Oh now THIS is very intriguing! Bernhard and Lloyd with ZTF J185259.31+124955.2: A new evolved disc-eclipsing binary system where the shape of the transit is evolving significantly on every eclipse - look at how much it changes… just wow. 🔭🪐 #astrodon

Six light curves showing broader and broader eclipses with the bottom of the eclipse being flat, but expanding each eclipse.
Matthew Kenworthy @kenworthy