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Phosphorus is a key ingredient in terrestrial biochemistry, but is rarelyobserved in the molecular ISM and therefore little is known about how it isinherited during the star and planet formation sequence. We presentobservations of the phosphorus-bearing molecules PO and PN towards the Class Ilow-mass protostar B1-a using the IRAM 30m telescope, representing the seconddetection of phosphorus carriers in a Solar-type star forming region. The P/Habundance contained in PO and PN is ~10$^{-10}$-10$^{-9}$ depending on theassumed source size, accounting for just 0.05-0.5% of the solar phosphorusabundance and implying significant sequestration of phosphorus in refractorymaterial. Based on a comparison of the PO and PN line profiles with the shocktracers SiO, SO$_2$, and CH$_3$OH, the phosphorus molecule emission seems tooriginate from shocked gas and is likely associated with a protostellaroutflow. We find a PO/PN column density ratio of ~1-3, which is consistent withthe values measured in the shocked outflow of the low-mass protostar L1157, themassive star-forming regions W51 and W3(OH), and the galactic center GMCG+0.693-0.03. This narrow range of PO/PN ratios across sources with a range ofenvironmental conditions is surprising, and likely encodes information on howphosphorus carriers are stored in grain mantles.

Detection of phosphorus-bearing molecules towards a Solar-type protostar