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Search: WFRF:(Hori M.) > (2020-2022) > Terada Y. > Validation and atmo...

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Validation and atmospheric exploration of the sub-Neptune TOI-2136b around a nearby M3 dwarf

Kawauchi, K. (author)
Instituto de Astrofísica de Canarias,Universidad de la Laguna,University of La Laguna
Murgas, F. (author)
Universidad de la Laguna,University of La Laguna,Instituto de Astrofísica de Canarias
Palle, E. (author)
Instituto de Astrofísica de Canarias,Universidad de la Laguna,University of La Laguna
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Narita, N. (author)
University of Tokyo, Japan,Astrobiology Center, Japan,Instituto de Astrofísica de Canarias,Japan Science and Technology Agency (JST)
Fukui, A. (author)
University of Tokyo, Japan,Instituto de Astrofísica de Canarias
Hirano, T. (author)
National Astronomical Observatory of Japan,Astrobiology Center, Japan
Parviainen, H. (author)
Instituto de Astrofísica de Canarias,Universidad de la Laguna,University of La Laguna
Ishikawa, H. T. (author)
National Astronomical Observatory of Japan,Astrobiology Center, Japan
Watanabe, N. (author)
University of Tokyo, Japan
Esparaza-Borges, E. (author)
Instituto de Astrofísica de Canarias,Universidad de la Laguna,University of La Laguna
Kuzuhara, M. (author)
Astrobiology Center, Japan,National Astronomical Observatory of Japan
Orell-Miquel, J. (author)
Universidad de la Laguna,University of La Laguna,Instituto de Astrofísica de Canarias
Krishnamurthy, V (author)
Astrobiology Center, Japan,National Astronomical Observatory of Japan
Mori, M. (author)
University of Tokyo, Japan
Kagetani, T. (author)
University of Tokyo, Japan
Zou, Y. (author)
University of Tokyo, Japan
Isogai, K. (author)
University of Tokyo, Japan,Kyoto University
Livingston, J. H. (author)
University of Tokyo, Japan,Astrobiology Center, Japan,National Astronomical Observatory of Japan
Howell, S. B. (author)
NASA Ames Research Center
Crouzet, N. (author)
European Space Agency (ESA)
de Leon, J. P. (author)
University of Tokyo, Japan
Kimura, T. (author)
University of Tokyo, Japan
Kodama, T. (author)
University of Tokyo, Japan
Korth, Judith, 1987 (author)
Chalmers tekniska högskola,Chalmers University of Technology
Kurita, S. (author)
University of Tokyo, Japan
Laza-Ramos, A. (author)
Instituto de Astrofísica de Canarias
Luque, R. (author)
Instituto de Astrofisica de Andalucía (IAA),Institute of Astrophysics of Andalusia (IAA)
Madrigal-Aguado, A. (author)
Universidad de la Laguna,University of La Laguna,Instituto de Astrofísica de Canarias
Miyakawa, K. (author)
Tokyo Institute of Technology
Morello, G. (author)
Universidad de la Laguna,University of La Laguna,Instituto de Astrofísica de Canarias
Nishiumi, T. (author)
University of Tokyo, Japan,The Graduate University for Advanced Studies (SOKENDAI),Astrobiology Center, Japan
Rodriguez, G. E. F. (author)
Instituto de Astrofísica de Canarias
Sanchez-Benavente, M. (author)
Instituto de Astrofísica de Canarias,Universidad de la Laguna,University of La Laguna
Stangret, M. (author)
Universidad de la Laguna,University of La Laguna,Instituto de Astrofísica de Canarias
Teng, H. (author)
Tokyo Institute of Technology
Terada, Y. (author)
Academia Sinica Taiwan,National Taiwan University
Gnilka, C. L. (author)
NASA Ames Research Center,California Institute of Technology (Caltech)
Guerrero, N. (author)
Massachusetts Institute of Technology (MIT),University of Florida
Harakawa, H. (author)
National Astronomical Observatory of Japan
Hodapp, K. (author)
University of Hawaii
Hori, Y. (author)
National Astronomical Observatory of Japan,Astrobiology Center, Japan
Ikoma, M. (author)
National Astronomical Observatory of Japan
Jacobson, S. (author)
University of Hawaii
Konishi, M. (author)
Oita University
Kotani, T. (author)
