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SPARKS II.: Complex organic molecules in accretion shocks around a hot core precursor

hal.structure.identifierFORMATION STELLAIRE 2019
hal.structure.identifierMax-Planck-Institut für Radioastronomie [MPIFR]
dc.contributor.authorCSENGERI, Timea
hal.structure.identifierMax-Planck-Institut für Radioastronomie [MPIFR]
dc.contributor.authorBELLOCHE, A.
hal.structure.identifierFORMATION STELLAIRE 2019
dc.contributor.authorBONTEMPS, Sylvain
hal.structure.identifierMax-Planck-Institut für Radioastronomie [MPIFR]
dc.contributor.authorWYROWSKI, F.
hal.structure.identifierMax-Planck-Institut für Radioastronomie [MPIFR]
dc.contributor.authorMENTEN, K. M.
hal.structure.identifierMax-Planck-Institut für Radioastronomie [MPIFR]
dc.contributor.authorBOUSCASSE, L.
dc.date.issued2019
dc.identifier.issn0004-6361
dc.description.abstractEnClassical hot cores are rich in molecular emission, and they show a high abundance of complex organic molecules (COMs). The emergence of molecular complexity is poorly constrained in the early evolution of hot cores. Using the Atacama Large Millimeter Array we put observational constraints on the physical location of COMs in a high-mass protostellar envelope associated with the G328.2551-0.5321 clump. The protostar is single down to ~400au scales and we resolve the emission region of COMs. Using thermodynamic equilibrium modelling of the available 7.5 GHz bandwidth around ~345 GHz, we detect emission from 10 COMs, and identify a line of deuterated water (HDO). The most extended emission originates from methanol, methyl formate and formamide. Together with HDO, these molecules are found to be associated with both the accretion shocks and the inner envelope, for which we estimate a moderate temperature of $T_{\rm kin}\sim$110 K. Our findings reveal a significant difference in the distribution of COMs. O-bearing COMs, such as ethanol, acetone, and ethylene glycol are almost exclusively found and show a higher abundance towards the accretion shocks with $T_{\rm kin}\sim$180 K. Whereas N-bearing COMs with a CN group, such as vinyl and ethyl cyanide peak on the central position, thus the protostar and the accretion disk. This is the first observational evidence for a large column density of COMs seen towards accretion shocks at the centrifugal barrier at the inner envelope. Since the molecular composition is dominated by that of the accretion shocks and the radiatively heated hot inner region is very compact, we propose this source to be a precursor to a classical, radiatively heated hot core.
dc.language.isoen
dc.publisherEDP Sciences
dc.subject.enAstrophysics - Astrophysics of Galaxies
dc.title.enSPARKS II.: Complex organic molecules in accretion shocks around a hot core precursor
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361/201935226
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Astrophysique galactique [astro-ph.GA]
dc.identifier.arxiv1910.05830
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.pageAccepted for publication in A&A
bordeaux.peerReviewedoui
hal.identifierhal-02317422
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02317422v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Astronomy%20and%20Astrophysics%20-%20A&A&rft.date=2019&rft.spage=Accepted%20for%20publication%20in%20A&A&rft.epage=Accepted%20for%20publication%20in%20A&A&rft.eissn=0004-6361&rft.issn=0004-6361&rft.au=CSENGERI,%20Timea&BELLOCHE,%20A.&BONTEMPS,%20Sylvain&WYROWSKI,%20F.&MENTEN,%20K.%20M.&rft.genre=article


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