Formação de planetas terrestres: o caso de colisões ineficientes

• Autor(a) principal: Oliveira, Patrick Franco de [UNESP]
• Data de Publicação: 2016
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/155329; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2017-04-19/000881821.pdf
• topic: Metodos de simulação; Planetas; Colisões (Fisica); Mercúrio; Planets

Studies of terrestrial planets formation are usually based on numerical simulations of Nbodies, where collisions involving planetesimals and/or embryos are generally considered constructive, that is, they generate a new body whose mass is the sum of the masses involved and the total linear momentum is conserved. This approach works reasonably well for the Earth, Venus, and Mars formation. However, the planet Mercury has characteristics that classify it like a body formed only by the core, without a mantle proper. This is supposed to occur due to inefficient collisions, where two bodies in the advanced stage of formation (protoplanets) collide and result in two other bodies in which part of their material is lost. This kind of information can be obtained from numerical simulations in which collision conditions are recorded. Here, our intention was to establish parameters to help us better understand how collisions occurred, to look for possible inefficient collisions, and then to analyze if these collisions could have formed a planet with the structural characteristics of Mercury, as proposed in Asphaug & Reufer (2014). In this sense, we did a previous simulation choosing model and method used by Izidoro et al. (2014) that presented better results. Thereby, we obtained possible candidates for inefficient collisions in terms of the impact parameter and the speed parameter. However, when we analyzed the relative energy parameter we found that our simulation was unable to present this type of collision because the impacts had low energy. Therefore, more simulations will be carried out in future works, to verify if this result will in fact persist