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First results of the Herschel key program “Dust, Ice and Gas In Time” (DIGIT): Dust and gas spectroscopy of HD100546

Sturm, B. and Blake, G. A. and Pontoppidan, K. M. (2010) First results of the Herschel key program “Dust, Ice and Gas In Time” (DIGIT): Dust and gas spectroscopy of HD100546. Astronomy and Astrophysics (518). Art. No. L129. ISSN 0004-6361.

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Context. We present far-infrared spectroscopic observations, taken with the Photodetector Array Camera and Spectrometer (PACS) on the Herschel Space Observatory, of the protoplanetary disk around the pre-main-sequence star HD100546. These observations are the first within the DIGIT Herschel key program, which aims to follow the evolution of dust, ice, and gas from young stellar objects still embedded in their parental molecular cloud core, through the final pre-main-sequence phases when the circumstellar disks are dissipated. Aims. Our aim is to improve the constraints on temperature and chemical composition of the crystalline olivines in the disk of HD100546 and to give an inventory of the gas lines present in its far-infrared spectrum. Methods. The 69 μm feature is analyzed in terms of position and shape to derive the dust temperature and composition. Furthermore, we detected 32 emission lines from five gaseous species and measured their line fluxes. Results. The 69 μm emission comes either from dust grains with ~70 K at radii larger than 50 AU, as suggested by blackbody fitting, or it arises from ~200K dust at ~13 AU, close to the midplane, as supported by radiative transfer models. We also conclude that the forsterite crystals have few defects and contain at most a few percent iron by mass. Forbidden line emission from [C_(II)] at 157 μm and [O_I] at 63 and 145 μm, most likely due to photodissociation by stellar photons, is detected. Furthermore, five H_2O and several OH lines are detected. We also found high-J rotational transition lines of CO, with rotational temperatures of ~300K for the transitions up to J = 22−21 and T ~ 800 K for higher transitions.

Item Type:Article
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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 28 April 2010, Published online 16 July 2010. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA. Support for this work, part of the Herschel open time key program, was provided by NASA through an award issued by the Jet Propulsion Laboratory, California Institute of Technology. G. Meeus is partly supported by Spanish grant AYA 2008-01727. The authors thank the referee C. Grady for helpful comments that improved the paper.
Funding AgencyGrant Number
Ministerio de Ciencia e Innovación (MCINN)AYA 2008-01727
Subject Keywords:stars: individual: HD100546, infrared: general, stars: pre-main sequence, techniques: spectroscopic
Issue or Number:518
Record Number:CaltechAUTHORS:20101203-102414346
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Official Citation:First results of the Herschel key program “Dust, Ice and Gas In Time” (DIGIT): Dust and gas spectroscopy of HD 100546 B. Sturm, J. Bouwman, Th. Henning, N. J. Evans, B. Acke, G. D. Mulders, L. B. F. M. Waters, E. F. van Dishoeck, G. Meeus, J. D. Green, J. C. Augereau, J. Olofsson, C. Salyk, J. Najita, G. J. Herczeg, T. A. van Kempen, L. E. Kristensen, C. Dominik, J. S. Carr, C. Waelkens, E. Bergin, G. A. Blake, J. M. Brown, J.-H. Chen, L. Cieza, M. M. Dunham, A. Glassgold, M. Güdel, P. M. Harvey, M. R. Hogerheijde, D. Jaffe, J. K. Jørgensen, H. J. Kim, C. Knez, J. H. Lacy, J.-E. Lee, S. Maret, R. Meijerink, B. Merín, L. Mundy, K. M. Pontoppidan, R. Visser and U. A. Yıldız A&A 518 L129 (2010) DOI: 10.1051/0004-6361/201014674
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:21149
Deposited By: Benjamin Perez
Deposited On:03 Dec 2010 19:27
Last Modified:03 Oct 2019 02:20

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