J/AJ/163/80ivo://CDS.VizieR/J/AJ/163/80doi:10.26093/cds/vizier.51630080CDSWagner K.Apai D.Kasper M.McClure M.Robberto M.2023-12-20T08:26:14Z2022-05-20T06:54:05ZCDS support team

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

cds-question@unistra.fra-starsexoplanetsinfrared-astronomyspectroscopystellar-spectral-typesThe first directly imaged exoplanets indicated that wide-orbit giant planets could be more common around A-type stars. However, the relatively small number of nearby A-stars has limited the precision of exoplanet demographics studies to >~10%. We aim to constrain the frequency of wide-orbit giant planets around A-stars using the VLT/SPHERE extreme adaptive optics system, which enables targeting <~100 A-stars between 100 and 200pc. We present the results of a survey of 84 A-stars within the nearby ~5-17Myr old ScoOB2 association. The survey detected three companions-one of which is a new discovery (HIP75056Ab), whereas the other two (HD95086b and HIP65426b) are now-known planets that were included without a priori knowledge of their existence. We assessed the image sensitivity and observational biases with injection and recovery tests combined with Monte Carlo simulations to place constraints on the underlying demographics. We measure a decreasing frequency of giant planets with increasing separation, with measured values falling between 10% and 2% for separations of 30-100au, and 95% confidence-level upper limits of <~45%-8% for planets on 30-100au orbits, and <~5% between 200 and 500au. These values are in excellent agreement with recent surveys of A-stars in the solar neighborhood-supporting findings that giant planets out to separations of <~100 au are more frequent around A-stars than around solar-type hosts. Finally, the relatively low occurrence rate of super-Jupiters on wide orbits, the positive correlation with stellar mass, and the inverse correlation with orbital separation are consistent with core accretion being their dominant formation mechanism.2022AJ....163...80Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/163/80CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration, 2018)J/A+A/337/403 : Low-mass stars evolutionary models (Baraffe+ 1998)J/AJ/117/354 : OB associations from Hipparcos (de Zeeuw+, 1999)J/A+A/430/137 : Close visual companions in Scorpius OB2 (Kouwenhoven+, 2005)J/ApJ/794/159 : Statistical analysis of exoplanet surveys (Brandt+, 2014)J/other/Sci/350.64 : 51 Eri b near-infrared spectrum (Macintosh+, 2015)J/ApJ/831/125 : ALMA 887{mu}m obs. ChaI star-forming region (Pascucci+, 2016)J/MNRAS/461/794 : Scorpius-Centaurus K-Type Stars (Pecaut+, 2016)J/A+A/605/L9 : NIR spectrum of exoplanet HIP 65426b (Chauvin+, 2017)J/ApJ/860/109 : Keck HIRES obs. 245 subgiants (Ghezzi+, 2018)J/AJ/156/286 : The LEECH exoplanet imaging survey (Stone+, 2018)J/AJ/158/13 : The first 300 stars observed by the GPIES (Nielsen+, 2019)J/AJ/159/63 : AO obs. exoplanets & brown dwarf companions (Bowler+, 2020)J/A+A/648/A73 : Discovery of the directly imaged planet YSES 2b (Bohn+, 2021)J/A+A/646/A164 : BEAST sample properties (Janson+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/163/80https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/163/80http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/163/80https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/163/80https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/163/80http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/163/80GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/163/80/tablea1 (Targets Sco-Cen A-type Stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/163/80/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/163/80/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/163/80/tablea1?GETtext/xml+votable180.050000true154.77125-64.6763890.0055555555555555566/37175 37237 37314 37968 37977-37978 38215 38255 38272 41513 41618 41643 41652 41869 41971 42382 42399-42400 42412 42465 42610 42617 42619 42628 42684 42701 42708 42730 42754 42758 42808 42896 42911 42913 42923 42959 42994 43012 43017 43093 43111 43127 43130 43139 43147 43154 43160 43201 43205 43224 43228 43255-43256 43276 43285 43292-43293 43301 43323 43331-43333 43339 43345 43364 43402-43403 43423 43523 43540 44055 44068-44069 44073 44088 44096 44098 44136 44146 44308 44319 44352 44356 44361 44368 443717.952274030004205e-20 1.0188844282367877e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/163/80?format=asciiInfrareddefaultJ/AJ/163/80/tablea1Targets Sco-Cen A-type StarsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTarget[1/88] Target identification numbermeta.id;meta.numberintRAJ2000[10/17] Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000[20/72]? Degree of declination (J2000)pos.eq.dec;meta.mainnullableHIPHIP numbermeta.id;meta.mainintKsmag[5.21/8.29] Ks-band magnitudemagphot.mag;em.IR.KfloatSpTSpectral typesrc.spTypeGroupSubgroup (1)meta.notecharObs[2015/2019] Year of observationtime.epochTexp[16.4/101] Exposure timemintime.duration;obs.exposurefloatField[0.25/355] Rotation fielddegpos.posAng;obs.fieldfloatFiltFilter used; J, H, K and Yinstr.setupcharDIT[4/96] Detector Integration Timestime.epochfloatSurveySurvey identifier (2)meta.idcharSimbadSimbad column added by the CDSmeta.ref.urlchar