J/A+A/599/A90ivo://CDS.VizieR/J/A+A/599/A90doi:10.26093/cds/vizier.35990090CDSBenatti S.Desidera S.Damasso M.Malavolta L.Lanza A.F.Biazzo K.,Bonomo A.S.Claudi R.U.Marzari F.Poretti E.Gratton R.Micela G.,Pagano I.Piotto G.Sozzetti A.Boccato C.Cosentino R.Covino E.,Maggio A.Molinari E.Smareglia R.Affer L.Andreuzzi G.Bignamini A.,Borsa F.di Fabrizio L.Esposito M.Martinez Fiorenzano A.Messina S.,Giacobbe P.Harutyunyan A.Knapic C.Maldonado J.Masiero S.,Nascimbeni V.Pedani M.Rainer M.Scandariato G.Silvotti R.2017-06-27T06:37:57Z2017-03-06T07:30:49ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frmultiple-starssolar-system-planetsradial-velocityIn order to understand the observed physical and orbital diversity of extrasolar planetary systems, a full investigation of these objects and of their host stars is necessary. Within this field, one of the main purposes of the GAPS observing project with HARPS-N@TNG is to provide a more detailed characterisation of already known systems. In this framework we monitored the star, hosting two giant planets, HD108874, with HARPS-N for three years in order to refine the orbits, to improve the dynamical study and to search for additional low-mass planets in close orbits. We subtracted the radial velocity (RV) signal due to the known outer planets, finding a clear modulation of 40.2d period. We analysed the correlation between RV residuals and the activity indicators and modelled the magnetic activity with a dedicated code. Our analysis suggests that the 40.2d periodicity is a signature of the rotation period of the star. A refined orbital solution is provided, revealing that the system is close to a mean motion resonance of about 9:2, in a stable configuration over 1Gyr. Stable orbits for low-mass planets are limited to regions very close to the star or far from it. Our data exclude super-Earths with Msini>~5M_{earth}_ within 0.4AU and objects with Msini>~2M_{earth}_ with orbital periods of a few days. Finally we put constraints on the habitable zone of the system, assuming the presence of an exomoon orbiting the inner giant planet.2017A&A...599A..90Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/599/A90CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/554/A28 : Qatar-1 differential light curve (Covino+, 2013)J/A+A/575/A111 : GAPS V: Global analysis of the XO-2 system (Damasso+, 2015)J/A+A/575/L15 : TrES-4b RV and Ic curves (Sozzetti+, 2015)J/A+A/578/A64 : Velocity curve of {tau} Boo A (Borsa+, 2015)J/A+A/579/A136 : HAT-P-36 and WASP-11/HAT-P-10 light curves (Mancini+, 2015)J/A+A/583/A135 : XO-2N and XO-2S spectra (Biazzo+, 2015)J/A+A/588/A118 : Pr0211 RVs, photometry and activity indexes (Malavolta+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/599/A90https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/599/A90http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/599/A90https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/599/A90https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/599/A90http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/599/A90GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/599/A90/tablea1Time series of the HARPS-N spectra for HD 108874recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian Date (UTC) (BJD-2450000)dtime.epochdoubleRVRadial Velocitykm/sphys.veloc;pos.heliocentricdoublee_RVError on the Radial Velocitykm/sstat.errorfloatBVSBisector Velocity Spankm/sphys.velocfloate_BVSError on the Bisector Velocity Spankm/sstat.errorfloatlogR'HKActivity index of the H&K lines of the CaIIphot.flux;arith.ratiofloate_logR'HKError on the logR'_HK_stat.errorfloatHalphaActivity index of the Halpha linespect.index;em.line.Halpha;spect.linefloate_HalphaError on the Halphastat.errorfloat