Astrobiology Center, Japan,The Graduate University for Advanced Studies (SOKENDAI),National Astronomical Observatory of Japan
Kudo, T. (author)
National Astronomical Observatory of Japan
Kurokowa, T. (author)
Tokyo University of Agriculture and Technology,Astrobiology Center, Japan
Kusakabe, N. (author)
Astrobiology Center, Japan,National Astronomical Observatory of Japan
Nishikawa, J. (author)
Astrobiology Center, Japan,National Astronomical Observatory of Japan,The Graduate University for Advanced Studies (SOKENDAI)
Omiya, M. (author)
National Astronomical Observatory of Japan,Astrobiology Center, Japan
Serizawa, T. (author)
Tokyo University of Agriculture and Technology,National Astronomical Observatory of Japan
Tamura, M. (author)
University of Tokyo, Japan,National Astronomical Observatory of Japan,Astrobiology Center, Japan
Ueda, A. (author)
The Graduate University for Advanced Studies (SOKENDAI),National Astronomical Observatory of Japan,Astrobiology Center, Japan
Vievard, S. (author)
Astrobiology Center, Japan,National Astronomical Observatory of Japan
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 (creator_code:org_t)
2022-09-27
2022
English.
In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 666
Related links:
https://research.cha... (primary) (free)
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https://doi.org/10.1...
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  • Journal article (peer-reviewed)
Abstract Subject headings
Close  
  • Context. The NASA space telescope TESS is currently in the extended mission of its all-sky search for new transiting planets. Of the thousands of candidates that TESS is expected to deliver, transiting planets orbiting nearby M dwarfs are particularly interesting targets since they provide a great opportunity to characterize their atmospheres by transmission spectroscopy. Aims. We aim to validate and characterize the new sub-Neptune-sized planet candidate TOI-2136.01 orbiting a nearby M dwarf (d = 33.36 +/- 0.02 pc, T-eff = 3373 +/- 108 K) with an orbital period of 7.852 days. Methods. We use TESS data, ground-based multicolor photometry, and radial velocity measurements with the InfraRed Doppler (IRD) instrument on the Subaru Telescope to validate the planetary nature of TOI-2136.01, and estimate the stellar and planetary parameters. We also conduct high-resolution transmission spectroscopy to search for helium in its atmosphere. Results. We confirm that TOI-2136.01 (now named TOI-2136b) is a bona fide planet with a planetary radius of R-p = 2.20 +/- 0.07 R-circle plus and a mass of M-p = 4.7(-2.6)(+3.1) M-circle plus. We also search for helium 10830 angstrom absorption lines and place an upper limit on the equivalent width of <7.8 m angstrom and on the absorption signal of <1.44% with 95% confidence. Conclusions. TOI-2136b is a sub-Neptune transiting a nearby and bright star (J = 10.8 mag), and is a potentially hycean planet, which is a new class of habitable planets with large oceans under a H-2-rich atmosphere, making it an excellent target for atmospheric studies to understand the formation, evolution, and habitability of the small planets.

Subject headings

NATURVETENSKAP  -- Geovetenskap och miljövetenskap -- Meteorologi och atmosfärforskning (hsv//swe)
NATURAL SCIENCES  -- Earth and Related Environmental Sciences -- Meteorology and Atmospheric Sciences (hsv//eng)
NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
NATURVETENSKAP  -- Geovetenskap och miljövetenskap -- Geofysik (hsv//swe)
NATURAL SCIENCES  -- Earth and Related Environmental Sciences -- Geophysics (hsv//eng)

Keyword

planets and satellites: individual: TOI-2136b
techniques: photometric
planets and satellites: atmospheres
techniques: radial velocities
planets and satellites: detection

Publication and Content Type

art (subject category)
ref (subject category)

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