| Grant number: | 17/23731-1 |
| Support type: | Scholarships in Brazil - Post-Doctorate |
| Effective date (Start): | November 01, 2018 |
| Effective date (End): | December 31, 2021 |
| Field of knowledge: | Physical Sciences and Mathematics - Astronomy - Stellar Astrophysics |
| Principal researcher: | Alex Cavaliéri Carciofi |
| Grantee: | Jonathan Michael Labadie-Bartz |
| Home Institution: | Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG). Universidade de São Paulo (USP). São Paulo , SP, Brazil |
| Associated research grant: | 18/04055-8 - High precision spectroscopy: from the first stars to planets, AP.TEM |
Abstract The primary goal of this project is to bring Jonathan Labadie-Bartz to work with Prof. Alex C. Carciofi and his research group to study the population of Be stars. The proposed projects will not only serve to better understand rapidly rotating massive stars and disk physics, but will contribute to our understanding of stellar evolution and how the life and fate of massive stars is influenced by their rotation and composition.The primary research project involves combining a wealth of observational data with the stellar and disk models that are being developed in Prof. Carciofi's research group. A recently developed pipeline will be used to model time-series photometry (light curves) for over a thousand Galactic Be stars, providing us with a better understanding of the distribution of stellar and disk properties inherent in this population. The applicant has extensive experience working with this type of data, and the relevant light curve data are already on-hand. Our results will have a significant impact in regards to Be star science, as this will be the largest and most comprehensive work to date that categorizes both the star and the disk for Galactic metallicities. Beyond the category of Be stars, these results will provide important constraints on theories regarding the structure and evolution of rapidly rotating stars, specifically studying how mass and angular momentum is lost over their main sequence life time. Additionally, this work will shed light on astrophysical disks.Parallel projects by Prof. Carciofi's research group are currently underway for Be stars in the Large and Small Magellanic Clouds. With results from the LMC, SMC, and the Milky Way, we will begin to understand the role of metallicity in not only the Be phenomenon, but also the effect that composition has on stellar evolution and the rates of mass and angular momentum loss.The second part of this project will involve light curve analysis of Be stars without invoking models, using techniques developed by the applicant. New Be star candidates will be identified, with the potential to increase the number of known such systems by a substantial amount. Light curves will be leveraged to refine our understanding of the way in which Be stars lose mass, to explore the role and incidence rates of binarity, and to study pulsation, which likely has a significant roll in the mechanism by which Be stars eject mass.With the proliferation of both present and future astronomical surveys, time-domain astronomy is becoming increasingly important in stellar astrophysics (as well as in other fields). The applicant has extensive experience in analyzing time- series data. These methods will be shared with Prof. Carciofi's research group. In particular, the applicant will train members of the group to apply the already-developed techniques not just to KELT data, but also to other surveys. | |
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