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

Abstract

As part of the Large Program ASAI (Astrochemical Surveys At IRAM), we have used the IRAM 30m 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 prebiotic 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 2.5e-9 and 0.9e-9 for PO and PN, respectively. These results imply a strong depletion (approx 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 about 1 Myr, and on the shock parameters. The maximum temperature in the shock has to be larger than 4000K, which implies a shock velocity of 40 km/s.

arXiv comment9 pages, 4 figures

References in corpus (13)

• The chemical composition of the Sun
• Evaporation of ices near massive stars: models based on laboratory TPD data
• Parametrization of C-shocks. Evolution of the Sputtering of Grains
• The CHESS chemical Herschel surveys of star forming regions: Peering into the protostellar shock L1157-B1. I. Shock chemical complexity
• First detections of the key prebiotic molecule PO in star-forming regions
• PO and PN in the wind of the oxygen-rich AGB star IK Tau
• The CHESS survey of the L1157-B1 shock region: CO spectral signatures of jet-driven bowshocks
• L1157-B1: Water and ammonia as diagnostics of shock temperature
• Phosphorus-bearing molecules in massive dense cores
• The B1 shock in the L1157 outflow as seen at high spatial resolution
• The density structure of the L1157 molecular outflow
• Phosphorous chemistry in the shocked region L1157 B1
• The origin and structure of clumps along molecular outflows: the test case of CB3

Cited by in corpus (35)

• Astrochemistry and compositions of planetary systems
• UCLCHEM: A Gas-Grain Chemical Code
• Astrochemical evolution along star formation: Overview of the IRAM Large Program ASAI
• ALMA and ROSINA detections of phosphorus-bearing molecules: the interstellar thread between star-forming regions and comets
• ExoMol molecular line lists - XXIII: spectra of PO and PS
• Phosphorus-bearing molecules in the Galactic Center
• The ExoMol Atlas of Molecular Opacities
• The chemistry of phosphorus-bearing molecules under energetic phenomena
• The first steps of Interstellar Phosphorus Chemistry
• On the origin of phosphorus nitride in star-forming regions
• Origin of the PN molecule in star-forming regions: the enlarged sample
• Detection of phosphorus-bearing molecules towards a Solar-type protostar
• First extragalactic detection of a phosphorus-bearing molecule with ALCHEMI: phosphorus nitride (PN)
• Chemical complexity of phosphorous bearing species in various regions of the Interstellar medium
• Reaction dynamics on amorphous solid water surfaces using interatomic machine learned potentials. Microscopic energy partition revealed from the P + H -> PH reaction
• Phosphorus Abundances in FGK Stars
• Nitrogen oxide in protostellar envelopes and shocks: the ASAI survey
• Quantifying the chemical desorption of H${}_2$S and PH${}_3$ from amorphous water ice surfaces
• A search for Cyanopolyynes in L1157-B1
• Experimental study of the removal of excited state phosphorus atoms by H${}_2$O and H${}_2$: implications for the formation of PO in stellar winds
• The L1157-B1 astrochemical laboratory: testing the origin of DCN
• New Detections of Phosphorus Molecules towards Solar-type Protostars
• Molecules in the CepE-mm jet: evidence for shock-driven photochemistry?
• Conformational isomerism of methyl formate: new detections of the higher-energy trans conformer and theoretical insights
• HCN/HNC chemistry in shocks: a study of L1157-B1 with ASAI
• First images of phosphorus molecules towards a proto-Solar analog
• New routes for PN destruction and formation in the ISM via neutral-neutral gas-phase reactions and an extended database for reactions involving phosphorus
• Collisional excitation of PO${}^{+}$ by $para$-H${}_2$
• Computational Estimation of the Binding Energies of POx and HPOx (x=2,3) Species
• The GUAPOS project. VI: the chemical inventory of shocked gas
• ACA observation and chemical modelling of phosphorus nitride (PN) towards the hot molecular cores G10.47+0.03 and G31.41+0.31
• First Detections of PN, PO, and PO+ toward a Shocked Low-mass Starless Core
• Molecules and Chemistry in Red Supergiants
• Formation of phosphorus monoxide (PO) in the interstellar medium: insights from quantum-chemical and kinetic calculations
• Chemistry of Dark Molecular Clouds