J/AJ/170/125ivo://CDS.VizieR/J/AJ/170/125CDSChen Z.Johnstone D.Contreras Pena C.Lee J.-E.Liu S.-Y.,Herczeg G.Mairs S.Park G.Kim K.-T.Kim M.-R.Qiu K.Wang Y.-T.,Zhang XuReiter M.The JCMT Transient Team2026-06-17T12:33:02Z2026-06-17T13:16:48ZCDS support team

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

cds-question@unistra.fryoung-stellar-objectsmillimeter-astronomyphotometrysubmillimeter-astronomyh-ii-regionsvariable-starsinfrared-astronomyWe conducted a comprehensive analysis of young stellar object (YSO) variability at submillimeter and mid-infrared (mid-IR) wavelengths for the M17 H_II_ region using 3.5yr monitoring data from the James Clerk Maxwell Telescope (JCMT) Transient Survey at 450 and 850um and 9yr mid-IR monitoring data from the NEOWISE mission. Our study encompasses observations of 198 and 164 bright submillimeter peaks identified within the deep JCMT coadded maps at 450 and 850um, and 66 YSOs seen by NEOWISE W2 that were previously identified in mid-IR observations. We find one robust linear submillimeter variable, an intermediate mass protostar, with a 4% peak flux change in 3.5yr of JCMT monitoring that sets a lower limit of 16% luminosity increase for the source. At mid-IR wavelengths, our analysis reveals secular and stochastic variability in 22 YSOs, with the highest fraction of secular variability occurring at the earliest evolutionary stage. This mid-IR fractional variability as a function of evolutionary stage result is similar to what has previously been found for YSO variability within the Gould Belt and the intermediate-mass star formation region M17 SWex, though overall less variability is detected in M17 in submillimeter and mid-IR. We suspect that this lower detection of YSO variability is due to both the greater distance to M17 and the strong feedback from the H ii region. Our findings showcase the utility of multiwavelength observations to better capture the complex variability phenomena inherent to star formation processes and demonstrate the importance of years-long monitoring of a diverse selection of star-forming environments.2025AJ....170..125Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/170/125CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/386 : VPHAS+ DR3 survey (Drew+, 2025)J/MNRAS/363/405 : SIMBA observations of cold cores (Hill+, 2005)J/ApJ/644/990 : Sub-mm clumps at 450 and 850{mu}m in M17 (Reid+, 2006)J/ApJS/175/277 : Submillimeter-Continuum SCUBA detections (Di Francesco+, 2008)J/A+A/481/345 : SED evolution in massive young stellar obj. (Molinari+, 2008)J/ApJ/696/1278 : The extended star-forming environment of M17 (Povich+, 2009)J/ApJ/714/L285 : YSO candidates in M17 SWex (Povich+, 2010)J/MNRAS/416/178 : 1.2-mm dust clumps with luminous water masers (Breen+, 2011)J/AJ/144/192 : Spitzer survey of Orion A and B. I. YSO catalog (Megeath+, 2012)J/ApJS/209/31 : The MYStIX IR-Excess Source catalog (MIRES) (Povich+, 2013)J/MNRAS/440/2036 : VPHAS+ survey synthetic colours (Drew+, 2014)J/ApJ/792/30 : NEOWISE magnitudes for near-Earth objects (Mainzer+, 2014)J/MNRAS/465/3011 : VVV high amplitude NIR var. stars (Contreras Pena+, 2017)J/A+A/599/A49 : Pre-main sequence stars evolutionary models (Kunitomo+, 2017)J/AJ/155/99 : IR variab. among YSOs the Serpens South cluster (Wolk+, 2018)J/ApJ/870/32 : Kinematics in young star clusters & associations (Kuhn+, 2019)J/MNRAS/495/3614 : IR and sub-mm variability in protostars (Contreras+, 2020)J/ApJS/254/33 : Gal. midplane Spitzer/IRAC candidate YSOs (SPICY) (Kuhn+, 2021)J/AJ/162/191 : 2011-2021 calibrator observations of SCUBA-2 (Mairs+, 2021)J/ApJ/920/132 : NEOWISE 6.5yr variability in YSOs (Park+, 2021)J/AJ/162/52 : Census of variable stars toward Serpens Main (Yin+, 2021)J/A+A/657/A131 : Ten new systems with O stars (Maiz Apellaniz+, 2022)J/MNRAS/510/3389 : High-mass star formation evolution. trends (Urquhart+, 2022)J/ApJ/930/114 : 44GHz VLA obs. of methanol masers in DR21(OH) (Wenner+, 2022)J/AJ/168/122 : 3.5yr monitoring of M17 SWex with JCMT & NEOWISE (Park+, 2024)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/170/125https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/170/125http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/170/125https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/170/125https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/170/125http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/170/125GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/170/125/table4 (JCMT transient statistics of bright sources (>0.65Jy/beam at 450um) in M17)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/170/125/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/170/125/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/170/125/table4?GETtext/xml+votable180.050000true275.0933333-16.19111110.005555555555555556Cone search capability for table J/AJ/170/125/table5 (JCMT transient statistics of bright sources (>0.14Jy/beam at 850um) in M17)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/170/125/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/170/125/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/170/125/table5?GETtext/xml+votable180.050000true275.0933333-16.19083330.0055555555555555566/29115-29116 29118https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/170/125?format=asciiInfraredMillimeterdefaultJ/AJ/170/125/table4JCMT transient statistics of bright sources (>0.65Jy/beam at 450um) in M17_DEPositions derived from JCMTPP identifiers (declination part)degpos.eq.dec;meta.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/198] Index number (Index)meta.idintIDSource identifiermeta.id;meta.maincharFlux[660/73765] Mean peak flux at 450ummJy/beamphot.flux.density;em.mm.400-750GHz;stat.meanintStd[85/2184] Standard deviation of peak flux (SD)mJy/beamstat.stdev;phot.flux.density;em.mm.400-750GHzintNStd[0.5/1.7] Normalized standard deviation of peak flux (SD/SDfid) (G1)stat.stdev;phot.flux.density;em.mm.400-750GHzfloat_RAPositions derived from JCMTPP identifiers (right ascension part)degpos.eq.ra;meta.mainJ/AJ/170/125/table5JCMT transient statistics of bright sources (>0.14Jy/beam at 850um) in M17recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/164] Index number (Index)meta.idintIDSource identifiermeta.id;meta.maincharFlux[140/17954] Mean peak flux at 850ummJy/beamphot.flux.density;em.mm.200-400GHz;stat.maxintStd[10/233] Standard deviation of peak flux (SD)mJy/beamstat.stdev;phot.flux.density;em.mm.200-400GHzintNStd[0.5/1.8] Normalized standard deviation of peak flux (SD/SDfid) (G1)stat.stdev;phot.flux.density;em.mm.200-400GHzfloat_RAPositions derived from JCMTPP identifiers (right ascension part)degpos.eq.ra;meta.main_DEPositions derived from JCMTPP identifiers (declination part)degpos.eq.dec;meta.main