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The first steps of planet formation are marked by the growth andcrystallization of sub-micrometer-sized dust grains accompanied by dustsettling toward the disk midplane. In this paper we explore whether the firststeps of planet formation are affected by the presence of medium-separationstellar companions. We selected two large samples of disks around single andbinary T Tauri stars in Taurus that are thought to have only a modest agespread of a few Myr. The companions of our binary sample are at projectedseparations between 10 and 450 AU with masses down to about 0.1 solar masses.We used the strength and shape of the 10 micron silicate emission feature as aproxy for grain growth and for crystallization respectively. The degree of dustsettling was evaluated from the ratio of fluxes at two different mid-infraredwavelengths. We find no statistically significant difference between thedistribution of 10 micron silicate emission features from single and binarysystems. In addition, the distribution of disk flaring is indistinguishablebetween the single and binary system samples. These results show that the firststeps of planet formation are not affected by the presence of a companion attens of AU.

Medium-separation binaries do not affect the first steps of planet formation