TOI-1468: A system of two transiting planets, a super-Earth and a mini-Neptune, on opposite sides of the radius valley
Artikel i vetenskaplig tidskrift, 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
Författare
P. Chaturvedi
Thüringer Landessternwarte Tautenburg
P. Bluhm
Universität Heidelberg
E. Nagel
Universität Hamburg
Thüringer Landessternwarte Tautenburg
A. P. Hatzes
Thüringer Landessternwarte Tautenburg
Giuseppe Morello
Instituto de Astrofísica de Canarias
Universidad de la Laguna
M. Brady
University of Chicago
Judith Korth
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
K. Molaverdikhani
Exzellenzcluster Origins
Ludwig-Maximilians-Universität München (LMU)
Universität Heidelberg
D. Kossakowski
Max-Planck-Gesellschaft
J. A. Caballero
European Space Astronomy Centre (ESAC)
E. W. Guenther
Thüringer Landessternwarte Tautenburg
E. Palle
Universidad de la Laguna
Instituto de Astrofísica de Canarias
N. Espinoza
Space Telescope Science Institute (STScI)
A. Seifahrt
University of Chicago
N. Lodieu
Universidad de la Laguna
Instituto de Astrofísica de Canarias
C. Cifuentes
European Space Astronomy Centre (ESAC)
E. Furlan
California Institute of Technology (Caltech)
P. J. Amado
Consejo Superior de Investigaciones Científicas (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
Universidad de la Laguna
G. Bergond
CAHA - Centro Astronómico hispano Alemán, A.I.E.
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
Universidad de 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
Observatori Astronòmic Albanya
Th Henning
Max-Planck-Gesellschaft
E. Herrero
Consejo Superior de Investigaciones Científicas (CSIC)
Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)
S. B. Howell
National Aeronautics and Space Administration (NASA)
Jeffers
Max-Planck-Gesellschaft
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
Consejo Superior de Investigaciones Científicas (CSIC)
R. Luque
University of Chicago
D. Montes
Universidad Complutense de Madrid
J. C. Morales
Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)
Consejo Superior de Investigaciones Científicas (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
Universidad de la Laguna
H. Parviainen
Instituto de Astrofísica de Canarias
Universidad de la Laguna
V. M. Passegger
University of Oklahoma
Universität Hamburg
A. Quirrenbach
Universität Heidelberg
S. Reffert
Universität Heidelberg
A. Reiners
Georg-August-Universität Göttingen
I Ribas
Consejo Superior de Investigaciones Científicas (CSIC)
Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)
G. R. Ricker
Massachusetts Institute of Technology (MIT)
E. Rodriguez
Consejo Superior de Investigaciones Científicas (CSIC)
C. Rodriguez-Lopez
Consejo Superior de Investigaciones Científicas (CSIC)
M. Schlecker
Max-Planck-Gesellschaft
University of Arizona
R. P. Schwarz
Patashnick Voorheesville Observatory
A. Schweitzer
Universität Hamburg
S. Seager
Massachusetts Institute of Technology (MIT)
G. Stefansson
Princeton University
C. Stockdale
Hazelwood Observatory
L. Tal-Or
Ariel University
Georg-August-Universität 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
Georg-August-Universität Göttingen
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 666 A155Ämneskategorier (SSIF 2011)
Astronomi, astrofysik och kosmologi
Atom- och molekylfysik och optik
Annan fysik
DOI
10.1051/0004-6361/202244056