ACA observation and chemical modelling of phosphorus nitride (PN) towards the hot molecular cores G10.47+0.03 and G31.41+0.31

Abstract

Phosphorus (P) is one of the important elements for the formation of life and plays a crucial role in several biochemical processes. Recent spectral line surveys have confirmed the existence of P-bearing molecules, especially PN and PO, in the star-formation regions, but their formation mechanisms are poorly understood. The P-bearing molecule phosphorus nitride (PN) is detected in several star-forming regions, but this molecule has been poorly studied at high gas densities ($\ge$10${}^6$ cm${}^{-3}$) hot molecular cores. In this article, we present the detection of the rotational emission line of PN with transition J = 3$-$2 towards the hot molecular cores G10.47+0.03 and G31.41+0.31, using the Atacama Compact Array (ACA). The estimated column densities of PN for G10.47+0.03 and G31.41+0.31 using the local thermodynamic equilibrium (LTE) model are (3.60$\pm$0.2)$\times$10${}^{13}$ cm${}^{-2}$ and (9.10$\pm$0.1)$\times$10${}^{12}$ cm${}^{-2}$ with an excitation temperature of 150$\pm$25 K. The fractional abundance of PN relative to H${}_2$ is 2.76$\times$10${}^{-10}$ for G10.47+0.03 and 5.68$\times$10${}^{-11}$ for G31.41+0.031. We compute the two-phase warm-up chemical model of PN to understand the chemical evolution in the environment of hot molecular cores. After chemical modelling, we claim that PN is created in the gas phase via the neutral-neutral reaction between PO and N in the warm-up stage. Similarly, PN is destroyed via the ion-neutral reaction between H${}_3$O${}^{+}$ and PN.

Published in Journal of Astrophysics and Astronomy

References in corpus (13)

• Polycylcic Aromatic Hydrocarbons (PAH's) in dense cloud chemistry
• UCLCHEM: A Gas-Grain Chemical Code
• Confirmation of circumstellar phosphine
• 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
• Detection of Neutral Phosphorus in the Near Ultraviolet Spectra of Late-Type Stars
• 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
• Identification of interstellar amino acetonitrile in the hot molecular core G10.47+0.03: Possible glycine survey candidate for the future
• Identification of the simplest sugar-like molecule glycolaldehyde towards the hot molecular core G358.93-0.03 MM1
• Detection of complex nitrogen-bearing molecule ethyl cyanide towards the hot molecular core G10.47+0.03

Cited by in corpus (3)

• First Identification and Chemical Modeling of New Thiol ($-$SH) Bearing Molecule in the Interstellar Medium: Dithioformic Acid
• Detection and prebiotic chemistry of possible glycine precursor molecule methylenimine towards the hot molecular core G10.47+0.03
• Organic Acid Chemistry in ISM: Detection of Formic Acid and its Prebiotic Chemistry in Hot Core G358.93$-$0.03 MM1