Over the years, further infrared observations and more refined models have suggested that the simple "flat" structure of protoplanetary disks may need to be revisited. Revised theoretical models included a modification of the ‘classic' protoplanetary disk, adding a halo of dusty material encapsulating the young, hot star. By doing this, more dust is heated than the disk scenario and could perhaps explain the excess in infrared radiation.
PHOTOS: Cosmic Hotshots from Keck Observatory
However, with the help of Spitzer and new 3-D models, astronomers think they have a more refined answer.
As the star-forming cloud collapses, the new star not only retains the angular momentum of the spinning cloud, it also collapses any magnetic fields contained within it. The magnetic field will thread through the protoplanetary disk creating huge loops, trapping gas, dust and plasma, enhancing the disk's atmosphere. These huge arcs - like the bright coronal loops that are filled with hot plasma reaching high above the sun's photosphere - could be what is responsible for the excess; starlight is blocked by the huge arcs, which are then heated to generate more infrared radiation.