TOI-1801 b: A temperate mini-Neptune around a young M0.5 dwarf
Journal article, 2023
We report the discovery, mass, and radius determination of TOI-1801 b, a temperate mini-Neptune around a young M dwarf. TOI-1801 b was observed in TESS sectors 22 and 49, and the alert that this was a TESS planet candidate with a period of 21.3 days went out in April 2020. However, ground-based follow-up observations, including seeing-limited photometry in and outside transit together with precise radial velocity (RV) measurements with CARMENES and HIRES revealed that the true period of the planet is 10.6 days. These observations also allowed us to retrieve a mass of 5.74 +/- 1.46 M-circle plus, which together with a radius of 2.08 +/- 0.12 R-circle plus, means that TOI-1801 b is most probably composed of water and rock, with an upper limit of 2% by mass of H-2 in its atmosphere. The stellar rotation period of 16 days is readily detectable in our RV time series and in the ground-based photometry. We derived a likely age of 600-800 Myr for the parent star TOI-1801, which means that TOI-1801 b is the least massive young mini-Neptune with precise mass and radius determinations. Our results suggest that if TOI-1801 b had a larger atmosphere in the past, it must have been removed by some evolutionary mechanism on timescales shorter than 1 Gyr.
techniques: spectroscopic
planets and satellites: individual: TOI-1801
stars: low-mass
techniques: radial velocities
planets and satellites: atmospheres
planetary systems
Author
M. Mallorquin
University of La Laguna
Instituto de Astrofísica de Canarias
E. Goffo
University of Turin
Thüringer Landessternwarte Tautenburg
E. Palle
Instituto de Astrofísica de Canarias
University of La Laguna
N. Lodieu
University of La Laguna
Instituto de Astrofísica de Canarias
V. J. S. Bejar
Instituto de Astrofísica de Canarias
University of La Laguna
H. Isaacson
University of California
M. R. Zapatero Osorio
Spanish National Research Council (CSIC)
S. Dreizler
University of Göttingen
S. Stock
Heidelberg University
R. Luque
University of Chicago
F. Murgas
University of La Laguna
Instituto de Astrofísica de Canarias
L. Pena
Spanish National Research Council (CSIC)
J. Sanz-Forcada
Spanish National Research Council (CSIC)
Giuseppe Morello
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
D. R. Ciardi
California Institute of Technology (Caltech)
E. Furlan
California Institute of Technology (Caltech)
K. A. Collins
Harvard-Smithsonian Center for Astrophysics
E. Herrero
Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)
S. Vanaverbeke
KU Leuven
Vereniging Voor Sterrenkunde (VVS)
AstroLAB IRIS
P. Plavchan
George Mason University
N. Narita
Astrobiology Center, Japan
University of Tokyo
Instituto de Astrofísica de Canarias
A. Schweitzer
Hamburg Observatory
M. Perez-Torres
Spanish National Research Council (CSIC)
A. Quirrenbach
Heidelberg University
J. Kemmer
Heidelberg University
A. P. Hatzes
Thüringer Landessternwarte Tautenburg
A. Howard
University of California
M. Schlecker
University of Arizona
S. Reffert
Heidelberg University
E. Nagel
University of Göttingen
J. C. Morales
Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)
Spanish National Research Council (CSIC)
J. Orell-Miquel
Instituto de Astrofísica de Canarias
University of La Laguna
C. Duque-Arribas
Complutense University
I. Carleo
University of La Laguna
Instituto de Astrofísica de Canarias
C. Cifuentes
Spanish National Research Council (CSIC)
G. Nowak
Nicolaus Copernicus University
University of La Laguna
Instituto de Astrofísica de Canarias
I. Ribas
Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)
Spanish National Research Council (CSIC)
A. Reiners
University of Göttingen
P. J. Amado
Spanish National Research Council (CSIC)
J. A. Caballero
Spanish National Research Council (CSIC)
Th. Henning
Max Planck Society
V. Pinter
Calar Alto Astronomical Observatory
J. M. Akana Murphy
University of California at Santa Cruz
C. Beard
University of California at Irvine (UCI)
S. Blunt
California Institute of Technology (Caltech)
C. L. Brinkman
University of California at Riverside
University of Hawaii
B. Cale
California Institute of Technology (Caltech)
A. Chontos
University of Hawaii
Princeton University
K. I. Collins
George Mason University
I. J. M. Crossfield
University of Kansas
F. Dai
California Institute of Technology (Caltech)
P. A. Dalba
University of California at Santa Cruz
S. Dufoer
Vereniging Voor Sterrenkunde (VVS)
M. El Mufti
George Mason University
N. Espinoza
Space Telescope Science Institute (STScI)
T. Fetherolf
University of California at Riverside
A. Fukui
University of Tokyo
Instituto de Astrofísica de Canarias
S. Giacalone
University of California
C. Gnilka
National Aeronautics and Space Administration (NASA)
E. Gonzales
University of California at Santa Cruz
S. K. Grunblatt
Johns Hopkins University
S. Howell
National Aeronautics and Space Administration (NASA)
D. Huber
University of Hawaii
The University of Sydney
S. R. Kane
University of California at Riverside
J. P. de Leon
University of Tokyo
J. Lubin
University of California at Irvine (UCI)
M. G. MacDougall
University of California at Los Angeles
B. Massey
Villa’39 Observatory
D. Montes
Complutense University
M. Mori
University of Tokyo
H. Parviainen
Instituto de Astrofísica de Canarias
University of La Laguna
V. M. Passegger
University of Oklahoma
University of La Laguna
Instituto de Astrofísica de Canarias
A. S. Polanski
University of Kansas
P. Robertson
University of California at Irvine (UCI)
R. P. Schwarz
Harvard-Smithsonian Center for Astrophysics
G. Srdoc
Kotizarovci Observatory
H. M. Tabernero
Spanish National Research Council (CSIC)
A. Tanner
Mississippi State University
E. Turtelboom
University of California
J. Van Zandt
University of California at Los Angeles
L. Weiss
University of Notre Dame
M. Zechmeister
University of Göttingen
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 680 A76Subject Categories (SSIF 2011)
Astronomy, Astrophysics and Cosmology
DOI
10.1051/0004-6361/202347346