Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...20114402k&link_type=abstract
American Astronomical Society Meeting 201, #144.02; Bulletin of the American Astronomical Society, Vol. 35, p.569
Astronomy and Astrophysics
Astronomy
Scientific paper
The upper limit on the reflected visible light fraction from the transiting planet HD 209458b is approximately 0.02%. Theoretical models also suggest that pressure broadened spectral features can be resolved with a spectral resolution of about 20. This opens up the possibility of ground-based direct detection of light from the planet's atmosphere.
We use a low-dispersion transmission grating (spectral resolution of 85) to take spectra of the HD 209458 system as the planet passes behind its parent star. Knowing the times of ingress and egress and with a simple model of the Earth's atmospheric absorption, a reflected light spectrum of the planet is estimated from the data.
We present a reduction method that partially removes systematic effects of the Earth's atmosphere, allowing us to reach a broad-band sensitivity of 0.08%. Further discussion on ground-based limits to spectrophotometry is also presented.
This research is supported by the NSF under Grant AST-0094050.
Hinz Philip M.
Kenworthy Matthew A.
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