TOI-674b: An oasis in the desert of exo-Neptunes transiting a nearby M dwarf
Artikel i vetenskaplig tidskrift, 2021
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 ρp =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.
Stars: individual: TOI-674
Techniques: photometric
Techniques: radial velocities
Planets and satellites: gaseous planets
Planets and satellites: general
Författare
F. Murgas
Universidad de la Laguna
Instituto de Astrofísica de Canarias
N. Astudillo-Defru
Universidad Catolica de la Santisima Concepcion
X. Bonfils
Université Grenoble Alpes
I. J.M. Crossfield
University of Kansas
J. M. Almenara
Université Grenoble Alpes
J.H. Livingston
University of Tokyo
Keivan G. Stassun
Vanderbilt University
Judith Korth
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
J. Orell-Miquel
Universidad de la Laguna
Instituto de Astrofísica de Canarias
Giuseppe Morello
Instituto de Astrofísica de Canarias
Universidad de la Laguna
J. D. Eastman
Harvard-Smithsonian Center for Astrophysics
Jack J. Lissauer
NASA Ames Research Center
S. R. Kane
University of California
F. Y. Morales
Jet Propulsion Laboratory, California Institute of Technology
M. W. Werner
Universidad Catolica de la Santisima Concepcion
V. Gorjian
Universidad Catolica de la Santisima Concepcion
B. Benneke
Université de Montréal
D. Dragomir
University of New Mexico
Elisabeth Matthews
Université de Genève
S.B. Howell
NASA Ames Research Center
D. R. Ciardi
California Institute of Technology (Caltech)
Erica J. Gonzales
University of California
Rachel A. Matson
US Naval Observatory
C. Beichman
California Institute of Technology (Caltech)
Joshua E. Schlieder
NASA Goddard Space Flight Center
Karen A. Collins
Harvard-Smithsonian Center for Astrophysics
Kevin I. Collins
George Mason University
Eric L.N. Jensen
Swarthmore College
P. Evans
El Sauce Observatory
Francisco J. Pozuelos
Universite de Liège
Michaël Gillon
Universite de Liège
Emmanuel Jehin
Universite de Liège
Khalid Barkaoui
Université Cadi Ayyad
Universite de Liège
E. Artigau
Consejo Nacional de Investigaciones Cientificas y Tecnicas
F. Bouchy
Université de Genève
D. Charbonneau
Harvard-Smithsonian Center for Astrophysics
X. Delfosse
Université Grenoble Alpes
R. F. Diaz
Consejo Nacional de Investigaciones Cientificas y Tecnicas
René Doyon
Université de Montréal
P. Figueira
European Southern Observatory Santiago
Universidade do Porto
T. Forveille
Université Grenoble Alpes
C. Lovis
Université de Genève
C. Melo
European Southern Observatory Santiago
G. Gaisné
Université Grenoble Alpes
Francesco Pepe
Université de Genève
N. C. Santos
Universidade do Porto
D. Segransan
Université de Genève
S. Udry
Université de Genève
Robert Goeke
Massachusetts Institute of Technology (MIT)
A. M. Levine
Massachusetts Institute of Technology (MIT)
E. V. Quintana
NASA Goddard Space Flight Center
N. Guerrero
Massachusetts Institute of Technology (MIT)
Ismael Mireles
Massachusetts Institute of Technology (MIT)
D. A. Caldwell
SETI Institute
NASA Ames Research Center
P. Tenenbaum
SETI Institute
NASA Ames Research Center
C. E. Brasseur
Space Telescope Science Institute (STScI)
George R. Ricker
Massachusetts Institute of Technology (MIT)
Roland K. Vanderspek
Massachusetts Institute of Technology (MIT)
D. W. Latham
Harvard-Smithsonian Center for Astrophysics
S. Seager
Massachusetts Institute of Technology (MIT)
J. N. Winn
Princeton University
Jon M. Jenkins
NASA Ames Research Center
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 653 A60Ämneskategorier
Astronomi, astrofysik och kosmologi
Havs- och vattendragsteknik
Annan fysik
DOI
10.1051/0004-6361/202140718