A hot sub-Neptune in the desert and a temperate super-Earth around faint M dwarfs : Color validation of TOI-4479b and TOI-2081b
Summary, in English
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 (Rp = 2.82−0.63+0.65 R⊕) and TOI-2081b to be a super-Earth-sized planet (Rp = 2.04−0.54+0.50 R⊕). 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.
- Astronomy, Astrophysics and Cosmology
- Methods: observational
- Planets and satellites: detection
- Planets and satellites: general
- Planets and satellites: individual: TOI-2081b
- Planets and satellites: individual: TOI-4479b
- Techniques: photometric
- ISSN: 0004-6361