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dc.contributor.authorCyganowski, CJ
dc.contributor.authorIlee, JD
dc.contributor.authorBrogan, CL
dc.contributor.authorHunter, TR
dc.contributor.authorZhang, S
dc.contributor.authorHarries, TJ
dc.contributor.authorHaworth, TJ
dc.date.accessioned2022-04-25T13:59:22Z
dc.date.issued2022-06-01
dc.date.updated2022-04-25T13:10:35Z
dc.description.abstractWe present high-resolution (160au) Atacama Large Millimeter/submillimeter Array (ALMA) 1.3 mm observations of the high-mass prestellar core candidate G11.92−0.61 MM2, which reveal that this source is in fact a protobinary system with a projected separation of 505au. The binary components, MM2E and MM2W, are compact (radii<140au) sources within the partially optically thick dust emission with α0.9cm−1.3mm =2.47–2.94. The 1.3 mm brightness temperatures, Tb =68.4/64.6K for MM2E/MM2W, imply internal heating and minimum luminosities L∗ >24.7Lfor MM2E and L∗ >12.6Lfor MM2W. The compact sources are connected by a “bridge” of lower-surface-brightness dust emission and lie within more extended emission that may correspond to a circumbinary disk. The circumprotostellar gas mass, estimated from ∼0.2-resolution VLA 0.9cm observations assuming optically thin emission, is 6.8±0.9 M. No line emission is detected towards MM2E and MM2W in our high-resolution 1.3mm ALMA observations. The only line detected is 13CO J=2-1, in absorption against the 1.3mm continuum, which likely traces a layer of cooler molecular material surrounding the protostars. We also report the discovery of a highly asymmetric bipolar molecular outflow that appears to be driven by MM2E and/or MM2W in new deep, ∼0.5-resolution (1680au) ALMA 0.82mm observations. This outflow, traced by low-excitation CH3OH emission, indicates ongoing accretion onto the protobinary system. Overall, the super-Alfv´enic models of Mignon-Risse et al. (2021) agree well with the observed properties of the MM2E/MM2W protobinary, suggesting that this system may be forming in an environment with a weak magnetic field.en_GB
dc.description.sponsorshipSFCen_GB
dc.description.sponsorshipScience and Technology Facilities Council (STFC)en_GB
dc.description.sponsorshipChina Scholarship Council–University of St Andrewsen_GB
dc.description.sponsorshipRoyal Societyen_GB
dc.identifier.citationVol. 931 (2), article L31en_GB
dc.identifier.doi10.3847/2041-8213/ac69ca
dc.identifier.grantnumberSFC/AN/08/020en_GB
dc.identifier.grantnumberST/T000287/1en_GB
dc.identifier.grantnumber201806190010en_GB
dc.identifier.urihttp://hdl.handle.net/10871/129449
dc.identifierORCID: 0000-0001-8228-9503 (Harries, Timothy)
dc.language.isoenen_GB
dc.publisherAmerican Astronomical Society / IOP Publishingen_GB
dc.rights© 2022. The Author(s). Published by the American Astronomical Society. Open access. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
dc.subjectstars: formationen_GB
dc.subjectstars: protostarsen_GB
dc.subjectISM: individual objects (G11.92-0.61 MM2)en_GB
dc.subjectISM: jets and outflowsen_GB
dc.subjectaccretion, accretion disksen_GB
dc.titleDiscovery of a 500 au Protobinary in the Massive Prestellar Core G11.92−0.61 MM2en_GB
dc.typeArticleen_GB
dc.date.available2022-04-25T13:59:22Z
dc.identifier.issn2041-8213
dc.descriptionThis is the final version. Available on open access from IOP Publishing via the DOI in this recorden_GB
dc.identifier.journalAstrophysical Journal Lettersen_GB
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en_GB
dcterms.dateAccepted2022-04-23
rioxxterms.versionVoRen_GB
rioxxterms.licenseref.startdate2022-04-23
rioxxterms.typeJournal Article/Reviewen_GB
refterms.dateFCD2022-04-25T13:10:38Z
refterms.versionFCDAM
refterms.dateFOA2022-06-30T09:58:51Z
refterms.panelBen_GB


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© 2022. The Author(s). Published by the American Astronomical Society. Open access. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Except where otherwise noted, this item's licence is described as © 2022. The Author(s). Published by the American Astronomical Society. Open access. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.