TOI-1452 b: SPIRou and TESS Reveal a Super-Earth in a Temperate Orbit Transiting an M4 Dwarf - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles The Astronomical Journal Year : 2022

TOI-1452 b: SPIRou and TESS Reveal a Super-Earth in a Temperate Orbit Transiting an M4 Dwarf

Charles Cadieux
  • Function : Author
René Doyon
  • Function : Author
Mykhaylo Plotnykov
  • Function : Author
Farbod Jahandar
  • Function : Author
Étienne Artigau
  • Function : Author
Diana Valencia
  • Function : Author
Neil J. Cook
  • Function : Author
Thomas Vandal
  • Function : Author
Ryan Cloutier
  • Function : Author
Norio Narita
  • Function : Author
Akihiko Fukui
  • Function : Author
Teruyuki Hirano
  • Function : Author
François Bouchy
Nicolas B. Cowan
  • Function : Author
Erica J. Gonzales
  • Function : Author
David R. Ciardi
  • Function : Author
Keivan G. Stassun
  • Function : Author
Björn Benneke
  • Function : Author
João Gomes da Silva
  • Function : Author
Jon M. Jenkins
  • Function : Author
Ágnes Kóspál
  • Function : Author
David Lafrenière
  • Function : Author
Jorge H. C. Martins
  • Function : Author
J. -D. Do Nascimento
  • Function : Author
Stefan Pelletier
  • Function : Author
Joseph D. Twicken
  • Function : Author
Luke G. Bouma
  • Function : Author
Scott Cartwright
  • Function : Author
Antoine Darveau-Bernier
  • Function : Author
Konstantin Grankin
  • Function : Author
Masahiro Ikoma
  • Function : Author
Taiki Kagetani
  • Function : Author
Kiyoe Kawauchi
  • Function : Author
Takanori Kodama
  • Function : Author
Takayuki Kotani
  • Function : Author
David W. Latham
  • Function : Author
Kristen Menou
  • Function : Author
George Ricker
  • Function : Author
Sara Seager
  • Function : Author
Motohide Tamura
  • Function : Author
Roland Vanderspek
  • Function : Author
Noriharu Watanabe
  • Function : Author

Abstract

Exploring the properties of exoplanets near or inside the radius valley provides insight on the transition from the rocky super-Earths to the larger, hydrogen-rich atmosphere mini-Neptunes. Here, we report the discovery of TOI-1452b, a transiting super-Earth (R p = 1.67 ± 0.07 R ) in an 11.1 day temperate orbit (T eq = 326 ± 7 K) around the primary member (H = 10.0, T eff = 3185 ± 50 K) of a nearby visual-binary M dwarf. The transits were first detected by the Transiting Exoplanet Survey Satellite, then successfully isolated between the two 3.″2 companions with ground-based photometry from the Observatoire du Mont-Mégantic and MuSCAT3. The planetary nature of TOI-1452b was established through high-precision velocimetry with the near-infrared SPIRou spectropolarimeter as part of the ongoing SPIRou Legacy Survey. The measured planetary mass (4.8 ± 1.3 M ) and inferred bulk density ( ${5.6}_{-1.6}^{+1.8}$ g cm-3) is suggestive of a rocky core surrounded by a volatile-rich envelope. More quantitatively, the mass and radius of TOI-1452b, combined with the stellar abundance of refractory elements (Fe, Mg, and Si) measured by SPIRou, is consistent with a core-mass fraction of 18% ± 6% and a water-mass fraction of ${22}_{-13}^{+21}$ %. The water world candidate TOI-1452b is a prime target for future atmospheric characterization with JWST, featuring a transmission spectroscopy metric similar to other well-known temperate small planets such as LHS 1140b and K2-18 b. The system is located near Webb's northern continuous viewing zone, implying that is can be followed at almost any moment of the year.
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Dates and versions

insu-03780745 , version 1 (19-09-2022)

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Charles Cadieux, René Doyon, Mykhaylo Plotnykov, Guillaume Hébrard, Farbod Jahandar, et al.. TOI-1452 b: SPIRou and TESS Reveal a Super-Earth in a Temperate Orbit Transiting an M4 Dwarf. The Astronomical Journal, 2022, 164 (3), pp.96. ⟨10.3847/1538-3881/ac7cea⟩. ⟨insu-03780745⟩
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