A high-Strehl low-resolution optical imager (BESSEL): Detection of a 0.7λ/D separation binary from the ground

Mary Anne Peters, Laird M Close, Matt Rademacher, Tom Stalcup, Grover A. Swartzlander, Erin Ford, Rukiah S. Abdul-Malik

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We have constructed a high-speed image stabilization system, BESSEL, which mounts to the 8-in. refractive telescope coupled to the ray white telescope at steward observatory. The high-speed tip/tilt mirror platform is controlled by an Andor electron multiplication EMCCD enabling wavefront correction at a rate exceeding 1 kHz. BESSEL achieves on-sky Strehl ratios of 98-99% at λ = 800 nm when the telescope aperture is stopped down to half the Fried parameter (typically D = 25.4 mm, where D is the diameter of the effective telescope aperture). Utilizing high Strehls and the technique of roll subtraction enabled BESSEL to resolve the binary, ADS 10418AB (more commonly known as α Her), with separation of only 0.71λ/D and a delta magnitude of ∼3 mag at 800 nm. In addition, Arcturus was observed with BESSEL to explore a relatively untested region of Strehl versus D/r0 parameter space in the optical, specifically at small (∼0.5D/r0). We find that in this regime space quality, very high Strehl (∼99%), optical imaging can be obtained from the ground when D/r0 < 0.5 as one approaches the inner scale of turbulence. Because of BESSEL's demonstrated high Strehls, it is an ideal platform for inexpensive, initial, on-sky characterization of space-based coronagraphs, for which it will be used in the near future.

Original languageEnglish (US)
Pages (from-to)359-369
Number of pages11
JournalNew Astronomy
Volume13
Issue number5
DOIs
StatePublished - Jul 2008

Fingerprint

Image sensors
Telescopes
telescopes
sky
platforms
apertures
high speed
tilt
coronagraphs
stabilization
Observatories
Wavefronts
observatory
turbulence
multiplication
subtraction
electron
rays
observatories
Mirrors

Keywords

  • (Stars:) binaries: visual
  • (Stars:) planetary systems
  • 95.55.-n
  • 95.75.Qr
  • Instrumentation: adaptive optics

ASJC Scopus subject areas

  • Astronomy and Astrophysics

Cite this

Peters, M. A., Close, L. M., Rademacher, M., Stalcup, T., Swartzlander, G. A., Ford, E., & Abdul-Malik, R. S. (2008). A high-Strehl low-resolution optical imager (BESSEL): Detection of a 0.7λ/D separation binary from the ground. New Astronomy, 13(5), 359-369. https://doi.org/10.1016/j.newast.2007.11.008

A high-Strehl low-resolution optical imager (BESSEL) : Detection of a 0.7λ/D separation binary from the ground. / Peters, Mary Anne; Close, Laird M; Rademacher, Matt; Stalcup, Tom; Swartzlander, Grover A.; Ford, Erin; Abdul-Malik, Rukiah S.

In: New Astronomy, Vol. 13, No. 5, 07.2008, p. 359-369.

Research output: Contribution to journalArticle

Peters, MA, Close, LM, Rademacher, M, Stalcup, T, Swartzlander, GA, Ford, E & Abdul-Malik, RS 2008, 'A high-Strehl low-resolution optical imager (BESSEL): Detection of a 0.7λ/D separation binary from the ground', New Astronomy, vol. 13, no. 5, pp. 359-369. https://doi.org/10.1016/j.newast.2007.11.008
Peters, Mary Anne ; Close, Laird M ; Rademacher, Matt ; Stalcup, Tom ; Swartzlander, Grover A. ; Ford, Erin ; Abdul-Malik, Rukiah S. / A high-Strehl low-resolution optical imager (BESSEL) : Detection of a 0.7λ/D separation binary from the ground. In: New Astronomy. 2008 ; Vol. 13, No. 5. pp. 359-369.
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