Banca de DEFESA: ANDRÉ CHAVES DE BRITO

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : ANDRÉ CHAVES DE BRITO
DATE: 30/06/2021
TIME: 15:00
LOCAL: Plataforma Google Meet
TITLE:

About Medium Infrared Excess in Binary Spectroscopic Systems

KEY WORDS:

Debris Discs, Spectroscopic Binary Stars, Infrared Excess.

PAGES: 112
BIG AREA: Ciências Exatas e da Terra
AREA: Física
SUMMARY:

The presence of circumstellar material is seen as a powerful indicator for the formation of

planetary systems similar to our Solar System. It is known that nearby binary stars have a more extensive

habitability zone when compared to individual stars, making them the target of several researches,

however, studies on debris discs in systems of this nature are still incipient. Faced with this con-

juncture, it is sought through this thesis, debris discs in spectroscopic binary systems. The sample

was obtained from the WEBDA database, initially containing 25 open agglomerates with the lar-

gest populations of spectroscopic binary stars available, totaling 1033 candidates. The search for

excess in the infrared occurred in the 3.4 μm, 4.6 μm, 12 μm and 22 μm bands of WISE and was

performed through a comparison from the SEDs (Spectral Energy Distribution) obtained by the

photometric data from the GAIA missions, 2MASS and WISE and the synthesized curve genera-

ted by the BT-Settl model, available on the virtual platform VOSA (Observatory Sed Analyzer).

The stars with excess in the infrared have passed through visual inspection and had their galactic

latitudes checked, resulting in a final sample with 6 confirmed spectroscopic binary systems with

disc presence. After these procedures, the main parameters that characterize the debris discs were

calculated and, among other results, it was possible to verify that non-evolved binary spectroscopic

systems, belonging and open agglomerates, can house stable circumbinary debris discs.

BANKING MEMBERS:
Presidente - 1675216 - BRUNO LEONARDO CANTO MARTINS
Externo à Instituição - EDUARDO JANOT PACHECO - USP
Interno - 3060853 - IZAN DE CASTRO LEÃO
Interno - 346785 - JOSE RENAN DE MEDEIROS
Externo à Instituição - MARCOS PEREZ DIAZ - USP