Windows through the dusty disks surrounding the youngest low-mass protostellar objects

The formation and evolution of young Low-mass stars are characterized by im portant processes of mass Loss and accretion occurring in the innermost reg ions of their placentary circumstellar disks. Because of the Large obscurat ion of these disks at optical and infrared wavelengths in the early protost ellar stages (class 0 sources), they were previously detected only at radio wavelengths using interferometric techniques. We have detected with the In frared Space Observatory the mid-infrared (mid-IR) emission associated with the class 0 protostar VLA1 in the HH1-HH2 region located in the Orion nebu la. The emission arises in three wavelength windows (at 5.3, 6.6, and 7.5 m icrometers) where the absorption due to ices and silicates has a local mini mum that exposes the central part of the young protostellar system to mid-I R investigations. The mid-IR emission arises from a central source with a d iameter of 4 astronomical units at an averaged temperature of similar to 70 0 K, deeply embedded in a dense region with a visual extinction of 80 to 10 0 magnitudes.