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dc.contributor.authorUdry, S.
dc.contributor.authorDumusque, X.
dc.contributor.authorLovis, C.
dc.contributor.authorSégransan, D.
dc.contributor.authorDiaz, R. F.
dc.contributor.authorBenz, W.
dc.contributor.authorBouchy, F.
dc.contributor.authorCoffinet, A.
dc.contributor.authorLo Curto, G.
dc.contributor.authorMayor, M.
dc.contributor.authorMordasini, C.
dc.contributor.authorMotalebi, F.
dc.contributor.authorPepe, F.
dc.contributor.authorQueloz, D.
dc.contributor.authorSantos, N. C.
dc.contributor.authorWyttenbach, A.
dc.contributor.authorAlonso, R.
dc.contributor.authorCollier Cameron, A.
dc.contributor.authorDeleuil, M.
dc.contributor.authorFigueira, P.
dc.contributor.authorGillon, M.
dc.contributor.authorMoutou, C.
dc.contributor.authorPollacco, D.
dc.contributor.authorPompei, E.
dc.identifier.citationUdry , S , Dumusque , X , Lovis , C , Ségransan , D , Diaz , R F , Benz , W , Bouchy , F , Coffinet , A , Lo Curto , G , Mayor , M , Mordasini , C , Motalebi , F , Pepe , F , Queloz , D , Santos , N C , Wyttenbach , A , Alonso , R , Collier Cameron , A , Deleuil , M , Figueira , P , Gillon , M , Moutou , C , Pollacco , D & Pompei , E 2019 , ' The HARPS search for southern extra-solar planets : XLIV. Eight HARPS multi-planet systems hosting 20 super-Earth and Neptune-mass companions ' , Astronomy & Astrophysics , vol. 622 , A37 , pp. 1-29 .
dc.identifier.otherBibCode: 2017arXiv170505153U
dc.identifier.otherRIS: urn:72E8A8376C56CB9879CB41E133FC419C
dc.identifier.otherRIS: 10.105100046361201731173
dc.identifier.otherORCID: /0000-0002-8863-7828/work/62668324
dc.descriptionWe thank the Swiss National Science Foundation (SNSF) and the Geneva University for their continuous support to our planet search programs. This work has been in particular carried out in the frame of the National Centre for Competence in Research “PlanetS” supported by SNSF. X.D. is grateful to the Society in Science–The Branco Weiss Fellowship for its financial support. N.C.S. was supported by Fundação para a Ciência e a Tecnologia (FCT, Portugal) through the research grant through national funds and by FEDER through COMPETE2020 by grants UID/FIS/04434/2013 & POCI-01-0145-FEDER-007672 and PTDC/FIS-AST/1526/2014 & POCI-01-0145-FEDER-016886, as well as through Investigador FCT contract nr. IF/00169/2012/CP0150/CT0002 funded by FCT and POPH/FSE (EC). P.F. acknowledges support by Fundação para a Ciência e a Tecnologia (FCT) through InvestigadorFCT contracts of reference IF/00169/2012/CP0150/CT0002, respectively, and POPH/FSE (EC) by FEDER funding through the program “Programa Operacional de Factores de Competitividade - COMPETE”. P.F. further acknowledges support from Fundação para a Ciência e a Tecnologia (FCT) in the form of an exploratory project of reference IF/01037/2013/CP1191/CT0001. A.C.C. acknowledges support from STFC consolidated grant ST/M001296/1.en
dc.description.abstractContext. We present radial-velocity measurements of eight stars observed with the HARPS Echelle spectrograph mounted on the 3.6-m telescope in La Silla (ESO, Chile). Data span more than ten years and highlight the long-term stability of the instrument. Aims. We search for potential planets orbiting HD 20003, HD 20781, HD 21693, HD 31527, HD 45184, HD 51608, HD 134060 and HD 136352 to increase the number of known planetary systems and thus better constrain exoplanet statistics. Methods. After a preliminary phase looking for signals using generalized Lomb-Scargle periodograms, we perform a careful analysis of all signals to separate bona-fide planets from signals induced by stellar activity and instrumental systematics. We finally secure the detection of all planets using the efficient MCMC available on the Data and Analysis Center for Exoplanets (DACE web-platform), using model comparison whenever necessary. Results. In total, we report the detection of twenty new super-Earth to Neptune-mass planets, with minimum masses ranging from 2 to 30 MEarth and periods ranging from 3 to 1300 days, in multiple systems with two to four planets. Adding CORALIE and HARPS measurements of HD20782 to the already published data, we also improve the characterization of the extremely eccentric Jupiter orbiting this visual companion of HD 20781.
dc.relation.ispartofAstronomy & Astrophysicsen
dc.subjectPlanetary systemsen
dc.subjectTechniques: radial velocitiesen
dc.subjectTechniques: spectroscopicen
dc.subjectMethods: data analysisen
dc.subjectStars: generalen
dc.subjectQB Astronomyen
dc.subjectQC Physicsen
dc.titleThe HARPS search for southern extra-solar planets : XLIV. Eight HARPS multi-planet systems hosting 20 super-Earth and Neptune-mass companionsen
dc.typeJournal articleen
dc.contributor.sponsorScience & Technology Facilities Councilen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews. St Andrews Centre for Exoplanet Scienceen
dc.description.statusPeer revieweden

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