A He I upper atmosphere around the warm Neptune GJ 3470 b

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Table 4

Physical planet parameters for GJ 3470b, HAT-P-11 b, and GJ 436 b.

Parameter	GJ 3470 b ⁽¹⁻⁵⁾	HAT-P-11 b ^(5,6)	GJ 436 b ⁽⁷⁻¹⁰⁾
Host sp. type	M2.0 V	K4 V	M2.5 V
Radius [R_Jup]	0.36 ± 0.01	0.389 ± 0.005	0.374 ± 0.009
Mass [M_Jup]	0.036 ± 0.002	0.0736 ± 0.0047	0.0728 ± 0.0024
Density [g cm⁻³]	1.036 ± 0.119	1.658 ± 0.127	1.848 ± 0.163
T_eq [K]	733 ± 23	832 ± 10	686 ± 10
F_EUV [erg s⁻¹ cm⁻²]	1435 ± 80	2109 ± 153	197 ± 9
Age [Gry]	<3	6.5 ± 5.0	6.0 ± 5.0
He (2³S) Absorption [%]	1.5 ± 0.3	1.08 ± 0.05	<0.41

References. ⁽¹⁾ Biddle et al. (2014); ⁽²⁾ Kosiarek et al. (2019); ⁽³⁾ Dragomir et al. (2015); ⁽⁴⁾ this work; ⁽⁵⁾ Yee et al. (2018); ⁽⁶⁾ Allart et al. (2018); ⁽⁷⁾ Alonso-Floriano et al. (2015); ⁽⁸⁾Turner et al. (2016); ⁽⁹⁾Nortmann et al. (2018); ⁽¹⁰⁾Torres et al. (2008).

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