Young stars variability with Gaia DR3 light curves J/A+A/705/A172 ivo://CDS.VizieR/J/A+A/705/A172 doi:10.26093/cds/vizier/bc-p1/lbhc CDS Mas C. Roquette J. Audard M. Madarasz M. Marton G. Hernandez D.,Gezer I. Dionatos O. 2026-03-02T20:01:04Z 2026-01-19T18:49:47Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr variable-stars photometry visible-astronomy infrared-astronomy Photometric variability is a defining characteristic of young stellar objects (YSOs) that can be traced back to a range of physical processes that occur at different stages in the formation and early evolution of young stars. The Gaia third Data Release (GDR3) has provided an unprecedented dataset of photometric time series, including 79375 light curves for sources classified as YSO candidates. Through its all-sky coverage, Gaia provides a unique opportunity for large-scale studies of YSO variability. Our goal was to characterise the GDR3 sample of YSO variables to better identify the recurrence of YSO variability modes (caused by accretion, extinction, rotation modulation, etc.). We made a pilot study of the applicability of the asymmetry (M) and periodicity (Q) variability metrics to characterise YSO variability with Gaia light curves. By adapting the Q-M metrics for sparse and long-term light curves, we sought to bridge the gap between low- and high-cadence survey insights on YSO variability. We adapted the Q-M method for Gaia. Through a refined sample selection, we identified sources with an appropriate sampling for the Q-M method. We used the generalised Lomb Scargle periodogram and structure functions to derive characteristic variability timescales. We successfully derived Q-M indices for 23000 sources in the GDR3 YSO sample. These variables were then classified into eight variability morphological classes. We linked the morphological classes with physical mechanisms using H{alpha} as a proxy of accretion and {alpha}IR indices to gauge whether circumstellar material was present. We demonstrate that the Q-M metrics can be successfully applied to study the sparse time series of Gaia. We applied it successfully to distinguish between the various variability modes of YSOs. While our results are generally consistent with previous high-cadence short-term studies, the long GDR3 time span yields a larger variety of variability mechanisms. 2026A&A...705A.172M https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/705/A172 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to J/AJ/147/82 : Monitoring of disk-bearing stars in NGC 2264 (Cody+, 2014) J/ApJS/208/9 : Intrinsic colors and temperatures of PMS stars (Pecaut+, 2013) J/A+A/674/A21 : KYSO - The Konkoly Optical YSO catalogue (Marton+, 2023) J/A+A/702/A63 : NEMESIS catalogue of YSOs in Orion (Roquette+, 2025) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/705/A172 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/705/A172 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/705/A172 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/705/A172 https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/705/A172 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/705/A172 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/A+A/705/A172/tabled1 (Catalog) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/705/A172/tabled1? https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/705/A172/tabled1? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/705/A172/tabled1? 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44356-44357 44366-44367 44392-44393 44400 44402-44403 44408-44409 44511 44529 44536-44537 44881 45116 45178 45189 45204 45208 45220 45224 45238 45405 45570 45607 45622 45731 45799 46031 46055 46092 46303 46632 46637 46986 47122 47137 47147 47161 47182 47213 47244 47250 47266 47268 47272 47274 47296 47782 47802 48272 48386 48401 48512 48563 48619 48886 48890 48915 48918 48937-48938 48970 49010 49049 1.9867573869263685e-19 3.916500758235022e-19 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/705/A172?format=ascii Optical Infrared default J/A+A/705/A172/tabled1 Catalog recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int GaiaDR3 Gaia DR3 source identifier meta.id;meta.main RAJ2000 Right Ascension (J2000) deg pos.eq.ra;meta.main indexed DEJ2000 Declination (J2000) deg pos.eq.dec;meta.main indexed plx Gaia DR3 parallax mas pos.parallax.trig double Gmag Gaia DR3 mean G magnitude mag phot.mag;em.opt double o_Gmag Number of epochs for G magnitude meta.number float CTTS ? Classical T Tauri star flag (1) meta.code int nullable longTimeScale ? Long timescale time.scale double nullable f_longTimeScale [FGLS ] Timescale derivation method for long timescale (2) meta.code char f_TimeScale [FGLS ] Timescale derivation method (2) meta.code char TimeScale ? Variability timescale d time.scale double nullable indexed Primary [true/false ] Primary sample flag meta.code char Mindex M-index from Cody et al. (2014AJ....147...82C, Cat. J/AJ/147/82) src.var.index double Qindex ? Q-index from Cody et al. (2014AJ....147...82C, Cat. J/AJ/147/82) src.var.index double nullable Disc IR Disc Class (4) meta.code.class char Amp G band Variability amplitude mag src.var.amplitude double MClass Variability morphological class inferred from Q-M indices (3) src.morph.type char alpha-ir ? alpha IR index for 2-24um spect.index double nullable NSED ? Number of SED points used for alpha_ir_ calculation meta.number float nullable lambdamin ? Maximum wavelength available for alpha_ir_ calculation um em.wl;stat.max double nullable lambdamax ? Maximum wavelength available for alpha_ir_ calculation um em.wl;stat.max double nullable SpType Spectral Type src.spType char f_SpType Method for Spectral type estimation (5) meta.code char