Phosphorus-bearing molecules in solar-type star-forming regions: first PO detection
Date Issued
2016
Author(s)
Lefloch, Bertrand
•
Vastel, C.
•
Viti, S.
•
Jimenez-Serra, I.
•
•
•
Ceccarelli, C.
•
Mendoza, E.
•
Lepine, J. R. D.
•
Bachiller, R.
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.
Volume
462
Issue
4
Start page
3937
Issn Identifier
0035-8711
Ads BibCode
2016MNRAS.462.3937L
Rights
open.access
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