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- University of ArizonaUS428 papers
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6 papers · 1 filter
A near-IR spectroscopic search for very-low-mass cool companions to notable DA white dwarfs
P. D. Dobbie, M. R. Burleigh, A. J. Levan +5
We have undertaken a detailed near-IR spectroscopic analysis of eight notable white dwarfs, predominantly of southern declination. In each case the spectrum failed to reveal compel…
Constraints on the Size of the Smallest Triggering Earthquake from the ETAS Model, Baath's Law, and Observed Aftershock Sequences
D. Sornette, M. J. Werner
The physics of earthquake triggering together with simple assumptions of self-similarity impose the existence of a minimum magnitude m0 below which earthquakes do not trigger other…
Gravitational instability and clustering in a disk of planetesimals
P. Tanga, S. J. Weidenschilling, P. Michel +1
For a long time, gravitational instability in the disk of planetesimals has been suspected to be the main engine responsible for the beginning of dust growth, its advantage being t…
Magnitude-Dependent Omori Law: Empirical Study and Theory
G. Ouillon, D. Sornette
We propose a new physically-based ``multifractal stress activation'' model of earthquake interaction and triggering based on two simple ingredients: (i) a seismic rupture results f…
The Formation and Evolution of Planetary Systems: First Results from a Spitzer Legacy Science Program
M. R. Meyer, L. A. Hillenbrand, D. E. Backman +34
We present 3-160 micron photometry obtained with the IRAC and MIPS instruments for the first five targets from the Spitzer Legacy Science Program "Formation and Evolution of Planet…
Discrete Hierarchical Organization of Social Group Sizes
W. -X. Zhou, D. Sornette, R. A. Hill +1
The ``social brain hypothesis'' for the evolution of large brains in primates has led to evidence for the coevolution of neocortical size and social group sizes. Extrapolation of t…