Planets and satellites: detection; Planets and satellites: individual: 394137592; Planets and satellites: individual: HD 1397b; Planets and satellites: individual: TOI-120; Eccentric orbits; Eclipsing binaries; High angular resolutions; Planet-star interactions; Planets and satellites: detections; Planets and satellites: individual; Radial velocity measurements; Testing theories; Astronomy and Astrophysics; Space and Planetary Science; astro-ph.EP
Abstract :
[en] The Transiting Exoplanet Survey Satellite TESS has begun a new age of exoplanet discoveries around bright host stars. We present the discovery of HD 1397b (TOI-120.01), a giant planet in an 11.54-day eccentric orbit around a bright (V = 7.9) G-type subgiant. We estimate both host star and planetary parameters consistently using EXOFASTv2 based on TESS time-series photometry of transits and radial velocity measurements with CORALIE and MINERVA-Australis. We also present high angular resolution imaging with NaCo to rule out any nearby eclipsing binaries. We find that HD 1397b is a Jovian planet, with a mass of 0.415 ± 0.020 MJ and a radius of 1.026 ± 0.026 RJ. Characterising giant planets in short-period eccentric orbits, such as HD 1397b, is important for understanding and testing theories for the formation and migration of giant planets as well as planet-star interactions.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Nielsen, L.D. ; Geneva Observatory, University of Geneva, Versoix, Switzerland
Bouchy, F.; Geneva Observatory, University of Geneva, Versoix, Switzerland
Turner, O.; Geneva Observatory, University of Geneva, Versoix, Switzerland
Giles, H.; Geneva Observatory, University of Geneva, Versoix, Switzerland
Suárez Mascareño, A.; Geneva Observatory, University of Geneva, Versoix, Switzerland
Lovis, C.; Geneva Observatory, University of Geneva, Versoix, Switzerland
Marmier, M.; Geneva Observatory, University of Geneva, Versoix, Switzerland
Pepe, F.; Geneva Observatory, University of Geneva, Versoix, Switzerland
Ségransan, D.; Geneva Observatory, University of Geneva, Versoix, Switzerland
Udry, S.; Geneva Observatory, University of Geneva, Versoix, Switzerland
Otegi, J.F.; Geneva Observatory, University of Geneva, Versoix, Switzerland ; Institute for Computational Science, University of Zurich, Zurich, Switzerland
Ottoni, G.; Geneva Observatory, University of Geneva, Versoix, Switzerland
Stalport, Manu ; Université de Liège - ULiège > Unités de recherche interfacultaires > Space sciences, Technologies and Astrophysics Research (STAR) ; Geneva Observatory, University of Geneva, Versoix, Switzerland
Ricker, G.; Department of Physics and Kavli Institute for Astrophysics and Space Research, MIT, Cambridge, United States
Vanderspek, R.; Department of Physics and Kavli Institute for Astrophysics and Space Research, MIT, Cambridge, United States
Latham, D.W.; Harvard-Smithsonian Center for Astrophysics, Cambridge, United States
Seager, S.; Department of Physics and Kavli Institute for Astrophysics and Space Research, MIT, Cambridge, United States ; Department of Earth Atmospheric, and Planetary Sciences, Department of Aeronautics and Astronautics, MIT, Cambridge, United States
Winn, J.N.; Department of Astrophysical Sciences, Princeton University, Princeton, United States
Jenkins, J.M.; NASA Ames Research Center, Moffett Field, United States
Kane, S.R.; Department of Earth Sciences, University of California, Riverside, United States
Wittenmyer, R.A.; University of Southern Queensland, Centre for Astrophysics, Toowoomba, Australia
Bowler, B.; Department of Astronomy, University of Texas at Austin, Austin, United States
Crossfield, I.; Department of Physics and Kavli Institute for Astrophysics and Space Research, MIT, Cambridge, United States
Horner, J.; University of Southern Queensland, Centre for Astrophysics, Toowoomba, Australia
Kielkopf, J.; Department of Physics and Astronomy, University of Louisville, Louisville, United States
Morton, T.; Astronomy Department, University of Florida, 211 Bryant Space Science Center, Gainesville, United States
Plavchan, P.; Department of Physics and Astronomy, George Mason University, Fairfax, United States
