We report the discovery of a dwarf protoplanetary disk around the star XZ Tau B that shows all the features of a classical transitional disk but on a much smaller scale. The disk has been imaged with the Atacama Large Millimeter/Submillimeter Array (ALMA), revealing that its dust emission has a quite small radius of ~ 3.4 au and presents a central cavity of ~ 1.3 au in radius that we attribute to clearing by a compact system of orbiting (proto)planets. Given the very small radii involved, evolution is expected to be much faster in this disk (observable changes in a few months) than in classical disks (observable changes requiring decades) and easy to monitor with observations in the near future. From our modeling we estimate that the mass of the disk is large enough to form a compact planetary system.
@article{arxiv.1606.03118,
title = {A Dwarf Protoplanetary Disk around XZ Tau B},
author = {Mayra Osorio and Enrique Macias and Guillem Anglada and Carlos Carrasco-Gonzalez and Roberto Galvan-Madrid and Luis Zapata and Nuria Calvet and Jose F. Gomez and Erick Nagel and Luis F. Rodriguez and Jose M. Torrelles and Zhaohuan Zhu},
journal= {arXiv preprint arXiv:1606.03118},
year = {2016}
}