Other
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.1007c&link_type=abstract
American Astronomical Society, DPS meeting #38, #10.07; Bulletin of the American Astronomical Society, Vol. 38, p.494
Other
Scientific paper
The NASA Kepler Mission, scheduled for launch in 2008, will search for Earth-size planets orbiting Sun-like stars in or near habitable zones. A high precision photometer will search for planetary transits of parent stars. For a system similar to the Earth-Sun, the decrease in light during a central transit will be one part in 10,000 of the total stellar brightness out of transit. This poster discusses the effort to address a significant concern: the possibility of false positive detections of extra-solar Earth analogs. The concern arises because about 50 per cent of star systems are double or multiple. Further, because the photometer design is constrained by the requirement for high sensitivity to changes of low light levels, the optical resolution is not high compared to other space or terrestrial telescopes. If a relatively nearby Kepler target star happens to contain, within the Kepler PSF, an eclipsing binary system that is reduced in brightness by a factor of 10,000, say because it is 100 times farther away, the photometric profile of an eclipse could mimic a planetary transit. We have therefore developed a program to use archival data from the Hubble Space Telescope to quantify the number density of faint stars in the Kepler field that are in the brightness range that could cause confusion. Since the beginning of the project, the location of the Kepler field itself has been changed to optimize observing efficiency. The work originally included HST/WFPC2 data, and has now been expanded to ACS data as well. We present here a summary of completed and continuing work on faint background systems in the new Kepler field.
Borucki William. J.
Caldwell J. Jr. J.
Ouvarova T.
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