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Article: Three planets around HD 27894: A close-in pair with a 2:1 period ratio and an eccentric Jovian planet at 5.4 AU

TitleThree planets around HD 27894: A close-in pair with a 2:1 period ratio and an eccentric Jovian planet at 5.4 AU
Authors
KeywordsTechniques: radial velocities
Planetary systems
Planets and satellites: dynamical evolution and stability
Issue Date2017
PublisherEDP Sciences. The Journal's web site is located at http://www.aanda.org
Citation
Astronomy & Astrophysics, 2017, v. 602, article no. L8, p. 1-5 How to Cite?
AbstractAims. Our new program with HARPS aims to detect mean motion resonant planetary systems around stars which were previously reported to have a single bona fide planet, often based only on sparse radial velocity data. Methods. Archival and new HARPS radial velocities for the K2V star HD 27894 were combined and fitted with a three-planet self-consistent dynamical model. The best-fit orbit was tested for long-term stability. Results. We find clear evidence that HD 27894 is hosting at least three massive planets. In addition to the already known Jovian planet with a period Pb≈ 18 days we discover a Saturn-mass planet with Pc≈ 36 days, likely in a 2:1 mean motion resonance with the first planet, and a cold massive planet (≈5.3 MJup) with a period Pd ≈ 5170 days on a moderately eccentric orbit (ed = 0.39). Conclusions. HD 27894 is hosting a massive, eccentric giant planet orbiting around a tightly packed inner pair of massive planets likely involved in an asymmetric 2:1 mean motion resonance. HD 27894 may be an important milestone for probing planetary formation and evolution scenarios.
Persistent Identifierhttp://hdl.handle.net/10722/244949
ISSN
2023 Impact Factor: 5.4
2023 SCImago Journal Rankings: 1.896
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorTrifonov, T-
dc.contributor.authorKürster, M-
dc.contributor.authorZechmeister, M-
dc.contributor.authorZakhozhay, OV-
dc.contributor.authorReffert, S-
dc.contributor.authorLee, MH-
dc.contributor.authorRodler, F-
dc.contributor.authorVogt, SS-
dc.contributor.authorBrems, SS-
dc.date.accessioned2017-09-18T02:01:57Z-
dc.date.available2017-09-18T02:01:57Z-
dc.date.issued2017-
dc.identifier.citationAstronomy & Astrophysics, 2017, v. 602, article no. L8, p. 1-5-
dc.identifier.issn0004-6361-
dc.identifier.urihttp://hdl.handle.net/10722/244949-
dc.description.abstractAims. Our new program with HARPS aims to detect mean motion resonant planetary systems around stars which were previously reported to have a single bona fide planet, often based only on sparse radial velocity data. Methods. Archival and new HARPS radial velocities for the K2V star HD 27894 were combined and fitted with a three-planet self-consistent dynamical model. The best-fit orbit was tested for long-term stability. Results. We find clear evidence that HD 27894 is hosting at least three massive planets. In addition to the already known Jovian planet with a period Pb≈ 18 days we discover a Saturn-mass planet with Pc≈ 36 days, likely in a 2:1 mean motion resonance with the first planet, and a cold massive planet (≈5.3 MJup) with a period Pd ≈ 5170 days on a moderately eccentric orbit (ed = 0.39). Conclusions. HD 27894 is hosting a massive, eccentric giant planet orbiting around a tightly packed inner pair of massive planets likely involved in an asymmetric 2:1 mean motion resonance. HD 27894 may be an important milestone for probing planetary formation and evolution scenarios.-
dc.languageeng-
dc.publisherEDP Sciences. The Journal's web site is located at http://www.aanda.org-
dc.relation.ispartofAstronomy & Astrophysics-
dc.rightsReproduced with permission from Astronomy & Astrophysics, © ESO 2017. The original publication is available at https://doi.org/10.1051/0004-6361/201731044-
dc.subjectTechniques: radial velocities-
dc.subjectPlanetary systems-
dc.subjectPlanets and satellites: dynamical evolution and stability-
dc.titleThree planets around HD 27894: A close-in pair with a 2:1 period ratio and an eccentric Jovian planet at 5.4 AU-
dc.typeArticle-
dc.identifier.emailLee, MH: mhlee@hku.hk-
dc.identifier.authorityLee, MH=rp00724-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1051/0004-6361/201731044-
dc.identifier.scopuseid_2-s2.0-85020855720-
dc.identifier.hkuros279246-
dc.identifier.volume602-
dc.identifier.spagearticle no. L8, p. 1-
dc.identifier.epagearticle no. L8, p. 5-
dc.identifier.isiWOS:000404648300136-
dc.publisher.placeFrance-
dc.identifier.issnl0004-6361-

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