TOI-1201 b: a mini-Neptune transiting a bright and moderately young M dwarf
/ Authors
D. Kossakowski, J. Kemmer, P. Bluhm, S. Stock, J. Caballero, V. J. S. B'ejar, C. C. Guill'en, N. Lodieu, K. Collins, M. Oshagh
and 55 more authors
M. Schlecker, N. Espinoza, E. Pall'e, T. Henning, L. Kreidberg, M. Kurster, P. Amado, D. Anderson, J. Morales, D. Conti, D. Galadí-Enríquez, P. Guerra, S. Cartwright, D. Charbonneau, P. Chaturvedi, C. Cifuentes, M. Contreras, S. Dreizler, C. Hellier, C. Henze, E. Herrero, S. Jeffers, J. Jenkins, E. Jensen, A. Kaminski, J. Kielkopf, M. Kunimoto, M. Lafarga, D. Latham, J. Lillo-Box, R. Luque, K. Molaverdikhani, D. Montes, G. Morello, E. Morgan, G. Nowak, A. Pavlov, M. Perger, E. Quintana, A. Quirrenbach, S. Reffert, A. Reiners, G. Ricker, I. Ribas, C. Lopez, M. Z. Osorio, S. Seager, P. Schoefer, A. Schweitzer, T. Trifonov, S. Vanaverbeke, R. Vanderspek, R. West, J. Winn, M. Zechmeister
/ Abstract
We present the discovery of a transiting mini-Neptune around TOI-1201, a relatively bright and moderately young early M dwarf ( J ≈ 9.5mag, ∼ 600–800Myr) in an equal-mass ∼ 8arcsecond-wide binary system, using data from the Transiting Exoplanet Survey Satel- lite, along with follow-up transit observations. With an orbital period of 2.49d, TOI-1201 b is a warm mini-Neptune with a radius of R b = 2 . 415 ± 0 . 090 R ⊕ . This signal is also present in the precise radial velocity measurements from CARMENES, confirming the existence of the planet and providing a planetary mass of M b = 6 . 28 ± 0 . 88 M ⊕ and, thus, an estimated bulk density of 2 . 45 + 0 . 48 − 0 . 42 gcm − 3 . The spectroscopic observations additionally show evidence of a signal with a period of 19d and a long periodic variation of unde-termined origin. In combination with ground-based photometric monitoring from WASP-South and ASAS-SN, we attribute the 19d signal to the stellar rotation period ( P rot = 19–23d), although we cannot rule out that the variation seen in photometry belongs to the visually close binary companion. We calculate precise stellar parameters for both TOI-1201 and its companion. The transiting planet is an excellent target for atmosphere characterization (the transmission spectroscopy metric is 97 + 21 − 16 ) with the upcoming James Webb Space Telescope. It is also feasible to measure its spin-orbit alignment via the Rossiter-McLaughlin effect using current state-of-the-art spectrographs with submeter per second radial velocity precision.
Journal: Astronomy & Astrophysics