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TOI-674b: An oasis in the desert of exo-Neptunes transiting a nearby M dwarf

Authors :
Xavier Bonfils
Michael W. Werner
Nicola Astudillo-Defru
Jon M. Jenkins
George R. Ricker
Ian J. M. Crossfield
Eric L. N. Jensen
David R. Ciardi
Emmanuel Jehin
Judith Korth
David W. Latham
Farisa Y. Morales
Ismael Mireles
Keivan G. Stassun
Étienne Artigau
Rodrigo F. Díaz
J. Orell-Miquel
Pedro Figueira
Stéphane Udry
René Doyon
X. Delfosse
Jack J. Lissauer
Francesco Pepe
Damien Ségransan
Nuno C. Santos
Christophe Lovis
Peter Tenenbaum
Elisa V. Quintana
Björn Benneke
Rachel A. Matson
Jose-Manuel Almenara
Felipe Murgas
Douglas A. Caldwell
Kevin I. Collins
Phil Evans
C. E. Brasseur
Stephen R. Kane
François Bouchy
David Charbonneau
G. Morello
Roland Vanderspek
Charles Beichman
Elisabeth Matthews
T. Forveille
Khalid Barkaoui
Sara Seager
Diana Dragomir
Erica J. Gonzales
Robert F. Goeke
G. Gaisne
Joshua E. Schlieder
John H. Livingston
Natalia Guerrero
Claudio Melo
Alan M. Levine
Joshua N. Winn
Steve B. Howell
Michaël Gillon
Francisco J. Pozuelos
Jason D. Eastman
Varoujan Gorjian
Karen A. Collins
Institut de Planétologie et d'Astrophysique de Grenoble (IPAG)
Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Grenoble (OSUG )
Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])
Departamento de Matemática y Fı́sica Aplicadas [Concepcion] (DMFA)
Universidad Católica de la Santísima Concepción (UCSC)
Centre National d'Études Spatiales [Toulouse] (CNES)-Observatoire des Sciences de l'Univers de Grenoble (OSUG )
Institut national des sciences de l'Univers (INSU - CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Grenoble Alpes (UGA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Grenoble Alpes (UGA)
Children's Hospital of Leeds
Source :
Astronomy and Astrophysics-A&A, Astronomy and Astrophysics-A&A, EDP Sciences, 2021, 653, pp.A60. ⟨10.1051/0004-6361/202140718⟩, CONICET Digital (CONICET), Consejo Nacional de Investigaciones Científicas y Técnicas, instacron:CONICET
Publication Year :
2021
Publisher :
HAL CCSD, 2021.

Abstract

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. 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 $\mathrm{M}_\star=0.420\pm 0.010$ M$_\odot$, $\mathrm{R}_\star = 0.420\pm 0.013$ R$_\odot$, and $\mathrm{T}_{\mathrm{eff}} = 3514\pm 57$ K, and is located at a distance $d=46.16 \pm 0.03$ pc. Combining the available transit light curves plus radial velocity measurements and jointly fitting a circular orbit model, we find an orbital period of $1.977143 \pm 3\times 10^{-6}$ days, a planetary radius of $5.25 \pm 0.17$ $\mathrm{R}_\oplus$, and a mass of $23.6 \pm 3.3$ $\mathrm{M}_\oplus$ implying a mean density of $\rho_\mathrm{p} = 0.91 \pm 0.15$ [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 also a resident of the so-called Neptunian desert and a promising candidate for atmospheric characterisation using the James Webb Space Telescope.<br />Comment: 22 pages, 16 figures. Accepted for publication in A&A

Details

Language :
English
ISSN :
00046361
Database :
OpenAIRE
Journal :
Astronomy and Astrophysics-A&A, Astronomy and Astrophysics-A&A, EDP Sciences, 2021, 653, pp.A60. ⟨10.1051/0004-6361/202140718⟩, CONICET Digital (CONICET), Consejo Nacional de Investigaciones Científicas y Técnicas, instacron:CONICET
Accession number :
edsair.doi.dedup.....1b8dbf299b512c0ec69e07c72bfbe688