ALMA view of the circumstellar environment of the post-common-envelope-evolution binary system HD 101584
Artikel i vetenskaplig tidskrift, 2015

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.

stars: AGB and post-AGB

stars: individual: HD 101584

circumstellar matter

radio lines: stars

stars: mass-loss

Författare

Hans Olofsson

Chalmers, Rymd- och geovetenskap, Radioastronomi och astrofysik

Wouter Vlemmings

Chalmers, Rymd- och geovetenskap, Radioastronomi och astrofysik

Matthias Maercker

Chalmers, Rymd- och geovetenskap, Radioastronomi och astrofysik

E. M. Humphreys

European Southern Observatory (ESO)

Michael Lindqvist

Chalmers, Rymd- och geovetenskap, Onsala rymdobservatorium

L. Nyman

European Southern Observatory Santiago

Atacama Large Millimeter-submillimeter Array (ALMA)

S. Ramstedt

Uppsala universitet

Astronomy and Astrophysics

0004-6361 (ISSN) 1432-0746 (eISSN)

Vol. 576 L15

Magnetic fields and the outflows during the formation and evolution of stars (OUTFLOWMAGN)

Europeiska kommissionen (FP7), 2014-05-01 -- 2019-04-30.

Ämneskategorier

Astronomi, astrofysik och kosmologi

Fundament

Grundläggande vetenskaper

Infrastruktur

Onsala rymdobservatorium

DOI

10.1051/0004-6361/201526026