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

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.
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Submitted on : Monday, May 16, 2022 - 4:29:41 PM
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Bertrand Lefloch, C. Vastel, S. Viti, I. Jimenez-Serra, C. Codella, et al.. Phosphorus-bearing molecules in solar-type star-forming regions: first PO detection. Monthly Notices of the Royal Astronomical Society, 2016, 462, pp.3937-3944. ⟨10.1093/mnras/stw1918⟩. ⟨insu-03669403⟩



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