An international team of astronomers using the Subaru Telescope has detected a stellar companion and a Jupiter-sized exoplanet orbiting the star GSC 03547-01402 that has been known to harbor a giant retrograde planet. The discovery offers new insights into how retrograde planets may form and endure. This is an image of HAT-P-7 and its companion star HAT-P-7B, left, taken with the Subaru Telescope (NAOJ) GSC 03547-01402, also known as HAT-P-7 and Kepler-2,...
