The inventory of prebiotic building blocks around a young, sun-like protostar
| dc.contributor.author | LIGTERINK, Niels | |
| hal.structure.identifier | Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA] | |
| dc.contributor.author | KRISTENSEN, Lars | |
| hal.structure.identifier | Leiden Observatory [Leiden] | |
| dc.contributor.author | VAN DISHOECK, Ewine | |
| dc.contributor.author | GARROD, Robin | |
| dc.contributor.author | DROZDOVSKAYA, Maria | |
| dc.contributor.author | JØRGENSEN, Jes Kristian | |
| hal.structure.identifier | Raymond and Sackler Laboratory for Astrophysics | |
| dc.contributor.author | LINNARTZ, Harold | |
| hal.structure.identifier | Center for Space and Habitability [CSH] | |
| dc.contributor.author | WAMPFLER, Susanne | |
| dc.contributor.author | CALCUTT, Hannah | |
| hal.structure.identifier | AMOR 2018 | |
| dc.contributor.author | COUTENS, Audrey | |
| dc.contributor.author | MÜLLER, Holger | |
| dc.contributor.author | BOURKE, Tyler | |
| dc.date.issued | 2018 | |
| dc.date.conference | 2018-07-14 | |
| dc.description.abstractEn | Small 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.iso | en | |
| dc.title.en | The inventory of prebiotic building blocks around a young, sun-like protostar | |
| dc.type | Communication dans un congrès | |
| dc.subject.hal | Planète et Univers [physics]/Astrophysique [astro-ph]/Cosmologie et astrophysique extra-galactique [astro-ph.CO] | |
| bordeaux.conference.title | 42nd COSPAR Scientific Assembly. Held 14-22 July 2018, in Pasadena, California, USA, Abstract id. B1.3-14-18. | |
| bordeaux.country | US | |
| bordeaux.conference.city | pasadena | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-01901802 | |
| hal.version | 1 | |
| hal.invited | non | |
| hal.proceedings | non | |
| hal.conference.end | 2018-07-22 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-01901802v1 | |
| bordeaux.COinS | ctx_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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