Microlensing Discovery and Characterization Efficiency in the Vera C. Rubin Legacy Survey of Space and Time


Natasha Abrams

The Vera C. Rubin Legacy Survey of Space and Time will find thousands of microlensing events across the sky. It will go to deeper limiting magnitudes over a wider footprint than any previous survey. This will allow us to probe microlensing events across the Galaxy. We evaluate Rubin Operation Simulations (OpSims) to assess the discovery and characterization efficiencies of microlensing events. We have implemented three metrics: a discovery metric and two characterization metrics, where one estimates how well the lightcurve is covered and the other quantifies how precisely event parameters can be determined. We find, given Rubin's baseline cadence, the discovery efficiency will be higher for longer duration events. The more that Rubin observes the Galactic Plane, particularly the Galactic Bulge due to the higher stellar density, the discovery rate will increase. However, if the observations are stretched over too wide an area, event characterization suffers. Even without full characterization of events, Rubin observations will be invaluable as discovery alerts for other telescopes. 


This talk will be given in the Crowded Stellar Fields session.


Career Stage: 
Grad Student