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Journal Articles The Astrophysical journal letters Year : 2022

Spectral Evolution of Dark Asteroid Surfaces Induced by Space Weathering over a Decade

Sunao Hasegawa
Francesca Demeo
Michaël Marsset
Josef Hanuš
Chrysa Avdellidou
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  • PersonId : 1063812
Marco Delbo
Schelte Bus
Hidekazu Hanayama
Takashi Horiuchi
Driss Takir
Emmanuël Jehin
Marin Ferrais
Jooyeon Geem
Myungshin Im
Jinguk Seo
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Yoonsoo Bach
Sunho Jin
Masateru Ishiguro
Daisuke Kuroda
Richard Binzel
Akiko Nakamura
Bin Yang
Pierre Vernazza


Abstract The surfaces of airless bodies like asteroids in the solar system are known to be affected by space weathering. Experiments simulating space weathering are essential for studying the effects of this process on meteorite samples, but the problem is that the time spent to reproduce space weathering in these experiments is billions of times shorter than the actual phenomenon. In 2010 December, the T-type asteroid 596 Scheila underwent a collision with an impactor a few tens of meters in size. A decade later, there is an opportunity to study how the surface layer of this asteroid is being altered by space weathering after the impact. To do so, we performed visible spectrophotometric and near-infrared spectroscopic observations of 596 Scheila. The acquired spectrum is consistent with those observed shortly after the 2010 impact event within the observational uncertainty range. This indicates that the surface color of dark asteroids is not noticeably changed by space weathering over a 10 yr period. This study is the first to investigate color changes due to space weathering on an actual asteroid surface in the solar system. Considering that fresh layers are regularly created on asteroid surfaces by collisions, we suggest a genetic link between D/T-type and dark (low albedo) X-complex asteroids and very red objects such as 269 Justitia, 732 Tjilaki, and 203 Pompeja. New observations show that 203 Pompeja has an X-type-like surface, with some local surface areas exhibiting a very red spectrum.
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hal-03854455 , version 1 (16-11-2022)





Sunao Hasegawa, Francesca Demeo, Michaël Marsset, Josef Hanuš, Chrysa Avdellidou, et al.. Spectral Evolution of Dark Asteroid Surfaces Induced by Space Weathering over a Decade. The Astrophysical journal letters, 2022, 939 (1), pp.L9. ⟨10.3847/2041-8213/ac92e4⟩. ⟨hal-03854455⟩
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