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Journal Articles Icarus Year : 1996

Impact Seismology: A Search for Primary Pressure Waves Following Impacts A and H

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Abstract

This paper reports part of the seismic observations performed after the impacts of Shoemaker–Levy 9 fragments A and H with the mid-IR camera TIMMI at the ESO 3.6-m telescope. Hodograms have been computed to search for the seismic signature of the primary waves crossing the planet within 2 hr following each impact. The hodogram analysis has been unable to detect any seismic signal. In order to put a limit on the kinetic energy of the fragments, the synthetic thermal signature of the primary wave has been calculated as a function of the incident energy, according to theoretical simulations, and taking into account observational conditions such as the point spread function. The non-detection implies that the kinetic energy of impacts A and H was less than 2 × 1021J, within the frame of the theoretical simulation of Lognonnéet al.(Lognonné, Ph., B. Mosser, and F. Dahlen 1994.Icarus110, 180–195.). The error bar is as large as one order of magnitude, according to other simulations. The seismic wave should have contributed to a non-negligible part of the heating of the region surrounding the impacts, but it is not yet possible to measure its contribution.
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Dates and versions

hal-03944147 , version 1 (17-01-2023)

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B. Mosser, P. Galdemard, P. Lagage, E. Pantin, M. Sauvage, et al.. Impact Seismology: A Search for Primary Pressure Waves Following Impacts A and H. Icarus, 1996, 121 (2), pp.331-340. ⟨10.1006/icar.1996.0091⟩. ⟨hal-03944147⟩
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