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The chemistry of C<sub>2</sub> and C<sub>3</sub> in the coma of Comet C/1995 O1 (Hale-Bopp) at heliocentric distances rh>2.9 AU

Helbert, Jörn und Rauer, Heike und Boice, Daniel C. und Huebner, Walter F. (2005) The chemistry of C<sub>2</sub> and C<sub>3</sub> in the coma of Comet C/1995 O1 (Hale-Bopp) at heliocentric distances rh>2.9 AU. Astronomy and Astrophysics, 3 (442), Seiten 1107-1120. DOI: 10.1051/0004-6361:20041571.

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Offizielle URL: http://www.edpsciences.org/articles/aa/pdf/2005/42/aa1571-04.pdf?access=ok

Kurzfassung

The extraordinary activity of comet C/1995 O1 (Hale-Bopp) made it possible to observe the emission bands of the radicals C<sub>2</sub> and C<sub>3</sub> in the optical wavelengths range at heliocentric distances larger than 3 AU. Based on these observations, we perform an analysis of the formation of C<sub>2</sub> and C<sub>3</sub> in a comet coma at large heliocentric distances.We present the most complete chemical reaction network used until today, computing the formation of C<sub>2</sub> and C<sub>3</sub> from C<sub>2</sub>H<sub>2</sub>, C<sub>2</sub>H<sub>6</sub>, and C<sub>3</sub>H<sub>4</sub> as their parent molecules. The required photodissociation rates of C<sub>3</sub>H<sub>2</sub> and C<sub>3</sub> had to be derived based on the observations. The spatial distributions of C<sub>2</sub> and C<sub>3</sub> calculated with the chemical model show good agreement with the observations over the whole range of heliocentric distances covered in this work. Based on the production rates for C<sub>2</sub>H<sub>2</sub>, C<sub>2</sub>H<sub>6</sub>, and C<sub>3</sub>H<sub>4</sub>, abundance ratios are obtained for heliocentric distances rh ≥ 3 AU. In comet Hale-Bopp, C<sub>2</sub>H<sub>2</sub> and C<sub>2</sub>H<sub>6</sub> were measured directly by infrared observations only at heliocentric distance rh ≤ 3 AU (Dello Russo et al. 2001). The model presented here greatly extends the heliocentric distance range over which hydrocarbons can be studied in the coma of comet Hale-Bopp. We discuss possible indications of these abundance ratios for the formation region of comet Hale-Bopp.

Dokumentart:Zeitschriftenbeitrag
Titel:The chemistry of C<sub>2</sub> and C<sub>3</sub> in the coma of Comet C/1995 O1 (Hale-Bopp) at heliocentric distances rh>2.9 AU
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Helbert, JörnNICHT SPEZIFIZIERT
Rauer, HeikeNICHT SPEZIFIZIERT
Boice, Daniel C.Southwest Research Institute, San Antonio, USA
Huebner, Walter F.Southwest Research Institute, San Antonio, USA
Datum:2005
Erschienen in:Astronomy and Astrophysics
Referierte Publikation:Ja
In ISI Web of Science:Ja
Band:3
DOI :10.1051/0004-6361:20041571
Seitenbereich:Seiten 1107-1120
Status:veröffentlicht
Stichwörter:comets: general – comets: individual: C/1995 O1 (Hale-Bopp) – planets and satellites: formation – interplanetary medium
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EW - Erforschung des Weltraums
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EW - Erforschung des Weltraums
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Asteroiden und Kometen (alt)
Standort: Berlin-Adlershof
Institute & Einrichtungen:Institut für Planetenforschung > Planetenphysik
Hinterlegt von: Barbara Stracke
Hinterlegt am:06 Dez 2005
Letzte Änderung:14 Jan 2010 20:12

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