Agundez, M. and Cernicharo, J. and Pardo, J. R. and Guelin, M. and Phillips, T. (2008) Tentative detection of phosphine in IRC+10216. Astronomy and Astrophysics, 485 (3). L33-L36. ISSN 0004-6361 http://resolver.caltech.edu/CaltechAUTHORS:AGUaanda08
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Aims. The JK = 10−0_0 rotational transition of phosphine (PH_3) at 267 GHz has been tentatively identified with a TMB ~ 40 mK spectral line observed with the IRAM 30-m telescope in the C-star envelope IRC +10216. Methods. A radiative transfer model was used to fit the observed line profile. Results. The derived PH_3 abundance relative to H_2 is 6 × 10^−9, although it may have a large uncertainty due to the lack of knowledge about the spatial distribution of this species. If our identification is correct, it implies that PH3 has a similar abundance to what is reported for HCP in this source and that these two molecules (HCP and PH_3) together take up about 5% of phosphorus in IRC +10216. The abundance of PH_3, like that of other hydrides in this source, is not well explained by conventional gas-phase LTE and non-LTE chemical models, and may imply formation on grain surfaces.
|Additional Information:||© 2008. Received 14 May 2008 / Accepted 27 May 2008. We thank the IRAM staff, especially C. Thum, for their kindness during the 30-m observations. We also acknowledge funding support from Spanish MEC trough grants AYA2006-14876 and ESP2004-665, and from Spanish CAM under PRICIT project S-0505/ESP-0237 (ASTROCAM). M.A. also acknowledges grant AP2003-4619 from Spanish MEC.|
|Subject Keywords:||stars : individual : IRC+10216; stars : carbon; radio lines : stars; astrochemistry; line : identification; stars : AGB and post-AGB.|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||14 May 2009 15:52|
|Last Modified:||26 Dec 2012 10:49|
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