planets and satellites: general; planets and satellites: gaseous planets; stars: individual: TOI-674; techniques: photometric; techniques: radial velocities; Astrophysics - Earth and Planetary Astrophysics; Astrophysics - Solar and Stellar Astrophysics
Abstract :
[en] Context. The NASA mission TESS is currently doing an all-sky survey from space to detect transiting planets around bright stars. As part of the validation process, the most promising planet candidates need to be confirmed and characterized using follow-up observations. Aims: In this article, our aim is to confirm the planetary nature of the transiting planet candidate TOI-674b using spectroscopic and photometric observations. Methods: We use TESS, Spitzer, ground-based light curves, and HARPS spectrograph radial velocity measurements to establish the physical properties of the transiting exoplanet candidate TOI-674b. We perform a joint fit of the light curves and radial velocity time series to measure the mass, radius, and orbital parameters of the candidate. Results: We confirm and characterize TOI-674b, a low-density super-Neptune transiting a nearby M dwarf. The host star (TIC 158588995, V = 14.2 mag, J = 10.3 mag) is characterized by its M2V spectral type with M⋆ = 0.420 ± 0.010 M⊙, R⋆ = 0.420 ± 0.013 R⊙, and Teff = 3514 ± 57 K; it is located at a distance d = 46.16 ± 0.03 pc. Combining the available transit light curves plus radial velocity measurements and jointly fitting a circular orbit model, we find an orbital period of 1.977143 ± 3 × 10^−6 days, a planetary radius of 5.25 ± 0.17 R⊕, and a mass of 23.6 ± 3.3 M⊕ implying a mean density of ρ_p =0.91 ± 0.15 g cm^−3. A non-circular orbit model fit delivers similar planetary mass and radius values within the uncertainties. Given the measured planetary radius and mass, TOI-674b is one of the largest and most massive super-Neptune class planets discovered around an M-type star to date. It is found in the Neptunian desert, and is a promising candidate for atmospheric characterization using the James Webb Space Telescope.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Murgas, F.; Instituto de Astrofísica de Canarias (IAC), 38205, La Laguna, Tenerife, Spain ; Departamento de Astrofísica, Universidad de La Laguna (ULL), 38206, La Laguna, Tenerife, Spain
Astudillo-Defru, N.; Departamento de Matemática y Física Aplicadas, Universidad Católica de la Santísima Concepción, Alonso de Rivera 2850, Concepción, Chile
Bonfils, X.; Univ. Grenoble Alpes, CNRS, IPAG, 38000, Grenoble, France
Crossfield, I.; Department of Physics and Astronomy, University of Kansas, Lawrence, KS, USA
Almenara, J. M.; Univ. Grenoble Alpes, CNRS, IPAG, 38000, Grenoble, France
Livingston, J.; Department of Astronomy, University of Tokyo 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
Stassun, K. G.; Vanderbilt University, Department of Physics & Astronomy, 6301 Stevenson Center Ln., Nashville, TN 37235, USA
Korth, J.; Department of Space, Earth and Environment, Astronomy and Plasma Physics, Chalmers University of Technology, 412 96, Gothenburg, Sweden
Orell-Miquel, J.; Instituto de Astrofísica de Canarias (IAC), 38205, La Laguna, Tenerife, Spain ; Departamento de Astrofísica, Universidad de La Laguna (ULL), 38206, La Laguna, Tenerife, Spain
Morello, G.; Instituto de Astrofísica de Canarias (IAC), 38205, La Laguna, Tenerife, Spain ; Departamento de Astrofísica, Universidad de La Laguna (ULL), 38206, La Laguna, Tenerife, Spain
Eastman, J. D.; Center for Astrophysics | Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138, USA
Lissauer, J. J.; NASA Ames Research Center, Moffett Field, CA, 94035, USA
Kane, S. R.; Department of Earth and Planetary Sciences, University of California, Riverside, CA 92521, USA
Morales, F. Y.; Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
Werner, M. W.; Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
Gorjian, V.; Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
Benneke, B.; Université de Montréal, Département de Physique & Institut de Recherche sur les Exoplanètes, Montréal, QC H3C 3J7, Canada
Dragomir, D.; Department of Physics and Astronomy, University of New Mexico, 210 Yale Blvd NE, Albuquerque, NM 87106, USA
Matthews, E. C.; Observatoire de l'Université de Genève, Chemin des Maillettes 51, 1290, Versoix, Switzerland
Howell, S. B.; NASA Ames Research Center, Moffett Field, CA, 94035, USA
Ciardi, D.; Caltech/IPAC, 1200 E. California Blvd. Pasadena, CA 91125, USA
Gonzales, E.; Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064, USA
Matson, R.; U.S. Naval Observatory, Washington, DC 20392, USA
Beichman, C.; Caltech/IPAC, 1200 E. California Blvd. Pasadena, CA 91125, USA
Schlieder, J.; NASA Goddard Space Flight Center, 8800 Greenbelt Rd, Greenbelt, MD 20771, USA
Collins, K. A.; Center for Astrophysics | Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138, USA
Collins, K. I.; George Mason University, 4400 University Drive, Fairfax, VA, 22030, USA
Jensen, E. L. N.; Department of Physics & Astronomy, Swarthmore College, Swarthmore, PA, 19081, USA
Evans, P.; El Sauce Observatory, Coquimbo Province, Chile
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Barkaoui, Khalid ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic
Artigau, E.; Université de Montréal, Département de Physique & Institut de Recherche sur les Exoplanètes, Montréal, QC H3C 3J7, Canada
Bouchy, F.; Observatoire de l'Université de Genève, Chemin des Maillettes 51, 1290, Versoix, Switzerland
Charbonneau, D.; Center for Astrophysics | Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138, USA
Delfosse, X.; Univ. Grenoble Alpes, CNRS, IPAG, 38000, Grenoble, France
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Doyon, R.; Université de Montréal, Département de Physique & Institut de Recherche sur les Exoplanètes, Montréal, QC H3C 3J7, Canada
Figueira, P.; European Southern Observatory, Alonso de Córdova 3107, Vitacura, Región Metropolitana, Chile ; Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762, Porto, Portugal
Forveille, T.; Univ. Grenoble Alpes, CNRS, IPAG, 38000, Grenoble, France
Lovis, C.; Observatoire de l'Université de Genève, Chemin des Maillettes 51, 1290, Versoix, Switzerland
Melo, C.; European Southern Observatory, Alonso de Córdova 3107, Vitacura, Región Metropolitana, Chile
Gaisné, G.; Univ. Grenoble Alpes, CNRS, IPAG, 38000, Grenoble, France
Pepe, F.; Observatoire de l'Université de Genève, Chemin des Maillettes 51, 1290, Versoix, Switzerland
Santos, N. C.; Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762, Porto, Portugal ; Departamento de Física e Astronomia, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 4169-007, Porto, Portugal
Ségransan, D.; Observatoire de l'Université de Genève, Chemin des Maillettes 51, 1290, Versoix, Switzerland
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Levine, A. M.; Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
Quintana, E. V.; NASA Goddard Space Flight Center, 8800 Greenbelt Rd, Greenbelt, MD 20771, USA
Guerrero, N. M.; Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
Mireles, I.; Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
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Vanderspek, R.; Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
Latham, D. W.; Center for Astrophysics | Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138, USA
Seager, S.; Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA ; Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA ; Department of Aeronautics and Astronautics, MIT, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
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