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Artículo

Collisional and dynamical evolution of the L4 Trojan asteroids

de Elia, Gonzalo CarlosIcon ; Brunini, AdrianIcon
Fecha de publicación: 11/2007
Editorial: EDP Sciences
Revista: Astronomy and Astrophysics
ISSN: 0004-6361
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Astronomía

Resumen

Aims. In this paper, we analyze the collisional and dynamical evolution of the population of L4 Jovian Trojans. Methods. To do this, we test different collisional parameters and include a dynamical treatment, taking into account the stability and instability zones of the L4 Trojan swarm. This procedure allows us to estimate the size distribution of the L4 Trojans, to study their mean collisional lifetimes, to analyze the formation of families, to obtain ejection rates of Trojan fragments and to discuss their possible contribution to the current populations of Centaurs and Jupiter-family comets. Results. Our estimates of the L4 Trojan cumulative size distribution show waves that propagate from diameters of ∼0.1 to ∼80 km around the values derived from optical surveys. On the other hand, the mean collisional lifetimes obtained from our simulations indicate that the large Trojan asteroids have likely survived without being catastrophically fragmented over the age of the Solar System. With regards to the Trojan removal, we calculate a maximum ejection rate of Trojan fragments from L4 of ∼50 objects larger than 1 km of diameter per Myr, which results to be significantly smaller than values previously published. Such estimates allow us to infer that the contribution of the Trojan asteroids to the current populations of Centaurs and Jupiter-family comets is negligible. In addition, our results are in agreement with the formation of few Trojan families in the L4 swarm. On the other hand, we infer that the current orbital distribution of the Trojan asteroids does not offer a strong constraint on the dynamical origin of this population. © ESO 2007.
Palabras clave: Methods: Numerical , Minor Planets, Asteroids , Solar System: Formation
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/54393
DOI: https://dx.doi.org/10.1051/0004-6361:20077979
URL: https://www.aanda.org/articles/aa/abs/2007/43/aa7979-07/aa7979-07.html
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Articulos(IALP)
Articulos de INST.DE ASTROFISICA LA PLATA
Citación
de Elia, Gonzalo Carlos; Brunini, Adrian; Collisional and dynamical evolution of the L4 Trojan asteroids; EDP Sciences; Astronomy and Astrophysics; 475; 1; 11-2007; 375-389
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