• Publications
  • Influence
Angular momentum loss in low-mass stars
The wind models discussed by Mestel (1984) are used here to formulate a general expression for the rate of angular momentum loss by magnetic stellar winds as a function of magnetic field
Masses, Radii, and Orbits of Small Kepler Planets: The Transition From Gaseous to Rocky Planets
We report on the masses, sizes, and orbits of the planets orbiting 22 Kepler stars. There are 49 planet candidates around these stars, including 42 detected through transits and 7 revealed by precise
Stellar interiors - physical principles, structure, and evolution
Stellar Modeling and Radiative and Conductive Heat Transfer are used to model the structure and evolution of the Sun and White Dwarfs.
Kepler-36: A Pair of Planets with Neighboring Orbits and Dissimilar Densities
Another violation of the orbit-composition pattern is reported: two planets orbiting the same star with orbital distances differing by only 10% and densities differing by a factor of 8, likely a rocky “super-Earth,” whereas the other is more akin to Neptune.
Ages and fundamental properties of Kepler exoplanet host stars from asteroseismology
We present a study of 33 {\it Kepler} planet-candidate host stars for which asteroseismic observations have sufficiently high signal-to-noise ratio to allow extraction of individual pulsation
Evolutionary models of the rotating sun
This paper reviews current work on the evolution of a differentially rotating solar model. Although we discuss global features of the evolution with rotation in general terms, the specific models
Accurate fundamental parameters and detailed abundance patterns from spectroscopy of 93 solar-type Kepler targets
We present a detailed spectroscopic study of 93 solar-type stars that are targets of the NASA/Kepler mission and provide detailed chemical composition of each target. We find that the overall
We have used asteroseismology to determine fundamental properties for 66 Kepler planet-candidate host stars, with typical uncertainties of 3% and 7% in radius and mass, respectively. The results
Stellar Spin-Orbit Misalignment in a Multiplanet System
Astronomy used asteroseismology to measure a large obliquity for Kepler-56, a red giant star hosting two transiting coplanar planets, to show that spin-orbit misalignments are not confined to hot-Jupiter systems.
Kepler Asteroseismology Program: Introduction and First Results
ABSTRACT.Asteroseismology involves probing the interiors of stars and quantifying their global properties, such as radius and age, through observations of normal modes of oscillation. The technical