Tentative detection of phosphine in IRC +10216

  title={Tentative detection of phosphine in IRC +10216},
  author={Marcelino Ag'undez and Jos{\'e} Cernicharo and Juan R. Pardo and Michel Gu'elin and Thomas G. Phillips},
  journal={Astronomy and Astrophysics},
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… 

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