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dc.contributor.authorAnglada-Escude, Guillem
dc.contributor.authorTuomi, Mikko
dc.contributor.authorGerlach, Enrico
dc.contributor.authorBarnes, Rory
dc.contributor.authorHeller, Rene
dc.contributor.authorJenkins, James S.
dc.contributor.authorWende, Sebastian
dc.contributor.authorVogt, Steven S.
dc.contributor.authorButler, R. Paul
dc.contributor.authorReiners, Ansgar
dc.contributor.authorJones, H.R.A.
dc.date.accessioned2018-01-30T21:12:33Z
dc.date.available2018-01-30T21:12:33Z
dc.date.issued2013-08-07
dc.identifier.citationAnglada-Escude , G , Tuomi , M , Gerlach , E , Barnes , R , Heller , R , Jenkins , J S , Wende , S , Vogt , S S , Butler , R P , Reiners , A & Jones , H R A 2013 , ' A dynamically-packed planetary system around GJ 667C with three super-Earths in its habitable zone ' , Astronomy & Astrophysics , vol. 556 , A126 . https://doi.org/10.1051/0004-6361/201321331
dc.identifier.issn0004-6361
dc.identifier.otherPURE: 7180961
dc.identifier.otherPURE UUID: 329b6bf0-37b4-4cdb-b02d-741cb450d6c9
dc.identifier.otherWOS: 000323893500126
dc.identifier.otherScopus: 84881427917
dc.identifier.urihttp://hdl.handle.net/2299/19627
dc.descriptionGuillen Anglada-Escude, et al, 'A dynamically-packed planetary system around GJ 667J with three super-Earths in its habitable zone', A&A, Vol. 556, A126, first published online 7 August 2013. The version of record is available at doi: http://doi.org/10.1051/0004-6361/201321331. © ESO 2013. Reproduced with permission from Astronomy & Astrophysics. Published by EDP Sciences
dc.description.abstractContext. Since low-mass stars have low luminosities, orbits at which liquid water can exist on Earth-sized planets are relatively close-in, which produces Doppler signals that are detectable using state-of-the-art Doppler spectroscopy. Aims. GJ 667C is already known to be orbited by two super-Earth candidates. We have recently applied developed data analysis methods to investigate whether the data supports the presence of additional companions. Methods. We obtain new Doppler measurements from HARPS extracted spectra and combined them with those obtained from the PFS and HIRES spectrographs. We used Bayesian and periodogram-based methods to re-assess the number of candidates and evaluated the confidence of each detection. Among other tests, we validated the planet candidates by analyzing correlations of each Doppler signal with measurements of several activity indices and investigated the possible quasi-periodic nature of signals. Results. Doppler measurements of GJ 667C are described better by six (even seven) Keplerian-like signals: the two known candidates (b and c); three additional few-Earth mass candidates with periods of 92, 62, and 39 days (d, e and f); a cold super-Earth in a 260-day orbit (g) and tantalizing evidence of a similar to 1 M-circle plus object in a close-in orbit of 17 days (h). We explore whether long-term stable orbits are compatible with the data by integrating 8 x 10(4) solutions derived from the Bayesian samplings. We assess their stability using secular frequency analysis. Conclusions. The system consisting of six planets is compatible with dynamically stable configurations. As for the solar system, the most stable solutions do not contain mean-motion resonances and are described well by analytic Laplace-Lagrange solutions. Preliminary analysis also indicates that masses of the planets cannot be higher than twice the minimum masses obtained from Doppler measurements. The presence of a seventh planet (h) is supported by the fact that it appears squarely centered on the only island of stability left in the six-planet solution. Habitability assessments accounting for the stellar flux, as well as tidal dissipation effects, indicate that three (maybe four) planets are potentially habitable. Doppler and space-based transit surveys indicate that 1) dynamically packed systems of super-Earths are relatively abundant and 2) M-dwarfs have more small planets than earlier-type stars. These two trends together suggest that GJ 667C is one of the first members of an emerging population of M-stars with multiple low-mass planets in their habitable zones.en
dc.format.extent24
dc.language.isoeng
dc.relation.ispartofAstronomy & Astrophysics
dc.rights/dk/atira/pure/core/openaccesspermission/open
dc.subjecttechniques: radial velocities
dc.subjectmethods: data analysis
dc.subjectplanets and satellites: dynamical evolution and stability
dc.subjectastrobiology
dc.subjectstars: individual: GJ 667C
dc.subjectEXTRA-SOLAR PLANETS
dc.subjectMAIN-SEQUENCE STARS
dc.subjectLOW-MASS STARS
dc.subjectM-CIRCLE-PLUS
dc.subjectM-DWARF
dc.subjectTERRESTRIAL PLANETS
dc.subjectHARPS SEARCH
dc.subjectCOMPOSITIONAL DIVERSITY
dc.subjectI. DESCRIPTION
dc.subjectGIANT PLANETS
dc.titleA dynamically-packed planetary system around GJ 667C with three super-Earths in its habitable zoneen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionScience & Technology Research Institute
dc.contributor.institutionCentre for Astrophysics Research
dc.description.statusPeer reviewed
dc.relation.schoolSchool of Physics, Astronomy and Mathematics
dc.description.versiontypeFinal Published version
dcterms.dateAccepted2013-06-04
rioxxterms.versionSMUR
rioxxterms.versionVoR
rioxxterms.versionofrecordhttps://doi.org/10.1051/0004-6361/201321331
rioxxterms.licenseref.urihttp://creativecommons.org/licenses/by-nc/4.0/
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.rights.accesstypeopenAccess


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