ORBi: de Val-Borro M. - Water production in comet 81P/Wild 2 as determined by Herschel/HIFI

Reference : Water production in comet 81P/Wild 2 as determined by Herschel/HIFI


	Document type :	Scientific journals : Article
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
	To cite this reference:	http://hdl.handle.net/2268/80849

Title :	Water production in comet 81P/Wild 2 as determined by Herschel/HIFI
Language :	English
Author, co-author :	de Val-Borro, M. [Max-Planck-Institut für Sonnensystemforschung, 37191 Katlenburg-Lindau, Germany]
	Hartogh, P. [Max-Planck-Institut für Sonnensystemforschung, 37191 Katlenburg-Lindau, Germany]
	Crovisier, J. [LESIA, Observatoire de Paris, 5 place Jules Janssen, 92195 Meudon, France]
	Bockelée-Morvan, D. [LESIA, Observatoire de Paris, 5 place Jules Janssen, 92195 Meudon, France]
	Biver, N. [LESIA, Observatoire de Paris, 5 place Jules Janssen, 92195 Meudon, France]
	Lis, D. C. [California Institute of Technology, Pasadena, CA 91125, USA]
	Moreno, R. [LESIA, Observatoire de Paris, 5 place Jules Janssen, 92195 Meudon, France]
	Jarchow, C. [Max-Planck-Institut für Sonnensystemforschung, 37191 Katlenburg-Lindau, Germany]
	Rengel, M. [Max-Planck-Institut für Sonnensystemforschung, 37191 Katlenburg-Lindau, Germany]
	Szutowicz, S. [Space Research Centre, Polish Academy of Sciences, Warsaw, Poland]
	Banaszkiewicz, M. [Space Research Centre, Polish Academy of Sciences, Warsaw, Poland]
	Bensch, F. [DLR, German Aerospace Centre, Bonn-Oberkassel, Germany]
	Błęcka, M. I. [Space Research Centre, Polish Academy of Sciences, Warsaw, Poland]
	Emprechtinger, M. [California Institute of Technology, Pasadena, CA 91125, USA]
	Encrenaz, T. [LESIA, Observatoire de Paris, 5 place Jules Janssen, 92195 Meudon, France]
	Jehin, Emmanuel [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image >]
	Küppers, M. [Rosetta Science Operations Centre, European Space Astronomy Centre, European Space Agency, Spain]
	Lara, L-M [Instituto de Astrofísica de Andalucía (CSIC), Spain]*
	Lellouch, E. [LESIA, Observatoire de Paris, 5 place Jules Janssen, 92195 Meudon, France]
	Swinyard, B. M. [STFC Rutherford Appleton Laboratory, Harwell Innovation Campus, Didcot, OX11 0QX, UK]
	Vandenbussche, B. [Instituut voor Sterrenkunde, Katholieke Universiteit Leuven, Belgium]
	Bergin, E. A. [Astronomy Department, University of Michigan, USA]
	Blake, G. A. [California Institute of Technology, Pasadena, CA 91125, USA]
	Blommaert, J A D L [Instituut voor Sterrenkunde, Katholieke Universiteit Leuven, Belgium]
	Cernicharo, J. [Laboratory of Molecular Astrophysics, CAB-CSIC, INTA, Spain]
	Decin, L. [Instituut voor Sterrenkunde, Katholieke Universiteit Leuven, Belgium ; Sterrenkundig Instituut Anton Pannekoek, University of Amsterdam, Science Park 904, 1098 Amsterdam, The Netherlands]
	Encrenaz, P. [LERMA, Observatoire de Paris, France]
	de Graauw, T. [Joint ALMA Observatory, Chile ; SRON Netherlands Institute for Space Research, Landleven 12, 9747 AD, Groningen, The Netherlands ; Leiden Observatory, University of Leiden, The Netherlands]
	Hutsemekers, Damien [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
	Kidger, M. [Science Centre, European Space Astronomy Centre, European Space Agency, Spain]
	Manfroid, Jean [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO) >]
	Medvedev, A. S. [Max-Planck-Institut für Sonnensystemforschung, 37191 Katlenburg-Lindau, Germany]
	Naylor, D. A. [Department of Physics and Astronomy, University of Lethbridge, Canada]
	Schieder, R. [KOSMA, I. Physik. Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany]
	Stam, D. [SRON Netherlands Institute for Space Research, Landleven 12, 9747 AD, Groningen, The Netherlands]
	Thomas [> >]
	Waelkens, C. [Instituut voor Sterrenkunde, Katholieke Universiteit Leuven, Belgium]
	Szczerba, R. [N. Copernicus Astronomical Center, Rabianska 8, 87-100, Torun, Poland]
	Saraceno, P. [Istituto Fisica Spazio Interplanetario-INAF, via Fosso del Cavaliere 100, 00133 Roma, Italy]
	di Giorgio, A. M. [Istituto Fisica Spazio Interplanetario-INAF, via Fosso del Cavaliere 100, 00133 Roma, Italy]
	Philipp, S. [Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany]
	Klein, T. [Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany]
	Ossenkopf, V. [KOSMA, I. Physik. Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany ; SRON Netherlands Institute for Space Research, Landleven 12, 9747 AD, Groningen, The Netherlands]
	Zaal, P. [SRON Netherlands Institute for Space Research, Landleven 12, 9747 AD, Groningen, The Netherlands]
	Shipman, R. [SRON Netherlands Institute for Space Research, Landleven 12, 9747 AD, Groningen, The Netherlands]
Publication date :	1-Oct-2010
Journal title :	Astronomy and Astrophysics
Volume :	521
Issue/season :	Letters
Pages :	50, pp. 1-5
Audience :	International
Keywords :	[en] comets: individual: 81P/Wild 2 ; molecular processes ; radiative transfer ; submillimeter: general
Abstract :	[en] The high spectral resolution and sensitivity of Herschel/HIFI allows for the detection of multiple rotational water lines and accurate determinations of water production rates in comets. In this Letter we present HIFI observations of the fundamental 1[SUB]10[/SUB]-1[SUB]01[/SUB] (557 GHz) ortho and 1[SUB]11[/SUB]-[SUB]00[/SUB] (1113 GHz) para rotational transitions of water in comet 81P/Wild 2 acquired in February 2010. We mapped the extent of the water line emission with five point scans. Line profiles are computed using excitation models which include excitation by collisions with electrons and neutrals and solar infrared radiation. We derive a mean water production rate of 1.0 × 10[SUP]28[/SUP] molecules s[SUP]-1[/SUP] at a heliocentric distance of 1.61 AU about 20 days before perihelion, in agreement with production rates measured from the ground using observations of the 18-cm OH lines. Furthermore, we constrain the electron density profile and gas kinetic temperature, and estimate the coma expansion velocity by fitting the water line shapes. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.Figure 5 (page 5) is only available in electronic form at <A href="http://www.aanda.org">http://www.aanda.org</A>
Target :	Researchers
Permalink :	http://hdl.handle.net/2268/80849
DOI :	10.1051/0004-6361/201015161
Other URL :	http://adsabs.harvard.edu/abs/2010A%26A...521L..50D
Commentary :	http://de.arxiv.org/abs/1007.0149

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