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: photometric
stars: individual: TOI-1468
stars: late-type
techniques: radial velocities
Författare
P. Chaturvedi
Thüringer Landessternwarte Tautenburg
P. Bluhm
Universität Heidelberg
E. Nagel
Universität Hamburg
Thüringer Landessternwarte Tautenburg
A. P. Hatzes
Thüringer Landessternwarte Tautenburg
G. 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
Universität Heidelberg
Exzellenzcluster Origins
Ludwig-Maximilians-Universität München (LMU)
D. Kossakowski
Max-Planck-Gesellschaft
J. A. Caballero
European Space Astronomy Centre (ESAC)
E. W. Guenther
Thüringer Landessternwarte Tautenburg
E. Palle
Instituto de Astrofísica de Canarias
Universidad de la Laguna
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
Instituto de Astrofisica de Andalucía (IAA)
T. Barclay
NASA Goddard Space Flight Center
University of Maryland
J. Bean
University of Chicago
V. J. S. Bejar
Universidad de la Laguna
Instituto de Astrofísica de Canarias
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
NASA Ames Research Center
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)
Institut d'Estudis Espacials de Catalunya (IEEC)
S. B. Howell
NASA Ames Research Center
Jeffers
Max-Planck-Institut für Sonnensystemforschung
J. M. Jenkins
NASA Ames Research Center
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
Instituto de Astrofisica de Andalucía (IAA)
R. Luque
University of Chicago
D. Montes
Universidad Complutense de Madrid
J. C. Morales
Consejo Superior de Investigaciones Científicas (CSIC)
Institut d'Estudis Espacials de Catalunya (IEEC)
M. Mori
University of Tokyo
F. Murgas
Instituto de Astrofísica de Canarias
N. Narita
University of Tokyo
Instituto de Astrofísica de Canarias
Astrobiology Center, Japan
G. Nowak
Universidad de la Laguna
Instituto de Astrofísica de Canarias
H. Parviainen
Universidad de la Laguna
Instituto de Astrofísica de Canarias
V. M. Passegger
Universität Hamburg
University of Oklahoma
A. Quirrenbach
Universität Heidelberg
S. Reffert
Universität Heidelberg
A. Reiners
Georg-August-Universität Göttingen
I Ribas
Consejo Superior de Investigaciones Científicas (CSIC)
Institut d'Estudis Espacials de Catalunya (IEEC)
G. R. Ricker
Massachusetts Institute of Technology (MIT)
E. Rodriguez
Instituto de Astrofisica de Andalucía (IAA)
C. Rodriguez-Lopez
Instituto de Astrofisica de Andalucía (IAA)
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
NASA Ames Research Center
S. Vanaverbeke
KU Leuven
AstroLAB IRIS
Vereniging vor Sterrenkunde
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
Astronomi, astrofysik och kosmologi
Atom- och molekylfysik och optik
Annan fysik
DOI
10.1051/0004-6361/202244056