Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

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

Murgas, F. ; Castro-González, A. ; Pallé, E. ; Pozuelos, F. J. ; Millholland, S. ; Foo, O. ; Korth, J. LU ; Marfil, E. ; Amado, P. J. and Caballero, J. A. , et al. (2023) In Astronomy and Astrophysics 677.
Abstract

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... (More)

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.

(Less)
Please use this url to cite or link to this publication:
author
; ; ; ; ; ; ; ; and , et al. (More)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; and (Less)
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Planets and satellites: detection, Techniques: photometric, Techniques: radial velocities
in
Astronomy and Astrophysics
volume
677
article number
A182
publisher
EDP Sciences
external identifiers
  • scopus:85174158362
ISSN
0004-6361
DOI
10.1051/0004-6361/202346692
language
English
LU publication?
yes
id
8c9fcf28-eff4-4196-9ac6-312e8018ff86
date added to LUP
2024-01-12 09:21:56
date last changed
2024-01-12 09:23:20
@article{8c9fcf28-eff4-4196-9ac6-312e8018ff86,
  abstract     = {{<p>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, T<sub>eff</sub> = 3759 ± 87 K, V = 12.6 mag), with a stellar mass and radius of M<sub>∗</sub> = 0.44 ± 0.02 M<sub>·</sub> and R<sub>∗</sub> = 0.44 ± 0.02 R<sub>·</sub>, respectively. The planetary system is composed of two transiting planets: TOI-2095b, with an orbital period of P<sub>b</sub> = 17.66484 ± (7 A - 10<sup>- 5</sup>) days, and TOI-2095c, with P<sub>c</sub> = 28.17232 ± (14 A - 10<sup>- 5</sup>) days. Both planets have similar sizes with R<sub>b</sub> = 1.25 ± 0.07 R<sub>·</sub> and R<sub>c</sub> = 1.33 ± 0.08 R<sub>·</sub> 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 M<sub>b</sub> &lt; 4.1 M<sub>·</sub> for the inner and M<sub>c</sub> &lt; 7.4 M<sub>·</sub> 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.</p>}},
  author       = {{Murgas, F. and Castro-González, A. and Pallé, E. and Pozuelos, F. J. and Millholland, S. and Foo, O. and Korth, J. and Marfil, E. and Amado, P. J. and Caballero, J. A. and Christiansen, J. L. and Ciardi, D. R. and Collins, K. A. and Di Sora, M. and Fukui, A. and Gan, T. and Gonzales, E. J. and Henning, Th and Herrero, E. and Isopi, G. and Jenkins, J. M. and Lillo-Box, J. and Lodieu, N. and Luque, R. and Mallia, F. and Morales, J. C. and Morello, G. and Narita, N. and Orell-Miquel, J. and Parviainen, H. and Pérez-Torres, M. and Quirrenbach, A. and Reiners, A. and Ribas, I. and Safonov, B. S. and Seager, S. and Schwarz, R. P. and Schweitzer, A. and Schlecker, M. and Strakhov, I. A. and Vanaverbeke, S. and Watanabe, N. and Winn, J. N. and Zechmeister, M.}},
  issn         = {{0004-6361}},
  keywords     = {{Planets and satellites: detection; Techniques: photometric; Techniques: radial velocities}},
  language     = {{eng}},
  month        = {{09}},
  publisher    = {{EDP Sciences}},
  series       = {{Astronomy and Astrophysics}},
  title        = {{Two super-Earths at the edge of the habitable zone of the nearby M dwarf TOI-2095}},
  url          = {{http://dx.doi.org/10.1051/0004-6361/202346692}},
  doi          = {{10.1051/0004-6361/202346692}},
  volume       = {{677}},
  year         = {{2023}},
}