An ALMA view of the circumstellar environment of the post-common-envelope-evolution binary system HD101584

Hans Olofsson, Wouter Vlemmings, Matthias Maercker, Elizabeth Humphreys, Michael Lindqvist, Lars Nyman & Sofia Ramstedt

Chalmers Univ. of Technology, Sweden

HD101584 is among the most powerful proto-PN jet systems, and is unique in having a companion that was engulfed by an AGB star, during which process the stellar envelope was ejected - and survived. We have used 12CO, 13CO, and C18O J=2-1 lines and 1.3 mm continuum ALMA observations to study the circumstellar evolution of the HD101584. It is inferred that the circumstellar medium has a bipolar hour-glass structure, seen almost pole-on, formed by an energetic, about 150 km/s, jet. Significant amount of material resides in an unresolved central region. It is proposed that the circumstellar morphology is related to an event which took place about 500 yr ago, possibly the capture event where the companion spiraled in towards the AGB star. However, the kinetic energy of the accelerated gas exceeds the released orbital energy. Hence, another process must augment, or even dominate, the ejection process. In addition to this, we have detections of line emission from SiO, CS, H2S, SO, SO2, OCS, H2CO, and some of their isotopologues.

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