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Particle Stirring in Turbulent Gas Disks: Including Orbital Oscillations
- A. Youdin, Y. Lithwick
- Physics
- 19 July 2007
Lower Limits on Lorentz Factors in Gamma-Ray Bursts
- Y. Lithwick, R. Sari
- Physics
- 28 November 2000
As is well known, the requirement that gamma-ray bursts be optically thin to high-energy photons yields a lower limit on the Lorentz factor (γ) of the expansion. In this paper, we provide a simple…
Densities and Eccentricities of 139 Kepler Planets from Transit Time Variations
- S. Hadden, Y. Lithwick
- Geology, Physics
- 29 October 2013
We extract densities and eccentricities of 139 sub-Jovian planets by analyzing transit time variations (TTVs) obtained by the Kepler mission through Quarter 12. We partially circumvent the…
Secular Dynamics in Hierarchical Three-Body Systems
- S. Naoz, W. Farr, Y. Lithwick, F. Rasio, J. Teyssandier
- Physics, Geology
- 12 July 2011
The secular approximation for the evolution of hierarchical triple configurations has proven to be very useful in many astrophysical contexts, from planetary to triple-star systems. In this…
Compressible Magnetohydrodynamic Turbulence in Interstellar Plasmas
- Y. Lithwick, P. Goldreich
- Physics
- 22 June 2001
Radio wave scintillation observations reveal a nearly Kolmogorov spectrum of density fluctuations in the ionized interstellar medium. Although this density spectrum is suggestive of turbulence, no…
Planet formation by coagulation: A focus on Uranus and Neptune
- P. Goldreich, Y. Lithwick, R. Sari
- Geology, Physics
- 11 May 2004
Planets form in the circumstellar disks of young stars. We review the basic physical processes by which solid bodies accrete each other and alter each others' random velocities, and we provide…
EXTRACTING PLANET MASS AND ECCENTRICITY FROM TTV DATA
- Y. Lithwick, Ji-Wei Xie, Yanqin Wu
- Physics, Geology
- 17 July 2012
Most planet pairs in the Kepler data that have measured transit time variations (TTVs) are near first-order mean-motion resonances. We derive analytical formulae for their TTV signals. We separate…
The Intrinsic Size of Sagittarius A* from 0.35 to 6 cm
- G. Bower, W. Goss, H. Falcke, D. Backer, Y. Lithwick
- Physics
- 31 July 2006
We present new high-resolution observations of Sagittarius A* at wavelengths of 17.4-23.8 cm with the Very Large Array in the A configuration with the Pie Town Very Long Baseline Array (VLBA)…
DENSITY AND ECCENTRICITY OF KEPLER PLANETS
- Yanqin Wu, Y. Lithwick
- Physics, Geology
- 29 October 2012
We analyze the transit timing variations (TTV) obtained by the Kepler mission for 22 sub-Jovian planet pairs (19 published, 3 new) that lie close to mean motion resonances. We find that the TTV…
Final Stages of Planet Formation
- P. Goldreich, Y. Lithwick, R. Sari
- Geology, Physics
- 13 April 2004
We address three questions regarding solar system planets: What determined their number? Why are their orbits nearly circular and coplanar? How long did they take to form?
Runaway accretion in a…
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