Tinney, C.G.; Exoplanetary Science at UNSW, School of Physics, UNSW Sydney, Australia
Zhang, Hui; School of Astronomy and Space Science, Key Laboratory of Ministry of Education, Nanjing University, Nanjing, China
Wright, D.J.; University of Southern Queensland, Centre for Astrophysics, Toowoomba, Australia
Mengel, M.W.; University of Southern Queensland, Centre for Astrophysics, Toowoomba, Australia
Clark, J.T.; University of Southern Queensland, Centre for Astrophysics, Toowoomba, Australia
Okumura, J.; University of Southern Queensland, Centre for Astrophysics, Toowoomba, Australia
Addison, B.; University of Southern Queensland, Centre for Astrophysics, Toowoomba, Australia
Caldwell, D.A.; SETI Institute, Mountain View, United States ; NASA Ames Research Center, Moffett Field, United States
Cartwright, S.M.; Proto-Logic LLC, Washington, United States
Collins, K.A.; Harvard-Smithsonian Center for Astrophysics, Cambridge, United States
Francis, J.; Department of Physics and Kavli Institute for Astrophysics and Space Research, MIT, Cambridge, United States
Guerrero, N.; Department of Physics and Kavli Institute for Astrophysics and Space Research, MIT, Cambridge, United States
Huang, C.X.; Department of Physics and Kavli Institute for Astrophysics and Space Research, MIT, Cambridge, United States
Matthews, E.C.; Department of Physics and Kavli Institute for Astrophysics and Space Research, MIT, Cambridge, United States
Pepper, J.; Department of Physics, Lehigh University, Bethlehem, United States
Rose, M.; Leidos/NASA Ames Research Center, Moffett Field, United States
Villaseñor, J.; Department of Physics and Kavli Institute for Astrophysics and Space Research, MIT, Cambridge, United States
Wohler, B.; SETI Institute, Mountain View, United States ; NASA Ames Research Center, Moffett Field, United States
Stassun, K.; Department of Physics and Astronomy, Vanderbilt University, Nashville, United States
Howell, S.; NASA Ames Research Center, Moffett Field, United States
Ciardi, D.; Caltech/IPAC-NASA Exoplanet Science Institute, M/S 100-22, Pasadena, United States
Gonzales, E.; UC Santa Cruz, Department of Astronomy and Astrophysics, Santa Cruz, United States
Matson, R.; NASA Ames Research Center, Moffett Field, United States
Beichman, C.; Caltech/IPAC-NASA Exoplanet Science Institute, M/S 100-22, Pasadena, United States
Schlieder, J.; NASA Goddard Space Flight Center, Greenbelt, United States
Acknolw edgements. We thank the Swiss National Science Foundation (SNSF) and the Geneva University for their continuous support to our planet search programs. This work has been in particular carried out in the frame of the National Centre for Competence in Research “PlanetS” supported by the Swiss National Science Foundation (SNSF). This publication makes use of The Data & Analysis Center for Exoplanets (DACE), which is a facility based at the University of Geneva (CH) dedicated to extrasolar planets data visualisation, exchange and analysis. DACE is a platform of the Swiss National Centre of Competence in Research (NCCR) PlanetS, federating the Swiss expertise in Exoplanet research. The DACE platform is available at https://dace.unige.ch. We acknowledge the use of TESS Alert data, which is currently in a beta test phase, from the TESS Science Office and at the TESS Science Processing Operations Center. Funding for the TESS mission is provided by NASA’s Science Mission directorate. This work has made use of data from the European Space Agency (ESA) mission Gaia (https://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, https://www.cosmos.esa.int/ web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. This study was in part based on observations collected at the European Southern Observatory under ESO programme 0102.C-0503(A). MINERVA-Australis is supported by Australian Research Council LIEF Grant LE160100001, Discovery Grant DP180100972, Mount Cuba Astronomical Foundation, and institutional partners University of Southern Queensland, MIT, Nanjing University, George Mason University, University of Louisville, University of California Riverside, University of Florida, and University of Texas at Austin.
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