The browser you are using is not supported by this website. All versions of Internet Explorer are no longer supported, either by us or Microsoft (read more here: https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Please use a modern browser to fully experience our website, such as the newest versions of Edge, Chrome, Firefox or Safari etc.

korth

Judith Korth

Postdoc

korth

Two super-Earths at the edge of the habitable zone of the nearby M dwarf TOI-2095

Author

  • F. Murgas
  • A. Castro-González
  • E. Pallé
  • F. J. Pozuelos
  • S. Millholland
  • O. Foo
  • J. Korth
  • E. Marfil
  • P. J. Amado
  • J. A. Caballero
  • J. L. Christiansen
  • D. R. Ciardi
  • K. A. Collins
  • M. Di Sora
  • A. Fukui
  • T. Gan
  • E. J. Gonzales
  • Th Henning
  • E. Herrero
  • G. Isopi
  • J. M. Jenkins
  • J. Lillo-Box
  • N. Lodieu
  • R. Luque
  • F. Mallia
  • J. C. Morales
  • G. Morello
  • N. Narita
  • J. Orell-Miquel
  • H. Parviainen
  • M. Pérez-Torres
  • A. Quirrenbach
  • A. Reiners
  • I. Ribas
  • B. S. Safonov
  • S. Seager
  • R. P. Schwarz
  • A. Schweitzer
  • M. Schlecker
  • I. A. Strakhov
  • S. Vanaverbeke
  • N. Watanabe
  • J. N. Winn
  • M. Zechmeister

Summary, in English

The main scientific goal of TESS is to find planets smaller than Neptune around stars that are bright enough to allow for further characterization studies. Given our current instrumentation and detection biases, M dwarfs are prime targets in the search for small planets that are in (or near) the habitable zone of their host star. In this work, we use photometric observations and CARMENES radial velocity (RV) measurements to validate a pair of transiting planet candidates found by TESS. The data were fitted simultaneously, using a Bayesian Markov chain Monte Carlo (MCMC) procedure and taking into account the stellar variability present in the photometric and spectroscopic time series. We confirm the planetary origin of the two transiting candidates orbiting around TOI-2095 (LSPM J1902+7525). The star is a nearby M dwarf (d = 41.90 ± 0.03 pc, Teff = 3759 ± 87 K, V = 12.6 mag), with a stellar mass and radius of M = 0.44 ± 0.02 M· and R = 0.44 ± 0.02 R·, respectively. The planetary system is composed of two transiting planets: TOI-2095b, with an orbital period of Pb = 17.66484 ± (7 A - 10- 5) days, and TOI-2095c, with Pc = 28.17232 ± (14 A - 10- 5) days. Both planets have similar sizes with Rb = 1.25 ± 0.07 R· and Rc = 1.33 ± 0.08 R· for planet b and planet c, respectively. Although we did not detect the induced RV variations of any planet with significance, our CARMENES data allow us to set stringent upper limits on the masses of these objects. We find Mb < 4.1 M· for the inner and Mc < 7.4 M· for the outer planet (95% confidence level). These two planets present equilibrium temperatures in the range of 300 350 K and are close to the inner edge of the habitable zone of their star.

Department/s

  • Astrophysics

Publishing year

2023-09-01

Language

English

Publication/Series

Astronomy and Astrophysics

Volume

677

Document type

Journal article

Publisher

EDP Sciences

Topic

  • Astronomy, Astrophysics and Cosmology

Keywords

  • Planets and satellites: detection
  • Techniques: photometric
  • Techniques: radial velocities

Status

Published

ISBN/ISSN/Other

  • ISSN: 0004-6361