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ALMA Observations of the Water Fountain Pre-planetary Nebula IRAS 16342-3814: High-velocity Bipolar Jets and an Expanding Torus

R. Sahai ; Wouter Vlemmings (Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik) ; T. Gledhill ; C. Sánchez Contreras ; E. Lagadec ; L. A. Nyman ; G. Quintana-Lacaci
Astrophysical Journal Letters (2041-8205). Vol. 835 (2017), 1,
[Artikel, refereegranskad vetenskaplig]

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 ( 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 M o 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 M o) 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.

Nyckelord: circumstellar matter; stars: AGB and post-AGB; stars: mass-loss; stars: winds, outflows; techniques: interferometric



Denna post skapades 2017-03-03. Senast ändrad 2017-03-31.
CPL Pubid: 248406

 

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Institutioner (Chalmers)

Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik (2010-2017)

Ämnesområden

Fusion, plasma och rymdfysik

Chalmers infrastruktur