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Exploring the solar system using stellar occultations and Gaia's sky survey
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Under the tutoring of Doctor Pedro Machado, I worked on the subject of stellar occultations for my Seminars and Traineeship courses and this thesis as well, focusing on the creation of independent codes that simulate and analyze this type of event. Along with the IA team, who are referred in the “Acknowledgements” chapter, we managed to plan and execute four observations since working together. The videos recorded during the observations were later analyzed with a software named Tangra to obtain text files and plots of the occultation. The simulations code was written to be user friendly, with the necessary input mostly found in a prediction’s file. The output is two data files, one for text and one for Mathematica, to plot the simulation and determine whether an observation is viable or not. The regression code uses a HeavisidePi function, useful for stellar occultations, as it is the branch separation of two constant functions. It determines the initial apparent flux, the flux drop and the beginning and duration of the stellar occultation. A further statistical analysis is ready, which also estimates the signal’s noise. Besides this experimental component, the Gaia Space Mission was also analyzed, including the first Data Release (September 2016), to determine how this type of observation can improve due to it. Thanks to Pedro, it’s simpler to look for stellar occultation events, and access was granted to a global network focused on these events, allowing the group to become aware of all the astrophysicists worldwide who dedicate their work to this as well as share results to better understand their meaning. A few meetings were held, including a trip to France, with one of the top astronomers in this field, Doctor Paolo Tanga, who gave a lecture on Gaia’s influence today and helped structuring this work for the second half of its duration.
Descrição
Tese de mestrado, Física (Astrofísica e Cosmologia), Universidade de Lisboa, Faculdade de Ciências, 2017
Palavras-chave
Sistema solar Ocultações estelares Programação Regressão Pequenos telescópios Teses de mestrado - 2017