Four Jovian planets around low-luminosity giant stars observed by the EXPRESS and PPPS

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dc.contributor.authorJones, M. I.
dc.contributor.authorWittenmyer, R.
dc.contributor.authorAguilera-Gomez, C.
dc.contributor.authorSoto, M. G.
dc.contributor.authorTorres, P.
dc.contributor.authorTrifonov, T.
dc.contributor.authorJenkins, J. S.
dc.contributor.authorZapata, A.
dc.contributor.authorSarkis, P.
dc.contributor.authorZakhozhay, O.
dc.contributor.authorBrahm, R.
dc.contributor.authorRamirez, R.
dc.contributor.authorSantana, F.
dc.contributor.authorVines, J. I.
dc.contributor.authorDiaz, M. R.
dc.contributor.authorVuckovic, M.
dc.contributor.authorPantoja, B.
dc.date.accessioned2025-01-20T23:53:04Z
dc.date.available2025-01-20T23:53:04Z
dc.date.issued2021
dc.description.abstractWe report the discovery of planetary companions orbiting four low-luminosity giant stars with M-star between 1.04 and 1.39 M-circle dot. All four host stars have been independently observed by the EXoPlanets aRound Evolved StarS (EXPRESS) program and the Pan-Pacific Planet Search (PPPS). The companion signals were revealed by multi-epoch precision radial velocities obtained in nearly a decade. The planetary companions exhibit orbital periods between similar to 1.2 and 7.1 yr, minimum masses of m(p)sin i similar to 1.8-3.7 M-J, and eccentricities between 0.08 and 0.42. With these four new systems, we have detected planetary companions to 11 out of the 37 giant stars that are common targets in the EXPRESS and PPPS. After excluding four compact binaries from the common sample, we obtained a fraction of giant planets (m(p) greater than or similar to 1- 2 M-J) orbiting within 5 AU from their parent star of f = 33.3(-7.1)(+9.0)%. This fraction is slightly higher than but consistent at the 1 sigma level with previous results obtained by different radial velocity surveys. Finally, this value is substantially higher than the fraction predicted by planet formation models of gas giants around stars more massive than the Sun.
dc.fuente.origenWOS
dc.identifier.doi10.1051/0004-6361/202038555
dc.identifier.eissn1432-0746
dc.identifier.issn0004-6361
dc.identifier.urihttps://doi.org/10.1051/0004-6361/202038555
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/94940
dc.identifier.wosidWOS:000621398400001
dc.language.isoen
dc.revistaAstronomy & astrophysics
dc.rightsacceso restringido
dc.subjectasteroseismology
dc.subjecttechniques: radial velocities
dc.subjectplanets and satellites: detection
dc.subjectplanets and satellites: formation
dc.subject.ods13 Climate Action
dc.subject.odspa13 Acción por el clima
dc.titleFour Jovian planets around low-luminosity giant stars observed by the EXPRESS and PPPS
dc.typeartículo
dc.volumen646
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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