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Title: Laboratory and Astronomical Detection of the SiP Radical (X 2 Π i ): More Circumstellar Phosphorus
Abstract The millimeter-wave spectrum of the SiP radical (X2Πi) has been measured in the laboratory for the first time using direct-absorption methods. SiP was created by the reaction of phosphorus vapor and SiH4in argon in an AC discharge. Fifteen rotational transitions (J+ 1 ←J) were measured for SiP in the Ω = 3/2 ladder in the frequency range 151–533 GHz, and rotational, lambda doubling, and phosphorus hyperfine constants determined. Based on the laboratory measurements, SiP was detected in the circumstellar shell of IRC+10216, using the Submillimeter Telescope and the 12 m antenna of the Arizona Radio Observatory at 1 mm and 2 mm, respectively. Eight transitions of SiP were searched: four were completely obscured by stronger features, two were uncontaminated (J= 13.5 → 12.5 and 16.5 → 15.5), and two were partially blended with other lines (J= 8.5 → 7.5 and 17.5 → 16.5). The SiP line profiles were broader than expected for IRC+10216, consistent with the hyperfine splitting. From non-LTE radiative transfer modeling, SiP was found to have a shell distribution with a radius ∼300R*, and an abundance, relative to H2, off∼ 2 × 10−9. From additional modeling, abundances of 7 × 10−9and 9 × 10−10were determined for CP and PN, respectively, both located in shells at 550–650R*. SiP may be formed from grain destruction, which liberates both phosphorus and silicon into the gas phase, and then is channeled into other P-bearing molecules such as PN and CP.  more » « less
Award ID(s):
1907910
PAR ID:
10484978
Author(s) / Creator(s):
; ; ; ; ;
Publisher / Repository:
IOP
Date Published:
Journal Name:
The Astrophysical Journal Letters
Volume:
940
Issue:
1
ISSN:
2041-8205
Page Range / eLocation ID:
L11
Format(s):
Medium: X
Sponsoring Org:
National Science Foundation
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