2022ApJ...940L..11K -
Astrophys. J., 940, L11 (2022/November-3)
Laboratory and Astronomical Detection of the SiP Radical (X2Πi): More Circumstellar Phosphorus.
KOELEMAY L.A., BURTON M.A., SINGH A.P., SHERIDAN P.M., BERNAL J.J. and ZIURYS L.M.
Abstract (from CDS):
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 SiH4 in 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 ∼300 R*, and an abundance, relative to H2, of f ∼ 2 × 10–9. From additional modeling, abundances of 7 × 10–9 and 9 × 10–10 were determined for CP and PN, respectively, both located in shells at 550-650 R*. 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.
Abstract Copyright:
© 2022. The Author(s). Published by the American Astronomical Society.
Journal keyword(s):
Astrochemistry - Circumstellar envelopes - Molecular spectroscopy - Evolved stars - Chemical abundances - Interstellar molecules - Asymptotic giant branch stars
Simbad objects:
9
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