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Dreizler, S, Crossfield, IJM, Kossakowski, D, Plavchan, P, Jeffers, SV, Kemmer, J, Luque, R, Espinoza, N, Palle, E, Stassun, K, Matthews, E, Cale, B, Caballero, JA, Schlecker, M, Lillo-Box, J, Zechmeister, M, Lalitha, S, Reiners, A, Soubkiou, A, Bitsch, B, Osorio, MRZ, Chaturvedi, P, Hatzes, AP, Ricker, G, Vanderspek, R, Latham, DW, Seager, S, Winn, J, Jenkins, JM, Aceituno, J, Amado, PJ, Barkaoui, K, Barbieri, M, Batalha, NM, Bauer, FF, Benneke, B, Benkhaldoun, Z, Beichman, C, Berberian, J, Burt, J, Butler, RP, Caldwell, DA, Chintada, A, Chontos, A, Christiansen, JL, Ciardi, DR, Cifuentes, C, Collins, KA, Collins, KI, Combs, D, Cortes-Contreras, M, Crane, JD, Daylan, T, Dragomir, D, Esparza-Borges, E, Evans, P, Feng, F, Flowers, EE, Fukui, A, Fulton, B, Furlan, E, Gaidos, E, Geneser, C, Giacalone, S, Gillon, M, Gonzales, E, Gorjian, V, Hellier, C, Hidalgo, D, Howard, AW, Howell, S, Huber, D, Isaacson, H, Jehin, E, Jensen, ELN, Kaminski, A, Kane, SR, Kawauchi, K, Kielkopf, JF, Klahr, H, Kosiarek, MR, Kreidberg, L, Kurster, M, Lafarga, M, Livingston, J, Louie, D, Mann, A, Madrigal-Aguado, A, Matson, RA, Mocnik, T, Morales, JC, Muirhead, PS, Murgas, F, Nandakumar, S, Narita, N, Nowak, G, Oshagh, M, Parviainen, H, Passegger, VM, Pollacco, D, Pozuelos, FJ, Quirrenbach, A, Reefe, M, Ribas, I, Robertson, P, Rodriguez-Lopez, C, Rose, ME, Roy, A, Schweitzer, A, Schlieder, J, Shectman, S, Tanner, A, Senavci, HV, Teske, J, Twicken, JD, Villasenor, J, Wang, SX, Weiss, LM, Wittrock, J, Yilmaz, M and Zohrabi, F (2020) The CARMENES search for exoplanets around M dwarfs: LP 714-47 b (TOI 442.01): populating the Neptune desert. Astronomy and Astrophysics, 644. ISSN 1432-0746

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Abstract

We report the discovery of a Neptune-like planet (LP 714-47 b, P = 4.05204 d, mb = 30.8 ± 1.5M⊕, Rb = 4.7 ± 0.3 R⊕) 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 TÜBİTAK 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 (Teff = 3950 ± 51 K) with a mass of 0.59 ± 0.02M⊙ and a radius of 0.58 ± 0.02R⊙. 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.

Item Type: Article
Additional Information: The final version of this paper and all relevant things related to it, including copyrights, can be found online at; https://www.aanda.org/articles/aa/abs/2020/12/aa38016-20/aa38016-20.html
Uncontrolled Keywords: methods: data analysis / planetary systems / stars: late-type / stars: individual: LP 714-47 / planets and satellites: individual: LP 714-47 b
Subjects: Q Science > QB Astronomy
Q Science > QB Astronomy > QB460 Astrophysics
Q Science > QB Astronomy > QB600 Planets. Planetology
Q Science > QB Astronomy > QB799 Stars
Divisions: Faculty of Natural Sciences > School of Chemical and Physical Sciences
Related URLs:
Depositing User: Symplectic
Date Deposited: 05 Feb 2021 10:45
Last Modified: 15 Mar 2021 14:52
URI: https://eprints.keele.ac.uk/id/eprint/9138

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