Banca de DEFESA: GUILHERME AUGUSTO DIAS MONTEIRO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : GUILHERME AUGUSTO DIAS MONTEIRO
DATA : 10/09/2018
HORA: 15:00
LOCAL: AUDITÓRIO DO DFTE
TÍTULO:

Application of DCDFT and MSL in the determination of variability periods of

eclipsing m-dwarf pairs

PALAVRAS-CHAVES:

Stars, Computational Methods, Orbital Period, Time series

PÁGINAS: 81
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Física
RESUMO:

In order to identify the periodicities of stars and to determine their various causes, studies begun millennia ago have reached a new level, unexpected until the end of last century. The discovery of the first exoplanet aroused one of the oldest questions of the human being: “Are we alone in the universe? ”. To answer this question, so-called planet-hunting satellites such as CoRoT and Kepler have been designed. They have observed hundreds of thousands of stars with unprecedented accuracy and duration. The light curves acquired by these satellites could present periodic variations from intermittences of the most diverse sources and their study allows to us a better understand of stars. In this work, codes were developed based on the DCDFT and MSL techniques that, implemented in an automation routine, allowed the determination of the orbital periods of 12 eclipsing binaries, composed by M Dwarfs and observed with Kepler satellite. The results from this analysis, compared to those pre-existing in the literature, enabled the evaluation of these methods. From this, it was possible to verify the inefficiency of the MSL for short periods, even with the reduction in search range, although the method was able to determine longer periods without difficulties. Meanwhile, the DCDFT was able to identify most of the periods correctly, with the exception of three cases where eclipses had an equivalent dimensions, leading the method to find only half the correct period.

MEMBROS DA BANCA:
Presidente - 2496004 - JOSE DIAS DO NASCIMENTO JUNIOR
Interno - 2887830 - MATTHIEU SEBASTIEN CASTRO
Externo ao Programa - 4857669 - JEFFERSON SOARES DA COSTA
Externo à Instituição - THARCISYO SA E SOUSA DUARTE - UFCA