Author pages are created from data sourced from our academic publisher partnerships and public sources.
- Publications
- Influence
STREAMING INSTABILITIES IN PROTOPLANETARY DISKS
- A. Youdin, J. Goodman
- Physics
- 10 September 2004
Interpenetrating streams of solids and gas in a Keplerian disk produce a local, linear instability. The two components mutually interact via aerodynamic drag, which generates radial drift and… Expand
Rapid planetesimal formation in turbulent circumstellar disks
- A. Johansen, J. Oishi, M. Low, H. Klahr, T. Henning, A. Youdin
- Physics, Medicine
- Nature
- 29 August 2007
During the initial stages of planet formation in circumstellar gas disks, dust grains collide and build up larger and larger bodies. How this process continues from metre-sized boulders to… Expand
Particle Stirring in Turbulent Gas Disks: Including Orbital Oscillations
- A. Youdin, Y. Lithwick
- Physics
- 19 July 2007
We describe the diusion and random velocities of solid particles due to stochastic forcing by turbulent gas. We include the orbital dynamics of Keplerian disks, both in-plane epicycles and vertical… Expand
The Exoplanet Census: A General Method Applied to Kepler
- A. Youdin
- Physics
- 9 May 2011
We develop a general method to fit the planetary distribution function (PLDF) to exoplanet survey data. This maximum likelihood method accommodates more than one planet per star and any number of… Expand
PLANETESIMAL FORMATION BY GRAVITATIONAL INSTABILITY
We investigate the formation of planetesimals via the gravitational instability of solids that have settled to the midplane of a circumstellar disk. Vertical shear between the gas and a subdisk of… Expand
Particle Clumping and Planetesimal Formation Depend Strongly on Metallicity
- A. Johansen, A. Youdin, Mordecai-Mark Mac Low Leiden Observatory, L. University, Cita, Amnh
- Physics
- 1 September 2009
We present three-dimensional numerical simulations of particle clumping and planetesimal formation in protoplanetary disks with varying amounts of solid material. As centimeter-size pebbles settle to… Expand
FORMATION OF KUIPER BELT BINARIES BY GRAVITATIONAL COLLAPSE
- D. Nesvorný, A. Youdin, D. C. Richardson
- Physics
- 8 July 2010
A large fraction of ~100 km class low-inclination objects in the classical Kuiper Belt (KB) are binaries with comparable masses and a wide separation of components. A favored model for their… Expand
Forming Planetesimals in Solar and Extrasolar Nebulae
Planets are built from planetesimals: solids larger than a kilometer that grow by colliding in pairs. Planetesimals themselves are unlikely to form by twobody collisions alone; subkilometer objects… Expand
Zonal Flows and Long-lived Axisymmetric Pressure Bumps in Magnetorotational Turbulence
- A. Johansen, A. Youdin, Hubert Klahr Leiden Observatory, L. University, Cita, Mpia
- Physics
- 24 November 2008
We study the behavior of magnetorotational turbulence in shearing box simulations with a radial and azimuthal extent up to 10 scale heights. Maxwell and Reynolds stresses are found to increase by… Expand
Protoplanetary Disk Turbulence Driven by the Streaming Instability: Linear Evolution and Numerical Methods
- A. Youdin, Anders Johansen Princeton University Observatory, M. Heidelberg, Cita
- Physics
- 23 February 2007
We present local simulations that verify the linear streaming instability that arises from aerodynamic coupling between solids and gas in protoplanetary disks. This robust instability creates… Expand