Spectrally resolved detection of sodium in the atmosphere of HD 189733b with the HARPS spectrograph

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Volume 577 (May 2015)

A&A, 577 (2015) A62

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Table 1

Observations log for HD 189733.

	Date	# Spectra^a	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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