Statistics – Computation
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20921010b&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #210.10; Bulletin of the American Astronomical Society,
Statistics
Computation
Scientific paper
The Kepler Mission is designed to characterize the frequency of Earth-size planets in the habitable zone of solar-like stars in the solar galactic neighborhood by observing 100,000 main-sequence stars in a 100 square degree field of view (FOV) and seeking evidence of transiting planets. To support engineering design and development of data analysis algorithms, we have developed the End-ToEnd Model (ETEM) of the Kepler photometer that produces simulations of data expected to arrive at the Kepler Science Operations Center. For a specified set of design and operating parameters, ETEM generates pixel time series for all pixels of interest for a single CCD channel of the photometer. The ETEM model incorporates engineering information such as the point-spread function, time histories of pointing offsets, operating temperature and the effects of shutterless readout. The model includes shot, read, quantization, and pointing-jitter-induced noise. Astrophysical parameters, such as a realistic distribution of stars vs. magnitude for the chosen FOV, zodiacal light, stellar variability, stellar background and cosmic ray events are included. To support the development of algorithms for the detection of transiting planets, planetary transit signals and false-positive signals such as background binary eclipses are modeled and injected into the ETEM output. We describe an extremely efficient computational approach to the problem of modeling on the order of a million stars over several thousand frames in a reasonably small time. The simulated data output by ETEM allows us to test our transit detection algorithms as well as study the impact of various engineering parameters and noise sources.
Funding for this mission is provided by NASA's Discovery Program Office.
Borucki William. J.
Bryson Stephen T.
Jenkins Jon Michael
Peters Dan J.
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