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The inventory of prebiotic building blocks around a young, sun-like protostar

dc.contributor.authorLIGTERINK, Niels
hal.structure.identifierLaboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA]
dc.contributor.authorKRISTENSEN, Lars
hal.structure.identifierLeiden Observatory [Leiden]
dc.contributor.authorVAN DISHOECK, Ewine
dc.contributor.authorGARROD, Robin
dc.contributor.authorDROZDOVSKAYA, Maria
dc.contributor.authorJØRGENSEN, Jes Kristian
hal.structure.identifierRaymond and Sackler Laboratory for Astrophysics
dc.contributor.authorLINNARTZ, Harold
hal.structure.identifierCenter for Space and Habitability [CSH]
dc.contributor.authorWAMPFLER, Susanne
dc.contributor.authorCALCUTT, Hannah
hal.structure.identifierAMOR 2018
dc.contributor.authorCOUTENS, Audrey
dc.contributor.authorMÜLLER, Holger
dc.contributor.authorBOURKE, Tyler
dc.date.issued2018
dc.date.conference2018-07-14
dc.description.abstractEnSmall molecules such as methanimine (CH_{2}NH), methylamine (CH _{3}NH _{2}), hydroxylamine (NH _{2}OH) and methyl isocyanate (CH _{3}NCO) belong to a select group of so-called prebiotic molecules that are thought to be at the basis of amino-acid and peptide-bond formation. On Earth, amino-acids are important building blocks of life, which through peptide bonds link with each other to form proteins. Recent ALMA observations have shown for the first time that CH _{2}NH and CH _{3}NCO are present around the low-mass, sun-like, protostar IRAS 16293-2422, showing that prebiotic building blocks could already have been present at the earliest formational stages of our own Solar System. [1][2] This work is conducted as part of the protostellar interferometric line survey, a broad band ALMA survey of the protostellar binary IRAS 16293-2422. The detections of CH _{2}NH and CH _{3}NCO rotational transitions are presented and integrated emission maps show their presence at Solar System scales ( 60 AU) around the protostar. Supporting solid-state laboratory data shows that CH _{3}NCO has its origin in the ice mantles of interstellar dust grains. Non-detections of NH _{2}OH and CH _{3}NH _{2} are used to constrain chemical pathways to interstellar amino-acid formation. Specifically, the abundance comparison of CH3NH2 between this low-mass protostar and the galactic centre source Sgr B2 shows that CH _{3}NH _{2} is depleted by at least 1-2 orders of magnitude in IRAS 16293-2422. This shows that around low-mass protostars CH _{2}NH might be a more relevant precursor to amino-acid formation than CH _{3}NH _{2}. [1] N.F.W. Ligterink et al., Month. Not. Roy. Astron. Soc. 469 (2017) 2219 [2] N.F.W. Ligterink et al., Astronomy & Astrophysics, subm. (2018)
dc.language.isoen
dc.title.enThe inventory of prebiotic building blocks around a young, sun-like protostar
dc.typeCommunication dans un congrès
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Cosmologie et astrophysique extra-galactique [astro-ph.CO]
bordeaux.conference.title42nd COSPAR Scientific Assembly. Held 14-22 July 2018, in Pasadena, California, USA, Abstract id. B1.3-14-18.
bordeaux.countryUS
bordeaux.conference.citypasadena
bordeaux.peerReviewedoui
hal.identifierhal-01901802
hal.version1
hal.invitednon
hal.proceedingsnon
hal.conference.end2018-07-22
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01901802v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.date=2018&rft.au=LIGTERINK,%20Niels&KRISTENSEN,%20Lars&VAN%20DISHOECK,%20Ewine&GARROD,%20Robin&DROZDOVSKAYA,%20Maria&rft.genre=unknown


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