Interstellar complex organic molecules in the prototypical Class I protostar SVS13-A: From large scales to planet forming disks

Univ. Grenoble Alpes, CNRS, IPAG, 38000 Grenoble, France

^* e-mail: eleonora.bianchi@univ-grenoble-alpes.fr

Published online: 7 September 2022

Abstract

We present a chemical systematic study of the Class I object SVS13- A obtained in the framework of two IRAM Large Programs: ASAI (Astrochemical Survey At IRAM-30m) with the 30m and SOLIS (Seeds Of Life In Space) with NOEMA. Thanks to the ASAI high-sensitivity unbiased spectral survey of the 3, 2 and 1.3mm bands, we detect and analyse several emission lines from deuterated species and interstellar complex organic molecules (iCOMs, e.g. molecules composed by 6 or more atoms and based on carbon). Within SOLIS, we obtain high-sensitivity and high-spatial resolution (∼ 180 au) maps of crucial iCOMs. As a follow up, thanks to ALMA we explore the chemistry in the planet forming region (∼ 50 au). We image emission lines from methanol (CH₃OH), acetaldehyde (CH₃CHO), formamide (NH₂CHO) and dimethyl ether (CH₃OCH₃). The different spatial distributions suggest a chemical differentiation inside the binary system or a different continuum opacity in the two protostellar disks.