TOI-1201 b: A mini-Neptune transiting a bright and moderately young M dwarf
| Autor: | 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. |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | A&A 656, A124 (2021) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1051/0004-6361/202141587 |
| Popis: | 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 |
| Databáze: | arXiv |
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