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Dust drifting inward in protoplanetary disks is subject to increasingtemperatures. In laboratory experiments, we tempered basaltic dust between 873K and 1273 K and find that the dust grains change in size and composition.These modifications influence the outcome of self-consistent low speedaggregation experiments showing a transition temperature of 1000\,K. Dusttempered at lower temperatures grows to a maximum aggregate size of $2.02 \pm0.06$ mm, which is $1.49 \pm 0.08$ times the value for dust tempered at highertemperatures. A similar size ratio of $1.75 \pm 0.16$ results for a differentset of collision velocities. This transition temperature is in agreement withorbit temperatures deduced for observed extrasolar planets. Most terrestrialplanets are observed at positions equivalent to less than 1000 K. Dustaggregation on the millimeter-scale at elevated temperatures might therefore bea key factor for terrestrial planet formation.

Is There a Temperature Limit in Planet Formation at 1000 K?