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The evidence of a relation between the mass accretion rate and the disk massis established for young, Class II pre-main sequence stars. This observationalresult opened an avenue to test theoretical models and constrain the initialconditions of the disk formation, fundamental in the understanding of theemergence of planetary systems. However, it is becoming clear that the planetformation starts even before the Class II stage, in disks around Class 0 and Iprotostars. We show for the first time evidence for a correlation between themass accretion rate and the disk mass for a large sample of Class I young starslocated in nearby (< 500 pc) star-forming regions. We fit our sample, findingthat the Class I objects relation has a slope flatter than Class II stars, andhave higher mass accretion rates and disk masses. The results are put incontext of the disk evolution models.

The relation between the Mass Accretion Rate and the Disk Mass in Class I Protostars