Details

Autor(en) / Beteiligte

• 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.

Titel

TOI-3884 b: A rare 6- R E planet that transits a low-mass star with a giant and likely polar spot

Ist Teil von

• Astronomy and astrophysics (Berlin), 2022-11, Vol.667, p.L11

Erscheinungsjahr

2022

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• 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 E planet. We validate the planet with seeing-limited photometry, high-resolution imaging, and radial velocities. TOI-3884 b, with a radius of 6.00 ± 0.18  R E , 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.