A hot sub-Neptune in the desert and a temperate super-Earth around faint M dwarfs. Color validation of TOI-4479b and TOI-2081b

DOI: 
10.1051/0004-6361/202243731
Publication date: 
08/10/2022
Main author: 
Esparza-Borges, E.
IAA authors: 
Luque, R.
Authors: 
Esparza-Borges, E.;Parviainen, H.;Murgas, F.;Pallé, E.;Maas, A.;Morello, G.;Zapatero-Osorio, M. R.;Barkaoui, K.;Narita, N.;Fukui, A.;Casasayas-Barris, N.;Oshagh, M.;Crouzet, N.;Galán, D.;Fernández, G. E.;Kagetani, T.;Kawauchi, K.;Kodama, T.;Korth, J.;Kusakabe, N.;Laza-Ramos, A.;Luque, R.;Livingston, J.;Madrigal-Aguado, A.;Mori, M.;Orell-Miquel, J.;Puig-Subirà, M.;Stangret, M.;Terada, Y.;Watanabe, N.;Zou, Y.;Baliga Savel, A.;Belinski, A. A.;Collins, K.;Dressing, C. D.;Giacalone, S.;Gill, H.;Goliguzova, M. V.;Ikoma, M.;Jenkins, J. M.;Tamura, M.;Twicken, J. D.;Ricker, G. R.;Schwarz, R. P.;Seager, S.;Shporer, A.;Vanderspek, R.;Winn, J.
Journal: 
Astronomy and Astrophysics
Publication type: 
Article
Volume: 
666
Pages: 
A10
Abstract: 
<BR /> Aims: We report the discovery and validation of two TESS exoplanets orbiting faint M dwarfs: TOI-4479b and TOI-2081b. <BR /> 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. <BR /> Results: We found TOI-4479b to be a sub-Neptune-sized planet (R<SUB>p</SUB> = 2.82<SUB>−0.63</SUB><SUP>+0.65</SUP> R<SUB>⊕</SUB>) and TOI-2081b to be a super-Earth-sized planet (R<SUB>p</SUB> = 2.04<SUB>−0.54</SUB><SUP>+0.50</SUP> R<SUB>⊕</SUB>). Furthermore, we obtained that TOI-4479b, with a short orbital period of 1.15890<SUB>−0.00001</SUB><SUP>+0.00002</SUP> days, lies within the Neptune desert and is in fact the largest nearly ultra-short period planet around an M dwarf known to date. <BR /> 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.
Database: 
ADS
SCOPUS
URL: 
https://ui.adsabs.harvard.edu/#abs/2022A&A...666A..10E/abstract
ADS Bibcode: 
2022A&A...666A..10E
Keywords: 
planets and satellites: individual: TOI-4479b;planets and satellites: individual: TOI-2081b;methods: observational;techniques: photometric;planets and satellites: general;planets and satellites: detection;Astrophysics - Earth and Planetary Astrophysics;Astrophysics - Solar and Stellar Astrophysics