ESPRESSO mass determination of TOI-263b: an extreme inhabitant of the brown dwarf desert

@article{Pall2021ESPRESSOMD,
  title={ESPRESSO mass determination of TOI-263b: an extreme inhabitant of the brown dwarf desert},
  author={Enric Pall{\'e} and Rafael Luque and Mar{\'i}a Rosa Zapatero Osorio and Hannu Parviainen and Masahiro Ikoma and H. M. Tabernero and Mathias Zechmeister and Alexander J. Mustill and V. J. S. B{\'e}jar and Norio Narita and Felipe Murgas},
  journal={Astronomy and Astrophysics},
  year={2021}
}
The TESS mission has reported a wealth of new planetary systems around bright and nearby stars amenable for detailed characterization of the planet properties and their atmospheres. However, not all interesting TESS planets orbit around bright host stars. TOI-263 b is a validated ultra-short period substellar object in a 0.56-day orbit around a faint (V = 18.97) M3.5 dwarf star. The substellar nature of TOI-263 b was explored using multi-color photometry, which determined a true radius of 0.87… 
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