TOI-3493 b: A planet with a Neptune-like density transiting a bright G0-type star
Artikel i vetenskaplig tidskrift, 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.
Stars: solar-type
Planets and satellites: detection
Techniques: photometric
Techniques: radial velocities
Stars: individual: TOI-3493
Författare
Priyanka Chaturvedi
Thüringer Landessternwarte Tautenburg
Tata Institute of Fundamental Research
E. Goffo
Universita degli Studi di Torino
Thüringer Landessternwarte Tautenburg
D. Gandolfi
Universita degli Studi di Torino
Carina Persson
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
A. Hatzes
Thüringer Landessternwarte Tautenburg
G. Nowak
Uniwersytet Mikolaja Kopernika
A. Bonfanti
Institut fur Weltraumforschung
Allyson Bieryla
Harvard-Smithsonian Center for Astrophysics
William D. Cochran
The University of Texas at Austin
College of Natural Sciences
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
Lunds universitet
J.H. Livingston
National Institutes of Natural Sciences
National Astronomical Observatory of Japan
The Graduate University for Advanced Studies (SOKENDAI)
Enric Palle
Instituto de Astrofísica de Canarias
Universidad de la Laguna
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 A169Ämneskategorier (SSIF 2025)
Astronomi, astrofysik och kosmologi
Meteorologi och atmosfärsvetenskap
DOI
10.1051/0004-6361/202453511