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.
detection
individual
photometric
individual
planets and satellites
TOI-2081b
general
planets and satellites
TOI-4479b
observational
techniques
planets and satellites
methods
planets and satellites
Author
E. Esparza-Borges
University of La Laguna
Instituto de Astrofísica de Canarias
H. Parviainen
University of La Laguna
Instituto de Astrofísica de Canarias
F. Murgas
University of La Laguna
Instituto de Astrofísica de Canarias
E. Palle
University of La Laguna
Instituto de Astrofísica de Canarias
A. Maas
Heidelberg University
G. Morello
University of La Laguna
Instituto de Astrofísica de Canarias
M. R. Zapatero-Osorio
Spanish Astrobiology Center (INTA-CSIC)
K. Barkaoui
Massachusetts Institute of Technology (MIT)
Instituto de Astrofísica de Canarias
University of Liège
N. Narita
University of Tokyo
Astrobiology Center, Japan
Instituto de Astrofísica de Canarias
A. Fukui
University of Tokyo
Instituto de Astrofísica de Canarias
N. Casasayas-Barris
Leiden University
M. Oshagh
University of La Laguna
Instituto de Astrofísica de Canarias
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
University of La Laguna
Instituto de Astrofísica de Canarias
T. Kodama
University of Tokyo
Judith Korth
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
N. Kusakabe
National Astronomical Observatory of Japan
Astrobiology Center, Japan
A. Laza-Ramos
Instituto de Astrofísica de Canarias
R. Luque
Institute of Astrophysics of Andalusia (IAA)
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
University of La Laguna
Instituto de Astrofísica de Canarias
M. Puig-Subira
Instituto de Astrofísica de Canarias
M. Stangret
Instituto de Astrofísica de Canarias
University of La Laguna
Y. Terada
National Taiwan University
Academia Sinica
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 at Berkeley
S. Giacalone
University of California at Berkeley
H. Gill
University of California at Berkeley
Goliguzova
Moscow State University
M. Ikoma
National Astronomical Observatory of Japan
J. M. Jenkins
NASA Ames Research Center
M. Tamura
Astrobiology Center, Japan
University of Tokyo
National Astronomical Observatory of Japan
J. D. Twicken
NASA Ames Research Center
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
Aerospace Engineering
Astronomy, Astrophysics and Cosmology
Other Physics Topics
DOI
10.1051/0004-6361/202243731