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ALMA Observations o...
ALMA Observations of the Water Fountain Pre-planetary Nebula IRAS 16342-3814: High-velocity Bipolar Jets and an Expanding Torus
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Sahai, R. (författare)
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- Vlemmings, Wouter, 1974 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Gledhill, T. (författare)
- University of Hertfordshire
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- Contreras, C. Sánchez (författare)
- Centro de Astrobiologia (CAB)
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- Lagadec, E. (författare)
- Observatoire de la Cote d'Azur
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- Nyman, Lars-Åke, 1954 (författare)
- Atacama Large Millimeter-submillimeter Array (ALMA),European Southern Observatory Santiago
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- Quintana-Lacaci, G. (författare)
- CSIC - Instituto de Ciencia de Materiales de Madrid (ICMM)
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(creator_code:org_t)
- 2017
- 2017
- Engelska.
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Ingår i: Astrophysical Journal Letters. - 2041-8213 .- 2041-8205. ; 835:1
- Relaterad länk:
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http://publications.... (primary) (free)
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https://research.cha...
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https://doi.org/10.3...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
Nyckelord
- techniques: interferometric
- stars: winds
- circumstellar matter
- outflows
- stars: AGB and post-AGB
- stars: mass-loss
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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