de Val-Borro, M., Hartogh, P., Crovisier, J., Bockelee-Morvan, D., Biver, N., Lis, D. C., Moreno, R., Jarchow, C., Rengel, M., Szutowicz, S., Banaszkiewicz, M., Bensch, F., Blecka, M. I., Emprechtinger, M., Encrenaz, T., Jehin, E., Kueppers, M., Lara, L. -M., Lellouch, E., Swinyard, B. M., Vandenbussche, B., Bergin, E. A., Blake, G. A., Blommaert, J. A. D. L., Cernicharo, J., Decin, L., Encrenaz, P., de Graauw, T., Hutsemekers, D., Kidger, M., Manfroid, J., Medvedev, A. S., Naylor, D. A., Schieder, R., Stam, D., Thomas, N., Waelkens, C., Szczerba, R. ORCID: 0000-0003-2886-4460, Saraceno, P., Di Giorgio, A. M., Philipp, S., Klein, T., Ossenkopf, V., Zaal, P. and Shipman, R. (2010). Water production in comet 81P/Wild 2 as determined by Herschel/HIFI. Astron. Astrophys., 521. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 0004-6361

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Abstract

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(10)-1(01) (557 GHz) ortho and 1(11)-0(00) (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 x 10(28) molecules s(-1) 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.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
de Val-Borro, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hartogh, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Crovisier, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bockelee-Morvan, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Biver, N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lis, D. C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Moreno, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Jarchow, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rengel, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Szutowicz, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Banaszkiewicz, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bensch, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Blecka, M. I.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Emprechtinger, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Encrenaz, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Jehin, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kueppers, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lara, L. -M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lellouch, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Swinyard, B. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Vandenbussche, B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bergin, E. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Blake, G. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Blommaert, J. A. D. L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cernicharo, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Decin, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Encrenaz, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
de Graauw, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hutsemekers, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kidger, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Manfroid, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Medvedev, A. S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Naylor, D. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schieder, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Stam, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Thomas, N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Waelkens, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Szczerba, R.UNSPECIFIEDorcid.org/0000-0003-2886-4460UNSPECIFIED
Saraceno, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Di Giorgio, A. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Philipp, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Klein, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ossenkopf, V.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Zaal, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Shipman, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-494778
DOI: 10.1051/0004-6361/201015161
Journal or Publication Title: Astron. Astrophys.
Volume: 521
Date: 2010
Publisher: EDP SCIENCES S A
Place of Publication: LES ULIS CEDEX A
ISSN: 0004-6361
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
ODIN; SPACECRAFT; ASTRONOMY; SATELLITE; SURFACE; HIFI; H2OMultiple languages
Astronomy & AstrophysicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/49477

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