From Keck: “W. M. Keck Observatory Awarded NSF Grant to Boost Performance of Adaptive Optics System”

Keck Observatory

Keck Observatory.
Keck, with Subaru and IRTF (NASA Infrared Telescope Facility). Vadim Kurland

Keck Observatory

December 15, 2017
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Adaptive optics (AO) measures and then corrects the atmospheric turbulence using a deformable mirror that changes shape 1,000 times per second. Initially, AO relied on the light of a star that was both bright and close to the target celestial object. But there are only enough bright stars to allow AO correction in about one percent of the sky. In response, astronomers developed Laser Guide Star Adaptive Optics using a special-purpose laser to excite sodium atoms that sit in an atmospheric layer 60 miles above Earth. Exciting the atoms in the sodium layers creates an artificial “star” for measuring atmospheric distortions which allows the AO to produce sharp images of celestial objects positioned nearly anywhere in the sky. IMAGE CREDIT: ANDREW RICHARD HARA,

One of the most scientifically productive adaptive optics (AO) systems on Earth is getting a major upgrade, one that will further advance high-impact research on the hunt for habitable exoplanets, the supermassive black hole at the center of the Milky Way, and the nature of Dark Matter and Dark Energy.

The National Science Foundation (NSF) has awarded funding to the W. M. Keck Observatory on Maunakea, Hawaii for a significant enhancement of the performance of the AO system on the Keck II telescope.

“The Keck telescopes were the first large telescopes to be equipped with adaptive optics and subsequently laser guide stars. All major astronomical telescopes now have laser guide star AO systems. Despite this competition, Keck Observatory’s AO systems have remained the most scientifically productive in the world. This upgrade will help maintain our science community’s competitive advantage,” said Principal Investigator Peter Wizinowich, chief of technical development at Keck Observatory.

AO is a technique used to remove the distortions caused by turbulence in the Earth’s atmosphere. This results in sharper, more detailed astronomical images. This upgrade will further improve the clarity of the images formed by the telescope.

The project will deliver a faster, more flexible real-time controller (RTC), as well as a better, lower noise camera for wavefront sensing. This will reduce the camera readout and computation time between the time that an image is captured and a correction for atmospheric blurring is made.


“Any delay means the correction is applied for atmospheric turbulence that has already started to change. Even if the correction happens in just a few milliseconds, we want to reduce the delay to a minimum. The new RTC computer and camera uses advanced technology to do just that,” said Sylvain Cetre, a software engineer at Keck Observatory who plays a lead role in developing the new RTC.

Recognizing this as a valuable STEM (Science, Technology, Engineering, and Mathematics) opportunity for education and workforce development, Keck Observatory will include a postdoc as well as a Hawaii college student from the summer Akamai Internship Program to work on the development of the project.

“Part of Keck Observatory’s mission is to train and prepare future generations so the work continues long after we are gone,” said Jason Chin, a senior engineer at Keck Observatory and project manager for the new RTC. “Many of Hawaii’s finest students, scientists, and engineers end up working on the mainland away from their families. We want to show them there is a vibrant tech industry in Hawaii. One of the ways we do that is by participating in the Akamai Internship Program, which has one of the highest retention rates for Hawaii college students staying in the STEM field. We are proud that many are working in our local tech industry.”

Co-Principal Investigators Andrea Ghez, Director of the UCLA Galactic Center Group, Jessica Lu, Assistant Astronomy Professor at UC Berkeley, Dimitri Mawet, Associate Astronomy Professor at Caltech, and Tommaso Treu, Physics and Astronomy Professor at UCLA, will also involve graduate and postdoc students. Their teams will use the new capabilities of Keck Observatory’s AO system to pursue science projects in three fields of study:

1.Characterizing planets around low mass stars via direct imaging and spectroscopy

2.Testing Einstein’s Theory of General Relativity and understanding supermassive black hole interactions at the Galactic Center

3.Constraining Dark Matter, the Hubble constant, and Dark Energy via strong gravitational lensing

“These instrumentation improvements will not only enhance the scientific return of our existing AO system, but it will also provide an excellent platform for future improvements,” said Wizinowich. “We were very pleased to learn that our proposal was successful.”

The upgrade is expected to be completed by the end of 2020.

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The W. M. Keck Observatory operates the largest, most scientifically productive telescopes on Earth. The two, 10-meter optical/infrared telescopes on the summit of Mauna Kea on the Island of Hawaii feature a suite of advanced instruments including imagers, multi-object spectrographs, high-resolution spectrographs, integral-field spectrometer and world-leading laser guide star adaptive optics systems. Keck Observatory is a private 501(c) 3 non-profit organization and a scientific partnership of the California Institute of Technology, the University of California and NASA.

Today Keck Observatory is supported by both public funding sources and private philanthropy. As a 501(c)3, the organization is managed by the California Association for Research in Astronomy (CARA), whose Board of Directors includes representatives from the California Institute of Technology and the University of California, with liaisons to the board from NASA and the Keck Foundation.

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