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Astrometry with the Keck-Interferometer: the ASTRA project and its science
Jorg-Uwe Pott, Julien Woillez, Rachel L. Akeson +22
The sensitivity and astrometry upgrade ASTRA of the Keck Interferometer is introduced. After a brief overview of the underlying interferometric principles, the technology and conce…
Measuring Distance and Properties of the Milky Way's Central Supermassive Black Hole with Stellar Orbits
A. M. Ghez, S. Salim, N. N. Weinberg +10
We report new precision measurements of the properties of our Galaxy's supermassive black hole. Based on astrometric (1995-2007) and radial velocity (2000-2007) measurements from t…
Nonlinear Saturation of g-modes in Proto-Neutron Stars: Quieting the Acoustic Engine
Nevin N. Weinberg, Eliot Quataert
According to Burrows et al.'s acoustic mechanism for core-collapse supernova explosions, the primary, l=1, g-mode in the core of the proto-neutron star is excited to an energy of ~…
Carbon Detonation and Shock-Triggered Helium Burning in Neutron Star Superbursts
Nevin N. Weinberg, Lars Bildsten
The strong degeneracy of the 12C ignition layer on an accreting neutron star results in a hydrodynamic thermonuclear runaway, in which the nuclear heating time becomes shorter than…
Faint Thermonuclear Supernovae from AM Canum Venaticorum Binaries
Lars Bildsten, Ken J. Shen, Nevin N. Weinberg +1
Helium that accretes onto a Carbon/Oxygen white dwarf in the double white dwarf AM Canum Venaticorum (AM CVn) binaries undergoes unstable thermonuclear flashes when the orbital per…
Hydrodynamic Thermonuclear Runaways in Superbursts
Nevin N. Weinberg, Lars Bildsten, Edward F. Brown
We calculate the thermal and dynamical evolution of the surface layers of an accreting neutron star during the rise of a superburst. For the first few hours following unstable 12C…