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Nonlinear Dynamical Friction of a Circular-Orbit Perturber in a Gaseous Medium
Galaxy Astrophysics (astro-ph.GA)
2010/12/28
We use three-dimensional hydrodynamic simulations to investigate the nonlinear gravitational responses of gas to, and the resulting drag forces on, very massive perturbers moving on circular orbits.
The Banana Project. III. Spin-orbit Alignment in the Long-period Eclipsing Binary NY Cephei
techniques spectroscopic|stars kinematics and dynamics|stars early-type stars rotation|stars formation
2010/11/9
Binaries are not always neatly aligned. Previous observations of the DI Her system showed that the spin axes of both stars are highly inclined with respect to one another and the orbital axis. Here we...
WASP-38b: A Transiting Exoplanet in an Eccentric, 6.87d Period Orbit
Earth and Planetary Astrophysics (astro-ph.EP)
2010/12/24
We report the discovery of WASP-38b, a long period transiting planet in an eccentric 6.871815 day orbit. The transit epoch is 2455335.92050 +/- 0.00074 (HJD) and the transit duration is 4.663 hours. W...