7/8 Special Summer Seminar: An Inverted Transit caused by Gravitational Lensing

in Seminars
July 7th, 2014

Special Summer Seminar

An inverted transit in the Kepler data caused by gravitational lensing

Prof. Eric Agol
University of Washington

Tuesday, 8 July 2014
CAS 500


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.