J/A+A/709/A123ivo://CDS.VizieR/J/A+A/709/A123CDSNari N.Suarez Mascareno A.Gonzalez Hernandez J.I.Stefanov A.K.,Rebolo R.Mestre J.M.Dumusque X.Cretignier M.Passegger V.M.,Mignon L.Manni F.De Amorim R.G.S.B.2026-05-19T14:14:26Z2026-05-12T17:02:25ZCDS support team

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

cds-question@unistra.frmultiple-starsexoplanetsradial-velocityvisible-astronomyThe development of refined instruments and techniques for a detailed analysis of the radial velocities (RVs) of stars other than the Sun allows the presence of planetary signals of amplitude below 1m/s to be investigated. Long-term RV surveys allow the detection of Earth-like and super-Earth-like planets in the habitable zones of Sun-like stars, prime targets for future missions for the atmospheric characterization of exoplanets. We present the analysis of the nearby G8 V-type star HD 161098 (V=7.68mag, d=29.75pc). We searched for terrestrial planets in the habitable zone. We combined historical datasets with new data collected in an ongoing blind search program with HARPS, HARPS-N, and ESPRESSO. We utilized recently developed tools to extract RVs and to deal with the analysis of stellar activity. We performed a joint analysis of RVs and activity indicators to separate the planetary signals from those related to activity. We detected two sub-m/s1 signals that we claim as candidate planets. We are not able to confirm their nature with certainty. Candidate HD 161098 b has an orbital period of 72.578_-0.060_^+0.059^d and a minimum mass of 3.63+/-0.59M_{Earth}_. HD 161098 c has an orbital period of 682.5_-9.9_^+9.5^d and a minimum mass of 7.8_-1.4_^+1.5^M_{Earth}_. If confirmed, candidate HD 161098 c would reside in the optimistic habitable zone of the star. We find a magnetic cycle of 4090_-130_^+140^d period and a rotation period of 28.22_-0.35_^+0.30^d. Our analysis sets the stage for future observing campaigns of the star, finalized for the confirmation of our results. We are entering the sub-m/s era at long orbital periods with a combination of stellar activity treatment and long-term campaigns.2026A&A...709A.123Nhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/709/A123CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/709/A123https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/709/A123http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/709/A123https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/709/A123https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/709/A123http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/709/A123GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/709/A123/tablee1ESPRESSO time series of RV and activity indicatorsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJDReduced Julian date (JD-240000)dtime.epochdoubleRVRadial velocitym/sphys.veloc;pos.heliocentricdoublee_RVRadial velocity errorm/sstat.errordoubleFWHMFull width at half maximumm/sspect.line.widthdoublee_FWHMFull width at half maximumm/sstat.error;phys.angSizedoubleBisSpanBisector spankm/sphys.velocdoublee_BisSpanBisector span errorkm/sstat.errordoubleContrastContrast%phot.flux;arith.ratiodoublee_ContrastContrast error%stat.errordoubleSMWMt. Wilson chromospheric activity index indexphot.flux;arith.ratiodoublee_SMWMt. Wilson chromospheric activity index index errorstat.errordoubleHalphaH-alpha indicatorspect.index;em.line.Halphadoublee_HalphaH-alpha indicator errorstat.error;spect.linedoubleNaNa indicatorspect.indexdoublee_NaNa indicator errorstat.errordoubleCaCa indicatorspect.indexdoublee_CaCa indicator errorstat.errordoubleRHKRHK activity indicatorphot.flux;arith.ratiodoublee_RHKRHK activity indicator errorstat.errordoubleBERVBarycentric Earth Radial Velocitykm/sspect.dopplerVeloc;pos.earth;pos.eopdoubleWeightWeightstat.weight;phys.atmol.weightintJ/A+A/709/A123/tablee2HARS-N, HARPS-03 and HARPS-15 time series of RV and activity indicatorsmodelModelstat.fit.paramdoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJDReduced Julian rdate (JD-240000)dtime.epochdoubleRVRadial velocitykm/sphys.veloc;pos.heliocentricdoublee_RVRadial velocity errorkm/sstat.errordoubleFWHMFull width at half maximumkm/sspect.line.widthdoublee_FWHMFull width at half maximumkm/sstat.error;phys.angSizedoubleBisSpanBisector spankm/sphys.velocdoublee_BisSpanBisector span errorkm/sstat.errordoubleContrastContrast%phot.flux;arith.ratiodoublee_ContrastContrast error%stat.errordoubleSMWMt. Wilson chromospheric activity index indexphot.flux;arith.ratiodoublee_SMWMt. Wilson chromospheric activity index index errorstat.errordoubleHalphaH-alpha indicatorspect.index;em.line.Halphadoublee_HalphaH-alpha indicator errorstat.error;spect.linedoubleNaNa indicatorspect.indexdoublee_NaNa indicator errorstat.errordoubleCaCa indicatorspect.indexdoublee_CaCa indicator errorstat.errordoubleRHKRHK activity indicatorphot.flux;arith.ratiodoublee_RHKRHK activity indicator errorstat.errordoubleBERVBarycentric Earth Radial Velocitykm/sspect.dopplerVeloc;pos.earth;pos.eopdoublesnCaIICaII S/Nstat.snrdoubleInstInstrument namemeta.id;instrcharVerins_drs_versionmeta.softwarechar