Chemical complexity of phosphorous bearing species in various regions of the Interstellar medium

Abstract

Phosphorus related species are not known to be as omnipresent in space as hydrogen, carbon, nitrogen, oxygen, and sulfur-bearing species. Astronomers spotted very few P-bearing molecules in the interstellar medium and circumstellar envelopes. Limited discovery of the P-bearing species imposes severe constraints in modeling the P-chemistry. In this paper, we carry out extensive chemical models to follow the fate of P-bearing species in diffuse clouds, photon-dominated or photodissociation regions (PDRs), and hot cores/corinos. We notice a curious correlation between the abundances of PO and PN and atomic nitrogen. Since N atoms are comparatively abundant in diffuse clouds and PDRs than in the hot core/corino region, PO/PN reflects < 1 in diffuse clouds, << 1 in PDRs, and > 1 in the late warm-up evolutionary phase of the hot core/corino regions. During the end of the post-warm-up phase, we obtain PO/PN > 1 for hot core and < 1 for its low mass analog. We employ a radiative transfer model to investigate the transitions of some of the P-bearing species in diffuse cloud and hot core regions and estimate the line profiles. Our study estimates the required integration time to observe these transitions with ground-based and space-based telescopes. We also carry out quantum chemical computation of the infrared features of PH3 along with various impurities. We notice that SO2 overlaps with the PH3 bending-scissoring modes around ~ (1000 - 1100) cm-1. We also find that the presence of CO2 can strongly influence the intensity of the stretching modes around ~ 2400 cm-1 of PH3 .

44 pages, 28 figures, Accepted for the publication in The Astronomical Journal

References in corpus (19)

• A Unified Representation of Gas-Phase Element Depletions in the Interstellar Medium
• The Critical Density and the Effective Excitation Density of Commonly Observed Molecular Dense Gas Tracers
• The 2014 KIDA network for interstellar chemistry
• Polycylcic Aromatic Hydrocarbons (PAH's) in dense cloud chemistry
• The Spatial Distribution of Complex Organic Molecules in the L1544 Pre-stellar Core
• Confirmation of circumstellar phosphine
• Phosphine as a Biosignature Gas in Exoplanet Atmospheres
• ALMA and ROSINA detections of phosphorus-bearing molecules: the interstellar thread between star-forming regions and comets
• Phosphorus-bearing molecules in solar-type star forming regions: First PO detection
• Phosphorus-bearing molecules in the Galactic Center
• Tentative detection of phosphine in IRC+10216
• Re-analysis of the 267-GHz ALMA observations of Venus: No statistically significant detection of phosphine
• Search for Interstellar monohydric Thiols
• The first steps of Interstellar Phosphorus Chemistry
• A New and Simple Approach to Determine the Abundance of Hydrogen Molecules on Interstellar Ice Mantles
• Detection of phosphorus-bearing molecules towards a Solar-type protostar
• The Possibility of Forming Propargyl Alcohol in the Interstellar Medium
• Effect of binding energies on the encounter desorption
• A Systematic Study on the Absorption Features of Interstellar Ices in Presence of Impurities

Cited by in corpus (1)

• Radiative transfer modeling of the observed line profiles in G31.41+0.31