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An Earth-sized Planet around an M5 Dwarf Star at 22 pc

Hirano, T. (author)
The Graduate University for Advanced Studies (SOKENDAI),National Institutes of Natural Sciences (NINS),National Astronomical Observatory of Japan
Dai, Fei (author)
California Institute of Technology (Caltech)
Livingston, J. (author)
National Institutes of Natural Sciences (NINS),The Graduate University for Advanced Studies (SOKENDAI),National Astronomical Observatory of Japan
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Grziwa, S. (author)
Universität zu Köln,University of Cologne
Lam, K. W.F. (author)
Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR)
Kasagi, Yui (author)
National Astronomical Observatory of Japan,The Graduate University for Advanced Studies (SOKENDAI)
Narita, N. (author)
University of Tokyo, Japan,Instituto de Astrofísica de Canarias,National Institutes of Natural Sciences (NINS)
Ishikawa, Hiroyuki Tako (author)
National Astronomical Observatory of Japan,National Institutes of Natural Sciences (NINS)
Miyakawa, Kohei (author)
National Astronomical Observatory of Japan
Serrano, L. M. (author)
Universita degli Studi di Torino,University of Turin
Matsumoto, Yuji (author)
National Astronomical Observatory of Japan
Kokubo, Eiichiro (author)
National Astronomical Observatory of Japan
Kimura, Tadahiro (author)
University of Tokyo, Japan
Ikoma, Masahiro (author)
University of Tokyo, Japan,National Astronomical Observatory of Japan
Winn, J. N. (author)
Princeton University
Wisniewski, John P. (author)
George Mason University
Harakawa, Hiroki (author)
National Astronomical Observatory of Japan
Teng, Huan Yu (author)
Tokyo Institute of Technology
Cochran, W. D. (author)
The University of Texas at Austin, USA
Fukui, A. (author)
University of Tokyo, Japan,Instituto de Astrofísica de Canarias
Gandolfi, D. (author)
Universita degli Studi di Torino,University of Turin
Guenther, Eike W. (author)
Thüringer Landessternwarte Tautenburg
Hori, Yasunori (author)
The Graduate University for Advanced Studies (SOKENDAI),National Astronomical Observatory of Japan,National Institutes of Natural Sciences (NINS)
Ikuta, Kai (author)
University of Tokyo, Japan
Kawauchi, Kiyoe (author)
University of Tokyo, Japan
Knudstrup, E. (author)
Århus Universitet,Aarhus University
Korth, Judith, 1987 (author)
Chalmers tekniska högskola,Chalmers University of Technology
Kotani, Takayuki (author)
National Astronomical Observatory of Japan,National Institutes of Natural Sciences (NINS),The Graduate University for Advanced Studies (SOKENDAI)
Krishnamurthy, Vigneshwaran (author)
National Astronomical Observatory of Japan,National Institutes of Natural Sciences (NINS)
Kudo, Tomoyuki (author)
National Astronomical Observatory of Japan
Kurokawa, Takashi (author)
Tokyo University of Agriculture and Technology,National Institutes of Natural Sciences (NINS)
Kuzuhara, M. (author)
National Institutes of Natural Sciences (NINS),National Astronomical Observatory of Japan
Luque, R. (author)
University of Chicago
Mori, Mayuko (author)
University of Tokyo, Japan
Nishikawa, Jun (author)
National Institutes of Natural Sciences (NINS),National Astronomical Observatory of Japan,The Graduate University for Advanced Studies (SOKENDAI)
Omiya, Masashi (author)
National Astronomical Observatory of Japan,National Institutes of Natural Sciences (NINS)
Orell-Miquel, J. (author)
Instituto de Astrofísica de Canarias,Universidad de la Laguna,University of La Laguna
Palle, E. (author)
Universidad de la Laguna,University of La Laguna,Instituto de Astrofísica de Canarias
Persson, C. M. (author)
Redfield, S. (author)
Wesleyan University
Serabyn, E. (author)
Smith, Alexis M.S. (author)
Takahashi, Aoi (author)
National Institutes of Natural Sciences (NINS),National Astronomical Observatory of Japan
Takarada, Takuya (author)
National Institutes of Natural Sciences (NINS),National Astronomical Observatory of Japan
Ueda, Akitoshi (author)
National Astronomical Observatory of Japan
Van Eylen, Vincent (author)
Vievard, Sébastien (author)
National Astronomical Observatory of Japan,National Institutes of Natural Sciences (NINS)
Tamura, Motohide (author)
University of Tokyo, Japan,National Astronomical Observatory of Japan,National Institutes of Natural Sciences (NINS)
Sato, Bun’ei (author)
Tokyo Institute of Technology
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 (creator_code:org_t)
2023-02-27
2023
English.
In: Astronomical Journal. - : American Astronomical Society. - 1538-3881 .- 0004-6256. ; 165:3
Related links:
https://research.cha... (primary) (free)
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https://research.cha...
https://doi.org/10.3...
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • We report on the discovery of an Earth-sized transiting planet (R p = 1.015 ± 0.051 R ⊕) in a P = 4.02 day orbit around K2-415 (EPIC 211414619), an M5V star at 22 pc. The planet candidate was first identified by analyzing the light-curve data obtained by the K2 mission, and it is here shown to exist in the most recent data from TESS. Combining the light curves with the data secured by our follow-up observations, including high-resolution imaging and near-infrared spectroscopy with IRD, we rule out false-positive scenarios, finding a low false-positive probability of 2 × 10−4. Based on IRD’s radial velocities of K2-415, which were sparsely taken over three years, we obtain a planet mass of 3.0 ± 2.7 M ⊕ (M p < 7.5 M ⊕ at 95% confidence) for K2-415b. Being one of the lowest-mass stars (≈0.16 M ⊙) known to host an Earth-sized transiting planet, K2-415 will be an interesting target for further follow-up observations, including additional radial velocity monitoring and transit spectroscopy.

Subject headings

NATURVETENSKAP  -- Fysik -- Subatomär fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Subatomic Physics (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)

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