The Hubble PanCET program: an extensive search for metallic ions in the exosphere of GJ 436 b

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Table 2

Observations log of GJ 436 with HST-COS centered at 1291 Å.

Visit	Orbit	Start time	Exp. time	Phase
Visit	Orbit	(UT)	(s)	(h)
Hubble PanCET program

	1	2017-11-19 20:30:21	1881.184	−1.32
	2 ^(†)	2017-11-19 21:49:34	2702.08	⋯
A	3	2017-11-19 23:24:55	2702.176	+1.71
	4	2017-11-20 01:00:15	2702.112	+3.30
	5	2017-11-20 02:36:06	2702.176	+4.89

	1	2017-12-21 12:17:30	1881.152	−2.97
	2	2017-12-21 13:34:53	2702.144	−1.57
B	3	2017-12-21 15:10:16	2702.144	+0.02
	4	2017-12-21 16:45:38	2702.144	+1.61
	5	2017-12-21 18:21:00	2702.144	+3.20

	1	2018-01-24 21:02:28	1688.192	−3.15
	2	2018-01-24 22:17:19	2702.176	−1.76
C	3	2018-01-24 23:52:39	2702.176	−0.17
	4	2018-01-25 01:27:59	2702.176	+1.42
	5	2018-01-25 03:03:19	2702.176	+3.01

	1	2018-02-28 07:32:12	1688.096	−1.55
	2	2018-02-28 08:48:36	2702.176	−0.13
D	3	2018-02-28 10:23:56	2702.176	+1.46
	4 ^(†)	2018-02-28 11:59:18	2702.176	⋯
	5	2018-02-28 13:34:39	2702.176	+4.64

MUSCLES program

	1	2012-06-23 07:22:56	980.192	−14.76
E	2	2012-06-23 07:41:15	1191.168	−14.43
	3	2012-06-23 08:47:20	1200.192	−13.32

	1	2015-06-25 23:37:36	1243.168	−3.68
	2	2015-06-26 00:43:54	2713.184	−2.37
F	3	2015-06-26 02:19:20	2713.216	−0.80
	4	2015-06-26 03:54:46	2713.184	+0.79
	5	2015-06-26 05:30:12	2713.216	+2.38

Program GO-15174

⋯	1	2017-12-22 21:35:19	1957.152	+30.34
	2	2017-12-23 21:25:43	1957.184	−9.28
	3	2017-12-24 09:55:32	1957.152	+3.22
	4	2017-12-24 16:29:58	1957.152	+9.79
	5	2018-01-19 10:24:56	1850.176	−6.84
	6	2018-01-19 15:27:48	1850.144	−1.79
	7	2018-02-08 13:52:25	1850.144	−31.01
	8	2018-02-23 08:19:12	1850.144	+6.17

Notes. Phases are in relation to the orbit of GJ 436 b. Orbits marked with ^(†) had a pointing failure and did not register counts; these orbits were discarded from our analysis. Observations of program GO-15174 were performed with single-orbit visits.

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