SIMBAD references

2016MNRAS.462.3937L - Mon. Not. R. Astron. Soc., 462, 3937-3944 (2016/November-2)

Phosphorus-bearing molecules in solar-type star-forming regions: first PO detection.

LEFLOCH B., VASTEL C., VITI S., JIMENEZ-SERRA I., CODELLA C., PODIO L., CECCARELLI C., MENDOZA E., LEPINE J.R.D. and BACHILLER R.

Abstract (from CDS):

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 x 10–9 and 0.9 x 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.

Abstract Copyright: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): astrochemistry - stars: formation - ISM: abundances - ISM: jets and outflows - ISM: molecules - ISM: molecules

Simbad objects: 15

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2020.09.22-04:34:38

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