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Table 8

Measured LBM and spectral slope for 24 hot Jupiters with low-resolution optical transmission spectroscopy.

Planet Teq (a) gp (a) R⋆ (a) LBM(Na) LBM(K) α(b) H(c) (d) Reference
          
(K) (m s−1) (R⊙) (μm/H) (μm/H) [R⋆] (ppm)
HAT-P-1b 1.174 2.21 ± 2.55 1.02 ± 2.69 0.3 ± 1.3 0.0008 180 1
HAT-P-12b 0.679 − 1.16 ± 1.85 1.12 ± 3.06 −3.6 ± 1.5 0.0012 343 1, 2
HAT-P-18b 0.717 −1.07 ± 1.17 −1.14 ± 0.96 −3.1 ± 1.0 0.0011 303 3
HAT-P-32b 1.225 0.25 ± 0.39 0.41 ± 0.37 −1.5 ± 0.5 0.0013 383 4, 5, 6, 7
HAT-P-41b 1.683 3.65 ± 2.10 – −2.4 ± 2.6 0.0009 178 8
HD 189733b 0.752 −0.47 ± 0.75 0.98 ± 0.65 −6.1 ± 1.0 0.0004 120 1
HD 209458b 1.162 5.80 ± 1.12 0.76 ± 0.92 −0.4 ± 0.7 0.0007 170 1
WASP-4b 0.910 1.72 ± 0.60 −0.13 ± 2.16 0.6 ± 1.8 0.0006 176 9
WASP-6b 0.864 −1.85 ± 1.53 2.05 ± 1.55 −1.7 ± 0.3 0.0009 260 1
WASP-12b 1.657 −1.62 ± 3.63 −0.91 ± 2.72 −4.2 ± 1.5 0.0008 188 1
WASP-17b 1.583 −5.77 ± 4.02 5.22 ± 3.60 −3.5 ± 2.0 0.0018 454 1
WASP-19b 1.018 −2.69 ± 1.25 −0.04 ± 0.77 −9.3 ± 1.6 0.0007 211 10 (e)
WASP-19b 1.018 −1.69 ± 1.86 3.08 ± 1.87 −4.3 ± 2.8 0.0007 211 11 (e)
WASP-21b 1.136 24.04 ± 3.10 −1.72 ± 2.61 −0.2 ± 2.2 0.0012 251 12
WASP-29b 0.808 3.30 ± 7.05 – −1.6 ± 2.1 0.0006 122 13
WASP-31b 1.252 −3.12 ± 1.77 −1.47 ± 2.97 2.0 ± 1.5 0.0014 362 1
WASP-39b 0.939 4.88 ± 1.55 3.86 ± 2.26 −0.8 ± 1.7 0.0015 421 1
WASP-52b 0.786 −1.70 ± 0.73 1.51 ± 0.65 −1.9 ± 1.0 0.0013 413 14, 15
WASP-69b 0.813 −0.40 ± 1.38 −0.86 ± 0.50 −3.1 ± 0.7 0.0011 307 16
WASP-76b 1.716 1.26 ± 1.07 −0.70 ± 2.90 −0.6 ± 1.0 0.0011 238 17
WASP-80b 0.593 0.66 ± 1.88 0.49 ± 1.42 1.7 ± 1.2 0.0005 171 18
WASP-96b 1.050 9.83 ± 2.09 4.62 ± 2.27 1.2 ± 3.4 0.0008 195 19
WASP-121b 1.458 1.57 ± 2.07 1.43 ± 2.87 0.7 ± 1.6 0.0009 233 20
WASP-127b 1.390 2.85 ± 0.87 4.40 ± 0.95 −2.4 ± 0.7 0.0024 492 21
XO-2b 0.998 6.29 ± 1.48 – 0.2 ± 0.7 0.0005 102 22

Notes. (a) Equilibrium temperature Teq, surface gravity gp, and stellar radius R⋆ are taken from TEPCat (Southworth 2011). (b)Scattering slope of the transmission spectrum between 510 and 900 nm, excluding two 80 nm bands centered at Na and K, respectively. (c) H = kBTeq∕μgp is the atmospheric scale height, where μ = 2.3 g mol−1 is assumed. is the transmission signal per scale height. (e)Due to discrepant results, the measurements for WASP-19b are listed individually, while weighted average values are presented for the other planets when multiple observations are available.

References.(1) Sing et al. (2016); (2) Wong et al. (2020); (3) Kirk et al. (2017); (4) Gibson et al. (2013a); (5) Mallonn & Strassmeier (2016); (6) Nortmann et al. (2016); (7) Alam et al. (2020); (8) Wakeford et al. (2020); (9) Huitson et al. (2017); (10) Sedaghati et al. (2017); (11) Espinoza et al. (2019); (12) This work; (13) Gibson et al. (2013b); (14) Chen et al. (2017b); (15) Alam et al. (2018); (16) Murgas et al. (2020); (17) Fu et al. (2020); (18) Parviainen et al. (2018); (19) Nikolov et al. (2018); (20) Evans et al. (2018); (21) Chen et al. (2018); (22) Pearson et al. (2019).

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