We analyzed the warm Spitzer/IRAC data of KIC 8462852 .
We found no evidence of infrared excess at 3.6 µm and a small excess of 0.43 \pm 0.18 mJy at 4.5 µm , below the 3 \sigma threshold necessary to claim a detection .
The lack of strong infrared excess 2 years after the events responsible for the unusual light curve observed by Kepler , further disfavors the scenarios involving a catastrophic collision in a KIC 8462852 asteroid belt , a giant impact disrupting a planet in the system or a population of a dust-enshrouded planetesimals .
The scenario invoking the fragmentation of a family of comets on a highly elliptical orbit is instead consistent with the lack of strong infrared excess found by our analysis .