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Judith Korth



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. Kusakabe
  • A. 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

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.

Publishing year





Astronomy and Astrophysics



Document type

Journal article


EDP Sciences


  • 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