Two mechanisms for dust gap opening in protoplanetary discs
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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.
Dipierro , G , Laibe , G , Price , D J & Lodato , G 2016 , ' Two mechanisms for dust gap opening in protoplanetary discs ' Monthly Notices of the Royal Astronomical Society: Letters , vol 459 , no. 1 , pp. L1-L5 . DOI: 10.1093/mnrasl/slw032
Monthly Notices of the Royal Astronomical Society: Letters
© 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. This work is made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at: https://dx.doi.org/10.1093/mnrasl/slw032
We acknowledge an ARC Future Fellowship and Discovery Project. GD and G. Lodato acknowledge funding via PRINMIUR prot. 2010LY5N2T. G. Laibe is funded by ERC FP7 grant ECOGAL.