The rotation of a star and the revolutions of its planets are not necessarily aligned. This
article reviews the measurement techniques, key findings, and theoretical interpretations …

Hot Jupiters were the first exoplanets to be discovered around main sequence stars and
astonished us with their close-in orbits. They are a prime example of how exoplanets have …

The basic geometry of the Solar System—the shapes, spacings, and orientations of the
planetary orbits—has long been a subject of fascination as well as inspiration for planet …

We provide evidence that the obliquities of stars with close-in giant planets were initially
nearly random, and that the low obliquities that are often observed are a consequence of …

We use Keck/NIRSPEC to survey a sample of of young (< 1 Gyr), short-period mini-
Neptunes orbiting nearby K dwarfs to measure their mass loss via the metastable helium …

About 25 per cent of 'hot Jupiters'(extrasolar Jovian-mass planets with close-in orbits) are
actually orbiting counter to the spin direction of the star. Perturbations from a distant binary …

Convergent disk migration has long been suspected to be responsible for forming planetary
systems with a chain of mean-motion resonances (MMRs). Dynamical evolution over time …

We present the results of a survey aimed at discovering and studying transiting planets with
orbital periods shorter than one day (ultra-short-period, or USP, planets), using data from the …

Abstract Observing the Rossiter–McLaughlin effect during a planetary transit allows the
determination of the angle λ between the sky projections of the star's spin axis and the …

We present a large sample of stellar rotation periods for Kepler Objects of Interest, based on
three years of public Kepler data. These were measured by detecting periodic photometric …