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http://hdl.handle.net/20.500.12386/27339
Title: | Phosphorus-bearing molecules in solar-type star-forming regions: first PO detection | Authors: | Lefloch, Bertrand Vastel, C. Viti, S. Jimenez-Serra, I. CODELLA, CLAUDIO PODIO, LINDA Ceccarelli, C. Mendoza, E. Lepine, J. R. D. Bachiller, R. |
Issue Date: | 2016 | Journal: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Number: | 462 | Issue: | 4 | First Page: | 3937 | 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<SUP>-9</SUP> and 0.9 × 10<SUP>-9</SUP> 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 ∼10<SUP>6</SUP> 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<SUP>-1</SUP>. | URI: | http://hdl.handle.net/20.500.12386/27339 | URL: | https://academic.oup.com/mnras/article/462/4/3937/2589897 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stw1918 | Bibcode ADS: | 2016MNRAS.462.3937L | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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stw1918.pdf | PDF editoriale | 931.33 kB | Adobe PDF | View/Open |
1608.00048.pdf | postprint | 342.96 kB | Adobe PDF | View/Open |
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