J/A+A/667/A63ivo://CDS.VizieR/J/A+A/667/A63doi:10.26093/cds/vizier.36670063CDSZakhozhay O.V.Launhardt R.Mueller A.Brems S.Eigenthaler P.,Gennaro M.Hempel A.Hempel M.Henning T.Kennedy G.Kim S.,Kuerster M.Lachaume R.Manerikar Y.Patel J.Pavlov A.Reffert S.,Trifonov T.2022-11-28T12:07:21Z2022-11-08T15:35:28ZCDS support team

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

cds-question@unistra.frsurveysradial-velocityexoplanetsThe occurrence rate and period distribution of (giant) planets around young stars is still not as well constrained as for older main-sequence stars. This is mostly due to the intrinsic activity-related complications and the avoidance of young stars in many large planet search programmes. Yet, dynamical restructuring processes in planetary systems may last significantly longer than the actual planet formation phase and may well extend long into the debris disc phase, such that the planet populations around young stars may differ from those observed around main-sequence stars. We introduce our Radial Velocity Survey for Planets around Young stars (RVSPY), which is closely related to the NaCo-ISPY direct imaging survey, characterise our target stars, and search for substellar companions at orbital separations smaller than a few au from the host star. We used the FEROS spectrograph, mounted to the MPG/ESO 2.2m telescope in Chile, to obtain high signal-to-noise spectra and time series of precise radial velocities (RVs) of 111 stars, most of which are surrounded by debris discs. Our target stars have spectral types between early F and late K, a median age of 400Myr, and a median distance of 45pc. During the initial reconnaissance phase of our survey, we determined stellar parameters and used high-cadence observations to characterise the intrinsic stellar activity, searched for hot companions with orbital periods of up to 10 days, and derived the detection thresholds for longer-period companions. In our analysis we, have included archival spectroscopic data, spectral energy distribution, and data for photometric time series from the TESS mission. For all target stars we determined their basic stellar parameters and present the results of the high-cadence RV survey and activity characterisation. We have achieved a median single-measurement RV precision of 6m/s and derived the short-term intrinsic RV scatter of our targets (median 23m/s), which is mostly caused by stellar activity and decays with an age from >100m/s at <20Myr to <20m/s at >500Myr. We analysed time series periodograms of the high-cadence RV data and the shape of the individual cross-correlation functions. We discovered six previously unknown close companions with orbital periods between 10 and 100 days, three of which are low-mass stars, and three are in the brown dwarf mass regime. We detected no hot companion with an orbital period <10 days down to a median mass limit of ~1M_{Jup}_ for stars younger than 50Myr, which is still compatible with the established occurrence rate of such companions around main-sequence stars. We found significant RV periodicities between 1.3 and 4.5 days for 14 stars, which are, however, all caused by rotational modulation due to starspots. We also analysed the data for TESS photometric time series and found significant periodicities for most of the stars. For 11 stars, the photometric periods are also clearly detected in the RV data. We also derived stellar rotation periods ranging from 1 to 10 days for 91 stars, mostly from the TESS data. From the intrinsic activity-related short-term RV jitter, we derived the expected mass-detection thresholds for longer-period companions, and selected 84 targets for the longer-term RV monitoring.2022A&A...667A..63Zhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/667/A63CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/667/A63https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/667/A63http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/667/A63https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/667/A63https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/667/A63http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/667/A63GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/667/A63/tablea1 (Target list and basic stellar parameters of debris disc stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/667/A63/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/667/A63/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/667/A63/tablea1?GETtext/xml+votable180.050000true1.4689367-41.75306810.005555555555555556Cone search capability for table J/A+A/667/A63/tablea2 (Target list and basic stellar parameters of stars without disc excess)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/667/A63/tablea2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/667/A63/tablea2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/667/A63/tablea2?GETtext/xml+votable180.050000true5.7157853-12.20943610.0055555555555555566/461 765 1069 1084 8433 8717 8790 12341 12654 12676 13036 16543 16837 17219 17552 17607 17953 18680 19509 20166 20716 21082 21194 21285 22067 22146 23190 23335 23889 24634 24810 25279 25564 26086 26216 27395 28041 30540 31667 33500 33678 34164 34282 34409 34494 34508 34825 34947 34993 35064 35497 35753 36288 36664 36713 36762 36969 37641 37780 37838 38151 38765 38932 38937 39123 39693 40101 40932 41607 41710 41847 42174 42555 42559 42563 42600 42613 42669 42903 42917 43029 43055 43129 43168 43171 43197 43224 43287 43358 43433 43527 43804 43877 44052 45351 45412 45430 45927 46113 46234 46416 46987 47205 47212 47414 47758 47775 47935 48334 48627 486513.322582951404819e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/667/A63?format=asciidefaultJ/A+A/667/A63/tablea1Target list and basic stellar parameters of debris disc starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStellar IDmeta.id;meta.mainchardDistance, inferred from Gaia DR2 parallaxes with the method described in Bailer-Jones et al., 2018AJ....156...58B, Cat. I/347pcpos.distancefloatVmagVisual magnitude, taken from The Hipparcos, Tycho Catalogues and from SIMBADmagphot.mag;em.opt.VfloatSpTypeSpectral type from SIMBADsrc.spTypecharTeff-spStellar effective temperature (2)Kphys.temperature.effectiveintTeff-phStellar effective temperature (3)Kphys.temperature.effectiveint[Fe/H]Stellar metallicity (2)phys.abund.ZfloatloggStellar surface gravity (2)log(cm.s**-2)phys.gravityfloatMassStellar mass (4)solMassphys.massfloatSimbadSimbad column added by the CDSmeta.ref.urlcharLumPhotometric luminosity (3)solLumphys.luminosityfloatl_vsiniLimit flag in vsinimeta.code.error;phys.veloc.rotatcharvsiniRotational velocity (2)km/sphys.veloc.rotatfloatAssocAssociation membership with the probability of >80% according to BANYAN Sigma (5)meta.id.parentcharn_Assoc[*] Note on Assoc (1)meta.notecharlogAgeAge from the literaturelog(Myr)time.agefloate_logAgeAge uncertainty from the literaturelog(Myr)stat.error;time.agefloatNotesNotes to individual objectsmeta.notecharRefReferences for the ages (6)meta.refchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/A+A/667/A63/tablea2Target list and basic stellar parameters of stars without disc excessNameStellar IDmeta.id;meta.maincharTeff-spStellar effective temperature (2)Kphys.temperature.effectiveintTeff-phStellar effective temperature (3)Kphys.temperature.effectiveintl_vsiniLimit flag in vsinimeta.code.error;phys.veloc.rotatcharvsiniRotational velocity (2)km/sphys.veloc.rotatfloat[Fe/H]Stellar metallicity (2)phys.abund.ZfloatVmagVisual magnitude, taken from The Hipparcos, Tycho Catalogues and from SIMBADmagphot.mag;em.opt.VfloatSpTypeSpectral type from SIMBADsrc.spTypecharloggStellar surface gravity (2)log(cm.s**-2)phys.gravityfloatMassStellar mass (4)solMassphys.massfloatLumPhotometric luminosity (3)solLumphys.luminosityfloatAssocAssociation membership with the probability of >80% according to BANYAN Sigma (5)meta.id.parentcharn_Assoc[*] Note on Assoc (1)meta.notecharlogAgeAge from the literaturelog(Myr)time.agefloate_logAgeAge uncertainty from the literaturelog(Myr)stat.error;time.agefloatNotesNotes to individual objectsmeta.notecharRefReferences for the ages (6)meta.refcharSimbadSimbad column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintdDistance, inferred from Gaia DR2 parallaxes with the method described in Bailer-Jones et al., 2018AJ....156...58B, Cat. I/347pcpos.distancefloat