A hot sub-Neptune in the desert and a temperate super-Earth around faint M dwarfs. Color validation of TOI-4479b and TOI-2081b
Tamura, M.; Pallé, E.; Korth, J.; Narita, N.; Casasayas-Barris, N.; Stangret, M.; Jenkins, J. M.; Luque, R.; Ricker, G. R.; Seager, S.; Twicken, J. D.; Oshagh, M.; Kodama, T.; Barkaoui, K.; Schwarz, R. P.; Vanderspek, R.; Winn, J.; Morello, G.; Esparza-Borges, E.; Murgas, F.; Fukui, A.; Crouzet, N.; Parviainen, H.; Watanabe, N.; Kusakabe, N.; Mori, M.; Terada, Y.; Orell-Miquel, J.; Giacalone, S.; Zou, Y.; Livingston, J.; Shporer, A.; Dressing, C. D.; Laza-Ramos, A.; Kawauchi, K.; Kagetani, T.; Madrigal-Aguado, A.; Ikoma, M.; Zapatero-Osorio, M. R.; Belinski, A. A.; Goliguzova, M. V.; Collins, K.; Maas, A.; Galán, D.; Fernández, G. E.; Puig-Subirà, M.; Baliga Savel, A.; Gill, H.
Spain, Germany, Belgium, United States, Japan, Netherlands, Sweden, Taiwan, Russia
Abstract
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.