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We present new results from a multi-wavelength (radio/infrared/optical/X-ray)study of the black hole X-ray binary GRO J1655-40 during its 2005 outburst. Wedetected, for the first time, mid-infrared emission at 24 um from the compactjet of a black hole X-ray binary during its hard state, when the source showsemission from a radio compact jet as well as a strong non-thermal hard X-raycomponent. These detections strongly constrain the optically thick part of thesynchrotron spectrum of the compact jet, which is consistent with being flatover four orders of magnitude in frequency. Moreover, using this unprecedentedcoverage, and especially thanks to the new Spitzer observations, we can testbroadband disk and jet models during the hard state. Two of the hard statebroadband spectra are reasonably well fitted using a jet model with parametersoverall similar to those previously found for Cyg X-1 and GX 339-4. Differencesare also present; most notably, the jet power in GRO J1655-40 appears to be afactor of at least ~3-5 higher (depending on the distance) than that of Cyg X-1and GX 339-4 at comparable disk luminosities. Furthermore, a few discrepanciesbetween the model and the data, previously not found for the other two blackhole systems for which there was no mid-IR/IR and optical coverage, areevident, and will help to constrain and refine theoretical models.

Tracing the jet contribution to the mid-IR over the 2005 outburst of GRO J1655-40 via broadband spectral modeling