Satellites of Saturn: Stability, Capture and Analysis of the Excitations on the Ec...
Possible Obliquity variations of the planets during planetary migration
Origins of the Irregular Satellites of Jupiter: Capture mechanisms and their plaus...
| Grant number: | 12/23732-4 |
| Support Opportunities: | Scholarships abroad - Research Internship - Doctorate |
| Start date: | May 01, 2013 |
| End date: | October 31, 2013 |
| Field of knowledge: | Physical Sciences and Mathematics - Astronomy - Positional Astronomy and Celestial Mechanics |
| Principal Investigator: | Tadashi Yokoyama |
| Grantee: | Rogerio Deienno |
| Supervisor: | David Nesvorny |
| Host Institution: | Instituto Nacional de Pesquisas Espaciais (INPE). Ministério da Ciência, Tecnologia e Inovação (Brasil). São José dos Campos , SP, Brazil |
| Institution abroad: | Southwest Research Institute, San Antonio (SwRI), United States |
| Associated to the scholarship: | 10/11109-5 - Satellites of Saturn: Stability, Capture and Analysis of the Excitations on the Eccentricity and Inclination of the Regular Satellites During the Planetary Migration, BP.DR |
Abstract In the Nice model (Tsiganis et al 2005 - NiceI) it is accepted that the regular satellites survived to the planetary migration and the irregulars were captured after or during the migration itself. Nesvorný et al 2007 studied the capture process of irregular satellites during the phase of the planetary close encounters. In this work, the authors can successfully explain how Uranus and Neptune capture their satellites. Nesvorny et al 2007 also apply their methodology to the planet Saturn, which is involved in a few number of close encounters, resulting therefore in a low capture efficiency. For Jupiter, such methodology cannot be tested due to the fact that in the NiceI model, encounters between Jupiter and the others ice giants are rare. Currently, the new models proposed by Morbidelli et al 2007, Brasser et al 2009, and mainly Nesvorný 2011 and Nesvorný & Morbidelli 2012, predict that Jupiter needs to have close encounters with others ice giant planets. Following this basic ideia, Bottke et al 2010 claim that due to these Jupiter´s encounters with other planets, the methodology proposed by Nesvorný et al 2007 can be feasible. However, this has never been tested. So little is known about how many encounters would be necessary for Jupiter to capture its entire collection of irregular satellites, or even if these families could be reproduced. In Deienno et al 2011, we used a similar methodology but attaching non zero mass to the captured planetesimals. In addition, we included the presence of the main regular satellites in the model. As a result, we got a good scenario for the capture of Uranus' irregular satellites. However, applying this methodology to Saturn, we verified a low efficiency of capture of irregular satellites, just as obtained by Nesvorný et al 2007. Thus, in this project, in colaboration with Dr David Nesvorný, and considering his recent planetary migration models (Nesvorný 2011 and Nesvorný & Morbidelli 2012), we propose to revisit the process of capture of irregular satellites of Jupiter and Saturn. We also hope to determine important constraints in the planetary migration models. (AU) | |
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