Evidence for stellar contamination in the transmission spectra of HAT-P-12b

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Table 1

Details of two transit observations for HAT-P-12b.

Parameter	OB12	OB13
Program ID	GTC17-12A ^(a)	GTC52-13A ^(a)
RA (J2000)	13^h57^m33.467^s
Dec (J2000)	+ 43°29′36.602″
Observing date	21 Apr. 2012	17 Mar. 2013
Start time (UT)	00:13:13	22:50:34
End time (UT)	03:31:07	02:34:42
Exposure time (s)	45	40
Readout velocity (kHz)	500	200 ^(b)
Readout time (s)	7.8	21.0
Readout noise (e⁻)	~8.0	~4.5
Frame number	209	213
Airmass	1.03–1.17	1.05–1.79
FWHM ^(c)	0.64″–1.02″	0.94″–1.70″
Resolving power (Å)	6.6–10.5	9.7–17.5

Notes. ^(a) PI: E. Pallé. ^(b) Readout speed of 200 kHz is currently the standard mode for OSIRIS. ^(c)Full width at half maximum (FWHM) of the point spread function (PSF) of stars in the spatial direction at the central wavelength of 7187 Å.

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