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dc.contributor.authorSahai, Raghvendra
dc.contributor.authorVlemmings, W.H.T.
dc.contributor.authorGledhill, Timothy
dc.contributor.authorSanchez Contreras, Carmen
dc.contributor.authorLagadec, Eric
dc.contributor.authorNyman, L.A.
dc.contributor.authorQuintana-Lacaci, G.
dc.date.accessioned2017-02-13T19:10:31Z
dc.date.available2017-02-13T19:10:31Z
dc.date.issued2017-01-20
dc.identifier.citationSahai , R , Vlemmings , W H T , Gledhill , T , Sanchez Contreras , C , Lagadec , E , Nyman , L A & Quintana-Lacaci , G 2017 , ' ALMA Observations of the Water Fountain Pre-Planetary Nebula IRAS 16342-3814: High-velocity bipolar jets and an Expanding Torus ' , The Astrophysical Journal , vol. 835 , L13 . https://doi.org/10.3847/2041-8213/835/1/l13
dc.identifier.issn0004-637X
dc.identifier.otherPURE: 10850739
dc.identifier.otherPURE UUID: ee253894-1ac7-43d4-acac-71451cad5648
dc.identifier.otherScopus: 85011298949
dc.identifier.otherORCID: /0000-0002-2859-4600/work/30779748
dc.identifier.urihttp://hdl.handle.net/2299/17630
dc.descriptionR. Sahai, W.H.T. Vlemmings, T. Gledhill, C. Sanchez Contreras, E. Lagadec, L-A Nyman, and G. Quintana-Lacaci, ‘ALMA Observations of the Water Fountain Pre-planetary Nebula IRAS 16342-3814: High-velocity Bipolar Jets and an Expanding Torus’, The Astrophysical Journal Letters, Vol 835: L13 (6 pp), published 20 January 2017. The version of record is available online via doi: 10.3847/2041-8213/835/1/L13 © 2017. The American Astronomical Society. All rights reserved.
dc.description.abstractWe have mapped 12CO J=3–2 and other molecular lines from the “water fountain” bipolar pre-planetary nebula (PPN) IRAS 16342-3814 with ∼0.35″ resolution using Atacama Large Millimeter/submillimeter Array. We find (i) two very high-speed knotty, jet-like molecular outflows; (ii) a central high-density (>few x106 cm−3), expanding torus of diameter 1300 au; and (iii) the circumstellar envelope of the progenitor AGB, generated by a sudden, very large increase in the mass-loss rate to >3.5 x10-4 Ms yr−1 in the past ∼455 years. Strong continuum emission at 0.89 mm from a central source (690 mJy), if due to thermally emitting dust, implies a substantial mass (0.017 Ms) of very large (∼millimeter-sized) grains. The measured expansion ages of the above structural components imply that the torus (age∼160 years) and the younger high-velocity outflow (age∼110 years) were formed soon after the sharp increase in the AGB mass-loss rate. Assuming a binary model for the jets in IRAS 16342, the high momentum rate for the dominant jet-outflow in IRAS 16342 implies a high minimum accretion rate, ruling out standard Bondi–Hoyle–Lyttleton wind accretion and wind Roche-lobe overflow (RLOF) models with white-dwarf or main-sequence companions. Most likely, enhanced RLOF from the primary or accretion modes operating within common-envelope evolution are needed.en
dc.format.extent6
dc.language.isoeng
dc.relation.ispartofThe Astrophysical Journal
dc.subjectcircumstellar matter
dc.subjectstars: AGB and post-AGB
dc.subjectstars: mass-loss
dc.subjectstars: winds, outflows
dc.subjecttechniques: interferometric
dc.titleALMA Observations of the Water Fountain Pre-Planetary Nebula IRAS 16342-3814: High-velocity bipolar jets and an Expanding Torusen
dc.contributor.institutionCentre for Astrophysics Research
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.description.statusPeer reviewed
rioxxterms.versionVoR
rioxxterms.versionofrecordhttps://doi.org/10.3847/2041-8213/835/1/l13
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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