TrES-3b may have been detected in the infrared. Here's an exerpt from the extrasolar planets encyclopaedia bibliography. I've started to lose track of what planets have, and haven't been detected in infrared, so if this is old news, I apoplogize
DE MOOIJ E. & SNELLEN I. , 2008 (update : 05 December 2008)
Ground-based K-band detection of thermal emission from the exoplanet TrES-3b
Astron. & Astrophys. , - , -
accepted
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