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Energetic processes revealed by spectrally resolved high-JCO lines in low-mass star-forming regions with Herschel-HIFI

U.A. Yıldız, E.F. van Dishoeck, L.E. Kristensen, R. Visser, G. Herczeg, T.A. van Kempen, J.K. Jørgensen, M.R. Hogerheijde, the WISH Team
2011 EAS Publications Series  
Herschel-HIFI observations of high-J lines (up to J_u=10) of 12CO, 13CO and C18O are presented toward three deeply embedded low-mass protostars in NGC1333. The observations show several energetic components including shocked and quiescent gas. Radiative transfer models are used to quantify the C18O envelope abundance which require a jump in the abundance at an evaporation temperature, T_ev ~25 K, providing new direct evidence of a CO ice evaporation zone around protostars. The abundance in the
more » ... e abundance in the outermost part of the envelope, X_0, is within the canonical value of 2x10^-4; however the inner abundance, X_in, is found around a factor of 3-5 lower than X_0.
doi:10.1051/eas/1152063 fatcat:qydbihl4rvcfbcvvn4uus6gtra