Banca de DEFESA: DASAEV OLIVEIRA FONTINELE

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : DASAEV OLIVEIRA FONTINELE
DATE: 20/12/2022
TIME: 15:00
LOCAL: online
TITLE:

ON THE RELATIONS BETWEEN HABITABLE ZONE AND CIRCUNSTELLAR DEBRIS DISK

KEY WORDS:

Debris disk, Habitable Zone, Main sequence.

PAGES: 54
BIG AREA: Ciências Exatas e da Terra
AREA: Física
SUMMARY:

There are several studies related to the presence of debris disk with metallicity, rotation and age of stars. However, little is
known in the literature about the relationship between the presence of a debris disk and the circumstellar habitability zone and
how the range of the habitability zone affects the disk. To carry out this work, we selected the main catalog of (Cotten & Song
2016), this catalog contains 507 stars showing potential excess infrared, without ambiguities, from observations made with the
WISE satellite.
For a better understanding of the profile of the stars present in the catalog, the Cor-Magnitude GAIA was built, based on the
methodologies of (Messias et al. 2022) and (Gordon et al. 2021), for the exhibition of the work. We can see in this diagram that
only 171 stars belong to the Main Sequence, this selection was made due to the evolutionary stage of the stars, it is susceptible
to important biases, which can influence the results obtained. With the sample of Main Sequence stars, the (Kopparapu et al.
2014) model was applied to calculate the Circumstellar Habitability Zones. As this model has a temperature limit of 2700K to
7200K, only 83 stars fall within the approached limit. By calculating the distance from the habitability zone, it was possible to
separate the sample into 3 small groups: stars that have a debris disk radius greater than the outer radius of the conservative
ZH; stars that have the radius of the debris disk inside the conservative ZH; stars that have a debris disk radius smaller than the
inner radius of the conservative ZH. Finally, we compare our results with the mean radius of the asteroid belt in order to
observe systems with architecture similar to the solar one.

COMMITTEE MEMBERS:
Interno - 1675216 - BRUNO LEONARDO CANTO MARTINS
Externa à Instituição - HELOISA MARIA BOECHAT-ROBERTY - UFRJ
Interno - 3060853 - IZAN DE CASTRO LEÃO
Interno - 346785 - JOSE RENAN DE MEDEIROS