THE CLASSIC/CLIMB BEAM COMBINER AT THE CHARA ARRAY

2013 ◽  
Vol 02 (02) ◽  
pp. 1340004 ◽  
Author(s):  
T. A. TEN BRUMMELAAR ◽  
J. STURMANN ◽  
S. T. RIDGWAY ◽  
L. STURMANN ◽  
N. H. TURNER ◽  
...  
Keyword(s):  
Scientific Program ◽  
Wide Bandwidth ◽  
Phase Measurements ◽  
Spectral Channel ◽  
Beam Combiner ◽  
Chara Array

In the same way that every telescope has multiple instruments and cameras, an interferometric array like the CHARA Array will have numerous beam combiners at the back end. And like the instruments of a single telescope, each of these combiners will be optimized for a particular kind of observation or scientific program. In this paper we describe the CLASSIC and CLIMB beam combiners of the CHARA Array. Both are open air, aperture plane, wide bandwidth single spectral channel instruments optimized for sensitivity. CLASSIC is the original two beam combiner used for the first science at CHARA, and it still has the faintest magnitude limit. CLIMB is a three beam expansion of CLASSIC that can also provide closure phase measurements.

A low-noise HAWAII detector system and new cold optics for the CLASSIC/CLIMB beam combiner instrument of the CHARA array

2014 ◽  
Author(s):  
Udo Beckmann ◽  
Claus Connot ◽  
Matthias Heininger ◽  
Karl-Heinz Hofmann ◽  
Eddy Nußbaum ◽  
...  
Keyword(s):  
Low Noise ◽  
Detector System ◽  
Beam Combiner ◽  
Chara Array

FLUOR fibered beam combiner at the CHARA array

2003 ◽  
Author(s):  
Vincent Coude du Foresto ◽  
Pascal J. Borde ◽  
Antoine Merand ◽  
Cyrille Baudouin ◽  
Antonin Remond ◽  
...  
Keyword(s):  
Beam Combiner ◽  
Chara Array

JOUVENCE OF FLUOR: UPGRADES OF A FIBER BEAM COMBINER AT THE CHARA ARRAY

2013 ◽  
Vol 02 (02) ◽  
pp. 1340005 ◽  
Author(s):  
N. J. SCOTT ◽  
R. MILLAN-GABET ◽  
E. LHOMÉ ◽  
T. A. TEN BRUMMELAAR ◽  
V. COUDÉ DU FORESTO ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Modes Of Operation ◽  
Software Upgrades ◽  
Remote Operation ◽  
Beam Combiner ◽  
Control Command ◽  
Spectral Dispersion ◽  
Chara Array ◽  
Software Standards ◽  
Pupil Plane

The FLUOR (Fiber Linked Unit for Optical Recombination) interferometric beam combiner located at the CHARA Array on Mt. Wilson, California has recently undergone a program of major upgrades known as Jouvence of FLUOR (JouFLU). These upgrades seek to improve the precision, use, and observing efficiency of FLUOR as well as introduce new modes of operation. A Fourier Transform Spectrograph (FTS) mode and a spectral dispersion mode have been added to improve calibration and data collection. New mechanized stages and new cameras have been added to FLUOR for alignment and pupil plane imaging. Entirely new control/command software has been written for FLUOR which brings it into compliance with CHARA software standards. This allows for continued software upgrades and full remote operation capability. The new JouFLU instrument is now operating on sky and is expected to achieve accurate interferometric visibility amplitude measurements with 0.1 to 0.3% precision.

Dual three-way infrared beam combiner at the CHARA Array

2010 ◽  
Author(s):  
Judit Sturmann ◽  
Theo ten Brummelaar ◽  
Laszlo Sturmann ◽  
Harold A. McAlister
Keyword(s):  
Beam Combiner ◽  
Chara Array

JouFLU: an upgraded FLUOR beam combiner at the CHARA Array

2012 ◽  
Author(s):  
E. Lhomé ◽  
N. Scott ◽  
T. ten Brummelaar ◽  
B. Mollier ◽  
J. M. Reess ◽  
...  
Keyword(s):  
Beam Combiner ◽  
Chara Array

Prototype single-mode fiber beam combiner for the CHARA array

1998 ◽  
Author(s):  
Nils H. Turner ◽  
Theo A. ten Brummelaar
Keyword(s):  
Single Mode ◽  
Single Mode Fiber ◽  
Beam Combiner ◽  
Chara Array

Data analysis for the CHARA Array CLIMB beam combiner

2012 ◽  
Author(s):  
Theo A. ten Brummelaar ◽  
Judit Sturmann ◽  
Harold A. McAlister ◽  
Laszlo Sturmann ◽  
Nils H. Turner ◽  
...  
Keyword(s):  
Data Analysis ◽  
Beam Combiner ◽  
Chara Array

scholarly journals Closure phase studies toward direct detection of light from hot Jupiters

2007 ◽  
Vol 3 (S249) ◽  
pp. 71-77
Author(s):  
Ming Zhao ◽  
John D. Monnier ◽  
Theo ten Brummelaar ◽  
Ettore Pedretti ◽  
Nathalie Thureau
Keyword(s):  
High Precision ◽  
Test Object ◽  
Direct Detection ◽  
Phase Measurements ◽  
Hot Jupiters ◽  
Long Baseline ◽  
Optical Interferometers ◽  
Phase Study ◽  
Chara Array ◽  
Very High

AbstractPrecision closure phase measurements obtained with ground-based long baseline optical interferometers is a promising way to directly detect light from nearby hot Jupiters. Here we present our closure phase simulations for the CHARA array for several bright hot Jupiters, υ And b, 51 Peg b, and τ Boo b. The maximum possible closure phase signals from these hot Jupiters are very small, for example, only ∼0.17 degrees for υ And b, requiring very high precision and stable closure phase measurements. We present preliminary results of a closure phase study on test object β Tau and hot Jupiter system υ And, both obtained with the MIRC instrument at the CHARA array. We demonstrate that directly detecting the light from hot Jupiters is feasible using high precision closure phase measurements obtained by CHARA-MIRC along with its sub-milli-arcsecond resolution, although challenges remain.

scholarly journals Multi-epoch interferometric observations of the Be star ζ Tau

2010 ◽  
Vol 6 (S272) ◽  
pp. 424-425
Author(s):  
Gail H. Schaefer ◽  
Douglas R. Gies ◽  
John D. Monnier ◽  
Noel D. Richardson ◽  
Yamina N. Touhami ◽  
...  
Keyword(s):  
Geometric Model ◽  
Position Angle ◽  
Brightness Distribution ◽  
Be Stars ◽  
Monitoring Campaign ◽  
Asymmetric Structures ◽  
Beam Combiner ◽  
Be Star ◽  
Outward Motion ◽  
Chara Array

AbstractWe present interferometric observations of the Be star ζ Tau obtained using the MIRC beam combiner at the CHARA Array during four epochs in 2007–2009. Fitting a geometric model to the data reveals a nearly edge-on disk with a FWHM of ~1.8 milli-arcsec in the H-band. The non-zero closure phases indicate an asymmetry in the brightness distribution. Interestingly, when combining our results with previously published interferometric observations of ζ Tau, we find a correlation between the position angle of the disk and the spectroscopic V/R ratio, suggesting that the tilt of the disk might be precessing. This work is part of a multi-year monitoring campaign to investigate the development and outward motion of asymmetric structures in the disks of Be stars.

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