Fig. 1
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Isochrones of a population of disks with t = 5 Myr for three values of M0 in the MD − Ṁ* plane. The colored dots are Monte Carlo simulations of 105 proto-planetary disks evolving following Eqs. (4), (5) with ω = 0.8, where tacc,0 follows a lognormal distribution centered on the natural logarithm of 1 Myr with a spread of 0.26 dex, while M0 = 0.1, 1.0, 10 M⊙.
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