J/A+A/631/A64ivo://CDS.VizieR/J/A+A/631/A64doi:10.26093/cds/vizier.36310064CDSBjerkeli P.Ramsey J.P.Harsono D.Calcutt H.Kristensen L.E.,van der Wiel M.H.D.Jorgensen J.K.Muller S.Persson M.V.2019-10-22T07:56:11Z2019-10-22T08:55:36ZCDS support team

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

cds-question@unistra.fryoung-stellar-objectsinterstellar-mediumThe relationship between outflow launching and the formation of accretion disks around young stellar objects is still not entirely understood, which is why spectrally and spatially resolved observations are needed. Recently, the Atacama Large Millimetre/ sub-millimetre Array (ALMA) carried out long-baseline observations towards a handful of young sources, revealing connections between outflows and the inner regions of disks. Here we aim to determine the small-scale kinematical and morphological properties of the outflow from the isolated protostar B335 for which no Keplerian disk has, so far, been observed on scales down to 10au. We used ALMA in its longest-baseline configuration to observe emission from CO isotopologues, SiO, SO_2_, and CH_3_OH. The proximity of B335 provides a resolution of ~3au (0.03"). We also combined our long-baseline data with archival observations to produce a high-fidelity image covering scales up to 700 au (7"). ^12^CO has an X-shaped morphology with arms ~50au in width that we associate with the walls of an outflow cavity, similar to what is observed on larger scales. Long-baseline continuum emission is confined to <7au from the protostar, while short- baseline continuum emission follows the ^12^CO outflow and cavity walls. Methanol is detected within ~30au of the protostar. SiO is also detected in the vicinity of the protostar, but extended along the outflow. The ^12^CO outflow does not show any clear signs of rotation at distances >=30au from the protostar. SiO traces the protostellar jet on small scales, but without obvious rotation. CH_3_OH and SO_2_ trace a region <16au in diameter, centred on the continuum peak, which is clearly rotating. Using episodic, high-velocity, ^12^CO features, we estimate the launching radius of the outflow to be<0.1au and dynamical timescales of the order of a few years.2019A&A...631A..64Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/631/A64CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/475/281 : Herbig-Haro flows in B335 (Galfalk+, 2007)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/631/A64https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/631/A64http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/631/A64https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/631/A64https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/631/A64http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/631/A64GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/631/A64/list (List of fits files)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/631/A64/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/631/A64/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/631/A64/list?GETtext/xml+votable180.050000true294.25387.56940.0055555555555555566/30519https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/631/A64?format=asciidefaultJ/A+A/631/A64/listList of fits filesNz? Number of slicesmeta.numberintnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension of center (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of center (J2000)degpos.eq.dec;meta.mainNxNumber of pixels along X-axismeta.numberintNy? Number of pixels along Y-axismeta.numberintnullableObs.dateObservation datestime.epoch;obsnullablebFREQ? Lower value of frequency intervalGHzem.freq;stat.minfloatnullableBFREQ? Upper value of frequency intervalGHzem.freq;stat.maxfloatnullabledFREQ? Frequency resolutionHzspect.resolutiondoublenullablesizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fits