Vortex instabilities triggered by low-mass planets in pebble-rich, inviscid protoplanetary discs
hal.structure.identifier | ECLIPSE 2019 | |
dc.contributor.author | PIERENS, A. | |
dc.contributor.author | LIN, Min-Kai | |
hal.structure.identifier | ECLIPSE 2019 | |
dc.contributor.author | RAYMOND, Sean N. | |
dc.date.issued | 2019 | |
dc.identifier.issn | 0035-8711 | |
dc.description.abstractEn | In the innermost regions of protoplanerary discs, the solid-to-gas ratio can be increased considerably by a number of processes, including photoevaporative and particle drift. MHD disc models also suggest the existence of a dead-zone at $R\lesssim 10$ AU, where the regions close to the midplane remain laminar. In this context, we use two-fluid hydrodynamical simulations to study the interaction between a low-mass planet ($\sim 1.7 \;{\rm M_\oplus}$) on a fixed orbit and an inviscid pebble-rich disc with solid-to-gas ratio $\epsilon\ge 0.5$. For pebbles with Stokes numbers St=0.1, 0.5, multiple dusty vortices are formed through the Rossby Wave Instability at the planet separatrix. Effects due to gas drag then lead to a strong enhancement in the solid-to-gas ratio, which can increase by a factor of $\sim 10^3$ for marginally coupled particles with St=0.5. As in streaming instabilities, pebble clumps reorganize into filaments that may plausibly collapse to form planetesimals. When the planet is allowed to migrate in a MMSN disc, the vortex instability is delayed due to migration but sets in once inward migration stops due a strong positive pebble torque. Again, particle filaments evolving in a gap are formed in the disc while the planet undergoes an episode of outward migration. Our results suggest that vortex instabilities triggered by low-mass planets could play an important role in forming planetesimals in pebble-rich, inviscid discs, and may significantly modify the migration of low-mass planets. They also imply that planetary dust gaps may not necessarily contain planets if these migrated away. | |
dc.language.iso | en | |
dc.publisher | Oxford University Press (OUP): Policy P - Oxford Open Option A | |
dc.subject.en | Astrophysics - Earth and Planetary Astrophysics | |
dc.title.en | Vortex instabilities triggered by low-mass planets in pebble-rich, inviscid protoplanetary discs | |
dc.type | Article de revue | |
dc.identifier.doi | 10.1093/mnras/stz1718 | |
dc.subject.hal | Planète et Univers [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP] | |
bordeaux.journal | Monthly Notices of the Royal Astronomical Society | |
bordeaux.page | 645-659 | |
bordeaux.volume | 488 | |
bordeaux.issue | 1 | |
bordeaux.peerReviewed | oui | |
hal.identifier | hal-02161840 | |
hal.version | 1 | |
hal.popular | non | |
hal.audience | Internationale | |
hal.origin.link | https://hal.archives-ouvertes.fr//hal-02161840v1 | |
bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Monthly%20Notices%20of%20the%20Royal%20Astronomical%20Society&rft.date=2019&rft.volume=488&rft.issue=1&rft.spage=645-659&rft.epage=645-659&rft.eissn=0035-8711&rft.issn=0035-8711&rft.au=PIERENS,%20A.&LIN,%20Min-Kai&RAYMOND,%20Sean%20N.&rft.genre=article |
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