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

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

doi:10.1051/0004-6361/201014686

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

van Kempen T. A., Green J. D., Evans N. J., van Dishoeck E. F., Kristensen L. E., Herczeg G. J., ...Daha Fazla

ASTRONOMY & ASTROPHYSICS, cilt.518, 2010 (SCI-Expanded, Scopus)

Yayın Türü: Makale / Tam Makale
Cilt numarası: 518
Basım Tarihi: 2010
Doi Numarası: 10.1051/0004-6361/201014686
Dergi Adı: ASTRONOMY & ASTROPHYSICS
Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
Orta Doğu Teknik Üniversitesi Adresli: Hayır

Özet

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.