Follow-up Observations of Transiting Exoplanets with High-Precision Narrow-band Photometry

Details Follow-up Observations of Transiting Exoplanets with High-Precision Narrow-band Photometry Follow-up Observations of Transiting Exoplanets with High-Precision Narrow-band Photometry

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21420103f&link_type=abstract

American Astronomical Society, AAS Meeting #214, #201.03; Bulletin of the American Astronomical Society, Vol. 41, p.709

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Ground and space-based exoplanet searches have already discovered several Neptune-size planets and are rapidly closing in on ``Super-Earths'' and ultimately Earth-like planets. For planets that transit their host stars, follow-up photometric observations enable the characterization of the planet's physical and orbital properties. Traditionally, ground-based photometry is performed using broad-band filters to maximize throughput and minimize photon noise. For high-precision ground-based photometry, other sources of noise become significant, such as scintillation noise, flat-fielding errors, atmospheric variability, differential extinction, and color differences between planet-host and reference stars. Each of these noise sources can be reduced by employing narrow-band photometry using large ground-based observatories. A large aperture reduces scintillation noise and provides sufficient photons, even for narrow-band photometry. The narrow bandpass reduces color terms that cause flat-fielding errors and differential extinction. Errors due to atmospheric variability can be minimized observing at near infrared wavelengths with minimal atmospheric absorption. We present a program for high-precision narrow-band photometric transit follow-up observations using the Gran Telescopio Canarias (GTC) with OSIRIS. OSIRIS is one of two first light instruments for the GTC and features a tunable filter imaging mode that is well suited for narrow-band photometry. We will describe the exciting prospects for narrow-band photometric studies of transiting exoplanets, as well as the accompanying challenges. We anticipate presenting a preliminary analysis of science verification observations.

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