Dust, Ice, and Gas In Time (DIGIT) <i>Herschel</i> program first results A full PACS-SED scan of the gas line emission in protostar DK Chamaeleontis

Date

2010-07-01

Author

van Kempen, T. A.
Green, J. D.
Evans, N. J.
van Dishoeck, E. F.
Kristensen, L. E.
Herczeg, G. J.
Merin, B.
Lee, J. -E.
Jorgensen, J. K.
Bouwman, J.
Acke, B.
Adamkovics, M.
Augereau, J. C.
Bergin, E.
Blake, G. A.
Brown, J. M.
Carr, J. S.
Chen, J. -H.
Cieza, L.
Dominik, C.
Dullemond, C. P.
Dunham, M. M.
Glassgold, A.
Guedel, M.
Harvey, P. M.
Henning, Th.
Hogerheijde, M. R.
Jaffe, D.
Kim, H. J.
Knez, C.
Lacy, J. H.
Maret, S.
Meeus, G.
Meijerink, R.
Mulders, G. D.
Mundy, L.
Najita, J.
Olofsson, J.
Pontoppidan, K. M.
Salyk, C.
Sturm, B.
Visser, R.
Waters, L. B. F. M.
Waelkens, C.
Yıldız, Umut

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Aims. We aim to study the composition and energetics of the circumstellar material of DK Cha, an intermediate-mass star in transition from an embedded configuration to a star plus disk stage, during this pivotal stage of its evolution. Methods. Using the range scan mode of PACS on the Herschel Space Observatory, we obtained a spectrum of DK Cha from 55 to 210 mu m as part of the DIGIT key program. Results. Almost 50 molecular and atomic lines were detected, many more than the 7 lines detected in ISO-LWS. Nearly the entire ladder of CO from J = 14-13 to 38-37 (E-u/k = 4080 K), water from levels as excited as J(K-1K+1) = 7(07) (E-u/k = 843 K), and OH lines up to E-u/k = 290 K were detected. Conclusions. The continuum emission in our PACS SED scan matches the flux expected by a model consisting of a star, a surrounding disk of 0.03 M-circle dot, and an envelope of a similar mass, supporting the suggestion that the object is emerging from its main accretion stage. Molecular, atomic, and ionic emission lines in the far-infrared reveal the outflow's influence on the envelope. The inferred hot gas may be photon-heated, but some emission may be caused by C-shocks in the walls of the outflow cavity.

URI

https://hdl.handle.net/11511/115891

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Department of Physics, Article