dc.contributor.author | Sahai, Raghvendra | |
dc.contributor.author | Vlemmings, W.H.T. | |
dc.contributor.author | Gledhill, Timothy | |
dc.contributor.author | Sanchez Contreras, Carmen | |
dc.contributor.author | Lagadec, Eric | |
dc.contributor.author | Nyman, L.A. | |
dc.contributor.author | Quintana-Lacaci, G. | |
dc.date.accessioned | 2017-02-13T19:10:31Z | |
dc.date.available | 2017-02-13T19:10:31Z | |
dc.date.issued | 2017-01-20 | |
dc.identifier.citation | Sahai , 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.issn | 0004-637X | |
dc.identifier.other | ORCID: /0000-0002-2859-4600/work/30779748 | |
dc.identifier.uri | http://hdl.handle.net/2299/17630 | |
dc.description | R. 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.abstract | We 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.extent | 6 | |
dc.format.extent | 2550755 | |
dc.language.iso | eng | |
dc.relation.ispartof | The Astrophysical Journal | |
dc.subject | circumstellar matter | |
dc.subject | stars: AGB and post-AGB | |
dc.subject | stars: mass-loss | |
dc.subject | stars: winds, outflows | |
dc.subject | techniques: interferometric | |
dc.title | ALMA Observations of the Water Fountain Pre-Planetary Nebula IRAS 16342-3814: High-velocity bipolar jets and an Expanding Torus | en |
dc.contributor.institution | Centre for Astrophysics Research (CAR) | |
dc.contributor.institution | School of Physics, Astronomy and Mathematics | |
dc.description.status | Peer reviewed | |
rioxxterms.versionofrecord | 10.3847/2041-8213/835/1/l13 | |
rioxxterms.type | Journal Article/Review | |
herts.preservation.rarelyaccessed | true | |