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114 papers · 1 filter
Linking dwarf galaxies to halo building blocks with the most metal-poor star in Sculptor
Anna Frebel, Evan Kirby, Joshua D. Simon
Current cosmological models indicate that the Milky Way's stellar halo was assembled from many smaller systems. Based on the apparent absence of the most metal-poor stars in presen…
Elastic isotropy of hcp-Fe under Earth core conditions
Xianwei Sha, R. E. Cohen
Our first-principles calculations show that both the compressional and shear waves of hcp-Fe become elastically isotropic under the high temperatures of Earth inner core conditions…
Temperature and Pressure Dependence of the Fe-specific Phonon Density of States in Ba(Fe(1-x)Co(x))2As2
O. Delaire, M. S. Lucas, A. M. dos Santos +15
The {57}Fe-specific phonon density of states of Ba(Fe(1-x)Co(x))2As2 single crystals (x=0.0, 0.08) was measured at cryogenic temperatures and at high pressures with nuclear-resonan…
Evidence of a massive planet candidate orbiting the young active K5V star BD+20 1790
M. Hernán-Obispo, M. C. Gálvez-Ortiz, G. Anglada-Escudé +4
BD+20 1790 is a young active, metal-rich, late-type K5Ve star. We have undertaken a study of stellar activity and kinematics for this star over the past few years. Previous results…
A long-period planet orbiting a nearby Sun-like star
Hugh R. A. Jones, R. Paul Butler, C. G. Tinney +10
The Doppler wobble induced by the extra-solar planet HD 134987b was first detected by data from the Keck Telescope nearly a decade ago, and was subsequently confirmed by data from…
A Super-Earth and two Neptunes Orbiting the Nearby Sun-like star 61 Virginis
Steven S. Vogt, Robert A. Wittenmyer, R. Paul Butler +10
We present precision radial velocity (RV) data that reveal a multiple exoplanet system orbiting the bright nearby G5V star 61 Virginis. Our 4.6 years of combined Keck/HIRES and Ang…