1. The CARMENES search for exoplanets around M dwarfs -- LP 714-47b (TOI 442.01): Populating the Neptune desert
- Author
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Dreizler, S., Crossfield, M., Kossakowski, D., Plavchan, P., Jeffers, V., Kemmer, J., Luque, R., Espinoza, N., Pallé, E., Stassun, K., Matthews, E., Cale, B., Caballero, A., Schlecker, M., Lillo-Box, J., Zechmeister, M., Lalitha, S., Reiners, A., Soubkiou, A., Bitsch, B., Osorio, R. Zapatero, Chaturvedi, P., Hatzes, P., Ricker, G., Vanderspek, R., Latham, W., Seager, S., Winn, J., Jenkins, J. M., Aceituno, J., Amado, J., Barkaoui, K., Barbieri, M., Batalha, M., Bauer, F., Benneke, B., Benkhaldoun, Z., Beichman, Berberian, J., Burt, J., Butler, P., Caldwell, A., Chintada, A., Chontos, A., Christiansen, L., Ciardi, D. R., Cifuentes, C., Collins, A., Collins, I., Combs, D., Cortés-Contreras, M., Crane, D., Daylan, T., Dragomir, D., Esparza-Borges, E., Evans, P., Feng, F., Flowers, E., Fukui, A., Fulton, B., Furlan, E., Gaidos, E., Geneser, C., Giacalone, S., Gillon, M., Gonzales, E., Gorjian, V., Hellier, C., Hidalgo, D., Howard, W., Howell, S., Huber, D., Isaacson, H., Jehin, E., Jensen, N., Kaminski, A., Kane, R., Kawauchi, K., Kielkopf, F., Klahr, H., Kosiarek, R., Kreidberg, L., Kürster, Lafarga, M., Livingston, J., Louie, D., Mann, A., Madrigal-Aguado, A., Matson, A., Mocnik, T., Morales, C., Muirhead, S., Murgas, F., Nandakumar, S., Narita, N., Nowak, G., Oshagh, M., Parviainen, H., Passegger, M., Pollacco, D., Pozuelos, J., Quirrenbach, A., Reefe, M., Ribas, I., Robertson, P., Rodríguez-López, C., Rose, E., Roy, A., Schweitzer, A., Schlieder, J., Shectman, S., Tanner, A., Şenavcı, V., Teske, J., Twicken, D., Villasenor, J., Wang, S. X., Weiss, M., Wittrock, J., Yılmaz, M., and Zohrabi, F.
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Astrophysics - Earth and Planetary Astrophysics ,Astrophysics - Instrumentation and Methods for Astrophysics - Abstract
We report the discovery of a Neptune-like planet (LP 714-47 b, P = 4.05204 d, m_b = 30.8 +/- 1.5 M_earth , R_b = 4.7 +/- 0.3 R_earth ) located in the 'hot Neptune desert'. Confirmation of the TESS Object of Interest (TOI 442.01) was achieved with radial-velocity follow-up using CARMENES, ESPRESSO, HIRES, iSHELL, and PFS, as well as from photometric data using TESS, Spitzer, and ground-based photometry from MuSCAT2, TRAPPIST- South, MONET-South, the George Mason University telescope, the Las Cumbres Observatory Global Telescope network, the El Sauce telescope, the TUBITAK National Observatory, the University of Louisville Manner Telescope, and WASP-South. We also present high-spatial resolution adaptive optics imaging with the Gemini Near-Infrared Imager. The low uncertainties in the mass and radius determination place LP 714-47 b among physically well-characterised planets, allowing for a meaningful comparison with planet structure models. The host star LP 714-47 is a slowly rotating early M dwarf (T_eff = 3950 +/- 51 K) with a mass of 0.59 +/- 0.02 M_sun and a radius of 0.58 +/- 0.02 R_sun. From long-term photometric monitoring and spectroscopic activity indicators, we determine a stellar rotation period of about 33 d. The stellar activity is also manifested as correlated noise in the radial-velocity data. In the power spectrum of the radial-velocity data, we detect a second signal with a period of 16 days in addition to the four-day signal of the planet. This could be shown to be a harmonic of the stellar rotation period or the signal of a second planet. It may be possible to tell the difference once more TESS data and radial-velocity data are obtained., Comment: Accepted for publication in A&A. 24 pages, 21 figures, 5 tables
- Published
- 2020
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