Chemical Complexity of Phosphorous-bearing Species in Various Regions of the Interstellar Medium
Milan Sil,Satyam Srivastav,Bratati Bhat,Suman Kumar Mondal,Prasanta Gorai,Prasanta Gorai,Rana Ghosh,Takashi Shimonishi,Sandip K. Chakrabarti,Bhalamurugan Sivaraman,Amit Pathak,Naoki Nakatani,Naoki Nakatani,Kenji Furuya,Ankan Das +14 more
TLDR
In this article, the authors carried 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.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 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 .read more
Citations
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Quantifying the Chemical Desorption of H<sub>2</sub>S and PH<sub>3</sub> from Amorphous Water-ice Surfaces
TL;DR: In this paper , the authors constrain the desorption probability of H 2 S and PH 3 per reaction event on porous amorphous solid water (ASW) by numerically simulating previous laboratory experiments.
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Is There Any Linkage between Interstellar Aldehyde and Alcohol
Suman Kumar Mondal,Prasanta Gorai,Milan Sil,Rana Ghosh,Emmanuel E. Etim,Sandip K. Chakrabarti,Takashi Shimonishi,Naoki Nakatani,Kenji Furuya,Jonathan C. Tan,Ankan Das +10 more
TL;DR: In this article, an observational study and astrochemical modeling are coupled together to illustrate the connection between aldehydes and their corresponding alcohols in the ALMA Cycle 4 data of a hot molecular core, G10.47+0.03.
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Astrochemical model to study the abundances of branched carbon-chain molecules in a hot molecular core with realistic binding energies
TL;DR: In this article , the binding energy of straight-chain and branched-chain alkyl cyanides was estimated using quantum chemical calculations, considering water as a substrate and water is the principal constituent of the interstellar ice.
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Radiative transfer modeling of the observed line profiles in G31.41+0.31
TL;DR: In this paper , exclusive radiative transfer modelings have been implemented to generate synthetic spectra of some key species (H13 CO+, HCN, SiO, NH3, CH3 CN, CH 3 O, CH O, NH 3 NH 3 O and CH 3 NCO) and extract the physical features to infer the excitation conditions of the surroundings where they observed, which suggest that an infalling gas could explain the observed line profiles of all the species mentioned above except SiO.
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Experimental study of the removal of excited state phosphorus atoms by H2O and H2: implications for the formation of PO in stellar winds
TL;DR: In this article , a comprehensive phosphorus chemistry network is developed using a combination of electronic structure theory calculations and a Master Equation treatment of reactions taking place over complex potential energy surfaces, and the resulting model shows that collisional excitation of ground-state P(4S) to P(2D), followed by reaction with H2O, is a significant pathway for producing PO (in addition to the reaction between P4S and OH).
References
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