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ALMA view of the circumstellar environment of the post-common-envelope-evolution binary system HD 101584
Chalmers, Onsala Space Observ, Dept Earth & Space Sci, S-43992 Onsala, Sweden..
Chalmers, Onsala Space Observ, Dept Earth & Space Sci, S-43992 Onsala, Sweden..
Chalmers, Onsala Space Observ, Dept Earth & Space Sci, S-43992 Onsala, Sweden..
ESO, D-85748 Garching, Germany..
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2015 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 576, L15Article in journal (Refereed) PublishedText
Abstract [en]

Aims. We study the circumstellar evolution of the binary HD 101584, consisting of a post-AGB star and a low-mass companion, which is most likely a post-common-envelope-evolution system. Methods. We used ALMA observations of the (CO)-C-12, (CO)-C-13, and (CO)-O-18 J = 2-1 lines and the 1.3 mm continuum to determine the morphology, kinematics, masses, and energetics of the circumstellar environment. Results. The circumstellar medium has a bipolar hour-glass structure, seen almost pole-on, formed by an energetic jet, approximate to 150 km s(-1). We conjecture that the circumstellar morphology is related to an event that took place approximate to 500 yr ago, possibly a capture event where the companion spiraled in towards the AGB star. However, the kinetic energy of the accelerated gas exceeds the released orbital energy, and, taking into account the expected energy transfer efficiency of the process, the observed phenomenon does not match current common-envelope scenarios. This suggests that another process must augment, or even dominate, the ejection process. A significant amount of material resides in an unresolved region, presumably in the equatorial plane of the binary system.

Place, publisher, year, edition, pages
2015. Vol. 576, L15
Keyword [en]
circumstellar matter, stars: individual: HD 101584, stars: mass-loss, stars: AGB and post-AGB, radio lines: stars
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:uu:diva-269780DOI: 10.1051/0004-6361/201526026ISI: 000357274600086OAI: oai:DiVA.org:uu-269780DiVA: diva2:885399
Available from: 2015-12-18 Created: 2015-12-18 Last updated: 2015-12-18Bibliographically approved

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