K-band transit and secondary eclipse photometry of exoplanet OGLE-TR-113b

Abstract

We present high precision K-band photometry of the transit and secondary eclipse of extrasolar planet OGLE-TR-113, using the SOFI near-infrared instrument on ESO's NTT. Data were taken in 5 second exposures over two periods of 3-4 hours, using random jitter position offsets. In this way, a relative photometric precision of ~1% per frame was achieved, avoiding systematic effects that seem to become dominant at precisions exceeding this level, and resulting in an overall accuracy of 0.1% per ~10 minutes. The observations of the transit show a flat bottom light-curve indicative of a significantly lower stellar limb-darkening at near-infrared than at optical wavelengths. The observations of the secondary eclipse result in a 3 sigma detection of emission from the exoplanet at 0.17+-0.05%. However, residual systematic errors make this detection rather tentative.

6 pages, 7 figures: MNRAS accepted

References in corpus (4)

• Detection of Thermal Emission from an Extrasolar Planet
• Strong Infrared Emission from the Extrasolar Planet HD189733b
• High accuracy transit photometry of the planet OGLE-TR-113b with a new deconvolution-based method
• A Spitzer Infrared Radius for the Transiting Extrasolar Planet HD209458b

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