# First detection of methanol towards a post-AGB object, HD101584

## TL;DR

This paper reports the first detection of methanol in a post-AGB star, HD101584, revealing complex molecular chemistry likely driven by shock interactions in its circumstellar environment.

## Contribution

It presents the first observation of methanol in a post-AGB object and analyzes its origin through high-resolution ALMA data.

## Key findings

- Detection of CH3OH in HD101584
- Evidence of shock-induced chemistry in the circumstellar medium
- HD101584 likely evolved from a low-mass M-type AGB star

## Abstract

The circumstellar environments of objects on the asymptotic giant branch and beyond are rich in molecular species. Nevertheless, methanol has never been detected in such an object, and is therefore often taken as a clear signpost for a young stellar object. However, we report the first detection of CH3OH in a post-AGB object, HD101584, using ALMA. Its emission, together with emissions from CO, SiO, SO, CS, and H2CO, comes from two extreme velocity spots on either side of the object where a high-velocity outflow appears to interact with the surrounding medium. We have derived molecular abundances, and propose that the detected molecular species are the effect of a post-shock chemistry where circumstellar grains play a role. We further provide evidence that HD101584 was a low-mass, M-type AGB star.