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69 papers · 1 filter
Annealing of Silicate Dust by Nebular Shocks at 10 AU
David E. Harker, Steven J. Desch
Silicate dust grains in the interstellar medium are known to be mostly amorphous, yet crystalline silicate grains have been observed in many long-period comets and in protoplanetar…
Rapid Formation of Ice Giant Planets
Alan P. Boss, George W. Wetherill, Nader Haghighipour
The existence of Uranus and Neptune presents severe difficulties for the core accretion model for the formation of ice giant planets. We suggest an alternative mechanism, namely di…
An HST Census of Nuclear Star Clusters in Late-Type Spiral Galaxies: I. Observations and Image Analysis
Torsten Boeker, Seppo Laine, Roeland P. van der Marel +4
We present new HST I-band images of a sample of 77 nearby, late-type spiral galaxies with low inclination. The main purpose of this catalog is to study the frequency and properties…
A probable planetary companion to HD 39091 from the Anglo-Australian Planet Search
Hugh R. A. Jones, R. Paul Butler, C. G. Tinney +5
We report the detection of a extrasolar planet candidate orbiting the G1 V star HD 39091. The orbital period is 2083 d and the eccentricity is 0.62. With a minimum (M sin ) mass…
Radial Velocities for 889 Late-type Stars
David L. Nidever, Geoffrey W. Marcy, R. Paul Butler +2
We report radial velocities for 844 FGKM-type main sequence and subgiant stars and 45 K giants, most of which had either low-precision velocity measurements or none at all. These v…
Evidence of local magnetic order in hcp iron from Raman mode splitting
Gerd Steinle-Neumann, Lars Stixrude, R. E. Cohen +1
Experimental measurements of Raman spectra for hcp iron at high pressure show two modes over a considerable pressure range in contrast to the prediction of one doubly degenerate mo…