TOI-3493 b: A planet with a Neptune-like density transiting a bright G0-type star
Journal article, 2025
We report the discovery of TOI-3493 b, a sub-Neptune-sized planet on an 8.15-d orbit transiting the bright (V=9.3) G0 star HD 119355 (aka TIC 203377303) initially identified by NASA's TESS space mission. With the aim of confirming the planetary nature of the transit signal detected by TESS and determining the mass of the planet, we performed an intensive Doppler campaign with the HARPS spectrograph, collecting radial velocity measurements. We found that TOI-3493 b lies in a nearly circular orbit and has a mass of 9.0 ± 1.2 M⊕ and a radius of 3.22 ± 0.08 R⊕, implying a bulk density of 1.47-0.22+0.23 g cm-3, consistent with a composition comprising a small solid core surrounded by a thick H/He-dominated atmosphere.
Techniques: photometric
Planets and satellites: detection
Stars: solar-type
Stars: individual: TOI-3493
Techniques: radial velocities
Author
Priyanka Chaturvedi
Thüringer Landessternwarte Tautenburg
Tata Institute of Fundamental Research
E. Goffo
Thüringer Landessternwarte Tautenburg
University of Turin
D. Gandolfi
University of Turin
Carina Persson
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
A. Hatzes
Thüringer Landessternwarte Tautenburg
G. Nowak
Nicolaus Copernicus University (SGMK)
A. Bonfanti
Institut fur Weltraumforschung
Allyson Bieryla
Harvard-Smithsonian Center for Astrophysics
William D. Cochran
The University of Texas at Austin
Karen A. Collins
Harvard-Smithsonian Center for Astrophysics
S. B. Fajardo-Acosta
California Institute of Technology (Caltech)
S.B. Howell
National Aeronautics and Space Administration (NASA)
Jon M. Jenkins
National Aeronautics and Space Administration (NASA)
Judith Korth
Lund University
J.H. Livingston
National Institutes of Natural Sciences
The Graduate University for Advanced Studies (SOKENDAI)
National Astronomical Observatory of Japan
Enric Palle
University of La Laguna
Instituto de Astrofísica de Canarias
Samuel N. Quinn
Harvard-Smithsonian Center for Astrophysics
R. Schwarz
Harvard-Smithsonian Center for Astrophysics
S. Seager
Massachusetts Institute of Technology (MIT)
Avi Shporer
Massachusetts Institute of Technology (MIT)
Keivan G. Stassun
Vanderbilt University
S. Striegel
SETI Institute
Vincent Van Eylen
University College London (UCL)
National Aeronautics and Space Administration (NASA)
Cristilyn N. Watkins
Harvard-Smithsonian Center for Astrophysics
J. N. Winn
Princeton University
C. Ziegler
Stephen F. Austin State University
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 697 A169Subject Categories (SSIF 2025)
Astronomy, Astrophysics, and Cosmology
Meteorology and Atmospheric Sciences
DOI
10.1051/0004-6361/202453511