Discovery of a 500 au Protobinary in the Massive Prestellar Core G11.92−0.61 MM2
dc.contributor.author | Cyganowski, CJ | |
dc.contributor.author | Ilee, JD | |
dc.contributor.author | Brogan, CL | |
dc.contributor.author | Hunter, TR | |
dc.contributor.author | Zhang, S | |
dc.contributor.author | Harries, TJ | |
dc.contributor.author | Haworth, TJ | |
dc.date.accessioned | 2022-04-25T13:59:22Z | |
dc.date.issued | 2022-06-01 | |
dc.date.updated | 2022-04-25T13:10:35Z | |
dc.description.abstract | We 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.sponsorship | SFC | en_GB |
dc.description.sponsorship | Science and Technology Facilities Council (STFC) | en_GB |
dc.description.sponsorship | China Scholarship Council–University of St Andrews | en_GB |
dc.description.sponsorship | Royal Society | en_GB |
dc.identifier.citation | Vol. 931 (2), article L31 | en_GB |
dc.identifier.doi | 10.3847/2041-8213/ac69ca | |
dc.identifier.grantnumber | SFC/AN/08/020 | en_GB |
dc.identifier.grantnumber | ST/T000287/1 | en_GB |
dc.identifier.grantnumber | 201806190010 | en_GB |
dc.identifier.uri | http://hdl.handle.net/10871/129449 | |
dc.identifier | ORCID: 0000-0001-8228-9503 (Harries, Timothy) | |
dc.language.iso | en | en_GB |
dc.publisher | American Astronomical Society / IOP Publishing | en_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.subject | stars: formation | en_GB |
dc.subject | stars: protostars | en_GB |
dc.subject | ISM: individual objects (G11.92-0.61 MM2) | en_GB |
dc.subject | ISM: jets and outflows | en_GB |
dc.subject | accretion, accretion disks | en_GB |
dc.title | Discovery of a 500 au Protobinary in the Massive Prestellar Core G11.92−0.61 MM2 | en_GB |
dc.type | Article | en_GB |
dc.date.available | 2022-04-25T13:59:22Z | |
dc.identifier.issn | 2041-8213 | |
dc.description | This is the final version. Available on open access from IOP Publishing via the DOI in this record | en_GB |
dc.identifier.journal | Astrophysical Journal Letters | en_GB |
dc.rights.uri | https://creativecommons.org/licenses/by/4.0/ | en_GB |
dcterms.dateAccepted | 2022-04-23 | |
rioxxterms.version | VoR | en_GB |
rioxxterms.licenseref.startdate | 2022-04-23 | |
rioxxterms.type | Journal Article/Review | en_GB |
refterms.dateFCD | 2022-04-25T13:10:38Z | |
refterms.versionFCD | AM | |
refterms.dateFOA | 2022-06-30T09:58:51Z | |
refterms.panel | B | en_GB |
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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.