TOI-674b: An oasis in the desert of exo-Neptunes transiting a nearby M dwarf - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Astronomy and Astrophysics - A&A Year : 2021

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

I. Crossfield
  • Function : Author
J. Livingston
K. Stassun
J. Korth
J. Orell-Miquel
  • Function : Author
G. Morello
  • Function : Author
J. Eastman
  • Function : Author
J. Lissauer
  • Function : Author
S. Kane
  • Function : Author
F. Morales
  • Function : Author
M. Werner
V. Gorjian
  • Function : Author
B. Benneke
  • Function : Author
D. Dragomir
E. Matthews
S. Howell
  • Function : Author
D. Ciardi
  • Function : Author
E. Gonzales
  • Function : Author
R. Matson
  • Function : Author
C. Beichman
  • Function : Author
J. Schlieder
  • Function : Author
K. Collins
E. Jensen
P. Evans
F. Pozuelos
  • Function : Author
M. Gillon
E. Jehin
K. Barkaoui
  • Function : Author
E. Artigau
  • Function : Author
F. Bouchy
  • Function : Author
D. Charbonneau
  • Function : Author
X. Delfosse
  • Function : Author
R. Díaz
R. Doyon
  • Function : Author
P. Figueira
  • Function : Author
T. Forveille
C. Lovis
  • Function : Author
C. Melo
  • Function : Author
G. Gaisné
  • Function : Author
F. Pepe
  • Function : Author
N. Santos
  • Function : Author
D. Ségransan
  • Function : Author
S. Udry
R. Goeke
  • Function : Author
A. Levine
E. Quintana
  • Function : Author
N. Guerrero
  • Function : Author
I. Mireles
  • Function : Author
D. Caldwell
  • Function : Author
P. Tenenbaum
  • Function : Author
C. Brasseur
G. Ricker
R. Vanderspek
D. Latham
  • Function : Author
S. Seager
J. Winn
J. Jenkins

Abstract

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 T eff = 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.
Fichier principal
Vignette du fichier
aa40718-21.pdf (2.97 Mo) Télécharger le fichier
Origin : Publisher files allowed on an open archive

Dates and versions

insu-03458387 , version 1 (01-12-2021)

Licence

Attribution

Identifiers

Cite

F. Murgas, N. Astudillo-Defru, Xavier Bonfils, I. Crossfield, J. Almenara, et al.. TOI-674b: An oasis in the desert of exo-Neptunes transiting a nearby M dwarf. Astronomy and Astrophysics - A&A, 2021, 653, pp.A60. ⟨10.1051/0004-6361/202140718⟩. ⟨insu-03458387⟩
35 View
16 Download

Altmetric

Share

Gmail Facebook X LinkedIn More