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dc.contributor.author
Bonfils, X.
dc.contributor.author
Astudillo Defru, Nicola
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Diaz, Rodrigo Fernando
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Almenara, J.-M.
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Forveille, T.
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Bouchy, F.
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Delfosse, X.
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Lovis, C.
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Mayor, M.
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Murgas, F.
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Pepe, F.
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Santos, N.C.
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Ségransan, D.
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Udry, S.
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Wünsche, A.
dc.date.available
2023-08-25T12:51:44Z
dc.date.issued
2018-05
dc.identifier.citation
Bonfils, X.; Astudillo Defru, Nicola; Diaz, Rodrigo Fernando; Almenara, J.-M.; Forveille, T.; et al.; A temperate exo-Earth around a quiet M dwarf at 3.4 parsec; EDP Sciences; Astronomy and Astrophysics; 613; A25; 5-2018; 1-9
dc.identifier.issn
0004-6361
dc.identifier.uri
http://hdl.handle.net/11336/209352
dc.description.abstract
The combination of high-contrast imaging and high-dispersion spectroscopy, which has successfully been use to detect the atmosphere of a giant planet, is one of the most promising potential probes of the atmosphere of Earth-size worlds. The forthcoming generation of extremely large telescopes (ELTs) may obtain sufficient contrast with this technique to detect O2 in the atmosphere of those worlds that orbit low-mass M dwarfs. This is strong motivation to carry out a census of planets around cool stars for which habitable zones can be resolved by ELTs, i.e. for M dwarfs within ~5 parsec. Our HARPS survey has been a major contributor to that sample of nearby planets. Here we report on our radial velocity observations of Ross 128 (Proxima Virginis, GJ447, HIP 57548), an M4 dwarf just 3.4 parsec away from our Sun. This source hosts an exo-Earth with a projected mass m sini = 1.35 M and an orbital period of 9.9 days. Ross 128 b receives less than 1.5 times as much flux as Earth from the Sun and its equilibrium ranges in temperature between 269 K for an Earth-like albedo and 213 K for a Venus-like albedo. Recent studies place it close to the inner edge of the conventional habitable zone. An 80-day long light curve from K2 campaign C01 demonstrates that Ross 128 b does not transit. Together with the All Sky Automated Survey (ASAS) photometry and spectroscopic activity indices, the K2 photometry shows that Ross 128 rotates slowly and has weak magnetic activity. In a habitability context, this makes survival of its atmosphere against erosion more likely. Ross 128 b is the second closest known exo-Earth, after Proxima Centauri b (1.3 parsec), and the closest temperate planet known around a quiet star. The 15 mas planet-star angular separation at maximum elongation will be resolved by ELTs (>3λD) in the optical bands of O2.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
EDP Sciences
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
PLANETARY SYSTEMS
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STARS: LATE-TYPE
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TECHNIQUES: RADIAL VELOCITIES
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Astronomía
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Ciencias Físicas
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CIENCIAS NATURALES Y EXACTAS
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dc.title
A temperate exo-Earth around a quiet M dwarf at 3.4 parsec
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2019-12-18T13:52:58Z
dc.journal.volume
613
dc.journal.number
A25
dc.journal.pagination
1-9
dc.journal.pais
Francia
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París
dc.description.fil
Fil: Bonfils, X.. Universite Grenoble Alpes; Francia
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Fil: Astudillo Defru, Nicola. Universidad de Ginebra; Suiza
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Fil: Diaz, Rodrigo Fernando. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina. Universidad de Buenos Aires; Argentina
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Fil: Almenara, J.-M.. Universidad de Ginebra; Suiza
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Fil: Forveille, T.. Universite Grenoble Alpes; Francia
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Fil: Bouchy, F.. Universidad de Ginebra; Suiza
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Fil: Delfosse, X.. Universite Grenoble Alpes; Francia
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Fil: Lovis, C.. Universidad de Ginebra; Suiza
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Fil: Mayor, M.. Universidad de Ginebra; Suiza
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Fil: Murgas, F.. Instituto Astrofisico de Canarias; España. Universidad de La Laguna; España
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Fil: Pepe, F.. Universidad de Ginebra; Suiza
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Fil: Santos, N.C.. Universidad de Porto; Portugal
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Fil: Ségransan, D.. Universidad de Ginebra; Suiza
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Fil: Udry, S.. Universidad de Ginebra; Suiza
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Fil: Wünsche, A.. Universite Grenoble Alpes; Francia
dc.journal.title
Astronomy and Astrophysics
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1051/0004-6361/201731973
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/full_html/2018/05/aa31973-17/aa31973-17.html
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