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  • ANTUNES MARQUES, GABRIELA (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2019-07-17)
    The photons propagating in the Universe have their trajectories disturbed due to the presence of massive structures along the line-of-sight, producing the so-called gravitational lensing effect. Because it is sensitive to ...
  • ARAGAO HASSELMANN, PEDRO HENRIQUE (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2015-08-25)
    The two main Small Body populations, asteroids and comets, present different physical-chemical caracteristics on their surfaces. Most of the studies of their surfaces is based on the observation of integrated light from ...
  • AYALA LOERA, MA DEL CARMEN (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2019-07-25)
    This work reports the results of photometric studies of transNeptunian objetcs (TNOs). Absolute magnitudes and phase coefficient from TNOs were computed (H V and β V for 124 TNOs and H R and β R for 123 TNOs). We computed ...
  • BAELLA PAJUELO, NOBAR OCTAVIO (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2012-03-30)
    Entre as 180 estrelas simbióticas conhecidas existe um grupo especial classificado como simbióticas amarelas Tipo-S (SATS). Esses objetos apresentam uma alta velocidade radial e baixa metalicidade que correspondem a ...
  • BANDA HUARCA, MARTIN VALENTIN (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2020-03-23)
    The Dark Energy Survey (DES) is an international collaborative effort to reveal the nature of the mysterious dark energy which is responsible for the accelerated expansion of the universe. For this, the survey mapped about ...
  • 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 ...
  • BATISTA SOUZA, TIAGO (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2021-12-08)
    Classical Be stars are defined as those stars whose spectrum has, or had for some time, one or more Balmer lines in emission. These stars show a transient gaseous circumstellar disk, whose formation process is still not ...
  • BENEDETTI ROSSI, GUSTAVO (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2016-03-01)
    After almost 25 years of the discovery of the first trans-Neptunian object (TNO), besides Pluto, more than 1930 other objects were discovered at the outer solar system. The study of those bodies can provide precious ...
  • BOUFLEUR, RODRIGO CARLOS (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2017-08-28)
    One of the most promising topics in modern astronomy is the discovery and characterization of extrasolar planets. Space missions dedicated to search exoplanets produced a formidable amount of data. In particular the Kepler ...
  • BRANDO SOARES, GABRIEL (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Geofísica, 2022-12-05)
    This thesis is divided in three main parts: Parts I, II and III. Part I is a brief review about essential concepts related to Earth's magnetic field and atmosphere, aiming a better understanding of the subsequent Parts II ...
  • CACERES REATEGUI, JESSICA GIOVANNA (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2020-01-29)
    Large The Influence of Planet Nine on the TNOs Orbits Abstract The hypothesis about the existence of an additional planet residing in the external solar system was recently proposed to explain the orbital confinements ...
  • COSTA DE SOUZA, ALAN (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2020-03-30)
    GPU PARALLELIZATION OF N-BODY ALGORITHMS AND APPLICATIONS TO EXTRASOLAR PLANETARY SYSTEMS Alan Costa de Souza ABSTRACT In this thesis, we analyzed the feasibility and implemented the parallelization of algorithms to solve ...
  • COUTINHO DE CARVALHO, GABRIELA (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2015-09-11)
    The distribution of galaxies, provided by large astronomical surveys, makes possible detailed studies of the nature of the primordial density fluctuations and the process of structure formation in the universe. Among the ...
  • DA SILVA ARCOVERDE, PLICIDA MARIA (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2022-06-29)
    The observation of near-Earth objects (NEOs) allows us to study the physical characteristics of the smallest bodies in our Solar System, as well as to impose restrictions on their origin and evolution. Among the various ...
  • DA SILVA ARCOVERDE, PLICIDA MARIA (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2022-06-29)
    The observation of near-Earth objects (NEOs) allows us to study the physical characteristics of the smallest bodies in our Solar System, as well as to impose restrictions on their origin and evolution. Among the various ...
  • DA SILVA AVILA, FELIPE (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2022-07-14)
    The cosmic growth rate, $f(z)$, presents great potential to discriminate alternative models to $\Lambda$CDM, considered the standard model of cosmology. With its simple parametrization, $f(z)=\Omega_{\text{m}}^\gamma$, the ...
  • DE ALMEIDA BRAGANCA, GUSTAVO (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2016-03-14)
    In this work, we analysed high resolution spectra of a large sample of OB stars located in the Galactic disk aimed to study the distribution of the projected stellar rotation (vseni) and the radial distribution of chemical ...
  • DE CARVALHO FILHO, EDILSON (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2019-12-11)
    Abstract The large scale structure of the Universe has been studied at several redshifts using different cosmic tracers. Among the methods employed, the search for the signature of the baryon acoustic oscillations (BAO) ...
  • DE FIGUEIREDO GSCHWEND, JULIA (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2019-12-18)
    The Dark Energy Survey (DES) is an ongoing 5-year program that covers 5000 deg2 of the sky area in five optical-near infrared photometric bands (grizY), designed to measure the dark energy and dark matter densities and the ...
  • DE JESUS RONDON BRICENO, EDUARDO (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2016-12-21)
    Seventeen asteroids of the main belt and three near earth asteroids have shown cometary activity. These objects have been called Active Asteroids (AA) (Jewitt, 2012). The physical source of their activity can be diverse; ...