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

E. Esparza-Borges, H. Parviainen, F. Murgas, E. Pallé, A. Maas, G. Morello, M. R. Zapatero-Osorio, K. Barkaoui, N. Narita, A. Fukui, N. Casasayas-Barris, M. Oshagh, N. Crouzet, D. Galán, G. E. Fernández, T. Kagetani, K. Kawauchi, T. Kodama, J. Korth, N. KusakabeA. Laza-Ramos, R. Luque, J. Livingston, A. Madrigal-Aguado, M. Mori, J. Orell-Miquel, M. Puig-Subirà, M. Stangret, Y. Terada, N. Watanabe, Y. Zou, A. Baliga Savel, A. A. Belinski, K. Collins, C. D. Dressing, S. Giacalone, H. Gill, M. V. Goliguzova, M. Ikoma, J. M. Jenkins, M. Tamura, J. D. Twicken, G. R. Ricker, R. P. Schwarz, S. Seager, A. Shporer, R. Vanderspek, J. Winn

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


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.

Original languageEnglish (US)
Article numberA10
JournalAstronomy and Astrophysics
StatePublished - Oct 1 2022

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • Methods: observational
  • Planets and satellites: detection
  • Planets and satellites: general
  • Planets and satellites: individual: TOI-2081b
  • Planets and satellites: individual: TOI-4479b
  • Techniques: photometric


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