A hot sub-Neptune in the desert and a temperate super-Earth around faint M dwarfs Color validation of TOI-4479b and TOI-2081b
Journal article, 2022
Aims.
We report the discovery and validation of two TESS exoplanets orbiting faint M dwarfs: TOI-4479b and TOI-2081b.
Methods.
We jointly analyzed space (TESS mission) and ground-based (MuSCAT2, MuSCAT3 and SINISTRO instruments) light curves using our multicolor photometry transit analysis pipeline. This allowed us to compute contamination limits for both candidates and validate them as planet-sized companions. Results.
We found TOI-4479b to be a sub-Neptune-sized planet (R-p = 2.82(-0.63)(+0.65) R-circle plus) and TOI-2081b to be a super-Earth-sized planet (R-p = 2.04(-0.54)(+0.50) R-circle plus). Furthermore, we obtained that TOI-4479b, with a short orbital period of 1.15890(-0.00001)(+0.00002) days, lies within the Neptune desert and is in fact the largest nearly ultra-short period planet around an M dwarf known to date.
Conclusions.
These results make TOI-4479b rare among the currently known exoplanet population of M dwarf stars and an especially interesting target for spectroscopic follow-up and future studies of planet formation and evolution.
We report the discovery and validation of two TESS exoplanets orbiting faint M dwarfs: TOI-4479b and TOI-2081b.
Methods.
We jointly analyzed space (TESS mission) and ground-based (MuSCAT2, MuSCAT3 and SINISTRO instruments) light curves using our multicolor photometry transit analysis pipeline. This allowed us to compute contamination limits for both candidates and validate them as planet-sized companions. Results.
We found TOI-4479b to be a sub-Neptune-sized planet (R-p = 2.82(-0.63)(+0.65) R-circle plus) and TOI-2081b to be a super-Earth-sized planet (R-p = 2.04(-0.54)(+0.50) R-circle plus). Furthermore, we obtained that TOI-4479b, with a short orbital period of 1.15890(-0.00001)(+0.00002) days, lies within the Neptune desert and is in fact the largest nearly ultra-short period planet around an M dwarf known to date.
Conclusions.
These results make TOI-4479b rare among the currently known exoplanet population of M dwarf stars and an especially interesting target for spectroscopic follow-up and future studies of planet formation and evolution.
planets and satellites
TOI-2081b
observational
methods
photometric
planets and satellites
TOI-4479b
planets and satellites
detection
planets and satellites
individual
techniques
individual
general
Author
E. Esparza-Borges
University of La Laguna
Instituto de Astrofísica de Canarias
H. Parviainen
Instituto de Astrofísica de Canarias
University of La Laguna
F. Murgas
Instituto de Astrofísica de Canarias
University of La Laguna
E. Palle
Instituto de Astrofísica de Canarias
University of La Laguna
A. Maas
Heidelberg University
Giuseppe Morello
University of La Laguna
Instituto de Astrofísica de Canarias
M. R. Zapatero-Osorio
Spanish National Research Council (CSIC)
K. Barkaoui
Instituto de Astrofísica de Canarias
University of Liège
Massachusetts Institute of Technology (MIT)
N. Narita
Astrobiology Center, Japan
Instituto de Astrofísica de Canarias
University of Tokyo
A. Fukui
Instituto de Astrofísica de Canarias
University of Tokyo
N. Casasayas-Barris
Leiden University
M. Oshagh
Instituto de Astrofísica de Canarias
University of La Laguna
N. Crouzet
Leiden University
D. Galan
University of La Laguna
G. E. Fernandez
Instituto de Astrofísica de Canarias
T. Kagetani
University of Tokyo
K. Kawauchi
Instituto de Astrofísica de Canarias
University of La Laguna
T. Kodama
University of Tokyo
Judith Korth
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
N. Kusakabe
Astrobiology Center, Japan
National Astronomical Observatory of Japan
A. Laza-Ramos
Instituto de Astrofísica de Canarias
R. Luque
Spanish National Research Council (CSIC)
J. Livingston
University of Tokyo
National Astronomical Observatory of Japan
Astrobiology Center, Japan
A. Madrigal-Aguado
Instituto de Astrofísica de Canarias
M. Mori
University of Tokyo
J. Orell-Miquel
Instituto de Astrofísica de Canarias
University of La Laguna
M. Puig-Subira
Instituto de Astrofísica de Canarias
M. Stangret
University of La Laguna
Instituto de Astrofísica de Canarias
Y. Terada
Academia Sinica
National Taiwan University
N. Watanabe
University of Tokyo
Y. Zou
University of Tokyo
A. Baliga Savel
University of Maryland
A. A. Belinski
Moscow State University
K. Collins
Harvard-Smithsonian Center for Astrophysics
C. D. Dressing
University of California
S. Giacalone
University of California
H. Gill
University of California
Goliguzova
Moscow State University
M. Ikoma
National Astronomical Observatory of Japan
J. M. Jenkins
National Aeronautics and Space Administration (NASA)
M. Tamura
National Astronomical Observatory of Japan
Astrobiology Center, Japan
University of Tokyo
J. D. Twicken
National Aeronautics and Space Administration (NASA)
SETI Institute
G. R. Ricker
Massachusetts Institute of Technology (MIT)
R. P. Schwarz
Patashnick Voorheesville Observatory
S. Seager
Massachusetts Institute of Technology (MIT)
A. Shporer
Massachusetts Institute of Technology (MIT)
R. Vanderspek
Massachusetts Institute of Technology (MIT)
J. Winn
Princeton University
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 666 A10Subject Categories (SSIF 2011)
Aerospace Engineering
Astronomy, Astrophysics and Cosmology
Other Physics Topics
DOI
10.1051/0004-6361/202243731