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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 559511.0, MPI für Astronomie / Publikationen_mpia
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
Authors:van Kempen, T. A.; Green, J. D.; Evans, 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, 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.; Yíldíz, U. A.
Date of Publication (YYYY-MM-DD):2010
Title of Journal:Astronomy and Astrophysics
Journal Abbrev.:Astronomy and Astrophysics
Start Page:id.L128
Review Status:Peer-review
Audience:Not Specified
Abstract / Description:<BR /> 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. <BR /> Methods: Using the range scan mode of PACS on the Herschel Space Observatory, we obtained a spectrum of DK Cha from 55 to 210 μm as part of the DIGIT key program. <BR /> 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 (Eu/k = 4080 K), water from levels as excited as JK_{-1K+1} = 707 (Eu/k = 843 K), and OH lines up to Eu/k = 290 K were detected. <BR /> 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_ȯ, 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. Herschel is an ESA space observatory with science instruments provided by the European-led Principal Investigator consortia and with important participation from NASA.
Free Keywords:astrochemistry; circumstellar matter; stars: formation; stars: protostars; infrared: ISM; submillimeter: ISM
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2010A%26A...518L.128... [ID No:1]
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