학술논문
TOI-3884 b: A rare 6-R$_{\oplus}$ planet that transits a low-mass star with a giant and likely polar spot
Document Type
Working Paper
Author
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.
Source
A&A 667, L11 (2022)
Subject
Language
Abstract
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
Comment: 13 pages, 13 figures, accepted for publication in A&A Letters