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Proceedings Paper

Into the blue: AO science with MagAO in the visible
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Paper Abstract

We review astronomical results in the visible (λ<1μm) with adaptive optics. Other than a brief period in the early 1990s, there has been little astronomical science done in the visible with AO until recently. The most productive visible AO system to date is our 6.5m Magellan telescope AO system (MagAO). MagAO is an advanced Adaptive Secondary system at the Magellan 6.5m in Chile. This secondary has 585 actuators with < 1 msec response times (0.7 ms typically). We use a pyramid wavefront sensor. The relatively small actuator pitch (~23 cm/subap) allows moderate Strehls to be obtained in the visible (0.63-1.05 microns). We use a CCD AO science camera called “VisAO”. On-sky long exposures (60s) achieve <30mas resolutions, 30% Strehls at 0.62 microns (r') with the VisAO camera in 0.5” seeing with bright R < 8 mag stars. These relatively high visible wavelength Strehls are made possible by our powerful combination of a next generation ASM and a Pyramid WFS with 378 controlled modes and 1000 Hz loop frequency. We'll review the key steps to having good performance in the visible and review the exciting new AO visible science opportunities and refereed publications in both broad-band (r,i,z,Y) and at Halpha for exoplanets, protoplanetary disks, young stars, and emission line jets. These examples highlight the power of visible AO to probe circumstellar regions/spatial resolutions that would otherwise require much larger diameter telescopes with classical infrared AO cameras.

Paper Details

Date Published: 7 August 2014
PDF: 14 pages
Proc. SPIE 9148, Adaptive Optics Systems IV, 91481M (7 August 2014); doi: 10.1117/12.2057297
Show Author Affiliations
Laird M. Close, Steward Observatory, The Univ. of Arizona (United States)
Jared R. Males, Steward Observatory, The Univ. of Arizona (United States)
Katherine B. Follette, Steward Observatory, The Univ. of Arizona (United States)
Phil Hinz, Steward Observatory, The Univ. of Arizona (United States)
Katie Morzinski, Steward Observatory, The Univ. of Arizona (United States)
Ya-Lin Wu, Steward Observatory, The Univ. of Arizona (United States)
Derek Kopon, Max-Planck-Institut für Astronomie (Germany)
Armando Riccardi, INAF - Osservatorio Astrofisico di Arcetri (Italy)
Simone Esposito, INAF - Osservatorio Astrofisico di Arcetri (Italy)
Alfio Puglisi, INAF - Osservatorio Astrofisico di Arcetri (Italy)
Enrico Pinna, INAF - Osservatorio Astrofisico di Arcetri (Italy)
Marco Xompero, INAF - Osservatorio Astrofisico di Arcetri (Italy)
Runa Briguglio, INAF - Osservatorio Astrofisico di Arcetri (Italy)
Fernando Quiros-Pacheco, INAF - Osservatorio Astrofisico di Arcetri (Italy)


Published in SPIE Proceedings Vol. 9148:
Adaptive Optics Systems IV
Enrico Marchetti; Laird M. Close; Jean-Pierre Véran, Editor(s)

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