OPTICAL AND MECHANICAL DESIGN OF THE CHARA ARRAY ADAPTIVE OPTICS

2013 ◽  
Vol 02 (02) ◽  
pp. 1340007 ◽  
Author(s):  
X. CHE ◽  
L. STURMANN ◽  
J. D. MONNIER ◽  
T. A. TEN BRUMMELAAR ◽  
J. STURMANN ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Near Infrared ◽  
Angular Resolution ◽  
Mechanical Design ◽  
Wavefront Sensor ◽  
High Angular Resolution ◽  
Stellar Systems ◽  
Tilt Correction ◽  
Chara Array ◽  
Adaptive Optics System

The CHARA array is an optical/near infrared interferometer consisting of six 1-meter diameter telescopes with the longest baseline of 331 m. With high angular resolution, the CHARA array provides a unique and powerful way of studying nearby stellar systems. In 2011, the CHARA array was funded by NSF-ATI for an upgrade of adaptive optics systems to all six telescopes to improve the sensitivity by several magnitudes. The initial grant covers Phase I of the adaptive optics system, which includes an on-telescope Wavefront Sensor and fast tip/tilt correction. We are currently seeking funding for Phase II which will add fast deformable mirrors at the telescopes to close the loop. This paper will describe the design of the project, and show simulations of how much improvement the array will gain after the upgrade.

scholarly journals Simulation Study of a Low-Light-Level Wavefront Sensor Driving a Low-Order, Near-IR Adaptive Optics System

1994 ◽  
Vol 158 ◽  
pp. 308-310
Author(s):  
David W. Tyler ◽  
Gary C. Loos
Keyword(s):  
Adaptive Optics ◽  
System Performance ◽  
Near Infrared ◽  
Light Level ◽  
Wavefront Sensor ◽  
High Fidelity ◽  
Low Light ◽  
Near Ir ◽  
Adaptive Optics System ◽  
Low Order

Two high-fidelity computer simulations are used to study low-order adaptive optics systems operating in the near-infrared. We study obtainable system performance using very dim reference sources at three IR wavelengths.

scholarly journals A High Angular Resolution Survey of Massive Stars in Cygnus OB2: JHK Adaptive Optics Results from the Gemini Near-Infrared Imager

2020 ◽  
Vol 160 (3) ◽  
pp. 115
Author(s):  
S. M. Caballero-Nieves ◽  
D. R. Gies ◽  
E. K. Baines ◽  
A. H. Bouchez ◽  
R. G. Dekany ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Near Infrared ◽  
Angular Resolution ◽  
Massive Stars ◽  
High Angular Resolution ◽  
Infrared Imager

Near-infrared pyramid wavefront sensor for Keck adaptive optics: opto-mechanical design

2018 ◽  
Author(s):  
Peter L. Wizinowich ◽  
Adam Vandenberg ◽  
Mojtaba Taheri ◽  
James K. Wallace ◽  
Mark R. Chun ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Near Infrared ◽  
Mechanical Design ◽  
Wavefront Sensor

PYRAMIR: a near-infrared pyramid wavefront sensor for the Calar Alto adaptive optics system

2003 ◽  
Author(s):  
Joana B. Costa ◽  
Stefan Hippler ◽  
Markus Feldt ◽  
Simone Esposito ◽  
Roberto Ragazzoni ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Near Infrared ◽  
Wavefront Sensor ◽  
Adaptive Optics System ◽  
Calar Alto

PHARO (Palomar high-angular-resolution observer): a dedicated NIR camera for the Palomar adaptive optics system

1997 ◽  
Author(s):  
Bernhard R. Brandl ◽  
Thomas L. Hayward ◽  
James R. Houck ◽  
George E. Gull ◽  
Bruce Pirger ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Angular Resolution ◽  
High Angular Resolution ◽  
Adaptive Optics System

Zooming into the complex dusty envelopes of C-rich AGB stars

2018 ◽  
Vol 14 (S343) ◽  
pp. 456-457
Author(s):  
Foteini Lykou ◽  
Josef Hron ◽  
Daniela Klotz
Keyword(s):  
Temperature Distribution ◽  
Near Infrared ◽  
Angular Resolution ◽  
High Angular Resolution ◽  
Dust Formation ◽  
Agb Stars ◽  
Circumstellar Envelopes ◽  
Recent Advances ◽  
Multi Wavelength

AbstractRecent advances in high-angular resolution instruments (VLT and VLTI, ALMA) have enabled us to delve deep into the circumstellar envelopes of AGB stars from the optical to the sub-mm wavelengths, thus allowing us to study in detail the gas and dust formation zones (e.g., their geometry, chemistry and kinematics). This work focuses on four (4) C-rich AGB stars observed with a high-angular resolution technique in the near-infrared: a multi-wavelength tomographic study of the dusty layers of the circumstellar envelopes of these C-rich stars, i.e. the variations in the morphology and temperature distribution.

scholarly journals High gas-to-dust size ratio indicating efficient radial drift in the mm-faint CX Tauri disk

2019 ◽  
Vol 626 ◽  
pp. L2 ◽  
Author(s):  
S. Facchini ◽  
E. F. van Dishoeck ◽  
C. F. Manara ◽  
M. Tazzari ◽  
L. Maud ◽  
...  
Keyword(s):  
Near Infrared ◽  
Angular Resolution ◽  
Spectral Energy Distribution ◽  
Theoretical Models ◽  
Intensity Profile ◽  
Continuum Emission ◽  
Spectral Energy ◽  
High Angular Resolution ◽  
Sharp Drop ◽  
Large Program

The large majority of protoplanetary disks have very compact continuum emission (≲15 AU) at millimeter wavelengths. However, high angular resolution observations that resolve these small disks are still lacking, due to their intrinsically fainter emission compared with large bright disks. In this Letter we present 1.3 mm ALMA data of the faint disk (∼10 mJy) orbiting the TTauri star CX Tau at a resolution of ∼40 mas, ∼5 AU in diameter. The millimeter dust disk is compact, with a 68% enclosing flux radius of 14 AU, and the intensity profile exhibits a sharp drop between 10 and 20 AU, and a shallow tail between 20 and 40 AU. No clear signatures of substructure in the dust continuum are observed, down to the same sensitivity level of the DSHARP large program. However, the angular resolution does not allow us to detect substructures on the scale of the disk aspect ratio in the inner regions. The radial intensity profile closely resembles the inner regions of more extended disks imaged at the same resolution in DSHARP, but with no rings present in the outer disk. No inner cavity is detected, even though the disk has been classified as a transition disk from the spectral energy distribution in the near-infrared. The emission of 12CO is much more extended, with a 68% enclosing flux radius of 75 AU. The large difference of the millimeter dust and gas extents (> 5) strongly points to radial drift, and closely matches the predictions of theoretical models.

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