Observations of sulfuretted species in HL Tau
P. Rivi\`ere-Marichalar, R. le Gal, A. Fuente, D. Semenov, G. Esplugues, D. Navarro-Almaida, S. Facchini

TL;DR
This study investigates the chemical differences between the envelope and the protoplanetary disk of HL Tau by analyzing molecular line emissions, revealing significant variations in molecular ratios indicative of chemical reprocessing during disk formation.
Contribution
It provides new NOEMA observations of HL Tau's molecular species and compares their spatial distribution and column densities in the disk and envelope, highlighting chemical evolution.
Findings
Large differences in molecular column density ratios between disk and envelope.
Variation in ratios attributed to different excitation and UV-irradiation regimes.
Evidence of chemical reprocessing during disk evolution.
Abstract
Protoplanetary disks inherit their chemical composition from their natal molecular cloud, but the extent to which this material is preserved versus reset through chemical reprocessing remains an open question. Understanding this balance is a major topic in astrochemistry. Comparing the chemical composition of the envelope and the protoplanetary disk is key to solving the topic. The goal of this paper is to investigate the chemical differences between the disk and the surrounding envelope by comparing the column density ratios of a few selected species in each region. The source we focus on is HL Tau. We present new NOEMA observations of HL Tau targeting the following species: CS, H2CO, H2S, and SO2. We produced zeroth-, first-, and second-moment maps for the species where emission was detected and used them to analyze the spatial distribution and kinematic properties of the different…
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Taxonomy
TopicsAstrophysics and Star Formation Studies · Stellar, planetary, and galactic studies · Molecular Spectroscopy and Structure
