The Multiplanet System TOI-421

Ilaria Carleo , Davide Gandolfi , Oscar Barragán , John H. Livingston , Carina M. Persson , Kristine W. F. Lam , Aline Vidotto , Michael B. Lund , Carolina Villarreal d'Angelo , Karen A. Collins , Luca Fossati , Andrew W. Howard , Daria Kubyshkina , Rafael Brahm , Antonija Oklopčić , Paul Mollière , Seth Redfield , Luisa Maria Serrano , Fei Dai , Malcolm Fridlund , Francesco Borsa , Judith Korth , Massimiliano Esposito , Matías R. Díaz , Louise Dyregaard Nielsen , Coel Hellier , Savita Mathur , Hans J. Deeg , Artie P. Hatzes , Serena Benatti , Florian Rodler , Javier Alarcon , Lorenzo Spina , Ângela R. G. Santos , Iskra Georgieva , Rafael A. García , Lucía González-Cuesta , George R. Ricker , Roland Vanderspek , David W. Latham , Sara Seager , Joshua N. Winn , Jon M. Jenkins , Simon Albrecht , Natalie M. Batalha , Corey Beard , Patricia T. Boyd , François Bouchy , Jennifer A. Burt , R. Paul Butler , Juan Cabrera , Ashley Chontos , David R. Ciardi , William D. Cochran , Kevin I. Collins , Jeffrey D. Crane , Ian Crossfield , Szilard Csizmadia , Diana Dragomir , Courtney Dressing , Philipp Eigmüller , Michael Endl , Anders Erikson , Nestor Espinoza , Michael Fausnaugh , Fabo Feng , Erin Flowers , Benjamin Fulton , Erica J. Gonzales , Nolan Grieves , Sascha Grziwa , Eike W. Guenther , Natalia M. Guerrero , Thomas Henning , Diego Hidalgo , Teruyuki Hirano , Maria Hjorth , Daniel Huber , Howard Isaacson , Matias Jones , Andrés Jordán , Petr Kabáth , Stephen R. Kane , Emil Knudstrup , Jack Lubin , Rafael Luque , Ismael Mireles , Norio Narita , David Nespral , Prajwal Niraula , Grzegorz Nowak , Enric Palle , Martin Pätzold , Erik A. Petigura , Jorge Prieto-Arranz , Heike Rauer , Paul Robertson , Mark E. Rose , Arpita Roy , Paula Sarkis , Joshua E. Schlieder , Damien Ségransan , Stephen Shectman , Marek Skarka , Alexis M. S. Smith , Jeffrey C. Smith , Keivan Stassun , Johanna Teske , Joseph D. Twicken , Vincent van Eylen , Sharon Wang , Lauren M. Weiss , Aurélien Wyttenbach (1)

1 IPAG - Institut de Planétologie et d'Astrophysique de Grenoble

We report the discovery of a warm Neptune and a hot sub-Neptune transiting TOI-421 (BD-14 1137, TIC 94986319), a bright (V = 9.9) G9 dwarf star in a visual binary system observed by the Transiting Exoplanet Survey Satellite (TESS) space mission in Sectors 5 and 6. We performed ground-based follow-up observations—comprised of Las Cumbres Observatory Global Telescope transit photometry, NIRC2 adaptive optics imaging, and FIbre-fed Echellé Spectrograph, CORALIE, High Accuracy Radial velocity Planet Searcher, High Resolution Échelle Spectrometer, and Planet Finder Spectrograph high-precision Doppler measurements—and confirmed the planetary nature of the 16 day transiting candidate announced by the TESS team. We discovered an additional radial velocity signal with a period of five days induced by the presence of a second planet in the system, which we also found to transit its host star. We found that the inner mini-Neptune, TOI-421 b, has an orbital period of P_b = 5.19672 ± 0.00049 days, a mass of M_b = 7.17 ± 0.66 M_⊕, and a radius of R_b = ${2.68}_{-0.18}^{+0.19}$ R_⊕, whereas the outer warm Neptune, TOI-421 c, has a period of P_c = 16.06819 ± 0.00035 days, a mass of M_c = ${16.42}_{-1.04}^{+1.06}$ M_⊕, a radius of R_c = ${5.09}_{-0.15}^{+0.16}$ R_⊕, and a density of ρ_c = ${0.685}_{-0.072}^{+0.080}$ g cm^-3. With its characteristics, the outer planet (ρ_c = ${0.685}_{-0.072}^{+0.080}$ g cm^-3) is placed in the intriguing class of the super-puffy mini-Neptunes. TOI-421 b and TOI-421 c are found to be well-suited for atmospheric characterization. Our atmospheric simulations predict significant Lyα transit absorption, due to strong hydrogen escape in both planets, as well as the presence of detectable CH₄ in the atmosphere of TOI-421 c if equilibrium chemistry is assumed. ^* Based on observations made with ESO Telescopes at the La Silla Observatory under programs ID 1102.C-0923, 0103.C-0874, 0103.C-0759, 0103.C-0442, and 60.A-970. Based on observations obtained with the Nordic Optical Telescope (NOT), operated on the island of La Palma jointly by Denmark, Finland, Iceland, Norway, and Sweden, in the Spanish Observatorio del Roque de los Muchachos (ORM) of the Instituto de Astrofísica de Canarias (IAC). This paper includes data gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile. This work makes use of observations from the LCOGT network.

Mots clés: Exoplanet astronomy; Exoplanet systems; Exoplanets; Mini Neptunes; Hot Neptunes; Fundamental parameters of stars; High resolution spectroscopy; Transit photometry; Radial velocity; 486; 484; 498; 1063; 754; 555; 2096; 1709; 1332; Astrophysics - Earth and Planetary Astrophysics; Astrophysics - Solar and Stellar Astrophysics

Domaines: Planète et Univers [physics]

Ilaria Carleo, Davide Gandolfi, Oscar Barragán, John H. Livingston, Carina M. Persson, et al.. The Multiplanet System TOI-421. The Astronomical Journal, 2020, 160, ⟨10.3847/1538-3881/aba124⟩. ⟨insu-03705182⟩