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Table 1

Observations log for HD 189733.

Date # Spectraa Exp. time [s] Airmass Seeing S/N b S/N c Program Analysis

Night 1 2006-09-07 20 (9/11) 900 to 600 1.6–2.1 0.7–1.0 ~170 ~32 072.C-0488(E) Yes
Night 2 2007-07-19 39 (18/21) 300 2.4–1.6 0.6–0.8 ~110 ~20 079.C-0828(A) Yes
Night 3 2007-08-28 40 (19/21) 300 2.2–1.6 0.7–2.0 ~100 ~18 079.C-0127(A) Yes
Night 4 2006-07-29 12 (5/7) 600 1.8–1.6 0.9–1.2 ~140 ~27 072.C-0488(E) No

Notes. Three transit events are analyzed in our work.

(a)

In parenthesis: the number of spectra taken during the transit (forming our in-transit sample) and outside the transit (forming our out-of-transit sample).

(b)

The signal-to-noise ratio (S/N) per extracted pixel in the continuum near 590 nm.

(c)

The S/N in the line cores of the Na i D doublet (this shows the first difficulty of sodium detection in exoplanet atmospheres).

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