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Stardust Interstellar Preliminary Examination X: Impact speeds and directions of interstellar grains on the Stardust dust collector

Meteoritics and Planetary Science2014Vol. 49(9), pp. 1680–1697

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Veerle Sterken, Andrew J. Westphal, N. Altobelli, E. Grün, Jon K. Hillier, Frank Postberg, R. Srama, Carlton Allen, D. R. Anderson, Asna Ansari, S. Bajt, R. Bastien, Nabil Bassim, Hans A. Bechtel, J. Borg, Frank E. Brenker, J. C. Bridges, Donald E. Brownlee, M. J. Burchell, Manfred Burghammer, A. L. Butterworth, Hitesh Changela, Peter Cloetens, Andrew M. Davis, Ryan Doll, Christine Floss, G. J. Flynn, D. Frank, Z. Gainsforth, P. R. Heck, P. Höppe, Bruce S. Hudson, J. Huth, Brit Hvide, Anton Kearsley, A. J. King, Barry Lai, J. Leitner, Laurence Lemelle, Hugues Leroux, Ariel Leonard, Robert Lettieri, William Marchant, L. R. Nittler, R. C. Ogliore, Wei Ja Ong, Mark C. Price, Scott A. Sandford, J. A. Sans, Sylvia Schmitz, Tom Schoonjans, Geert Silversmit, Alexandre Simionovici, Vicente Armando Solé, T. Stephan, Julien Stodolna, R. M. Stroud, S. R. Sutton, M. Trieloff, Peter Tsou, A. Tsuchiyama, Tolek Tyliszczak, Bart Vekemans, László Vincze, Joshua Von Korff, Naomi Wordsworth, Daniel Zevin, M. E. Zolensky, > 30,000 Stardust@home dusters

Abstract

Abstract On the basis of an interstellar dust model compatible with Ulysses and Galileo observations, we calculate and predict the trajectories of interstellar dust ( ISD ) in the solar system and the distribution of the impact speeds, directions, and flux of ISD particles on the Stardust Interstellar Dust Collector during the two collection periods of the mission. We find that the expected impact velocities are generally low (<10 km s −1 ) for particles with the ratio of the solar radiation pressure force to the solar gravitational force β > 1, and that some of the particles will impact on the cometary side of the collector. If we assume astronomical silicates for particle material and a density of 2 g cm −3 , and use the Ulysses measurements and the ISD trajectory simulations, we conclude that the total number of (detectable) captured ISD particles may be on the order of 50. In companion papers in this volume, we report the discovery of three interstellar dust candidates in the Stardust aerogel tiles. The impact directions and speeds of these candidates are consistent with those calculated from our ISD propagation model, within the uncertainties of the model and of the observations.

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Abstract

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