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Evidence for disks at an early stage in class 0 protostars ?

hal.structure.identifierLaboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA]
dc.contributor.authorGERIN, Maryvonne
hal.structure.identifierLaboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA]
hal.structure.identifierInstitut de RadioAstronomie Millimétrique [IRAM]
dc.contributor.authorPETY, Jérôme
hal.structure.identifierCentre de Recherche Astrophysique de Lyon [CRAL]
dc.contributor.authorCOMMERCON, Benoît
hal.structure.identifierObservatorio Astronomico Nacional, Madrid
dc.contributor.authorFUENTE, Asuncion
hal.structure.identifierInstituto de Ciencia de Materiales de Madrid [ICMM]
dc.contributor.authorCERNICHARO, José
hal.structure.identifierInstituto de Ciencia de Materiales de Madrid [ICMM]
dc.contributor.authorMARCELINO, Nuria
hal.structure.identifierLaboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA]
dc.contributor.authorCIARDI, Andrea
hal.structure.identifierLaboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA]
dc.contributor.authorLIS, Darek
hal.structure.identifierLaboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA]
dc.contributor.authorROUEFF, Evelyne
hal.structure.identifierNational Radio Astronomy Observatory [Socorro] [NRAO]
dc.contributor.authorWOOTTEN, A. Henry
hal.structure.identifierAMOR 2017
hal.structure.identifierInstitut de RadioAstronomie Millimétrique [IRAM]
dc.contributor.authorCHAPILLON, E.
dc.date.issued2017
dc.identifier.issn0004-6361
dc.description.abstractEnThe formation epoch of protostellar disks is debated because of the competing roles of rotation, turbulence, and magnetic fields in the early stages of low-mass star formation. Magnetohydrodynamics simulations of collapsing cores predict that rotationally supported disks may form in strongly magnetized cores through ambipolar diffusion or misalignment between the rotation axis and the magnetic field orientation. Detailed studies of individual sources are needed to cross check the theoretical predictions. We present 0.06 - 0.1 arcsec resolution images at 350~GHz toward B1b-N and B1b-S, which are young class 0 protostars, possibly first hydrostatic cores. The images have been obtained with ALMA, and we compare these data with magnetohydrodynamics simulations of a collapsing turbulent and magnetized core. The submillimeter continuum emission is spatially resolved by ALMA. Compact structures with optically thick 350~GHz emission are detected toward both B1b-N and B1b-S, with 0.2 and 0.35 arcsec radii (46 and 80~au at the Perseus distance of 230~pc), within a more extended envelope. The flux ratio between the compact structure and the envelope is lower in B1b-N than in B1b-S, in agreementwith its earlier evolutionary status. The size and orientation of the compact structure are consistent with 0.2 arcsec resolution 32~GHz observations obtained with the Very Large Array as a part of the VANDAM survey, suggesting that grains have grown through coagulation. The morphology, temperature, and densities of the compact structures are consistent with those of disks formed in numerical simulationsof collapsing cores. Moreover, the properties of B1b-N are consistent with those of a very young protostar, possibly a first hydrostatic core. These observations provide support for the early formation of disks around low-mass protostars.
dc.description.sponsorshipMolecules interstellaires : spectroscopie et synthèse en laboratoire - ANR-13-BS05-0008
dc.language.isoen
dc.publisherEDP Sciences
dc.subject.enISM: dense cores
dc.subject.enISM : low- mass star formation
dc.subject.enISM : Barnard 1b
dc.title.enEvidence for disks at an early stage in class 0 protostars ?
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361/201630187
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Cosmologie et astrophysique extra-galactique [astro-ph.CO]
dc.identifier.arxiv1709.07702
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.pageid.A35
bordeaux.volume606
bordeaux.peerReviewedoui
hal.identifierhal-01577450
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01577450v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Astronomy%20and%20Astrophysics%20-%20A&A&rft.date=2017&rft.volume=606&rft.spage=id.A35&rft.epage=id.A35&rft.eissn=0004-6361&rft.issn=0004-6361&rft.au=GERIN,%20Maryvonne&PETY,%20J%C3%A9r%C3%B4me&COMMERCON,%20Beno%C3%AEt&FUENTE,%20Asuncion&CERNICHARO,%20Jos%C3%A9&rft.genre=article


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