Norio Narita

Title: Aligned, tilted, retrograde exoplanets and their migration mechanisms

Abstract: How do planetary systems form? To answer this question,
orbits of exoplanets provide us important clues. In this talk,
I will introduce recent discoveries of aligned, tilted,
and retrograde exoplanets based on spectroscopic transit
observations. Indeed, inclined (including retrograde) orbits,
which are not seen in the planets of the Solar System,
emerge as common in exoplanetary systems. The fact strongly
indicates that some different planetary migration mechanisms
occur during the planet formation epoch. I will summarize
current planetary migration models, a methodology to measure
the obliquity of transiting planets, and future strategies
to specify which (if any) of planetary migration mechanisms
is responsible for the diverse planetary orbits