36,355 research outputs found
Formation and tidal evolution of hot super-Earths in multiple planetary systems
Hot super-Earths are exoplanets with masses < 10 Earth masses and orbital
periods < 20 days. Around 8 hot super-Earths have been discovered in the
neighborhood of solar system. In this lecture, we review the mechanisms for the
formation of hot super-Earths, dynamical effects that play important roles in
sculpting the architecture of the multiple planetary systems. Two example
systems (HD 40307 and GJ 436) are presented to show the formation and evolution
of hot super-Earths or Neptunes.Comment: 12 pages, 4 color figures, Lecture in 'Extrasolar planets in
Multi-Body systems: Theory and Observation',Torun (Poland), August 25-29,
2008, to appear in European Astronomical Society Publication Serie
On Relaxed Averaged Alternating Reflections (RAAR) Algorithm for Phase Retrieval from Structured Illuminations
In this paper, as opposed to the random phase masks, the structured
illuminations with a pixel-dependent deterministic phase shift are considered
to derandomize the model setup. The RAAR algorithm is modified to adapt to two
or more diffraction patterns, and the modified RAAR algorithm operates in
Fourier domain rather than space domain. The local convergence of the RAAR
algorithm is proved by some eigenvalue analysis. Numerical simulations is
presented to demonstrate the effectiveness and stability of the algorithm
compared to the HIO (Hybrid Input-Output) method. The numerical performances
show the global convergence of the RAAR in our tests.Comment: 17 pages, 26 figures, submitting to Inverse Problem
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