Brown Dwarf Companions to G-Type Stars. I. Gliese 417B and Gliese 584C

@article{Kirkpatrick2001BrownDC,
  title={Brown Dwarf Companions to G-Type Stars. I. Gliese 417B and Gliese 584C},
  author={J. Davy Kirkpatrick and Conard C. Dahn and David G. Monet and I. Neill Reid and John E. Gizis and James William Liebert and Adam J. Burgasser},
  journal={The Astronomical Journal},
  year={2001},
  volume={121},
  pages={3235 - 3253}
}
We present astrometric and spectroscopic observations confirming that two nearby G dwarf systems (Gliese 417 = BD+36°2162 and Gliese 584AB = η CrB AB) have a widely separated, L dwarf, substellar companion. Using age estimates of the G dwarf primaries, we estimate masses for these L dwarfs from theoretical evolutionary tracks. For the L4.5 dwarf Gl 417B we estimate an age of 0.08–0.3 Gyr and a mass of 0.035 ± 0.015 M⊙. For the L8 dwarf Gl 584C we estimate an age of 1.0–2.5 Gyr and a mass of 0… 
The Late-T Dwarf Companion to the Exoplanet Host Star HD 3651: A New Benchmark for Gravity and Metallicity Effects in Ultracool Spectra
We present near-IR (1.0-2.5 μm) photometry and spectroscopy of HD 3651B, the low-luminosity, wide-separation (480 AU) companion to the K0 V exoplanet host star HD 3651A. We measure a spectral type of
Three Wide-Separation L Dwarf Companions from the Two Micron All Sky Survey: Gliese 337C, Gliese 618.1B, and HD 89744B
We present two confirmed wide-separation L dwarf common proper-motion companions to nearby stars and one candidate identified from the Two Micron All Sky Survey. Spectral types from optical
Discovery of a Tight Brown Dwarf Companion to theLow-Mass Star LHS 2397a
Using the adaptive optics system, Hokupa`a, at Gemini North, we have directly imaged a companion around the UKIRT faint standard M8 star LHS 2397a (FS 129) at a separation of 2.96 AU. Near-infrared
Multiplicity among Widely Separated Brown Dwarf Companions to Nearby Stars: Gliese 337CD
We present Lick Natural Guide Star Adaptive Optics observations of the L8 brown dwarf Gl 337C, which is resolved for the first time into two closely separated (0.″53 ± 0.″03), nearly equal magnitude
THE BROWN DWARF KINEMATICS PROJECT. II. DETAILS ON NINE WIDE COMMON PROPER MOTION VERY LOW MASS COMPANIONS TO NEARBY STARS,
We report on nine wide common proper motion systems containing late-type M, L, or T companions. We confirm six previously reported companions, and identify three new systems. The ages of these
THE PALOMAR/KECK ADAPTIVE OPTICS SURVEY OF YOUNG SOLAR ANALOGS: EVIDENCE FOR A UNIVERSAL COMPANION MASS FUNCTION
We present results from an adaptive optics survey for substellar and stellar companions to Sun-like stars. The survey targeted 266 F5–K5 stars in the 3 Myr–3 Gyr age range with distances of 10–190
Space Velocities of L- and T-Type Dwarfs
We have obtained radial velocities of a sample of 18 ultracool dwarfs (M6.5-T8) using high-resolution, near-infrared spectra obtained with NIRSPEC and the Keck II telescope. We have confirmed that
NEW EVIDENCE FOR A SUBSTELLAR LUMINOSITY PROBLEM: DYNAMICAL MASS FOR THE BROWN DWARF BINARY Gl 417BC
We present new evidence for a problem with cooling rates predicted by substellar evolutionary models that implies that model-derived masses in the literature for brown dwarfs and directly imaged
Two new ultracool benchmark systems from WISE+2MASS
We have used the 2MASS all-sky survey and the WISE to look for ultracool dwarfs that are part of multiple systems containing main sequence stars. We cross-matched L dwarf candidates from the surveys
DISCOVERY OF A YOUNG L DWARF BINARY, SDSS J224953.47+004404.6AB
We report discovery of a young 0.″32 L dwarf binary, SDSS J2249+0044AB, found as the result of a Keck laser guide star adaptive optics imaging survey of young field brown dwarfs. Weak K i, Na i, and
...
...

References

SHOWING 1-10 OF 91 REFERENCES
Discovery of a Brown Dwarf Companion to Gliese 570ABC: A 2MASS T Dwarf Significantly Cooler than Gliese 229B
TLDR
This new component, Gl 570D, was initially identified from the Two Micron All-Sky Survey and shows the 1.6 and 2.2 µm CH4 absorption bands characteristic of T dwarfs, while its common proper motion with the Gl 570ABC system confirms companionship.
New Neighbors from 2MASS: Activity and Kinematics at the Bottom of the Main Sequence
We have combined 2MASS and POSS II data in a search for nearby ultracool (later than M6.5) dwarfs with Ks < 12. Spectroscopic follow-up observations identify 53 M7–M9.5 dwarfs and seven L dwarfs. The
A search for companions to nearby brown dwarfs: the binary DENIS-P J1228.2-1547
TLDR
Hubble Space Telescope imaging observations of two nearby brown dwarfs, DENIS-P J1228.2-1547 and Kelu 1, show that the DENIS object is resolved into two components of nearly equal brightness with a projected separation of 0.275 arc second, demonstrating that giant planets could be detected by direct imaging if they exist in Jupiter-like orbits around nearby young Brown dwarfs.
A Search for L Dwarf Binary Systems
We present analysis of Hubble Space Telescope (HST) planetary camera images of 20 L dwarfs identified in the course of the Two Micron All Sky Survey. Four of the targets, 2MASSW J0746425+200032,
L Dwarfs and the Substellar Mass Function
Analysis of initial observations sky surveys has shown that the resulting photometric catalogs, combined with far-red optical data, provide an extremely effective method of finding isolated, very
A 2MASS L Dwarf Companion to the Nearby K Dwarf GJ 1048
We report the discovery of a probable L1 companion to the nearby K2 dwarf GJ 1048 using the Two Micron All-Sky Survey (2MASS). This source, 2MASSI J0235599-233120, or GJ 1048B, has 2MASS
Discovery of a cool brown dwarf
TLDR
The discovery of a probable companion to the nearby star G1229, with no more than onetenth the luminosity of the least luminous hydro-gen-burning star, is reported, concluding that the companion is a brown dwarf with a temperature of less than 1,200 K, and a mass ∼20–50 times that of Jupiter.
Variability in ultra cool dwarfs: Evidence for the evolution of surface features
We present photometric light curves for a sample of 21 ultra cool M and L dwarfs in the field and in the young open clusters σ Orionis and the Pleiades. The list of targets includes both low mass
Wide Field Planetary Camera 2 Observations of the Brown Dwarf Gliese 229B: Optical Colors and Orbital Motion
Three-epoch observations of the M1 V–plus–brown dwarf system Gliese 229AB using the Hubble Space Telescope's Wide Field Planetary Camera 2 (WFPC2) are reported. Relative astrometric measurements
Discovery of a low-mass brown dwarf companion of the young nearby star G 196-3
TLDR
The separation between the objects and their mass ratio suggest the fragmentation of a collapsing cloud as the most likely origin for G 196-3B, but alternatively it could have originated from a protoplanetary disc that has been dissipated.
...
...