TOI-1801 b: A temperate mini-Neptune around a young M0.5 dwarf
Artikel i vetenskaplig tidskrift, 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: radial velocities
stars: low-mass
planets and satellites: atmospheres
planetary systems
techniques: spectroscopic
planets and satellites: individual: TOI-1801
Författare
M. Mallorquin
Instituto de Astrofísica de Canarias
Universidad de la Laguna
E. Goffo
Universita degli Studi di Torino
Thüringer Landessternwarte Tautenburg
E. Palle
Universidad de la Laguna
Instituto de Astrofísica de Canarias
N. Lodieu
Instituto de Astrofísica de Canarias
Universidad de la Laguna
V. J. S. Bejar
Universidad de la Laguna
Instituto de Astrofísica de Canarias
H. Isaacson
University of California
M. R. Zapatero Osorio
Consejo Superior de Investigaciones Científicas (CSIC)
S. Dreizler
Georg-August-Universität Göttingen
S. Stock
Universität Heidelberg
R. Luque
University of Chicago
F. Murgas
Universidad de la Laguna
Instituto de Astrofísica de Canarias
L. Pena
Consejo Superior de Investigaciones Científicas (CSIC)
J. Sanz-Forcada
Consejo Superior de Investigaciones Científicas (CSIC)
Giuseppe Morello
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
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
AstroLAB IRIS
Vereniging Voor Sterrenkunde (VVS)
P. Plavchan
George Mason University
N. Narita
University of Tokyo
Instituto de Astrofísica de Canarias
Astrobiology Center, Japan
A. Schweitzer
Hamburger Sternwarte
M. Perez-Torres
Consejo Superior de Investigaciones Científicas (CSIC)
A. Quirrenbach
Universität Heidelberg
J. Kemmer
Universität Heidelberg
A. P. Hatzes
Thüringer Landessternwarte Tautenburg
A. Howard
University of California
M. Schlecker
University of Arizona
S. Reffert
Universität Heidelberg
E. Nagel
Georg-August-Universität Göttingen
J. C. Morales
Consejo Superior de Investigaciones Científicas (CSIC)
Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)
J. Orell-Miquel
Instituto de Astrofísica de Canarias
Universidad de la Laguna
C. Duque-Arribas
Universidad Complutense de Madrid
I. Carleo
Universidad de la Laguna
Instituto de Astrofísica de Canarias
C. Cifuentes
Consejo Superior de Investigaciones Científicas (CSIC)
G. Nowak
Instituto de Astrofísica de Canarias
Uniwersytet Mikolaja Kopernika
Universidad de la Laguna
I. Ribas
Consejo Superior de Investigaciones Científicas (CSIC)
Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)
A. Reiners
Georg-August-Universität Göttingen
P. J. Amado
Consejo Superior de Investigaciones Científicas (CSIC)
J. A. Caballero
Consejo Superior de Investigaciones Científicas (CSIC)
Th. Henning
Max-Planck-Gesellschaft
V. Pinter
Calar Alto Astronomical Observatory
J. M. Akana Murphy
University of California
C. Beard
University of California
S. Blunt
California Institute of Technology (Caltech)
C. L. Brinkman
University of California
University of Hawaii
B. Cale
California Institute of Technology (Caltech)
A. Chontos
Princeton University
University of Hawaii
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
S. Dufoer
Vereniging Voor Sterrenkunde (VVS)
M. El Mufti
George Mason University
N. Espinoza
Space Telescope Science Institute (STScI)
T. Fetherolf
University of California
A. Fukui
Instituto de Astrofísica de Canarias
University of Tokyo
S. Giacalone
University of California
C. Gnilka
National Aeronautics and Space Administration (NASA)
E. Gonzales
University of California
S. K. Grunblatt
Johns Hopkins University
S. Howell
National Aeronautics and Space Administration (NASA)
D. Huber
The University of Sydney
University of Hawaii
S. R. Kane
University of California
J. P. de Leon
University of Tokyo
J. Lubin
University of California
M. G. MacDougall
University of California
B. Massey
Villa’39 Observatory
D. Montes
Universidad Complutense de Madrid
M. Mori
University of Tokyo
H. Parviainen
Instituto de Astrofísica de Canarias
Universidad de la Laguna
V. M. Passegger
Universidad de la Laguna
Instituto de Astrofísica de Canarias
University of Oklahoma
A. S. Polanski
University of Kansas
P. Robertson
University of California
R. P. Schwarz
Harvard-Smithsonian Center for Astrophysics
G. Srdoc
Kotizarovci Observatory
H. M. Tabernero
Consejo Superior de Investigaciones Científicas (CSIC)
A. Tanner
Mississippi State University
E. Turtelboom
University of California
J. Van Zandt
University of California
L. Weiss
University of Notre Dame
M. Zechmeister
Georg-August-Universität Göttingen
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 680 A76Ämneskategorier (SSIF 2011)
Astronomi, astrofysik och kosmologi
DOI
10.1051/0004-6361/202347346