A 38 Million Year Old Neptune-Sized Planet in the Kepler Field
| Autor: | Bouma, L. G., Curtis, J. L., Masuda, K., Hillenbrand, L. A., Stefansson, G., Isaacson, H., Narita, N., Fukui, A., Ikoma, M., Tamura, M., Kraus, A. L., Furlan, E., Gnilka, C. L., Lester, K. V., Howell, S. B. |
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| Rok vydání: | 2021 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.3847/1538-3881/ac4966 |
| Popis: | Kepler 1627A is a G8V star previously known to host a 3.8 Earth-radius planet on a 7.2 day orbit. The star was observed by the Kepler space telescope because it is nearby (d=329 pc) and it resembles the Sun. Here we show using Gaia kinematics, TESS stellar rotation periods, and spectroscopic lithium abundances that Kepler 1627 is a member of the 38 $\pm$ 6 Myr old $\delta$ Lyr cluster. To our knowledge, this makes Kepler 1627Ab the youngest planet with a precise age yet found by the prime Kepler mission. The Kepler photometry shows two peculiarities: the average transit profile is asymmetric, and the individual transit times might be correlated with the local light curve slope. We discuss possible explanations for each anomaly. More importantly, the $\delta$ Lyr cluster is one of about 10$^3$ coeval groups whose properties have been clarified by Gaia. Many other exoplanet hosts are candidate members of these clusters; these memberships can be verified with the trifecta of Gaia, TESS, and ground-based spectroscopy. Comment: AJ accepted, Table 3 available upon request |
| Databáze: | arXiv |
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