Detection of barium in the atmospheres of the ultra-hot gas giants WASP-76b and WASP-121b - Together with new detections of Co and Sr+ on WASP-121b

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Table 1.

Summary of the transit observations of WASP-76b and WASP-121b.

Target	Night	Exp. time (s)	N_obs	N_{obs, in-transit}^(a)	Airmass change ^(b)	S/N at 550 nm	Mode
WASP-76b	2018-09-03 (N1)	600	35	16 (20)	1.99 – 1.13 – 1.37	∼101	1-UT HR21
WASP-76b	2018-10-31 (N2)	300	70	30 (37)	1.42 – 1.13 – 2.64	∼79	1-UT HR21
WASP-121b	2018-11-30 (N1)	300	29	17 (20)	1.11 – 1.03 – 1.07	∼151	4-UT MR42
WASP-121b	2019-01-06 (N2)	400	52	17 (23)	1.20 – 1.03 – 1.61	∼47	1-UT HR21

Notes.

^(a)

Number of spectra obtained between second and third contact. In parentheses, we list the number for the duration of the first to forth contact.

^(b)

Airmass change during the night (start – minimum – end).

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