A large dust/ice ratio in the nucleus of comet 9P/Tempel 1

Michael Küppers, Ivano Bertini, Sonia Fornasier, Pedro J. Gutierrez, Stubbe F. Hviid, Laurent Jorda, Horst Uwe Keller, Jörg Knollenberg, Detlef Koschny, Rainer Kramm, Luisa Maria Lara, Holger Sierks, Nicolas Thomas, Cesare Barbieri, Philippe Lamy, Hans Rickman, Rafael Rodrigo, M. F. A'Hearn, F. Angrilli, M. E. BaileyP. Barthol, M. A. Barucci, J. L. Bertaux, J. A. Burns, G. Cremonese, W. Curdt, M. De Cecco, S. Debei, M. Fulle, F. Gliem, W. H. Ip, E. Kührt, A. Llebaria, J. J. Lopez Moreno, F. Marzari, G. Naletto, L. Sabau, A. Sanz Andrés, J. P. Sivan, G. Tondello, K. P. Wenzel

研究成果: 雜誌貢獻期刊論文同行評審

42 引文 斯高帕斯(Scopus)


Comets spend most of their life in a low-temperature environment far from the Sun. They are therefore relatively unprocessed and maintain information about the formation conditions of the planetary system, but the structure and composition of their nuclei are poorly understood. Although in situ and remote measurements have derived the global properties of some cometary nuclei, little is known about their interiors. The Deep Impact mission shot a projectile into comet 9P/Tempel 1 in order to investigate its interior. Here we report the water vapour content (1.5 × 1032 water molecules or 4.5 × 106 kg) and the cross-section of the dust (330 km2 assuming an albedo of 0.1) created by the impact. The corresponding dust/ice mass ratio is probably larger than one, suggesting that comets are 'icy dirtballs' rather than 'dirty snowballs' as commonly believed. High dust velocities (between 110 m s-1 and 300 m s-1) imply acceleration in the comet's coma, probably by water molecules sublimated by solar radiation. We did not find evidence of enhanced activity of 9P/Tempel 1 in the days after the impact, suggesting that in general impacts of meteoroids are not the cause of cometary outbursts.

頁(從 - 到)987-990
出版狀態已出版 - 13 10月 2005


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