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Single Fluid vs. Multifluid: Comparison between single fluid and multifluid dust models for disc planet interactions
Kevin Chan, Sijme-Jan Paardekooper
Recent observations of substructures such as dust gaps and dust rings in protoplanetary discs have highlighted the importance of including dust into purely gaseous disc models. At…
Dynamics of Dusty Vortices II: Stability of 2D dust laden vortices
Francesco Lovascio, Sijme-Jan Paardekooper, Colin McNally
Vortices have long been speculated to play a role in planet formation, via the collection of dust in the pressure maxima that arise at the cores of vortices in protoplanetary discs…
Planet-Disk Interactions
Sijme-Jan Paardekooper, Ruobing Dong, Paul Duffell +4
Planet-disk interactions, where an embedded massive body interacts gravitationally with the protoplanetary disk it was formed in, can play an important role in reshaping both the d…
Polydisperse Streaming Instability II. Methods for solving the linear stability problem
Sijme-Jan Paardekooper, Colin P. McNally, Francesco Lovascio
Occurring in protoplanetary discs composed of dust and gas, streaming instabilities are a favoured mechanism to drive the formation of planetesimals. The Polydispserse Streaming In…
Polydisperse Streaming Instability III. Dust evolution encourages fast instability
Colin P. McNally, Francesco Lovascio, Sijme-Jan Paardekooper
Planet formation via core accretion requires the production of km-sized planetesimals from cosmic dust. This process must overcome barriers to simple collisional growth, for which…
Polydisperse Streaming Instability I. Tightly coupled particles and the terminal velocity approximation
Sijme-Jan Paardekooper, Colin P. McNally, Francesco Lovascio
We introduce a polydisperse version of the streaming instability, where the dust component is treated as a continuum of sizes. We show that its behaviour is remarkably different fr…
Low-mass planet migration in three dimensional wind-driven inviscid discs: a negative corotation torque
Colin P. McNally, Richard P. Nelson, Sijme-Jan Paardekooper +2
We present simulations of low-mass planet--disc interactions in inviscid three-dimensional discs. We show that a wind-driven laminar accretion flow through the surface layers of th…
Constraining the masses of planets in protoplanetary discs from the presence or absence of vortices -- Comparison with ALMA observations
Paul Hallam, Sijme-Jan Paardekooper
A massive planet in a protoplanetary disc will open a gap in the disc material. A steep gap edge can be hydrodynamically unstable, which results in the formation of vortices that c…
Dynamics of Dusty Vortices I: Extensions and limitations of the terminal velocity approximation
Francesco Lovascio, Sijme-Jan Paardekooper
Motivated by the stability of dust laden vortices, in this paper we study the terminal velocity approximation equations for a gas coupled to a pressureless dust fluid and present a…
Multiplanet systems in inviscid discs can avoid forming resonant chains
Colin P. McNally, Richard P. Nelson, Sijme-Jan Paardekooper
Convergent migration involving multiple planets embedded in a viscous protoplanetary disc is expected to produce a chain of planets in mean motion resonances, but the multiplanet s…
Migrating super-Earths in low-viscosity discs: unveiling the roles of feedback, vortices, and laminar accretion flows
Colin P. McNally, Richard P. Nelson, Sijme-Jan Paardekooper +1
We present the highest resolution study to date of super-Earths migrating in inviscid and low-viscosity discs, motivated by the connection to laminar, wind-driven models of protopl…
Investigating the possibility of reversing giant planet migration via gap edge illumination
P. D. Hallam, S. -J. Paardekooper
A massive planet in a protoplanetary disc will open a gap in the disc material which acts as a transition between Type I and Type II planetary migration. Type II migration is slowe…
Low mass planet migration in Hall-affected disks
Colin P. McNally, Richard P. Nelson, Sijme-Jan Paardekooper +2
Recent developments in non-ideal magnetohydrodynamic simulations of protoplanetary disks suggest that instead of being traditional turbulent (viscous) accretion disks, they have a…
Low mass planet migration in magnetically torqued dead zones - II. Flow-locked and runaway migration, and a torque prescription
Colin P. McNally, Richard P. Nelson, Sijme-Jan Paardekooper
We examine the migration of low mass planets in laminar protoplanetary discs, threaded by large scale magnetic fields in the dead zone that drive radial gas flows. As shown in Pape…
Low mass planet migration in magnetically torqued dead zones - I. Static migration torque
Colin P. McNally, Richard P. Nelson, Sijme-Jan Paardekooper +2
Motivated by models suggesting that the inner planet forming regions of protoplanetary discs are predominantly lacking in viscosity-inducing turbulence, and are possibly threaded b…
Gravito-turbulence and the excitation of small-scale parametric instability in astrophysical discs
A. Riols, H. Latter, S-J. Paardekooper
Young protoplanetary discs and the outer radii of active galactic nucleii may be subject to gravitational instability and, as a consequence, fall into a `gravitoturbulent' state. W…
The role of gap edge instabilities in setting the depth of planet gaps in protoplanetary discs
Paul Hallam, Sijme-Jan Paardekooper
It is known that an embedded massive planet will open a gap in a protoplanetary disc via angular momentum exchange with the disc material. The resulting surface density profile of…
A terrestrial planet candidate in a temperate orbit around Proxima Centauri
Guillem Anglada-Escudé, Pedro J. Amado, John Barnes +28
At a distance of 1.295 parsecs, the red-dwarf Proxima Centauri ( Centauri C, GL 551, HIP 70890, or simply Proxima) is the Sun's closest stellar neighbor and one of the best stud…
Exploring plausible formation scenarios for the planet candidate orbiting Proxima Centauri
Gavin A. L. Coleman, Richard P. Nelson, Sijme-Jan Paardekooper +3
We present a study of four different formation scenarios that may be able to explain the origin of the recently announced planet (`Proxima b') orbiting Proxima Centauri. The aim is…
Dynamical corotation torques on low-mass planets
Sijme-Jan Paardekooper
We study torques on migrating low-mass planets in locally isothermal discs. Previous work on low-mass planets generally kept the planet on a fixed orbit, after which the torque on…
Planet-Disc Interactions and Early Evolution of Planetary Systems
Clément Baruteau, Aurélien Crida, Sijme-Jan Paardekooper +6
The great diversity of extrasolar planetary systems has challenged our understanding of how planets form, and how their orbits evolve as they form. Among the various processes that…
Planet or Brown Dwarf? Inferring the Companion Mass in HD 100546 from the Wall Shape using Mid-Infrared Interferometry
Gijs D. Mulders, Sijme-Jan Paardekooper, Olja Panić +3
Giant planets form in protoplanetary disks while these disks are still gas-rich, and can reveal their presence through the annular gaps they carve out. HD 100546 is a gas-rich disk…
The formation of systems with closely spaced low-mass planets and the application to Kepler-36
Sijme-Jan Paardekooper, Hanno Rein, Willy Kley
The Kepler-36 system consists of two planets that are spaced unusually close together, near the 7:6 mean motion resonance. While it is known that mean motion resonances can easily…
How not to build Tatooine: the difficulty of in situ formation of circumbinary planets Kepler 16b, Kepler 34b and Kepler 35b
Sijme-Jan Paardekooper, Zoe M. Leinhardt, Philippe Thebault +1
We study planetesimal evolution in circumbinary disks, focusing on the three systems Kepler 16, 34 and 35 where planets have been discovered recently. We show that for circumbinary…