Browsing Astronomy and Astrophysics by Title
Now showing items 89-108 of 193
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The isotropic blackbody CMB as evidence for a homogeneous universe
(American Physical Society, 2012-08-01)The question of whether the Universe is spatially homogeneous and isotropic on the largest scales is of fundamental importance to cosmology, but has not yet been answered decisively. Surprisingly, neither an isotropic ... -
Living in a Void: Testing the Copernican Principle with Distant Supernovae
(2008-07-09)A fundamental presupposition of modern cosmology is the Copernican Principle; that we are not in a central, or otherwise special region of the Universe. Studies of Type Ia supernovae, together with the Copernican Principle, ... -
MagAO IMAGING OF LONG-PERIOD OBJECTS (MILO). II. A PUZZLING WHITE DWARF AROUND THE SUN-LIKE STAR HD 11112
(Institute of Phisics, 2016-11)HD 11112 is an old, Sun-like star that has a long-term radial velocity (RV) trend indicative of a massive companion on a wide orbit. Here we present direct images of the source responsible for the trend using the Magellan ... -
MagAO imaging of long-period objects (MILO). II. A puzzling white dwarf around the sun-like star HD 11112
(IOP Publishing, 2016-11-10)© 2016. The American Astronomical Society. All rights reserved.HD 11112 is an old, Sun-like star that has a long-term radial velocity (RV) trend indicative of a massive companion on a wide orbit. Here we present direct ... -
Measuring the numerical viscosity in simulations of protoplanetary disks in Cartesian grids
(EDP Sciences, 2023-10)Context. Hydrodynamical simulations solve the governing equations on a discrete grid of space and time. This discretization causes numerical diffusion similar to a physical viscous diffusion, whose magnitude is often ... -
The Method of Images in Cosmology
We apply the method of images to the exact initial data for cosmological models that contain a number of regularly arranged discrete masses. This allows us to join cosmological regions together by throats, and to construct ... -
Migration of low-mass planets in inviscid discs: the effect of radiation transport on the dynamical corotation torque
(Oxford University Press (OUP), 2024-02-15)Low-mass planets migrate in the type-I regime. In the inviscid limit, the contrast between the vortensity trapped inside the planet’s corotating region and the background disc vortensity leads to a dynamical corotation ... -
Minimal distances between SCFTs
(2014-01-28)