J/ApJ/929/60ivo://CDS.VizieR/J/ApJ/929/60doi:10.26093/cds/vizier.19290060CDSYoon S.-Y.Herczeg G.J.Lee J.-E.Lee H.-G.Johnstone D.Varricatt W.,Tobin J.J.Contreras Pena C.Mairs S.Hodapp K.Manoj P.Osorio M.,Megeath S.T.the JCMT Transient Team2024-11-06T20:25:01Z2024-04-09T08:13:42ZCDS support team

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

cds-question@unistra.frinfrared-photometrymillimeter-astronomyphotometrysubmillimeter-astronomyyoung-stellar-objectsObserved changes in protostellar brightness can be complicated to interpret. In our James Clerk Maxwell Telescope (JCMT) Transient Monitoring Survey, we discovered that a young binary protostar, HOPS373, is undergoing a modest 30% brightness increase at 850um, caused by a factor of 1.8-3.3 enhancement in the accretion rate. The initial burst occurred over a few months, with a sharp rise and then a shallower decay. A second rise occurred soon after the decay, and the source is still bright one year later. The mid-IR emission, the small-scale CO outflow mapped with ALMA, and the location of variable maser emission indicate that the variability is associated with the SW component. The near-IR and NEOWISE W1 and W2 emission is located along the blueshifted CO outflow, spatially offset by ~3 to 4" from the SW component. The K-band emission imaged by UKIRT shows a compact H_2_ emission source at the edge of the outflow, with a tail tracing the outflow back to the source. The W1 emission, likely dominated by scattered light, brightens by 0.7mag, consistent with expectations based on the submillimeter light curve. The signal of continuum variability in K band and W2 is masked by stable H_2_ emission, as seen in our Gemini/GNIRS spectrum, and perhaps by CO emission. These differences in emission sources complicate IR searches for variability of the youngest protostars.2022ApJ...929...60Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/929/60CatalogResearchIsServedByTAP VizieR generic servicerelated-toII/359 : The VISTA Hemisphere Survey (VHS) catalog DR4.1 (McMahon+, 2013)I/345 : Gaia DR2 (Gaia Collaboration, 2018)II/367 : The VISTA Hemisphere Survey (VHS) catalog DR5 (McMahon+, 2020)I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)J/A+A/372/L41 : NGC 2068/2071 protoclusters (Motte+, 2001)J/ApJ/559/307 : Sub-mm mapping in Orion B molecular cloud (Johnstone+, 2001)J/AJ/136/2391 : GLIMPSE Extended Green Objects catalog (Cyganowski+, 2008)J/ApJS/184/18 : Spitzer survey of young stellar clusters (Gutermuth+, 2009)J/MNRAS/404/661 : Young stellar outflows near-IR imaging (Varricatt+ 2010)J/AJ/144/192 : Spitzer survey of Orion A & B. I. YSO catalog (Megeath+, 2012)J/other/Nat/493.378 : LRL 54361 Spitzer light curves (Muzerolle+, 2013)J/other/Nat/493.378 : LRL 54361 Spitzer light curves (Muzerolle+, 2013)J/AJ/145/59 : Optical and mid-IR photometry of PTF 10nvg (Hillenbrand+, 2013)J/ApJ/767/36 : APEX observations of HOPS protostars (Stutz+, 2013)J/ApJ/789/L38 : LRLL54361 protostar Herschel/PACS fluxes (Balog+, 2014)J/ApJ/792/30 : NEOWISE magnitudes for near-Earth objects (Mainzer+, 2014)J/A+A/581/A140 : VISTA Orion mini-survey (Spezzi+, 2015)J/ApJS/220/11 : SEDs of Spitzer YSOs in the Gould Belt (Dunham+, 2015)J/ApJ/817/167 : JCMT Gould Belt Survey: dense cores in Orion B (Kirk+, 2016)J/ApJS/224/5 : Herschel Orion Protostar Survey (HOPS): SEDs (Furlan+, 2016)J/MNRAS/465/3039 : Eruptive variable protostars from VVV EW (Contreras+, 2017)J/ApJS/229/28 : SFiNCs: X-ray, IR and membership catalogs (Getman+, 2017)J/MNRAS/472/2990 : Catalogue of eruptive YSOs and unusual stars (Lucas+, 2017)J/ApJS/235/30 : Herschel-PACS legacy of low-mass protostars (Karska+, 2018)J/AJ/156/84 : APOGEE-2 survey of Orion Complex. II. (Kounkel+, 2018)J/A+A/632/A101 : Extremely high-velocity jets in Serpens (Tychoniec+, 2019)J/ApJ/889/148 : V346 Nor IJHKs photometry & IR spectra (Kospal+, 2020)J/ApJ/890/130 : VANDAM survey of Orion protostars. II. (Tobin+, 2020)J/MNRAS/495/3614 : IR and sub-mm variability in protostars (Contreras+, 2020)J/ApJ/905/119 : HOPS: Herschel/PACS 70 and 160um obs. (Fischer+, 2020)J/ApJ/920/132 : NEOWISE 6.5yr variability in YSOs (Park+, 2021)J/AJ/162/191 : 2011-2021 calibrator observations of SCUBA-2 (Mairs+, 2021)J/ApJ/921/110 : NIR sp. of Class 0 protostars in Perseus & Orion (Laos+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/929/60https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/929/60http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/929/60https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/929/60https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/929/60http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/929/60GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapInfraredMillimeterdefaultJ/ApJ/929/60/table1*Selected UKIRT K-band photometryTexp[3/72] Exposure timestime.duration;obs.exposureintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJD[55984.3/59477.6] Modified Julian Datedtime.epochdoubleBrt[15.46/15.74] Apparent K band magnitude of bright compact objectmagphot.mag;em.IR.Kfloate_Brt[0.01/0.03] Uncertainty in Brtmagstat.errorfloatTail[15.8/16.4] Apparent K band magnitude of tailmagphot.mag;em.IR.Kfloate_Tail[0.01/0.05] Uncertainty in Tailmagstat.errorfloatJ/ApJ/929/60/table2Selected SCUBA-2 sub-mm peak brightnessrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJD[57382.49/59541.4] Modified Julian Datedtime.epochdoubleFlux850[1.17/1.6] SCUBA flux density at 850 microns (1)Jy/beamphot.flux.density;em.mm.200-400GHzfloatFlux450[4.2/6.7]? SCUBA flux density at 450 microns (1)Jy/beamphot.flux.density;em.mm.400-750GHzfloatnullable