The GJ 504 system revisited

Li IN THE ATMOSPHERE OF GJ 117 REVISITED

Detection of Li has been shown for energetic solar events, one chromospherically active binary, and several dwarf halo stars. We had previously found a Li /7Li 1⁄4 0:03 0:01 for active K dwarf GJ 117 using VLT UVES observations. Here we present high signal-to-noise (>1000) high spectral resolution observations taken with theMcDonald Observatory’s 2.7 m and echelle spectrometer of GJ 117. We hav...

Modeling the resonant planetary system GJ 876

The two planets about the star GJ 876 appear to have undergone extensive migration from their point of origin in the protoplanetary disk — both because of their close proximity to the star (30 and 60 day orbital periods) and because of their occupying three stable orbital resonances at the 2:1 mean-motion commensurability. The resonances were most likely established by converging differential m...

Precision Masses of the Low - Mass Binary System Gj 623

We have used Aperture Masking Interferometry and Adaptive Optics (AO) at the Palomar 200” to obtain precise mass measurements of the binary M dwarf GJ 623. AO observations spread over 3 years combined with a decade of radial velocity measurements constrain all orbital parameters of the GJ 623 binary system accurately enough to critically challenge the models. The dynamical masses measured are m...

The Chen System Revisited

This note points out that the assertions of [“Chen’s attractor exists if Lorenz repulsor exists: The Chen system is a special case of the Lorenz system,” CHAOS 23, 033108 (2013)] are groundless and incorrect. The failure of that criticism actually supports the strong standing of the Chen system.

GJ Jeon