J/A+A/650/A138ivo://CDS.VizieR/J/A+A/650/A138doi:10.26093/cds/vizier.36500138CDSSeli B.Vida K.Moor A.Pal A.Olah K.2023-05-05T11:18:19Z2021-06-22T06:05:53ZCDS support team

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

cds-question@unistra.frm-starsphotometryvisible-astronomystellar-agesAs more exoplanets are being discovered around ultracool dwarfs, understanding their magnetic activity - and the implications for habitability - is of prime importance. To find stellar flares and photometric signatures related to starspots, continuous monitoring is necessary, which can be achieved with spaceborn observatories like the Transiting Exoplanet Survey Satellite (TESS). We present an analysis of TRAPPIST-1 like ultracool dwarfs with TESS full- frame image photometry from the first two years of the primary mission. A volume-limited sample up to 50pc is constructed consisting of 339 stars closer than 0.5mag to TRAPPIST-1 on the Gaia colour-magnitude diagram. The 30-min cadence TESS light curves of 248 stars were analysed, searching for flares and rotational modulation caused by starspots. The composite flare frequency distribution of the 94 identified flares shows a power law index similar to TRAPPIST-1, and contains flares up to E_TESS_=3*10^33^erg. Rotational periods shorter than 5 days were determined for 42 stars, sampling the regime of fast rotators. The ages of 88 stars from the sample were estimated using kinematic information. A weak correlation between rotational period and age is observed, which is consistent with magnetic braking.2021A&A...650A.138Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/650/A138CatalogResearchIsServedByTAP VizieR generic servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/650/A138https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/650/A138http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/650/A138https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/650/A138https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/650/A138http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/650/A138GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tap1.9867573869263685e-19 3.916500758235022e-19OpticaldefaultJ/A+A/650/A138/tableb1Flare parametersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGaiaDR2Gaia DR2 source_idmeta.id;meta.mainTpeak? Fitted Julian time of the flare peakdtime.epoch;stat.maxdoublenullablee_Tpeak? Uncertainty of the fitted time of the flare peakdstat.errorfloatnullablet12? Fitted half-time of the flaremintime.epochfloatnullablee_t12? Uncertainty of the fitted half-time of the flareminstat.errorfloatnullableAmpl? Fitted amplitude of the flaretime.expofloatnullablee_Ampl? Uncertainty of the fitted amplitude of the flarestat.errorfloatnullableEDfit? Equivalent duration from fitted parametersmintime.durationfloatnullablee_EDfit? Uncertainty of the equivalent duration from fitted parametersminstat.errorfloatnullableEDsum? Equivalent duration from integrated fluxmintime.durationfloatnullablee_EDsum? Uncertainty of the equivalent duration from integrated fluxminstat.errorfloatnullableEsum? Flare energy in 10^31^erg from EDsum1e+34Wphys.energyfloatnullablee_Esum? Uncertainty of the flare energy in 10^31^erg from EDsum1e+34Wstat.errorfloatnullableJ/A+A/650/A138/tablec1Comoving pair candidates from Gaia DR2recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTargetGaia DR2 source_id of the targetmeta.id.part;meta.mainCompGaia DR2 source_id of the companionmeta.id.part;meta.mainSep[60/9970]? SeparationAUpos.angDistanceintnullableAge? Kinematic ageGyrtime.agefloatnullablee_Age? Kinematic age uncertaintyGyrstat.error;time.agefloatnullableCommComment on the companionmeta.notecharJ/A+A/650/A138/photList of light curve files for 240 Gaia DR2 sources of table2recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGaiaDR2Gaia DR2 source_idmeta.id;meta.mainTESS-Sector[1/26] TESS sectormeta.id;obsintLCShow the light curvemeta.ref.urlcharFileNameFilename, in subdirectory lcmeta.id;meta.filecharJ/A+A/650/A138/table2The TRAPPIST-1 analogue samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSimbadSimbad column added by the CDSmeta.ref.urlcharLCindicates light curvemeta.ref.urlcharGaiaDR2Gaia DR2 source_idmeta.id;meta.mainprimaryTIC? TESS Input Catalog IDmeta.idnullableBPmag? Gaia BP magnitudemagphot.mag;em.opt.BfloatnullableRPmag? Gaia RP magnitudemagphot.mag;em.opt.RfloatnullableDist? Distancepcpos.distancefloatnullablee_Dist? Uncertainty of distancepcstat.errorfloatnullableTESS-SectorsComma separated TESS sectors where the target was observedmeta.id;obscharEWHa? H{alpha} equivalent width0.1nmspect.line.eqWidthfloatnullablee_EWHa? Uncertainty of H{alpha} equivalent width0.1nmstat.errorfloatnullableAge? AgeGyrtime.agefloatnullablee_Age? Uncertainty of AgeGyrstat.error;time.agefloatnullableCommComment on agemeta.note;time.agecharJ/A+A/650/A138/tablea1Rotational periods from the Lomb-Scargle analysisrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGaiaDR2Gaia DR2 source_idmeta.id;meta.mainPer[0.1/4.92] rotational perioddtime.perioddoublee_PerUncertainty of the rotational perioddstat.errordoubleFAPFalse alarm probabilitystat.fit.goodnesscharAmpl[0.9/34.8] amplitudemmagsrc.var.amplitudefloatScatter[2.8/54.1] scattermmagstat.error;src.var.amplitudefloatNflares[0/10] number of flaresmeta.numberint