Detection of Na in the atmosphere of the hot Jupiter HAT-P-55b

Open Access

Table 1

Details of the transit observation for HAT-P-55b.

Target star	HAT-P-55
Reference star	2MASS J17371483+2543127
Date (UT)	2020-05-02
Observing time (UT)	00:23–05:41
Slit (″)	40
Exposure time (s)	30
Number of exposures	340
Airmass^(a)	1.538–1.001–1.070
Seeing ^(b) (″)	0.7–1.9
Median S/N per pixel^(c)	238–240–242 (Target)
	252–257–258 (Reference)

Notes. The observation was performed with Proposal ID GTC24-20A (PI: Enric Pallé). ^(a)Start/minimum/end. ^(b)95% interval, measured by the full width at half maximum of the stellar spectrum along the spatial direction at the central wavelength. ^(c)Pre-transit/in-transit/post-transit.

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