Asteroseismology of Microlensing Source Stars in the Roman Galactic Bulge Time Domain Survey
| Program ID | 19032 |
|---|---|
| Science Category | Stellar Physics |
| Program Type | Analysis |
| Category | Small |
| Principal Investigator | Daniel Huber |
| PI Institution | University of Hawaii Institute for Astronomy |
| Co-Investigators |
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| Abstract | The Roman Galactic Bulge Time Domain Survey (GBTDS) will revolutionize the study of stars, stellar remnants and exoplanets using gravitational microlensing, with over 10,000 predicted events. A critical role in the analysis of microlensing events are the properties of the source star, which are required for calculating an accurate lensing model and solving for the lens mass. Source stars are typically assumed to be constant in flux and located at a distance corresponding to the Galactic Bulge. However these assumptions will be challenged with Roman due to its high sensitivity to disk populations and stellar variability. Here we propose to detect and characterize stellar variability of source stars in Roman GBTDS microlensing events, and use the tools of asteroseismology to determine their physical properties. This program will perform the first systematic simultaneous modeling of microlensing light curves and asteroseismic oscillations, uniquely enabled by Roman. The program is expected to (i) determine improved solutions for hundreds of GBTDS microlensing events, which will be used to investigate biases in analyses that assume constant source stars, and (ii) enable asteroseismology of the furthest red-giant stars to date, which will probe distinct regions of our Galaxy. |