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Table 1

Archival spectral data analyzed in this paper.

Object Date Instrument SN (per frame) SN (transit) λ range (nm) #In frames Binning
HD 209458b (1) 10-24-2002 HDS at Subaru 1300 2300 550–680 17 No
HD 189733b (2) 07-01-2012 UVES at VLT 110 2500 560–940 92 2s, 4t
HD 189733b (3) 09-07-2006 HARPS at LaSilla 100 770 380–690 19 2s
TrES-2b (4) 04-26-2007 HIRES at Keck 200 660 490–640 30 ~ 4t
WASP-74b (5) 07-28-2017 UVES at VLT 80 1400 560–940 14 2s
HAT-P-2b (6) 06-06-2007 HIRES at Keck 300 2500 490–640 62 3t

Notes. The S/N was calculated empirically from the residuals on the continuum of transitions approved by our QT. The S/N per frame was calculated in each frame and scaled by the number of pixels per angstrom. On the other hand, the S/N per transit was calculated on the first frame and scaled by the number of pixels in one FWHM and the number of in-transit frames (#in frames at the table). In the binning column, 2s means that we binned two pixels in wavelength, and 4t means that we binned four frames in time. TrES-2b was a special binning case, as we performed a nonuniform time binning. The references for each dataset are listed below.

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