The Triggered Outburst after the Deep Impact Collision with Comet Tempel 1 and the Composition of the Comet

Details The Triggered Outburst after the Deep Impact Collision with Comet Tempel 1 and the Composition of the Comet The Triggered Outburst after the Deep Impact Collision with Comet Tempel 1 and the Composition of the Comet

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.2835i&link_type=abstract

American Astronomical Society, DPS meeting #42, #28.35; Bulletin of the American Astronomical Society, Vol. 42, p.966

Astronomy and Astrophysics

Astronomy

Scientific paper

Our studies of ejection of material from Comet Tempel 1 testify in favor of that there was a triggered outburst after the collision of the DI impactor with the comet [1-2]. A considerable outburst began at about 10 s after DI impact. The beginning of the increase of the outburst could be caused by excavation of a large cavity that contained dust and gas under pressure. The upper edge of the cavity excavated at time of ejection te 10 s could be located a few meters under the surface of Comet Tempel 1. The outburst decreased at 60 s after the impact. Besides the `fast’ outburst caused by ejection from the cavities, there was a `slow’ outburst ejection, which was similar to the ejection from a `fresh’ surface of a comet and could last 30-60 min or more. Analysis of observations of the DI cloud and of outbursts from different comets testifies in favor of that there can be large cavities with material under gas pressure below a considerable fraction of a comet's surface. Internal gas pressure (e.g. due to crystallization of amorphous ice) and the material in the cavities can produce natural and triggered outbursts and can cause splitting of comets. Analysis of DI observations that used different approaches showed that at 1

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