Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.5905c&link_type=abstract
American Astronomical Society, DPS meeting #42, #59.05; Bulletin of the American Astronomical Society, Vol. 42, p.1085
Astronomy and Astrophysics
Astronomy
Scientific paper
After a possible transit-like signal is detected in a Kepler lightcurve, a large number of checks are made in order to determine whether the signal is due to a true planet or is a false-positive signal. The first steps include detailed inspection of the lightcurve itself and a search for correlation of astrometric residuals with the photometric transit signal. Kepler Objects of Interest (KOIs) that are passed on to the Follow-up Observing Program then receive reconnaissance spectroscopy and high spatial resolution imaging. KOIs that survive these tests may then be subjected to high-precision radial velocity measurements to measure the stellar reflex orbit and thus fully confirm the existence of a planet. This last step of precise radial velocity measurement can not be used on all Kepler planets because: 1) telescope resources are limited, and 2) state-of-the-art velocity precision is insufficient to measure the stellar reflex orbit of an Earth-mass planet in a 1AU orbit around the faint Kepler targets. Examples of these verification steps will be presented.
Cochran William D.
Kepler Science Team
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