J/MNRAS/489/3492ivo://CDS.VizieR/J/MNRAS/489/3492doi:10.26093/cds/vizier.74893492CDSDharmawardena T.E.Kemper F.Wouterloot J.G.AScicluna P.Marshall J.P,Wallstrom S.H.J.2024-08-20T20:12:58Z2019-10-02T14:46:28ZCDS support team

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

cds-question@unistra.frvariable-starsmillimeter-astronomyphotometrysubmillimeter-astronomyWe present the sub-mm variability of two of the most well-studied AGB stars, IRC +10216 and omicron Ceti. The data are obtained at 450 and 850um as part of pointing calibration observations for the James Clerk Maxwell Telescope's SCUBA-2 instrument over a span of 7yr. The periods are derived using non-parametric methods, Gatspy Supersmoother and P4J, in order not to assume an underlying shape to the periodicity. These were compared to two Lomb-Scargle parametric methods. We find that for both sources and wavelengths the periods derived from all methods are consistent within {sigma}. The 850um phase folded light curves of IRC +10216 show a time lag of ~540d compared to its optical counterpart. We explore the origins of the sub-mm variability and the phase lag using radiative transfer models. Combining the modelling with findings in the literature, we find that the sub-mm emission and phase lag can be partially attributed to the dust formation or destruction cycle. A second, unknown mechanism must be invoked; we defer an investigation of the origin and nature of this mechanism to a future work.2019MNRAS.489.3492Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/489/3492CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/592/A42 : A study of dust nucleation in Mira. Part I. (Kaminski+, 2016)J/ApJS/177/275 : 1.3 and 2mm survey of IRC+10216 (He+, 2008)J/ApJS/190/348 : 1mm spectral survey of IRC+10216 + VY CMa (Tenenbaum+, 2010)J/A+A/574/A56 : IRC +10216 17.8GHz-26.3GHz spectrum (Gong+, 2015)J/A+A/606/A74 : IRC +10216 13.3GHz-18.5GHz spectrum (Zhang+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/489/3492https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/489/3492http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/489/3492https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/489/3492https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/489/3492http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/489/3492GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapMillimeterdefaultJ/MNRAS/489/3492/cwleo450450 micron photometry of IRC+10216 (CW Leo)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJDDate of Observationdtime.epochdoubleFluxObserved FluxmJyphot.flux.density;em.radiodoublee_FluxUncertainty on observed fluxmJystat.error;phot.fluxdoubleJ/MNRAS/489/3492/cwleo850850 micron photometry of IRC+10216 (CW Leo)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJDDate of Observationdtime.epochdoubleFluxObserved FluxmJyphot.flux.density;em.radiodoublee_FluxUncertainty on observed fluxmJystat.error;phot.fluxdoubleJ/MNRAS/489/3492/mira450450 micron photometry of omicron Ceti (Mira)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJDDate of Observationdtime.epochdoubleFluxObserved FluxmJyphot.flux.density;em.radiodoublee_FluxUncertainty on observed fluxmJystat.error;phot.fluxdoubleJ/MNRAS/489/3492/mira850850 micron photometry of omicron Ceti (Mira)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJDDate of Observationdtime.epochdoubleFluxObserved FluxmJyphot.flux.density;em.radiodoublee_FluxUncertainty on observed fluxmJystat.error;phot.fluxdouble