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TOI-2285b : A 1.7 Earth-radius planet near the habitable zone around a nearby M dwarf

Fukui, Akihiko ; Kimura, Tadahiro ; Hirano, Teruyuki ; Narita, Norio ; Kodama, Takanori ; Hori, Yasunori ; Ikoma, Masahiro ; Pallé, Enric ; Murgas, Felipe and Parviainen, Hannu , et al. (2022) In Publications of the Astronomical Society of Japan 74(1). p.1-8
Abstract

We report the discovery of TOI-2285b, a sub-Neptune-sized planet transiting a nearby (42 pc) M dwarf with a period of 27.3 d. We identified the transit signal from the Transiting Exoplanet Survey Satellite photometric data, which we confirmed with ground-based photometric observations using the multiband imagers MuSCAT2 and MuSCAT3. Combining these data with other follow-up observations including high-resolution spectroscopy with the Tillinghast Reflector Echelle Spectrograph, high-resolution imaging with the SPeckle Polarimeter, and radial velocity (RV) measurements with the InfraRed Doppler instrument, we find that the planet has a radius of 1.74 ± 0.08, R⊕, a mass of < 19.5 M⊕ (95% c.l.), and an insolation flux of 1.54 ± 0.14... (More)

We report the discovery of TOI-2285b, a sub-Neptune-sized planet transiting a nearby (42 pc) M dwarf with a period of 27.3 d. We identified the transit signal from the Transiting Exoplanet Survey Satellite photometric data, which we confirmed with ground-based photometric observations using the multiband imagers MuSCAT2 and MuSCAT3. Combining these data with other follow-up observations including high-resolution spectroscopy with the Tillinghast Reflector Echelle Spectrograph, high-resolution imaging with the SPeckle Polarimeter, and radial velocity (RV) measurements with the InfraRed Doppler instrument, we find that the planet has a radius of 1.74 ± 0.08, R⊕, a mass of < 19.5 M⊕ (95% c.l.), and an insolation flux of 1.54 ± 0.14 times that of the Earth. Although the planet resides just outside the habitable zone for a rocky planet, if the planet harbors an H2O layer under a hydrogen-rich atmosphere, then liquid water could exist on the surface of the H2O layer depending on the planetary mass and water mass fraction. The bright host star in the near-infrared (Ks = 9.0) makes this planet an excellent target for further RV and atmospheric observations to improve our understanding of the composition, formation, and habitability of sub-Neptune-sized planets.

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publishing date
type
Contribution to journal
publication status
published
keywords
planets and satellites: detection, planets and satellites: individual (TOI-2285b), planets and satellites: interiors, techniques: photometric, techniques: radial velocities
in
Publications of the Astronomical Society of Japan
volume
74
issue
1
pages
1 - 8
publisher
Oxford University Press
external identifiers
  • scopus:85127203937
ISSN
0004-6264
DOI
10.1093/pasj/psab106
language
English
LU publication?
no
additional info
Publisher Copyright: © 2021 The Author(s).
id
cde05dbf-8903-4efe-bb1e-b8ad2e87173a
date added to LUP
2023-02-01 09:34:15
date last changed
2023-02-10 03:19:57
@article{cde05dbf-8903-4efe-bb1e-b8ad2e87173a,
  abstract     = {{<p>We report the discovery of TOI-2285b, a sub-Neptune-sized planet transiting a nearby (42 pc) M dwarf with a period of 27.3 d. We identified the transit signal from the Transiting Exoplanet Survey Satellite photometric data, which we confirmed with ground-based photometric observations using the multiband imagers MuSCAT2 and MuSCAT3. Combining these data with other follow-up observations including high-resolution spectroscopy with the Tillinghast Reflector Echelle Spectrograph, high-resolution imaging with the SPeckle Polarimeter, and radial velocity (RV) measurements with the InfraRed Doppler instrument, we find that the planet has a radius of 1.74 ± 0.08, R⊕, a mass of &lt; 19.5 M⊕ (95% c.l.), and an insolation flux of 1.54 ± 0.14 times that of the Earth. Although the planet resides just outside the habitable zone for a rocky planet, if the planet harbors an H2O layer under a hydrogen-rich atmosphere, then liquid water could exist on the surface of the H2O layer depending on the planetary mass and water mass fraction. The bright host star in the near-infrared (Ks = 9.0) makes this planet an excellent target for further RV and atmospheric observations to improve our understanding of the composition, formation, and habitability of sub-Neptune-sized planets.</p>}},
  author       = {{Fukui, Akihiko and Kimura, Tadahiro and Hirano, Teruyuki and Narita, Norio and Kodama, Takanori and Hori, Yasunori and Ikoma, Masahiro and Pallé, Enric and Murgas, Felipe and Parviainen, Hannu and Kawauchi, Kiyoe and Mori, Mayuko and Esparza-Borges, Emma and Bieryla, Allyson and Irwin, Jonathan and Safonov, Boris S. and Stassun, Keivan G. and Alvarez-Hernandez, Leticia and Béjar, Víctor J.S. and Casasayas-Barris, Núria and Chen, Guo and Crouzet, Nicolas and De Leon, Jerome P. and Isogai, Keisuke and Kagetani, Taiki and Klagyivik, Peter and Korth, Judith and Kurita, Seiya and Kusakabe, Nobuhiko and Livingston, John and Luque, Rafael and Madrigal-Aguado, Alberto and Morello, Giuseppe and Nishiumi, Taku and Orell-Miquel, Jaume and Oshagh, Mahmoudreza and Śanchez-Benavente, Manuel and Stangret, Monika and Terada, Yuka and Watanabe, Noriharu and Zou, Yujie and Tamura, Motohide and Kurokawa, Takashi and Kuzuhara, Masayuki and Nishikawa, Jun and Omiya, Masashi and Vievard, Sébastien and Ueda, Akitoshi and Latham, David W. and Quinn, Samuel N. and Strakhov, Ivan S. and Belinski, Alexandr A. and Jenkins, Jon M. and Ricker, George R. and Seager, Sara and Vanderspek, Roland and Winn, Joshua N. and Charbonneau, David and Ciardi, David R. and Collins, Karen A. and Doty, John P. and Bachelet, Etienne and Harbeck, Daniel}},
  issn         = {{0004-6264}},
  keywords     = {{planets and satellites: detection; planets and satellites: individual (TOI-2285b); planets and satellites: interiors; techniques: photometric; techniques: radial velocities}},
  language     = {{eng}},
  month        = {{02}},
  number       = {{1}},
  pages        = {{1--8}},
  publisher    = {{Oxford University Press}},
  series       = {{Publications of the Astronomical Society of Japan}},
  title        = {{TOI-2285b : A 1.7 Earth-radius planet near the habitable zone around a nearby M dwarf}},
  url          = {{http://dx.doi.org/10.1093/pasj/psab106}},
  doi          = {{10.1093/pasj/psab106}},
  volume       = {{74}},
  year         = {{2022}},
}