1,359 research outputs found
Looks Can Be Deceiving—A Comparison of Initial Public Offering Procedures Under Japanese and U.S. Securities Laws
In order to examine the divergent administration of statutes that are by their terms similar, the initial public offering procedures that a non-sovereign domestic issuer follows in the US and Japan are described
Outbursts, State Transitions, and Periodicities Observed with the RXTE All-Sky Monitor
Results from the All-Sky Monitor (ASM) on the Rossi X-ray Timing Explorer are
reviewed. A number of recurrent transient sources have been detected, while
only a few previously unreported sources have been discovered. The ASM light
curves show a wide variety of phenomena in general, and, in particular, those
of transient sources show a wide range of properties. Examples are used to
illustrate that the distinction between persistent and transient sources may be
very unclear. The results of searches for periodicities in the ASM light curves
are summarized, and other astrophysical investigations using ASM light curves
are suggested. The latter include investigations of the possible causes of
long-term quasiperiodic and chaotic variability, and comparative studies on the
basis of the observed variability.Comment: 8 pages, 4 figures, in proceedings of the conference "The Active
X-ray Sky: Results from BeppoSAX and Rossi-XTE, Rome, Italy, 21-24 October,
1997. Nuclear Physics B Proceedings Supplement
A Study of the Shortest-Period Planets Found With Kepler
We present the results of a survey aimed at discovering and studying
transiting planets with orbital periods shorter than one day
(ultra--short-period, or USP, planets), using data from the {\em Kepler}
spacecraft. We computed Fourier transforms of the photometric time series for
all 200,000 target stars, and detected transit signals based on the presence of
regularly spaced sharp peaks in the Fourier spectrum. We present a list of 106
USP candidates, of which 18 have not previously been described in the
literature. In addition, among the objects we studied, there are 26 USP
candidates that had been previously reported in the literature which do not
pass our various tests. All 106 of our candidates have passed several standard
tests to rule out false positives due to eclipsing stellar systems. A low false
positive rate is also implied by the relatively high fraction of candidates for
which more than one transiting planet signal was detected. By assuming these
multi-transit candidates represent coplanar multi-planet systems, we are able
to infer that the USP planets are typically accompanied by other planets with
periods in the range 1-50 days, in contrast with hot Jupiters which very rarely
have companions in that same period range. Another clear pattern is that almost
all USP planets are smaller than 2 , possibly because gas giants in
very tight orbits would lose their atmospheres by photoevaporation when subject
to extremely strong stellar irradiation. Based on our survey statistics, USP
planets exist around approximately of G-dwarf stars, and
of K-dwarf stars.Comment: 20 pages, 10 figures. Submitted to ApJ. This version has been
reviewed by a refere
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