ALMA Observations of the Water Fountain Pre-Planetary Nebula IRAS 16342-3814: High-Velocity Bipolar Jets and an Expanding Torus
| Autor: | G. Quintana-Lacaci, Tim Gledhill, Lars-Åke Nyman, Raghvendra Sahai, Wouter Vlemmings, Eric Lagadec, C. Sánchez Contreras |
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| Přispěvatelé: | European Research Council, Ministerio de Economía y Competitividad (España) |
| Rok vydání: | 2017 |
| Předmět: |
High velocity
FOS: Physical sciences Astrophysics 7. Clean energy 01 natural sciences Article Common envelope 0103 physical sciences Roche lobe Stars: mass-loss winds outflows [Stars] 010303 astronomy & astrophysics Solar and Stellar Astrophysics (astro-ph.SR) Physics Nebula mass-loss [Stars] 010308 nuclear & particles physics Stars: AGB and post-AGB Astronomy and Astrophysics Torus Circumstellar envelope Circumstellar matter AGB and post-AGB [Stars] Planetary nebula Astrophysics - Astrophysics of Galaxies Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) Techniques: interferometric interferometric [Techniques] Outflow Stars: winds outflows |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| ISSN: | 2041-8205 |
| Popis: | We have mapped CO 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), 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 yr 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 ) 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. R.S.'s contribution to this research was carried out at JPL, California Institute of Technology, under a contract with NASA. W. V., C. S. C., and G. Q.-L. acknowledge support from ERC consolidator grant 614264, Spanish MINECO grant AYA2012-32032, and ERC Grant Agreement 610256 (NANOCOSMOS), respectively. |
| Databáze: | OpenAIRE |
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