SETI public: High-precision K-band photometry of the secondary eclipse of HD209458

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Paper: astro-ph/0507618
Date: Tue, 26 Jul 2005 19:32:11 GMT (52kb)

Title: High-precision K-band photometry of the secondary eclipse of HD209458

Authors: Ignas Snellen (leiden)
Comments: 6 pages; accepted by MNRAS
\\
Recently, mid-infrared Spitzer observations have been presented that show
the
light decrement due to the passage of a planet behind its host star. These
measurements of HD209458b and TrES-1 are the first detections of direct
light
from an extra-solar planet. Interpretation of these results in terms of
planet
equipartition temperature and bond albedo is however strongly model
dependent
and require additional observations at shorter wavelengths. Here we report
on
two attempts to detect the secondary eclipse of HD209458b from the ground in
K-band, using the UK InfraRed Telescope (UKIRT). A photometry precision of
0.12% relative to two nearby reference stars was reached during both
occasions,
but no firm detection of the eclipses were obtained. The first observation
shows a flux decrement of -0.13+-0.18%, and the second of -0.10+-0.10%. A
detailed description of the observing strategy, data reduction and analysis
is
given, and a discussion on how the precision in ground-based K-band
photometry
could be further improved. In addition we show that the relative photometry
between the target and the reference stars between the two epochs is
consistent
down to the <0.1% level, which is interesting in the light of possible
near-infrared surveys to search for transiting planets around M and L
dwarfs.

\\ ( http://arXiv.org/abs/astro-ph/0507618 , 52kb)

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