19,432 research outputs found
A Probabilistic Approach to Classifying Supernovae Using Photometric Information
This paper presents a novel method for determining the probability that a
supernova candidate belongs to a known supernova type (such as Ia, Ibc, IIL,
\emph{etc.}), using its photometric information alone. It is validated with
Monte Carlo, and both space- and ground- based data. We examine the application
of the method to well-sampled as well as poorly sampled supernova light curves
and investigate to what extent the best currently available supernova models
can be used for typing supernova candidates. Central to the method is the
assumption that a supernova candidate belongs to a group of objects that can be
modeled; we therefore discuss possible ways of removing anomalous or less well
understood events from the sample. This method is particularly advantageous for
analyses where the purity of the supernova sample is of the essence, or for
those where it is important to know the number of the supernova candidates of a
certain type (\emph{e.g.}, in supernova rate studies).Comment: Version accepted for publication in Astrophysical Journa
U.S. Law of the Sea Cruise to Complete the Mapping of Necker Ridge, Central Pacific Ocean
U.S. Law of the Sea Cruise to Complete the Mapping of Necker Ridge, Central Pacific Ocean
CRUISE KM1121
July 31, to August 10, 2011
Honolulu, HI to Honolulu, H
Transfer Matrix Analysis of the Unidirectional Grating-Assisted Codirectional Coupler
The unidirectional grating-assisted codirectional coupler (U-GACC) has recently been proposed. This unique structure permits irreversible coupling between orthogonal waveguide eigenmodes by means of simultaneous modulation of both the real and imaginary parts of the refractive index in the coupling region. Analysis of the U-GACC has until now relied on coupled mode theory, which can be restrictive in its application as a design tool. We analyze the U-GACC by the transfer matrix method, which demonstrates in a simple fashion why the device operates in a unidirectional manner. In addition, we show that for all practical designs, there is a limit to the minimum cross talk between outputs, a phenomenon that has not been previously identified
U.S. Law of the Sea Cruise to Map the Foot of the Slope of the Northeast U.S. Atlantic Continental Margin: Leg 6
U.S. Law of the Sea Cruise to Map the Foot of the Slope of the Northeast U.S. Atlantic Continental Margin: Leg 6
Cruise KNOX17RR
May 1 – 31, 2008
Ft. Lauderdale, FL to Woods Hole, M
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