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Companion Detection Limits with Adaptive Optics Coronagraphy

Published online by Cambridge University Press:  26 May 2016

B. R. Oppenheimer ,
R. G. Dekany ,
M. Troy ,
T. Hayward  and
B. Brandl
B. R. Oppenheimer
Affiliation:
Astronomy Dept., University of California-Berkeley, Berkeley, CA 94720, USA
R. G. Dekany
Affiliation:
Jet Propulsion Laboratory, Oak Grove Dr., Pasadena, CA 91125, USA
M. Troy
Affiliation:
Jet Propulsion Laboratory, Oak Grove Dr., Pasadena, CA 91125, USA
T. Hayward
Affiliation:
Astronomy Dept., Cornell University, Ithaca, NY 11410, USA
B. Brandl
Affiliation:
Astronomy Dept., Cornell University, Ithaca, NY 11410, USA

Abstract

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We present a study of the Palomar Adaptive Optics System and the PHARO near infrared camera in coronagraphic mode. The camera provides two different focal plane occulting masks–opaque circular disks 0.43 and 0.97″ across. Three different pupil plane apodizing masks (Lyot masks) are also provided. The six different combinations of Lyot mask and focal plane mask suppress differently the point spread function of a bright star centered on the focal plane mask. We obtained images of the bright nearby star Gliese 614 with all six different configurations in the K filter. We measured the dynamic range achievable with these configurations. Within 2.5″, the dynamic range is at least 8 magnitudes at the 5σ level and as high as 12 in a 1 s exposure. This represents a substantial gain over similar techniques without adaptive optics.

Type
Part I: Discovery and study of extrasolar planets - current
Information
Symposium - International Astronomical Union , Volume 202: Planetary Systems in the Universe – Observation, Formation and Evolution , 2004 , pp. 99 - 102
Copyright
Copyright © Astronomical Society of the Pacific 2004 

References

Dekany, R. G., Brack, G., Palmer, D., Oppenheimer, B. R., Hayward, T. L., & Brandl, B. 1998, Proc. SPIE, 3353, 56.CrossRefGoogle Scholar
Oppenheimer, B. R. 1999, , California Institute of Technology.Google Scholar