TOI-2266 b: A keystone super-Earth at the edge of the M dwarf radius valley
Journal article, 2024
We validate the Transiting Exoplanet Survey Satellite (TESS) object of interest TOI-2266.01 (TIC 8348911) as a small transiting planet (most likely a super-Earth) orbiting a faint M5 dwarf (V = 16.54) on a 2.33 d orbit. The validation is based on an approach where multicolour transit light curves are used to robustly estimate the upper limit of the transiting object's radius. Our analysis uses SPOC-pipeline TESS light curves from Sectors 24, 25, 51, and 52, simultaneous multicolour transit photometry observed with MuSCAT2, MuSCAT3' and HiPERCAM, and additional transit photometry observed with the LCOGT telescopes. TOI-2266 b is found to be a planet with a radius of 1.54 ± 0.09 R, which locates it at the edge of the transition zone between rocky planets, water-rich planets, and sub-Neptunes (the so-called M dwarf radius valley). The planet is amenable to ground-based radial velocity mass measurement with red-sensitive spectrographs installed in large telescopes, such as MAROON-X and Keck Planet Finder (KPF), which makes it a valuable addition to a relatively small population of planets that can be used to probe the physics of the transition zone. Further, the planet's orbital period of 2.33 days places it inside a 'keystone planet'wedge in the period-radius plane where competing planet formation scenarios make conflicting predictions on how the radius valley depends on the orbital period. This makes the planet also a welcome addition to the small population of planets that can be used to test small-planet formation scenarios around M dwarfs.
Methods: statistical
Planets and satellites: general
Planets and satellites: terrestrial planets
Stars: individual: TIC 8348911
Techniques: photometric
Author
H. Parviainen
Instituto de Astrofísica de Canarias
University of La Laguna
F. Murgas
University of La Laguna
Instituto de Astrofísica de Canarias
E. Esparza-Borges
Instituto de Astrofísica de Canarias
University of La Laguna
A. Peláez-Torres
University of La Laguna
Instituto de Astrofísica de Canarias
Enric Palle
Instituto de Astrofísica de Canarias
University of La Laguna
R. Luque
University of Chicago
M. Zapatero-Osorio
Centro de Astrobiologia (CAB)
Judith Korth
Lund University
A. Fukui
University of Tokyo
Instituto de Astrofísica de Canarias
Norio Narita
National Institutes of Natural Sciences
Instituto de Astrofísica de Canarias
University of Tokyo
Karen A. Collins
Harvard-Smithsonian Center for Astrophysics
V. J. S. Bejar
Instituto de Astrofísica de Canarias
University of La Laguna
Giuseppe Morello
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
Instituto de Astrofísica de Canarias
M. Monelli
University of La Laguna
Instituto de Astrofísica de Canarias
N. Abreu Garcia
Instituto de Astrofísica de Canarias
University of La Laguna
Guo Chen
Chinese Academy of Sciences
N. Crouzet
Leiden University
Jerome P. De Leon
University of Tokyo
K. Isogai
Kyoto University
University of Tokyo
T. Kagetani
University of Tokyo
Kiyoe Kawauchi
College of Life Sciences
P. Klagyivik
Freie Universität Berlin
T. Kodama
University of Tokyo
Nobuhiko Kusakabe
National Astronomical Observatory of Japan
National Institutes of Natural Sciences
J.H. Livingston
National Institutes of Natural Sciences
National Astronomical Observatory of Japan
The Graduate University for Advanced Studies (SOKENDAI)
P. Meni
Instituto de Astrofísica de Canarias
University of La Laguna
Mayuko Mori
University of Tokyo
G. Nowak
University of La Laguna
Instituto de Astrofísica de Canarias
Nicolaus Copernicus University
M. Tamura
University of Tokyo
National Institutes of Natural Sciences
National Astronomical Observatory of Japan
Y. Terada
Academia Sinica
National Taiwan University
Noriharu Watanabe
University of Tokyo
D. R. Ciardi
National Aeronautics and Space Administration (NASA)
M. B. Lund
National Aeronautics and Space Administration (NASA)
Jessie L. Christiansen
National Aeronautics and Space Administration (NASA)
Courtney D. Dressing
University of California
S. Giacalone
University of California
A. B. Savel
University of Maryland
L. Hirsch
Stanford University
S. G. Parsons
University of Sheffield
P. Brown
Vanderbilt University
K. I. Collins
George Mason University
Khalid Barkaoui
University of La Laguna
Massachusetts Institute of Technology (MIT)
University of Liège
M. Timmermans
University of Liège
M. Ghachoui
Faculté des Sciences Semlalia
University of Liège
A. Soubkiou
University of Porto
Faculté des Sciences Semlalia
Z. Benkhaldoun
Faculté des Sciences Semlalia
S. McDermott
Protologic LLC
T. Pritchard
National Aeronautics and Space Administration (NASA)
Pamela Rowden
Royal Astronomical Society
S. Striegel
SETI Institute
Tianjun Gan
Tsinghua University
K. Horne
University of St Andrews
E. L.N. Jensen
Swarthmore College
R. Schwarz
Harvard-Smithsonian Center for Astrophysics
Avi Shporer
Massachusetts Institute of Technology (MIT)
G. Srdoc
Kotizarovci Observatory
S. Seager
Massachusetts Institute of Technology (MIT)
J. N. Winn
Princeton University
Jon M. Jenkins
SETI Institute
George R. Ricker
Massachusetts Institute of Technology (MIT)
Roland K. Vanderspek
Massachusetts Institute of Technology (MIT)
D. Dragomir
University of New Mexico
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 683 A170Subject Categories (SSIF 2011)
Astronomy, Astrophysics and Cosmology
DOI
10.1051/0004-6361/202347431