Dust, Ice, and Gas In Time (DIGIT) Herschel program first results: A full PACS-SED scan of the gas line emission in protostar DK Chamaeleontis
- van Kempen, T.A.
- Green, J.D.
- Evans II, N.J.
- van Dishoeck, E.F.
- Kristensen, L.E.
- Herczeg, G.J.
- Merín, B.
- Lee, J.-E.
- Jørgensen, 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.
- Güdel, M.
- Harvey, P.M.
- Henning, T.
- 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, U.A.
DOIAbstract
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 ...
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