Chemical Complexity of Phosphorous-bearing Species in Various Regions of the Interstellar Medium
Artikel i vetenskaplig tidskrift, 2021

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 more abundant in diffuse clouds and PDRs than in the hot core/corino region, PO/PN reflects <1 in diffuse clouds, MUCH LESS-THAN1 in PDRs, and >1 in the late warm-up evolutionary stage of the hot core/corino regions. During the end of the post-warm-up stage, 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 similar to 1000-1100 cm(-1). We also find that the presence of CO2 can strongly influence the intensity of the stretching modes around similar to 2400 cm(-1) of PH3.


Milan Sil

Indian Centre for Space Physics

Satyam Srivastav

Banaras Hindu University

Bratati Bhat

Indian Centre for Space Physics

Suman Kumar Mondal

Indian Centre for Space Physics

Prasanta Gorai

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik

Indian Centre for Space Physics

Rana Ghosh

Indian Centre for Space Physics

Takashi Shimonishi

Niigata University

Sandip K. Chakrabarti

Indian Centre for Space Physics

Bhalamurugan Sivaraman

Physical Research Laboratory

Amit Pathak

Banaras Hindu University

Naoki Nakatani

Tokyo Metropolitan University

Hokkaido University

Kenji Furuya

National Astronomical Observatory of Japan

University of Tsukuba

Ankan Das

Indian Centre for Space Physics

Astronomical Journal

0004-6256 (ISSN) 1538-3881 (eISSN)

Vol. 162 3 119


Meteorologi och atmosfärforskning

Astronomi, astrofysik och kosmologi




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