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Previous issue date: 2011-11-29 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / Since Michel Mayor and his student Didier Queloz s pioneer announcement, in 1995, of the
existence of a planet orbiting the star 51 Peg, up to present date, 695 extrasolar planets orbiting
stars of spectral type F, G, K and M have been discovered. A study on the behavior of the total
angular momentum of the planetary systems known up to present date becomes relevant when
we know that about 98% of the angular momentum of the solar system is associated with the
planets, although they represent only 0.15 percent of the mass of the whole system. In this
dissertation we study the behavior of stellar angular momentum, orbital angular momentum
and total angular momentum in a sample of 282 stars harboring planets, including 40 multiple
systems. We observed that planetary systems containing more than one known planet have both
higher orbital angular momentum and total angular momentum compared to those who have
only one planet. This analysis shows that multiplanet systems tend to have higher momenta,
suggesting that the planets in such systems that contribute to the greater portion momenta have
been found. Thus, planetary systems with lower values for the momenta represent the best
candidates to the discovery of new planets / Desde o anuncio pioneiro de Michel Mayor e seu ent?o estudante Didier Queloz, em 1995, da
exist?ncia de um planeta orbitando a estrela 51 Peg, at? a presente data, 695 planetas extrasolares
foram descobertos, orbitando estrelas do tipo espectral F, G, K e M. Um estudo sobre
o comportamento do momentum angular total dos sistemas planet?rios, conhecidos at? o momento,
torna-se relevante quando conhecemos que cerca de 98% do momentum angular do Sistema
Solar est? associado aos planetas, embora esses representem apenas 0,15% da massa de
todo o Sistema. Na presente disserta??o de mestrado estudamos o comportamento do momentum
angular estelar, do momentum angular orbital e do momentum angular total numa amostra
de 282 estrelas, abrigando planetas, incluindo 40 sistemas multiplos. Observamos que os sistemas
planet?rios contendo mais de 1 planeta conhecido possuem tanto momentum angular orbital
quanto momentum angular total mais elevado, comparado ?queles sistemas que possuem apenas
1 planeta. Esta an?lise mostra que sistemas planet?rios m?ltiplos tendem a ter momenta mais
elevado, sugerindo que em tais sistemas os planetas que contribuem com maior parcela para o
momenta j? foram descobertos. Sendo assim, sistemas planet?rios com menores valores para o
momenta representam melhores candidatos para a descoberta de novos planetas
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/16628 |
| Date | 29 November 2011 |
| Creators | Santana, Juliana Cerqueira de |
| Contributors | CPF:08896135400, http://lattes.cnpq.br/9151590034650501, Martins, Bruno Leonardo Canto, CPF:96670193491, http://lattes.cnpq.br/2673267660389058, Freitas, Daniel Brito de, CPF:57947139334, http://lattes.cnpq.br/2709876077692695, Medeiros, Jos? Renan de |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em F?sica, UFRN, BR, F?sica da Mat?ria Condensada; Astrof?sica e Cosmologia; F?sica da Ionosfera |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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