Binning is sinning: morphological light-curve distortions due to finite integration time - Astrophysics > Earth and Planetary AstrophysicsReportar como inadecuado




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Abstract: We explore how finite integration times or equivalently temporal binninginduces morphological distortions to the transit light-curve. Thesedistortions, if uncorrected for, lead to the retrieval of erroneous systemparameters and may even lead to some planetary candidates being rejected asostensibly unphysical. We provide analytic expressions for estimating thedisturbance to the various light-curve parameters as a function of theintegration time. These effects are particularly crucial in light of thelong-cadence photometry often used for discovering new exoplanets by, forexample, Convection Rotation and Planetary Transits COROT and the KeplerMission 8.5 and 30 min. One of the dominant effects of long integration timesis a systematic underestimation of the light-curve-derived stellar density,which has significant ramifications for transit surveys. We present adiscussion of numerical integration techniques to compensate for the effectsand produce expressions to quickly estimate the errors of such techniques, as afunction of integration time and numerical resolution. This allows for aneconomic choice of resolution before attempting fits of long-cadencelight-curves. We provide a comparison of the short- and long-cadencelight-curves of TrES-2b and show that the retrieved transit parameters areconsistent using the techniques discussed here.



Autor: David M. Kipping

Fuente: https://arxiv.org/







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