학술논문
The CARMENES search for exoplanets around M dwarfs -- LP 714-47b (TOI 442.01): Populating the Neptune desert
Document Type
Working Paper
Author
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.; Zohrabi, F.
Source
A&A 644, A127 (2020)
Subject
Language
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
Comment: Accepted for publication in A&A. 24 pages, 21 figures, 5 tables