J/A+A/651/A93ivo://CDS.VizieR/J/A+A/651/A93doi:10.26093/cds/vizier.36510093CDSMaldonado J.Petralia A.Damasso M.Pinamonti M.Scandariato G.,Gonzalez-Alvarez E.Affer L.Micela G.Lanza A.F.Leto G.Poretti E.,Sozzetti A.Perger M.Giacobbe P.Zanmar Sanchez R.Maggio A.,Gonzalez Hernandez J.I.Rebolo R.Ribas I.Suarez-Mascareno A.,Toledo-Padron B.Bignamini A.Molinari E.Covino E.Claudi R.,Desidera S.Herrero E.Morales J.C.Pagano I.Piotto G.2022-07-07T13:06:44Z2021-07-22T09:02:56ZCDS support team

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

cds-question@unistra.frmultiple-starslate-type-starsspectroscopyexoplanetsIt is now well-established that small, rocky planets are common around low-mass stars. However, the detection of such planets is challenged by the short-term activity of the host stars. The HArps-N red Dwarf Exoplanet Survey (HADES) program is a long-term project at the Telescopio Nazionale Galileo aimed at the monitoring of nearby, early-type, M dwarfs, using the HARPS-N spectrograph to search for small, rocky planets. A total of 174 HARPS-N spectroscopic observations of the M0.5V-type star GJ 9689 taken over the past seven years have been analysed. We combined these data with photometric measurements to disentangle signals related to the stellar activity of the star from possible Keplerian signals in the radial velocity data. We run an MCMC analysis, applying Gaussian Process regression techniques to model the signals present in the data. We identify two periodic signals in the radial velocity time series, with periods of 18.27d, and 39.31d. The analysis of the activity indexes, photometric data, and wavelength dependency of the signals reveals that the 39.31d signal corresponds to the stellar rotation period. On the other hand, the 18.27d signal shows no relation to any activity proxy or the first harmonic of the rotation period. We, therefore, identify it as a genuine Keplerian signal. The best-fit model describing the newly found planet, GJ 9689 b, corresponds to an orbital period P_b_=18.27+/-0.01d, and a minimum mass M_P_sini=9.65+/-1.41M_{sun}_.2021A&A...651A..93Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/651/A93CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/593/A117 : GJ 3998 RVs, S and Halpha indexes (Affer+, 2016)J/A+A/598/A26 : HADES RV Programme with HARPS-N at TNG. II. (Perger+, 2017)J/A+A/605/A92 : GJ 625 HARPS-N data (Suarez Mascareno+, 2017)J/A+A/608/A63 : HADES VI. GJ 3942b activity with HARPS-N (Perger+, 2017)J/A+A/622/A193 : Gl686 RV curves and BVR photometry (Affer+, 2019)J/A+A/644/A68 : Abundance signature of M dwarf stars (Maldonado+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/651/A93https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/651/A93http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/651/A93https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/651/A93https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/651/A93http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/651/A93GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/651/A93/tablea1Observational data for GJ 9689recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDObservation date (BJD-2400000)dtime.epochdoubleRV? Radial Velocitym/sphys.veloc;pos.heliocentricfloatnullablee_RV? Uncertainty on radial velocitym/sstat.errorfloatnullableS-indexActivity S-indexspect.indexfloate_S-indexUncertainty on S-indexstat.errorfloatHalphaActivity Halpha indexspect.indexfloate_HalphaUncertainty on Halpha indexstat.error;spect.linefloatNaIActivity NaI indexmeta.code;spect.indexfloate_NaIUncertainty on NaI indexstat.errorfloat