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11 papers · 1 filter
The Mutual Orbit, Mass, and Density of the Large Transneptunian Binary System Varda and Ilmarë
W. M. Grundy, S. B. Porter, S. D. Benecchi +7
From observations by the Hubble Space Telescope, Keck II Telescope, and Gemini North Telescope, we have determined the mutual orbit of the large transneptunian object (174567) Vard…
The Stellar Spectral Features of Nearby Galaxies in the Near-Infrared: Tracers of Thermally-Pulsing Asymptotic Giant Branch Stars?
Rogério Riffel, Rachel E. Mason, Lucimara P. Martins +12
We analyze the stellar absorption features in high signal-to-noise ratio near-infrared (NIR) spectra of the nuclear region of 12 nearby galaxies, mostly spirals. The features detec…
The Mass-Luminosity Relation in the L/T Transition: Individual Dynamical Masses for the New J-Band Flux Reversal Binary SDSSJ105213.51+442255.7AB
Trent J. Dupuy, Michael C. Liu, S. K. Leggett +3
We have discovered that SDSSJ105213.51+442255.7 (T0.51.0) is a binary in Keck laser guide star adaptive optics imaging, displaying a large J-to-K-band flux reversal (J = -0…
Methane and Ammonia in the near-infrared spectra of late T dwarfs
J. I. Canty, P. W. Lucas, Sergei N. Yurchenko +7
Analysis of T dwarfs using model atmospheres has been hampered by the absence of reliable line lists for methane and ammonia. Newly computed high temperature line lists for both of…
The Brightening of Re50N: Accretion Event or Dust Clearing?
Hsin-Fang Chiang, Bo Reipurth, Josh Walawender +5
The luminous Class I protostar HBC 494, embedded in the Orion A cloud, is associated with a pair of reflection nebulae, Re50 and Re50N, which appeared sometime between 1955 and 197…
The Nuclear Near-Infrared Spectral Properties of Nearby Galaxies
R. E. Mason, A. Rodriguez-Ardila, L. Martins +15
We present spectra of the nuclear regions of 50 nearby (D = 1 - 92 Mpc, median = 20 Mpc) galaxies of morphological types E to Sm. The spectra, obtained with the Gemini Near-IR Spec…