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Abstract:

The surfaces of small bodies in the outer Solar System are rich in organic compounds and carbonaceous refractories mixed with ices and silicates. As made clear by dedicated laboratory experiments space weathering (e.g. energetic ion bombardment) can produce red colored materials starting from bright and spectrally flat ices. In a classical scenario, the space weathering processes "nurture" alter the small bodies surface spectra but are in competition with resurfacing agents that restore the original colors, and the result of these competing processes continuously modifying the surfaces is supposed to be responsible for the observed spectral variety of those small bodies. However an alternative point of view is that the different colors are due to "nature" i.e. to the different primordial composition of different objects. In this paper we present a model, based on laboratory results, that gives an original contribution to the "nature" vs. "nurture" debate by addressing the case of surfaces showing different fractions of rejuvenated vs. space weathered surface, and calculating the corresponding color variations. We will show how a combination of increasing dose coupled to different resurfacing can reproduce the whole range of observations of small outer Solar System bodies. Here we demonstrate, for the first time that objects having a fully weathered material turn back in the color-color diagrams. At the same time, object with the different ratio of pristine and weathered surface areas lay on specific lines in color-color diagrams, if exposed to the same amount of irradiation. © 2012 Elsevier Inc.

Registro:

Documento: Artículo
Título:Space weathering and the color indexes of minor bodies in the outer Solar System
Autor:Kaňuchová, Z.; Brunetto, R.; Melita, M.; Strazzulla, G.
Filiación:INAF-Osservatorio Astrofisico di Catania, Via S. Sofia 78, I-95123 Catania, Italy
Astronomical Institute of Slovak Academy of Sciences, SK-059 60 Tatranská Lomnica, Slovakia
Institut d'Astrophysique Spatiale, CNRS, UMR-8617, Université Paris-Sud, bâtiment 121, F-91405 Orsay Cedex, France
Instituto de Astronomía y Física del Espacio (IAFE), Buenos Aires, Argentina
Palabras clave:Centaurs; Spectroscopy; Trans-Neptunian Objects; Trojan asteroids
Año:2012
Volumen:221
Número:1
Página de inicio:12
Página de fin:19
DOI: http://dx.doi.org/10.1016/j.icarus.2012.06.043
Título revista:Icarus
Título revista abreviado:Icarus
ISSN:00191035
CODEN:ICRSA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00191035_v221_n1_p12_Kanuchova

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Citas:

---------- APA ----------
Kaňuchová, Z., Brunetto, R., Melita, M. & Strazzulla, G. (2012) . Space weathering and the color indexes of minor bodies in the outer Solar System. Icarus, 221(1), 12-19.
http://dx.doi.org/10.1016/j.icarus.2012.06.043
---------- CHICAGO ----------
Kaňuchová, Z., Brunetto, R., Melita, M., Strazzulla, G. "Space weathering and the color indexes of minor bodies in the outer Solar System" . Icarus 221, no. 1 (2012) : 12-19.
http://dx.doi.org/10.1016/j.icarus.2012.06.043
---------- MLA ----------
Kaňuchová, Z., Brunetto, R., Melita, M., Strazzulla, G. "Space weathering and the color indexes of minor bodies in the outer Solar System" . Icarus, vol. 221, no. 1, 2012, pp. 12-19.
http://dx.doi.org/10.1016/j.icarus.2012.06.043
---------- VANCOUVER ----------
Kaňuchová, Z., Brunetto, R., Melita, M., Strazzulla, G. Space weathering and the color indexes of minor bodies in the outer Solar System. Icarus. 2012;221(1):12-19.
http://dx.doi.org/10.1016/j.icarus.2012.06.043