7/8 Special Summer Seminar: An Inverted Transit caused by Gravitational Lensing
Special Summer Seminar
An inverted transit in the Kepler data caused by gravitational lensing
Prof. Eric Agol
University of Washington
Tuesday, 8 July 2014
When compact objects eclipse their companion stars, gravitational lensing can cause brightening rather than dimming. I will derive the criterion for when lensing dominates over occultation, and show that lensing in binaries appears as repeated inverted transits. I will review some predictions for lensing by white dwarfs in the Kepler data, and then I will introduce the first detection in the Kepler data of a ‘self-lensing’ binary by graduate student Ethan Kruse, KOI-3278, and describe its characterization based upon photometry and stellar models.