TOI-1468: A system of two transiting planets, a super-Earth and a mini-Neptune, on opposite sides of the radius valley
Journal article, 2022
We report the discovery and characterization of two small transiting planets orbiting the bright M3.0V star TOI-1468 (LSPM J0106+1913), whose transit signals were detected in the photometric time series in three sectors of the TESS mission. We confirm the planetary nature of both of them using precise radial velocity measurements from the CARMENES and MAROON-X spectrographs, and supplement them with ground-based transit photometry. A joint analysis of all these data reveals that the shorter-period planet, TOI-1468 b (P-b = 1.88 d), has a planetary mass of M-b = 3.21 +/- 0.24M(circle plus) and a radius of R-b = 1.280(-0.039)(+0.038) R-circle plus, resulting in a density of rho(b) = 8.39(-0.92)(+1.05) g cm(-3), which is consistent with a mostly rocky composition. For the outer planet, TOI-1468 c (P-c = 15.53 d), we derive a mass of M-c = 6.64(-0.68)(+0.67) M-circle plus,aradius of R-c = 2.06 +/- 0.04 R-circle plus, and a bulk density of rho(c) = 2.00(-0.19)(+0.21) g cm(-3), which corresponds to a rocky core composition with a H/He gas envelope. These planets are located on opposite sides of the radius valley, making our system an interesting discovery as there are only a handful of other systems with the same properties. This discovery can further help determine a more precise location of the radius valley for small planets around M dwarfs and, therefore, shed more light on planet formation and evolution scenarios.
techniques: radial velocities
stars: late-type
techniques: photometric
stars: individual: TOI-1468
Author
P. Chaturvedi
Thüringer Landessternwarte Tautenburg
P. Bluhm
Heidelberg University
E. Nagel
University of Hamburg
Thüringer Landessternwarte Tautenburg
A. P. Hatzes
Thüringer Landessternwarte Tautenburg
Giuseppe Morello
Instituto de Astrofísica de Canarias
University of La Laguna
M. Brady
University of Chicago
Judith Korth
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
K. Molaverdikhani
Exzellenzcluster Origins
Ludwig Maximilian University of Munich (LMU)
Heidelberg University
D. Kossakowski
Max Planck Society
J. A. Caballero
European Space Astronomy Centre (ESAC)
E. W. Guenther
Thüringer Landessternwarte Tautenburg
E. Palle
University of La Laguna
Instituto de Astrofísica de Canarias
N. Espinoza
Space Telescope Science Institute (STScI)
A. Seifahrt
University of Chicago
N. Lodieu
University of La Laguna
Instituto de Astrofísica de Canarias
C. Cifuentes
European Space Astronomy Centre (ESAC)
E. Furlan
California Institute of Technology (Caltech)
P. J. Amado
Spanish National Research Council (CSIC)
T. Barclay
University of Maryland
National Aeronautics and Space Administration (NASA)
J. Bean
University of Chicago
V. J. S. Bejar
Instituto de Astrofísica de Canarias
University of La Laguna
G. Bergond
CAHA- Centro Astronómico Hispano-Alemán
A. W. Boyle
California Institute of Technology (Caltech)
D. Ciardi
California Institute of Technology (Caltech)
K. A. Collins
Harvard-Smithsonian Center for Astrophysics
Collins
George Mason University
E. Esparza-Borges
Instituto de Astrofísica de Canarias
University of La Laguna
A. Fukui
Instituto de Astrofísica de Canarias
University of Tokyo
C. L. Gnilka
National Aeronautics and Space Administration (NASA)
R. Goeke
Massachusetts Institute of Technology (MIT)
P. Guerra
Albanyà Astronomical Observatory
Th Henning
Max Planck Society
E. Herrero
Spanish National Research Council (CSIC)
Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)
S. B. Howell
National Aeronautics and Space Administration (NASA)
Jeffers
Max Planck Society
J. M. Jenkins
National Aeronautics and Space Administration (NASA)
E. L. N. Jensen
Swarthmore College
D. Kasper
University of Chicago
T. Kodama
University of Tokyo
D. W. Latham
Harvard-Smithsonian Center for Astrophysics
M. J. Lopez-Gonzalez
Spanish National Research Council (CSIC)
R. Luque
University of Chicago
D. Montes
Complutense University
J. C. Morales
Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)
Spanish National Research Council (CSIC)
M. Mori
University of Tokyo
F. Murgas
Instituto de Astrofísica de Canarias
N. Narita
Astrobiology Center, Japan
University of Tokyo
Instituto de Astrofísica de Canarias
G. Nowak
Instituto de Astrofísica de Canarias
University of La Laguna
H. Parviainen
Instituto de Astrofísica de Canarias
University of La Laguna
V. M. Passegger
University of Oklahoma
University of Hamburg
A. Quirrenbach
Heidelberg University
S. Reffert
Heidelberg University
A. Reiners
University of Göttingen
I Ribas
Spanish National Research Council (CSIC)
Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)
G. R. Ricker
Massachusetts Institute of Technology (MIT)
E. Rodriguez
Spanish National Research Council (CSIC)
C. Rodriguez-Lopez
Spanish National Research Council (CSIC)
M. Schlecker
Max Planck Society
University of Arizona
R. P. Schwarz
Patashnick Voorheesville Observatory
A. Schweitzer
University of Hamburg
S. Seager
Massachusetts Institute of Technology (MIT)
G. Stefansson
Princeton University
C. Stockdale
Hazelwood Observatory
L. Tal-Or
Ariel University
University of Göttingen
J. D. Twicken
SETI Institute
National Aeronautics and Space Administration (NASA)
S. Vanaverbeke
KU Leuven
Vereniging vor Sterrenkunde
AstroLAB IRIS
G. Wang
Tsinghua International School
D. Watanabe
Planetary Discoveries
J. N. Winn
Princeton University
M. Zechmeister
University of Göttingen
Published in
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 666 art. no A155Categorizing
Subject Categories (SSIF 2011)
Astronomy, Astrophysics and Cosmology
Atom and Molecular Physics and Optics
Other Physics Topics
Identifiers
DOI
10.1051/0004-6361/202244056