Lefloch, B;
Vastel, C;
Viti, S;
Jimenez-Serra, I;
Codella, C;
Podio, L;
Ceccarelli, C;
... Bachiller, R; + view all
(2016)
Phosphorus-bearing molecules in solar-type star-forming regions: first PO detection.
Monthly Notices of the Royal Astronomical Society
, 462
(4)
pp. 3937-3944.
10.1093/mnras/stw1918.
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Abstract
As part of the Large Program Astrochemical Surveys At IRAM, we have used the IRAM 30 m telescope to lead a systematic search for the emission of rotational transitions of P-bearing species between 80 and 350 GHz towards L1157-B1, a shock position in the solar-type star-forming region L1157. We report the detection of several transitions of PN and, for the first time, of pre-biotic molecule PO. None of these species are detected towards the driving protostar of the outflow L1157-mm. Analysis of the line profiles shows that PN arises from the outflow cavity, where SiO, a strong shock tracer, is produced. Radiative transfer analysis yields an abundance of 2.5 × 10−9 and 0.9 × 10−9 for PO and PN, respectively. These results imply a strong depletion (≈100) of phosphorus in the quiescent cloud gas. Shock modelling shows that atomic N plays a major role in the chemistry of PO and PN. The relative abundance of PO and PN brings constraints both on the duration of the pre-shock phase, which has to be ∼106 yr, and on the shock parameters. The maximum temperature in the shock has to be larger than 4000 K, which implies a shock velocity of 40 km s−1.
Type: | Article |
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Title: | Phosphorus-bearing molecules in solar-type star-forming regions: first PO detection |
Open access status: | An open access version is available from UCL Discovery |
DOI: | 10.1093/mnras/stw1918 |
Publisher version: | http://dx.doi.org/10.1093/mnras/stw1918 |
Language: | English |
Additional information: | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society, copyright © 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Keywords: | astrochemistry, stars: formation, ISM: abundances, ISM: jets and outflows, ISM: molecules |
UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
URI: | https://discovery-pp.ucl.ac.uk/id/eprint/1529846 |
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