Astrophysics Seminars

ABSTRACT: For the last six years, the Cassini spacecraft has been in orbit around Saturn, making a wide variety of measurements of the planet, its moons and its rings. Besides yielding such dramatic discoveries as the lakes of liquid hydrocarbons...

Hot Jupiter atmospheres are thought to harbor relatively deep, statically stable radiative layers due to the intense irradiation they receive from their host stars. This reduces the planet's ability to cool and inhibits vertical transport of heat...

ABSTRACT: A detailed and precise understanding of the formation of neutral atomic hydrogen is necessary to predict the spectrum of microwave anisotropies. New experiments like Planck and ACT will gain considerable leverage on the cosmological...

ABSTRACT: In addition to the major planets, the solar system contains a large number of so-called small bodies in dynamically distinct reservoirs. These include the main-belt asteroids, main-belt comets, Trojans, Centaurs, irregular satellites, the...

ABSTRACT: Observations of the gamma-ray sky by the Fermi Gamma-ray Space Telescope have revealed a striking sharp-edged, double-lobed structure in 1-100 GeV gamma rays, centered on the Galactic Center and extending 50 degrees north and south of the...

ABSTRACT: Herschel Space Observatory, a 3.5m far-infrared telescope, was launched 14 May 2009, and is now located at the Earth-Sun L2 point, carrying out imaging and spectroscopy at wavelengths from 70um to 500um with LHe-cooled detectors. For...

ABSTRACT: We take a fresh look at high energy radioactive nuclei data reported in the 90's and at the positron data recently reported by PAMELA. Our aim is to study the model independent implications of these data for the propagation time scales of...