bergmann, C. and Stassun, K. G. and Bhatti, W. and Winn, J. N. and Bakos, G. A. and Abe, L. and Crouzet, N. and Dransfield, G. and Guillot, T. and Marie-Sainte, W. and Mekarnia, D. and Triaud, A. H. M. J. and Tinney, C. G. and Henning, T. and Espinoza, N. and Jordan, A. and Barbieri, M. and Nandakumar, S. and Trifonov, T. and Vines, J. I. and Vuckovic, M. and Ziegler, C. and Law, N. and Mann, A. W. and Ricker, G. R. and Vanderspek, R. and Seager, S. and Jenkins, J. M. and Burke, C. J. and Dragomir, D. and Levine, A. M. and Quintana, E. V. and Rodriguez, J. E. and Smith, J. C. and Wohler, B. (2020) Cluster Difference Imaging Photometric Survey. II. TOI 837: A Young Validated Planet in IC 2602. The Astronomical Journal, 160 (5):239. pp. 1-20. ISSN 0004-6256

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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 M Jup (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.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 14 Feb 2022 00:09
Last Modified: 14 Feb 2022 02:15
Uncontrolled Keywords: Exoplanets; Transits; Exoplanet evolution; Stellar ages; Young star; Clusters; Astrophysics - Earth and Planetary; Astrophysics; Astrophysics - Solar and Stellar Astrophysics
Fields of Research (2008): 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280120 Expanding knowledge in the physical sciences
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