Banca de DEFESA: RODRIGO DA SILVA SOBRINHO

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : RODRIGO DA SILVA SOBRINHO
DATA : 27/06/2019
HORA: 10:00
LOCAL: Auditório do CCET
TÍTULO:

Infrared excess in rotational stars analogs to the Sun: Looking for exo-asteroid belts

PALAVRAS-CHAVES:

Infrared excess, Debris disk, Asteroid belt, Kuiper belt.

PÁGINAS: 124
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Física
RESUMO:

Observations of circunstelar matter disks provide a powerful tool for our understanding of planetary systems dynamics. Analogs to the Solar System asteroid belts, such disks results, mainly, from the collision of remaining solid material from the planetary formation process. Even if the current literature describe the presence of circunstelar disk in hundreds of Main Sequence stars, its detection around stars similar to the Sun is still very uncommom. In this context, this present study is focused on the search for debris disk orbiting stars with superficial physical parameters similar to solar values, including, particularly, rotation period, from photometric observations in the infrared, in
the 3.4, 4.6, 12 and 22 μm bands, made by the space mission WISE (Wide-field Infrared Survey Explorer). As central object, a sample of 881 stars was defined with effective temperature, metallicity, gravity and rotation period similar to solar values. These stars, defined here as rotational analog to the Sun, have a well determined rotation period, calculated from photometric modulation identified in light curves obtained by the space telescope Kepler. Six stars, KIC 1868785, 7267949, 7435796, 10533222, 11352643, and KIC 11666436, present clear signs of infrared excess, a revealing diagnosis of the presence of circunstellar matter orbiting them. The disks of matter detected are much more dense and luminous than the Solar System zodiacal dust, pointing to a origin associated to recent violent events.

MEMBROS DA BANCA:
Interno - 1675216 - BRUNO LEONARDO CANTO MARTINS
Externo à Instituição - EDUARDO JANOT PACHECO - USP
Interno - 3060853 - IZAN DE CASTRO LEÃO
Presidente - 346785 - JOSE RENAN DE MEDEIROS
Externa à Instituição - MARIA LIDUINA DAS CHAGAS - UNIFESSPA