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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. and Blake, G. A. and Pontoppidan, K. M. (2010) 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. Astronomy and Astrophysics, 518 . Art. No. L128. ISSN 0004-6361.

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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 μm 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−1 K+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_⊙, 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.

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Blake, G. A.0000-0003-0787-1610
Pontoppidan, K. M.0000-0001-7552-1562
Additional Information:© 2010 ESO. Received 31 March 2010, Accepted 14 May 2010, Published online 16 July 2010. Herschel is an ESA space observatory with science instruments provided by the European-led Principal Investigator consortia and with important participation from NASA. Support for this work, part of the Herschel Open Time Key Project Program, was provided by NASA through an award issued by the Jet Propulsion Laboratory, California Institute of Technology. The authors would like to thank Bart VandenBussche and Alessandra Contursi for help with the data reduction, and David Ardila for his help in scheduling the observations prior to the ESAC SDP workshop.
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Subject Keywords:astrochemistry, circumstellar matter, stars: formation, stars: protostars, infrared: ISM, submillimeter: ISM
Record Number:CaltechAUTHORS:20101130-094751281
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Official Citation: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 T. A. van Kempen, J. D. Green, N. J. Evans, E. F. van Dishoeck, L. E. Kristensen, G. J. Herczeg, B. Merín, J.-E. Lee, J. K. Jørgensen, J. Bouwman, B. Acke, M. Adamkovics, J. C. Augereau, E. Bergin, G. A. Blake, J. M. Brown, J. S. Carr, J.-H. Chen, L. Cieza, C. Dominik, C. P. Dullemond, M. M. Dunham, A. Glassgold, M. Güdel, P. M. Harvey, Th. Henning, M. R. Hogerheijde, D. Jaffe, H. J. Kim, C. Knez, J. H. Lacy, S. Maret, G. Meeus, R. Meijerink, G. D. Mulders, L. Mundy, J. Najita, J. Olofsson, K. M. Pontoppidan, C. Salyk, B. Sturm, R. Visser, L. B. F. M. Waters, C. Waelkens and U. A. Yıldız A&A 518 L128 (2010) DOI: 10.1051/0004-6361/201014686
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:21056
Deposited By: Benjamin Perez
Deposited On:30 Nov 2010 19:14
Last Modified:03 Oct 2019 02:19

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