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Judith Korth



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


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

Summary, in English

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.

Publishing year





Astronomy and Astrophysics



Document type

Journal article


EDP Sciences


  • Planets and satellites: gaseous planets
  • Planets and satellites: general
  • Stars: individual: TOI-674
  • Techniques: photometric
  • Techniques: radial velocities




  • ISSN: 0004-6361