A Minimum-Mass Extrasolar Nebula

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Abstract
By analogy with the minimum-mass solar nebula, we construct a surface-density profile using the orbits of the 26 precise-Doppler planets found in multiple planet systems: Sigma = 2200 grams per square centimeter (a/1 AU)^- beta, where a is the circumstellar radius, and beta = 2.0 plus or minus 0.5. The minimum-mass solar nebula (beta = 1.5) is consistent with this model, but the uniform-alpha accretion disk model (beta ~ 1) is not. In a nebula with beta > 2, the center of the disk is the likely cradle of planet formation.

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