Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...298..544l&link_type=abstract
Astronomy and Astrophysics, v.298, p.544
Astronomy and Astrophysics
Astrophysics
41
Planetary Systems, Techniques: Interferometric, Techniques: Miscellaneous
Scientific paper
The detection of exo-planets, the planets which may be associated to stars outside of the solar system, is widely expected to become possible in space (???; ???; ???; ???) with telescopes somewhat larger than the 2.4m Hubble Space Telescope. The main difficulty arises from the halo of speckled light diffracted around the comparatively bright image of the star. It can be attenuated with adaptive optical techniques correcting the imperfections of the telescope, and the atmospheric disturbance when observing from the ground (???; ???). Angel (1994) has recently proposed to use adaptive ground-based imaging, with a high level of adaptive correction, to detect exo-planets in long exposures. It now appears that the detection sensitivity can be further improved, or the tolerances on residual "seeing" relaxed, by recording the dark speckles which briefly appear in the image. The principle is also applicable to searching exo-planets with space telescopes, including the Hubble Space Telescope.
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