Rotating dust particles in the coma of comet 67P/Churyumov-Gerasimenko

Fulle, M.; Ivanovski, S. L.; Bertini, I.; Gutierrez, P.; Lara, L.; Sierks, H.; Zakharov, V.; Della Corte, V.; Rotundi, A.; Barbieri, C.; Lamy, P. L.; Rodrigo, R.; Koschny, D.; Rickman, H.; Keller, H. U.; Agarwal, J.; A'Hearn, M. F.; Barucci, M. A.; Bertaux, J. L.; Bodewits, D.; ... (2015). Rotating dust particles in the coma of comet 67P/Churyumov-Gerasimenko. Astronomy and astrophysics, 583(A14), A14. EDP Sciences 10.1051/0004-6361/201526158

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Context. During September and October 2014, the OSIRIS cameras onboard the ESA Rosetta mission detected millions of single particles. Many of these dust particles appear as long tracks (due to both the dust proper motion and the spacecraft motion during the exposure time) with a clear brightness periodicity. Aims. We interpret the observed periodic features as a rotational and translational motion of aspherical dust grains. Methods. By counting the peaks of each track, we obtained statistics of a rotation frequency. We compared these results with the rotational frequency predicted by a model of aspherical dust grain dynamics in a model gas flow. By testing many possible sets of physical conditions and grain characteristics, we constrained the rotational properties of dust grains. Results. We analyzed on the motion of rotating aspherical dust grains with different cross sections in flow conditions corresponding to the coma of 67P/Churyumov-Gerasimenko qualitatively and quantitatively. Based on the OSIRIS observations, we constrain the possible physical parameters of the grains.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences
08 Faculty of Science > Physics Institute

UniBE Contributor:

Thomas, Nicolas

Subjects:

500 Science > 520 Astronomy
500 Science > 530 Physics

ISSN:

0004-6361

Publisher:

EDP Sciences

Language:

English

Submitter:

Katharina Weyeneth-Moser

Date Deposited:

17 Jun 2016 13:58

Last Modified:

26 Jun 2016 02:16

Publisher DOI:

10.1051/0004-6361/201526158

Web of Science ID:

000365072200062

BORIS DOI:

10.7892/boris.81961

URI:

https://boris.unibe.ch/id/eprint/81961

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