SETI public: Imaging Earth-like planets with Extremely Large Telescopes

• Previous message: LARRY KLAES: "SETI public: Planetary migration"

Paper: astro-ph/0507512
Date: Thu, 21 Jul 2005 14:02:29 GMT (167kb)

Title: Imaging Earth-like planets with Extremely Large Telescopes

Authors: Alain Chelli
Comments: Accepted in Astronomy & Astrophysics
\\
We investigate the possiblity to detect Earth-like planets, in the visible
and the near infrared domains, with ground based Extremely Large Telescopes
equipped with adaptive systems capable of providing high Strehl ratios. From
a
detailed analysis of the speckle noise, we derive analytical expressions of
the
signal to noise ratio on the planet flux, for direct and differential
imaging,
in the presence of the speckle noise and the photon noise of the residual
stellar halo. We find that a 100m telescope would detect an Earth at a
distance
of 10pc, with a signal to noise ratio of 5, in an integration time of 12
hours.
This requires to control the instrumental aberrations with a precision
better
than 1 nanometer rms, and to reach an image dynamics of $1.2{\rm x}10^{6}$
at
$0\farcs 1$ radius. Under the same conditions, a telescope of 30m would
require
a dynamics of $1.3{\rm x}10^{7}$ for a positive detection

\\ ( http://arXiv.org/abs/astro-ph/0507512 , 167kb)

• Previous message: LARRY KLAES: "SETI public: Planetary migration"

This archive was generated by hypermail 2.1.6 : Fri Jul 22 2005 - 14:57:03 UTC