Planetary system around the nearby M dwarf GJ 357 including a transiting, hot, Earth-sized planet optimal for atmospheric characterization

We report the detection of a transiting Earth-size planet around GJ 357, a nearby M2.5 V star, using data from the Transiting Exoplanet Survey Satellite (TESS). GJ 357 b (TOI-562.01) is a transiting, hot, Earth-sized planet (T_(eq) = 525 ± 11 K) with a radius of R_(b) = 1.217 ± 0.084 Rꚛ and an orbit...

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Detalhes bibliográficos
Autores: Caballero, J. A., Cortés Contreras, Miriam, Montes Gutiérrez, David
Formato: artículo
Fecha de publicación:2019
País:España
Recursos:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/13693
Acesso em linha:https://hdl.handle.net/20.500.14352/13693
Access Level:acceso abierto
Palavra-chave:52
Echelle spectrometer
Bayesian_inference
Error-correction
Giant planets
Mass
Precision
Exoplanet
Sky
Search
Stars
Astrofísica
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oai_identifier_str oai:docta.ucm.es:20.500.14352/13693
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repository_id_str
spelling Planetary system around the nearby M dwarf GJ 357 including a transiting, hot, Earth-sized planet optimal for atmospheric characterizationCaballero, J. A.Cortés Contreras, MiriamMontes Gutiérrez, David52Echelle spectrometerBayesian_inferenceError-correctionGiant planetsMassPrecisionExoplanetSkySearchStarsAstrofísicaWe report the detection of a transiting Earth-size planet around GJ 357, a nearby M2.5 V star, using data from the Transiting Exoplanet Survey Satellite (TESS). GJ 357 b (TOI-562.01) is a transiting, hot, Earth-sized planet (T_(eq) = 525 ± 11 K) with a radius of R_(b) = 1.217 ± 0.084 Rꚛ and an orbital period of P_(b) = 3.93 d. Precise stellar radial velocities from CARMENES and PFS, as well as archival data from HIRES, UVES, and HARPS also display a 3.93-day periodicity, confirming the planetary nature and leading to a planetary mass of M_(b) = 1.84 ± 0.31 Mꚛ. In addition to the radial velocity signal for GJ 357 b, more periodicities are present in the data indicating the presence of two further planets in the system: GJ 357 c, with a minimum mass of M_(c) = 3.40 ± 0.46 Mꚛ in a 9.12 d orbit, and GJ 357 d, with a minimum mass of M_(d) = 6.1 ± 1.0 Mꚛ in a 55.7 d orbit inside the habitable zone. The host is relatively inactive and exhibits a photometric rotation period of P_(rot) = 78 ± 2 d. GJ 357 b is to date the second closest transiting planet to the Sun, making it a prime target for further investigations such as transmission spectroscopy. Therefore, GJ 357 b represents one of the best terrestrial planets suitable for atmospheric characterization with the upcoming JWST and ground-based ELTs.EDP Sciences S AUniversidad Complutense de Madrid20192019-08-0620192019-08-06journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/13693reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/136932026-06-02T12:44:21Z
dc.title.none.fl_str_mv Planetary system around the nearby M dwarf GJ 357 including a transiting, hot, Earth-sized planet optimal for atmospheric characterization
title Planetary system around the nearby M dwarf GJ 357 including a transiting, hot, Earth-sized planet optimal for atmospheric characterization
spellingShingle Planetary system around the nearby M dwarf GJ 357 including a transiting, hot, Earth-sized planet optimal for atmospheric characterization
Caballero, J. A.
52
Echelle spectrometer
Bayesian_inference
Error-correction
Giant planets
Mass
Precision
Exoplanet
Sky
Search
Stars
Astrofísica
title_short Planetary system around the nearby M dwarf GJ 357 including a transiting, hot, Earth-sized planet optimal for atmospheric characterization
title_full Planetary system around the nearby M dwarf GJ 357 including a transiting, hot, Earth-sized planet optimal for atmospheric characterization
title_fullStr Planetary system around the nearby M dwarf GJ 357 including a transiting, hot, Earth-sized planet optimal for atmospheric characterization
title_full_unstemmed Planetary system around the nearby M dwarf GJ 357 including a transiting, hot, Earth-sized planet optimal for atmospheric characterization
title_sort Planetary system around the nearby M dwarf GJ 357 including a transiting, hot, Earth-sized planet optimal for atmospheric characterization
dc.creator.none.fl_str_mv Caballero, J. A.
Cortés Contreras, Miriam
Montes Gutiérrez, David
author Caballero, J. A.
author_facet Caballero, J. A.
Cortés Contreras, Miriam
Montes Gutiérrez, David
author_role author
author2 Cortés Contreras, Miriam
Montes Gutiérrez, David
author2_role author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 52
Echelle spectrometer
Bayesian_inference
Error-correction
Giant planets
Mass
Precision
Exoplanet
Sky
Search
Stars
Astrofísica
topic 52
Echelle spectrometer
Bayesian_inference
Error-correction
Giant planets
Mass
Precision
Exoplanet
Sky
Search
Stars
Astrofísica
description We report the detection of a transiting Earth-size planet around GJ 357, a nearby M2.5 V star, using data from the Transiting Exoplanet Survey Satellite (TESS). GJ 357 b (TOI-562.01) is a transiting, hot, Earth-sized planet (T_(eq) = 525 ± 11 K) with a radius of R_(b) = 1.217 ± 0.084 Rꚛ and an orbital period of P_(b) = 3.93 d. Precise stellar radial velocities from CARMENES and PFS, as well as archival data from HIRES, UVES, and HARPS also display a 3.93-day periodicity, confirming the planetary nature and leading to a planetary mass of M_(b) = 1.84 ± 0.31 Mꚛ. In addition to the radial velocity signal for GJ 357 b, more periodicities are present in the data indicating the presence of two further planets in the system: GJ 357 c, with a minimum mass of M_(c) = 3.40 ± 0.46 Mꚛ in a 9.12 d orbit, and GJ 357 d, with a minimum mass of M_(d) = 6.1 ± 1.0 Mꚛ in a 55.7 d orbit inside the habitable zone. The host is relatively inactive and exhibits a photometric rotation period of P_(rot) = 78 ± 2 d. GJ 357 b is to date the second closest transiting planet to the Sun, making it a prime target for further investigations such as transmission spectroscopy. Therefore, GJ 357 b represents one of the best terrestrial planets suitable for atmospheric characterization with the upcoming JWST and ground-based ELTs.
publishDate 2019
dc.date.none.fl_str_mv 2019
2019-08-06
2019
2019-08-06
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/13693
url https://hdl.handle.net/20.500.14352/13693
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv EDP Sciences S A
publisher.none.fl_str_mv EDP Sciences S A
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,301629

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