Magnetar 4U 0142+61 from IR to hard X-rays

Spitzer observations of the 8.7 s magnetar 4U 0142+61 showed a broad infrared (IR) excess which was interpreted as a possible supernova fallback disk around the magnetar. Such disks have been predicted by dynamic supernova models, yet conclusive observational evidence of their existence is still lacking. To further elucidate the nature of the IR excess of 4U 0142+61, we carried out a multifaceted observing campaign using JWST’s MIRI and NIRCam complemented by contemporaneous X-ray observations with NICER, Swift, and NuSTAR. The obtained data characterize the SED and pulsations of the magnetar across a wide range of frequencies from IR to X-rays. We will report the results of these observations and discuss their implications for the physical mechanism responsible for the IR emission.