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The impact and rotational light curves of Comet 9P/Tempel 1 |
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| Authors: | Jean Manfroid Damien Hutsemékers Anita L Cochran William M Jackson Rita Schulz |
| Institution: | a Institut d'Astrophysique et de Géophysique, Sart-Tilman, B-4000 Liège, Belgium b European Southern Observatory, Casilla 19001, Santiago, Chile c Department of Astronomy and McDonald Observatory, University of Texas at Austin, C-1400, Austin, TX, USA d Department of Chemistry, University of California, 1 Shields Avenue, Davis, CA 95616, USA e Institute for Astronomy, University of Hawaii at Manoa, 2680 Woodlawn Drive, Honolulu, HI, USA f ESA/RSSD, ESTEC, P.O. Box 299, NL-2200 AG Noordwijk, The Netherlands g Observatoire de Besançon, F25010 Besançon Cedex, France |
| Abstract: | UVES and HIRES high-resolution spectra of Comet 9P/Tempel 1 are used to investigate the impact and rotational light curves of various species with a view toward building a simple model of the distribution and activity of the sources. The emission by OH, NH, CN, C3, CH, C2, NH2, and OI, are analyzed, as well as the light scattered by the dust. It is found that a simple model reproduces fairly well the impact light curves of all species combining the production of the observed molecules and the expansion of the material throughout the slit. The impact light curves are consistent with velocities of 400-600 m/s. Their modeling requires a three-step dissociation sequence “Grand-Parent → Parent → Daughter” to produce the observed molecules. The rotational light curve for each species is explained in terms of a single model with three sources. The dust component can however not easily be explained that way. |
| Keywords: | Comet Tempel-1 |
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