J/ApJ/789/L38ivo://CDS.VizieR/J/ApJ/789/L38doi:10.26093/cds/vizier.17899038CDSBalog Z.Muzerolle J.Flaherty K.Detre O.H.Bouwmann J.Furlan E.,Gutermuth R.Juhasz A.Bally J.Nielbock M.Klaas U.Krause O.,Henning T.Marton G.2017-07-05T06:59:22Z2017-03-13T13:04:15ZCDS support team

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

cds-question@unistra.frinfrared-photometryprotostarsWe report Herschel/Photodetector Array Camera and Spectrometer (PACS) photometric observations at 70 {mu}m and 160 {mu}m of LRLL54361, a suspected binary protostar that exhibits periodic (P = 25.34 days) flux variations at shorter wavelengths (3.6 {mu}m and 4.5 {mu}m) thought to be due to pulsed accretion caused by binary motion. The PACS observations show unprecedented flux variation at these far-infrared wavelengths that are well correlated with the variations at shorter wavelengths. At 70 {mu}m the object increases its flux by a factor of six while at 160 {mu}m the change is about a factor of two, consistent with the wavelength dependence seen in the far-infrared spectra. The source is marginally resolved at 70 {mu}m with varying FWHM. Deconvolved images of the sources show elongations exactly matching the outflow cavities traced by the scattered light observations. The spatial variations are anti-correlated with the flux variation, indicating that a light echo is responsible for the changes in FWHM. The observed far-infrared flux variability indicates that the disk and envelope of this source is periodically heated by the accretion pulses of the central source, and suggests that such long wavelength variability in general may provide a reasonable proxy for accretion variations in protostars.2014ApJ...789L..38Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/789/L38CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/419/999 : Infrared knots along protostellar jets (Giannini+, 2004)J/AJ/144/31 : Spitzer+2MASS photometry of protostar candidatesJ/AJ/145/94 : Luminosities of protostars from two Spitzer surveysJ/AJ/151/75 : Herschel-PACS and -SPIRE spectroscopy of 70 objectsJ/ApJS/224/5 : The Herschel Orion Protostar Survey (HOPS): SEDs (Furlan+, 2016https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/789/L38https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/789/L38http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/789/L38https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/789/L38https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/789/L38http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/789/L38GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tap9.699422546568423e-22 3.243176138527326e-21InfrareddefaultJ/ApJ/789/L38/table1Observing log of the observations and measured fluxesObsYear of the observationtime.epochJDJulian Date of the observationdtime.epochdoublePhasePhase (2)time.phasefloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCycle? Cycle number (1)meta.id;meta.mainintnullableF70? Herschel/PACS 70 micron band flux densityJyphot.flux.density;em.IR.30-60umfloatnullablee_F70? Error in F70Jystat.errorfloatnullableF100? Herschel/PACS 100 micron band flux densityJyphot.flux.density;em.IR.60-100umfloatnullablee_F100? Error in F100Jystat.errorfloatnullableF160? Herschel/PACS 160 micron band flux densityJyphot.flux.density;em.mm.1500-3000GHzfloatnullablee_F160? Error in F160Jystat.errorfloatnullable