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Broad- and narrowband visible imaging of comet 9P/Tempel 1 at ESO around the time of the Deep Impact event

Boehnhardt, H. und Pompei, E. und Tozzi, G. und Hainaut, O. und Ageorges, N. und Bagnulo, S. und Barrera, L. und Bonev, T. und Käufl, H. und Kerber, F. und LoCurto, G. und Marco, O. und Pantin, E. und Rauer, H. und Saviane, I. und Selman, F. und Sterken, C. und Weiler, M. (2007) Broad- and narrowband visible imaging of comet 9P/Tempel 1 at ESO around the time of the Deep Impact event. Astronomy and Astrophysics, 470 (3), Seiten 1175-1184. doi: 10.1051/0004-6361:20066577. ISSN 0004-6361.

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Kurzfassung

Context.On 4 July 2005 at 05:52UT the impactor of NASA's DeepImpact (DI) mission exploded at comet 9P/Tempel 1. The ejecta material of the impact expanded into the coma that is produced by normal cometary activity. The La Silla and Paranal sites of the European Southern Observatory ESO in Chile participated in the world-wide campaign to observe this event. Aims.The gas and dust content of the cometary coma is observed around the time of the DI event to identify signatures of the impact, like changes in the gas production (CN, C<sub>3</sub>, C<sub>2</sub>, NH<sub>2</sub> and Na) and in the dust properties. The study also describes the normal activity pattern in the coma and the expanding ejecta cloud. Methods.The gas production rates and the dust reddening slope are measured in images obtained through narrowband cometary filters. The ejecta cloud and the features of normal cometary activity, as imaged in narrow- and broadband filter images, are studied with respect to geometry, intensity, and persistence. Results.The production of CN, C<sub>3</sub>, and C<sub>2</sub> gas by the nucleus is at similar level on 3 July and 9+10 July 2005. The mixing ratios of these gases are in the range of those for "typical" comets. NH<sub>2</sub> and Na gas are not detected above the dust continuum flux in the coma. The reddening slope of the dust continuum changes from a value of 9%/100 nm, constant throughout 20 000 km distance around the nucleus, on 3 July to about 19-20%/100 nm on 9+10 July 2005. An increase of the slope with radial distance is found. Both changes might be due to the presence of dust from the ejecta cloud. The dust coma of the comet showed a porcupine pattern of 9 coma jets before impact which remained intact after impact. It can be interpreted as being due to embedded fan structures produced by at least 4 active regions on the rotating nucleus. The ejecta cloud contains dust grains of likely absorbing material and possibly dielectric admixtures with solar radiation pressure factors beta of 0.2-1.9 and ejection velocities of 160-370 m s<sup>-1</sup>. The ejecta cloud is optically thin 21 h after impact and shows a higher surface brightness and redder color in the sunward sector compared to the tailward side.

elib-URL des Eintrags:https://elib.dlr.de/48784/
Dokumentart:Zeitschriftenbeitrag
Titel:Broad- and narrowband visible imaging of comet 9P/Tempel 1 at ESO around the time of the Deep Impact event
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iD
Boehnhardt, H.Max-Planck Institute for Solar System Research,
Pompei, E.European Southern Observatory
Tozzi, G.INAF Arcetri Observatory
Hainaut, O.European Southern Observatory
Ageorges, N.European Southern Observatory
Bagnulo, S.European Southern Observatory
Barrera, L.Universidad Metropolitana de Ciencias de la Educacion
Bonev, T.Bulgarian Academy of Sciences
Käufl, H.European Southern Observatory
Kerber, F.European Southern Observatory
LoCurto, G.European Southern Observatory
Marco, O.European Southern Observatory
Pantin, E.Commissariat Energie Atomique
Rauer, H.
Saviane, I.European Southern Observatory
Selman, F.European Southern Observatory
Sterken, C.Vrije Universitet Brussel Pleinlaan
Weiler, M.
Datum:2007
Erschienen in:Astronomy and Astrophysics
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Ja
Band:470
DOI:10.1051/0004-6361:20066577
Seitenbereich:Seiten 1175-1184
ISSN:0004-6361
Status:veröffentlicht
Stichwörter:Tempel 1, Deep Impact, comets
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 Extrasolare Planeten (alt)
Standort: Berlin-Adlershof
Institute & Einrichtungen:Institut für Planetenforschung > Extrasolare Planeten und Atmosphären
Hinterlegt von: Paris, Philip
Hinterlegt am:23 Jul 2007
Letzte Änderung:27 Apr 2009 13:50

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