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Table 2

Log of observations.

Date # Spectra1 Exp. time [s] Airmass2 Seeing S / N S / N
continuum3 Na core4

Night 1 2015-12-06 41 (14/27) 600 1.9–1.02–1.3 not recorded 20.7–32.6 5–7
Night 2 2015-12-31 44 (12/32) 600 1.4–1.02–2.2 0.5–1.3 10.2–38.1 2–8
Night 3 2016-01-14 40 (13/27) 600 1.2–1.02–2.3 0.5–1.0 21.8–39.5 5–9

Notes.

(1)

In parenthesis: the number of spectra taken during the transit and outside the transit, respectively.

(2)

The three figures indicate the airmass at the start, middle and end of observations, respectively.

(3)

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

(4)

The S/N in the line cores of the Na i D doublet.

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