Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 459, Issue 1, Pages L1-L5Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnrasl/slw032
Keywords
planet-disc interactions; protoplanetary discs; dust, extinction; submillimetre: planetary systems
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Funding
- PRIN MIUR [prot. 2010LY5N2T]
- ERC FP7 grant ECOGAL
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We identify two distinct physical mechanisms for dust gap opening by embedded planets in protoplanetary discs based on the symmetry of the drag-induced motion around the planet: (I) a mechanism where low-mass planets, that do not disturb the gas, open gaps in dust by tidal torques assisted by drag in the inner disc, but resisted by drag in the outer disc; and (II) the usual, drag-assisted, mechanism where higher mass planets create pressure maxima in the gas disc, which the drag torque then acts to evacuate further in the dust. The first mechanism produces gaps in dust but not gas, while the second produces partial or total gas gaps which are deeper in the dust phase. Dust gaps do not necessarily indicate gas gaps.
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