학술논문
TOI-1201 b: A mini-Neptune transiting a bright and moderately young M dwarf
Document Type
Working Paper
Author
Kossakowski, D.; Kemmer, J.; Bluhm, P.; Stock, S.; Caballero, J. A.; Béjar, V. J. S.; Guillén, C. Cardona; Lodieu, N.; Collins, K. A.; Oshagh, M.; Schlecker, M.; Espinoza, N.; Pallé, E.; Henning, Th.; Kreidberg, L.; Kürster, M.; Amado, P. J.; Anderson, D. R.; Morales, J. C.; Conti, D.; Galadi-Enriquez, D.; Guerra, P.; Cartwright, S.; Charbonneau, D.; Chaturvedi, P.; Cifuentes, C.; Contreras, M. Cortes; Dreizler, S.; Hellier, C.; Henze, C.; Herrero, E.; Jeffers, S. V.; Jenkins, J. M.; Jensen, E. L. N.; Kaminski, A.; Kielkopf, J. F.; Kunimoto, M.; Lafarga, M.; Latham, D. W.; Lillo-Box, J.; Luque, R.; Molaverdikhani, K.; Montes, D.; Morello, G.; Morgan, E. H.; Nowak, G.; Pavlov, A.; Perger, M.; Quintana, E. V.; Quirrenbach, A.; Reffert, S.; Reiners, A.; Ricker, G.; Ribas, I.; Lopez, C. Rodriguez; Osorio, M. R. Zapatero; Seager, S.; Schoefer, P.; Schweitzer, A.; Trifonov, T.; Vanaverbeke, S.; Vanderspek, R.; West, R.; Winn, J.; Zechmeister, M.
Source
A&A 656, A124 (2021)
Subject
Language
Abstract
We present the discovery of a transiting mini-Neptune around TOI-1201, a relatively bright and moderately young early M dwarf ($J \approx$ 9.5 mag, $\sim$600-800 Myr) in an equal-mass $\sim$8 arcsecond-wide binary system, using data from the Transiting Exoplanet Survey Satellite (TESS), along with follow-up transit observations. With an orbital period of 2.49 d, TOI-1201 b is a warm mini-Neptune with a radius of $R_\mathrm{b} = 2.415\pm0.090 R_\oplus$. 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 $M_\mathrm{b} = 6.28\pm0.88 M_\oplus$ and, thus, an estimated bulk density of $2.45^{+0.48}_{-0.42}$ g cm$^{-3}$. The spectroscopic observations additionally show evidence of a signal with a period of 19 d and a long periodic variation of undetermined origin. In combination with ground-based photometric monitoring from WASP-South and ASAS-SN, we attribute the 19 d signal to the stellar rotation period ($P_{rot}=$ 19-23 d), 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.
Comment: 33 pages; 18 figures; accepted for publication in A&A
Comment: 33 pages; 18 figures; accepted for publication in A&A