TOI-3884 b: A rare 6-R$_{\oplus}$ planet that transits a low-mass star with a giant and likely polar spot
| Autor: | Almenara, J. M., Bonfils, X., Forveille, T., Astudillo-Defru, N., Ciardi, D. R., Schwarz, R. P., Collins, K. A., Cointepas, M., Lund, M. B., Bouchy, F., Charbonneau, D., Díaz, R. F., Delfosse, X., Kidwell, R. C., Kunimoto, M., Latham, D. W., Lissauer, J. J., Murgas, F., Ricker, G., Seager, S., Vezie, M., Watanabe, D. |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | A&A 667, L11 (2022) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1051/0004-6361/202244791 |
| Popis: | The Transiting Exoplanet Survey Satellite mission identified a deep and asymmetric transit-like signal with a periodicity of 4.5 days orbiting the M4 dwarf star TOI-3884. The signal has been confirmed by follow-up observations collected by the ExTrA facility and Las Cumbres Observatory Global Telescope, which reveal that the transit is chromatic. The light curves are well modelled by a host star having a large polar spot transited by a 6-R$_{\oplus}$ planet. We validate the planet with seeing-limited photometry, high-resolution imaging, and radial velocities. TOI-3884 b, with a radius of $6.00 \pm 0.18$ R$_{\oplus}$, is the first sub-Saturn planet transiting a mid-M dwarf. Owing to the host star's brightness and small size, it has one of the largest transmission spectroscopy metrics for this planet size and becomes a top target for atmospheric characterisation with the James Webb Space Telescope and ground-based telescopes. Comment: 13 pages, 13 figures, accepted for publication in A&A Letters |
| Databáze: | arXiv |
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