Teses de Doutorado PPGA

 

Envíos recientes

  • JAIANE DA SILVA SANTOS, JAIANE DA SILVA SANTOS (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2026-02-20)
    The fundamental constants of Nature play a crucial role in our understanding of the Universe. They represent the limits of our knowledge of the laws of physics, but at the same time, they systematize new phenomena yet ...
  • Manoel Vicente de Souza Filho, Manoel Vicente de Souza Filho (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2026-01-29)
    The growth of cosmic structures is investigated through the analyses of f(z) and σ8(z) cosmic observables data, using non-parametric Gaussian Process reconstructions combined with MCMC statistical analyses. The standard ...
  • Feliphe de Souza Ferreira, Feliphe de Souza Ferreira (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2025-08-21)
    Small bodies are considered collisional and dynamical remnants from the formation of the Solar System, carrying essential information about the initial conditions of the protoplanetary disk. Thus, the study of their different ...
  • Danilo Ferreira da Rocha, Danilo Ferreira da Rocha (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2025-10-07)
    Be stars are fast-rotating B-type stars that display sometimes Balmer emission lines, especially Hα, produced in circumstellar decretion disks. In this thesis, we studied the role of binarity in these objects, aiming to ...
  • CARNEIRO WANDERLEY, FABIO (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2024-07-26)
    This thesis presents a spectroscopic analysis of M dwarf stars using high-resolution (R$\sim$22.500) near-infrared (1,514--1,696 $\mu$m) spectra from the SDSS/APOGEE survey. Our methodology adopts spectrum synthesis with ...
  • PEREIRA, CHRYSTIAN LUCIANO (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2024-08-27)
    The first detection of a ring system through stellar occultation, a significant milestone in the history of planetary science, occurred in 1977. Then, astronomers unexpectedly discovered Uranus’s rings while studying the ...
  • NOGUEIRA RIBEIRO, BRUNO WESLEY (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2024-08-27)
    itulo original da tese: ON THE COSMIC ACCELERATION AND MATTER CLUSTERING IN MODIFIED f(R) GRAVITY MODELS Understanding the origin of the current accelerated expansion of the universe is one of the greatest challenges in ...
  • LEMOS PORCIUNCULA ALVES, THAIS (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2024-10-25)
    Fast radio bursts (FRBs) are a new class of high-energy transient events with short duration within the radio frequency range from a few hundred to a few thousand MHz. Although the physical mechanism responsible for these ...
  • BARBOSA DA FONSECA TEIXEIRA, DINORAH (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2024-10-31)
    The fact that Einstein’s equations connect the space-time geometry to the total dark content of the cosmic substratum, but not to individual contributions of its constituents, can be translated into a degeneracy in the ...
  • BARROS DE CICCO, MARCELO ANTONIO (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2024-07-29)
    EXOSS (Exploring Southerns Skies for New Radiants) it is a citizen science project that started its activities on May 2015 and later became a master graduate project developing its operational and scientific structure, ...
  • MICHIMANI GARCIA, JONATAN (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2023-12-07)
    The study of Mars-crossers (MCs) and near-Earth objects (NEOs) allows us to gather information about the Solar System’s smallest bodies due to their proximity to Earth. In this work, we present the results of photometric ...
  • PEREIRA, ALAN WAGNER (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2024-03-15)
    This thesis investigated the variability of a set of B-type stars, using light curves from space telescopes Kepler and TESS. The analysis of 122 stars from the Kepler/K2 campaign 11 revealed a wide diversity of variability ...
  • TACURI, VERONICA LOAIZA (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2024-02-02)
    In this thesis we present a spectroscopic study of 201 stars of F-, G-, and K-type stars that host exoplanets discovered by the Kepler and Kepler 2 (K2) mission. We analyzed two samples, one containing 81 stars from K2 and ...
  • DE JESUS SANTOS, WILTON (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2024-03-28)
    Open clusters, rich in gas and dust, are excellent environment for star formation. The formation of massive stars, however, requires specific conditions, associated with the giant molecular clouds. Massive stars of spectral ...
  • LEAL DIAS, BRUNO (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2024-02-20)
    We investigate the transition scale to homogeneity, RH , using as cosmic tracer the spectroscopic sample of blue galaxies from the Sloan Digital Sky Survey (SDSS). Considering the spatial distribution of the galaxy sample, ...
  • QUISPE HUAYNASI, FREDI (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2023-04-14)
    Stars with high velocities in the Galaxy are linked to extreme astrophysical events. The number of stars and the chemical and kinematic information of this population is essential to infer their places of origin, the ...
  • FRANCO DE OLIVEIRA, PATRICK (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2023-04-17)
    The origin of Mercury still remains poorly understood compared to the other rocky planets of the Solar System. One of the most relevant constraints that any formation model has to fulfill refers to its internal structure, ...
  • ROMMEL, FLAVIA LUANE (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2022-12-19)
    Forty-five years had elapsed since the discovery of Chiron, three decades since the first observation of a trans-Neptunian object (except Pluto), and currently, thousands of small objects have been discovered in the outer ...
  • BATALHA DE MELO, REBECA MARIA (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2022-10-14)
    This PhD thesis investigates the transport of metals from member galaxies of clusters and groups of galaxies to the intragroup/cluster medium and the efficiency of the mechanisms involved in the enrichment of metals in ...
  • EVANGELISTA SANTANA, MARCAL (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2022-11-30)
    Abstract This work presents a study of the characterization of some hyperbolic comets. These objects represent approximately $12\%$ of the total population of comets and are potentially important since within the population ...

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