A Third Exoplanetary System with Misaligned Orbital and Stellar Spin Axes1

Abstract

JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org. ABSTRACT. We present evidence that the WASP-14 exoplanetary system has misaligned orbital and stellar-rotational axes, with an angle λ ¼ À33:1° AE 7:4° between their sky projections. The evidence is based on spectro-scopic observations of the Rossiter-McLaughlin effect as well as new photometric observations. WASP-14 is now the third system known to have a significant spin-orbit misalignment, and all three systems have " super-Jupiter " planets (M P > 3 M Jup) and eccentric orbits. This finding suggests that the migration and subsequent orbital evolu-tion of massive, eccentric exoplanets is somehow different from that of less massive close-in Jupiters, the majority of which have well-aligned orbits.