2,265 research outputs found
Determination of stellar, orbital and planetary parameters using complete Monte-Carlo analysis -- the case of HAT-P-7b
The recently discovered transiting very hot Jupiter, HAT-P-7b, a planet
detected by the telescopes of HATNet, turned out to be among the ones subjected
to the highest irradiation from the parent star. As known, the combination of
photometric and spectroscopic data for such an object yields the stellar,
orbital and planetary parameters. In order to best characterize this particular
planet, we carried out a complex analysis based on a complete and simultaneous
Monte-Carlo solution using all available data. We included the discovery light
curves, partial follow-up light curves, the radial velocity data, and we used
the stellar evolution models to infer the stellar properties. This
self-consistent way of modeling provides the most precise estimate of the a
posteriori distributions of all of the system parameters of interest, and
avoids making assumptions on the values and uncertainties of any of the
internally derived variables describing the system. This analysis demonstrates
that even partial light curve information can be valuable. This may become very
important for future discoveries of planets with longer periods -- and
therefore longer transit durations -- where the chance of observing a full
event is small.Comment: 4 pages, 2 figures. To appear in the Proceedings of IAU Symposium
253, "Transiting Planets", May 2008, Cambridge, MA, US
Potential of Florida\u27s Effective Assistance of Counsel Doctrine to Increase Parent Engagement and Promote the Well-Being of Children
Parallel netCDF: A Scientific High-Performance I/O Interface
Dataset storage, exchange, and access play a critical role in scientific
applications. For such purposes netCDF serves as a portable and efficient file
format and programming interface, which is popular in numerous scientific
application domains. However, the original interface does not provide an
efficient mechanism for parallel data storage and access. In this work, we
present a new parallel interface for writing and reading netCDF datasets. This
interface is derived with minimum changes from the serial netCDF interface but
defines semantics for parallel access and is tailored for high performance. The
underlying parallel I/O is achieved through MPI-IO, allowing for dramatic
performance gains through the use of collective I/O optimizations. We compare
the implementation strategies with HDF5 and analyze both. Our tests indicate
programming convenience and significant I/O performance improvement with this
parallel netCDF interface.Comment: 10 pages,7 figure
Theory and Class Struggle: Three Interviews
Raju Das and Robert Latham interview Lilia Monzo, Tom Brass, and Alfred Saad-Filho in the initial piece for the new Theory and Class Struggle section of Class, Race and Corporate Power
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