Impact of a new H/He equation of state on the evolution of massive brown dwarfs - New determination of the hydrogen burning limit

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Volume 671 (March 2023)

A&A, 671 (2023) A119

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Table 2.

Effective temperature, luminosity and radius of the various BDs examined in the text obtained with the P2020 and present models for the observed masses and ages.

Object		M [M_Jup]	Age [Gyr]	T_eff [K]	log(L/L_⊙)	R/R_⊙
HD4113C	Observations^(1, 8)	66±5	5	500–600	−6.30 ± 0.22
	P2020	63	5	1108	−5.06	0.080
		66		1149	−4.99	0.080
	Present	63	5	1081	−5.11	0.079
		66		1144	−5.02	0.079
Eps Indi Ba	Observations⁽²⁾	66.92±0.36	3.5
	Observations⁽⁵⁾	68±0.9		1312±9	−4.70±0.02
	P2020	66–67	3.0	1324–1395	−4.72 − −4.63	0.083
			3.5	1262–1325	−4.81 − −4.73	0.082
			3.8	1233–1293	−4.85 − −4.78	0.081
	Present	66–67	2.8	1321–1354	−4.74 − −4.70	0.081
			3.0	1291–1321	−4.78 − −4.74	0.081
			3.5	1241–1265	−4.86 − −4.83	0.080
Eps Indi Bb (or C)	Observations⁽²⁾	53.25±0.29	3.5
	Observations⁽⁵⁾	53±0.3		975±11	−5.23±0.02
	P2020	53	3.0	1071	-5.08	0.084
			3.5	1023	−5.17	0.083
			3.8	996	−5.21	0.083
	Present	53	2.8	1060	−5.10	0.083
			3.0	1042	−5.13	0.083
			3.5	998	−5.22	0.083
			3.8	973	−5.26	0.082
GL 758 B	Observations⁽³⁾	42 ( > 30)	1–6 (older?)	650	−6.07±0.03
	Observations⁽⁴⁾		≳6
	P2020	37	5	680	−5.84	0.087
			8	600	−6.07	0.086
	Present	37	5	673	−5.86	0.087
			8	593	−6.09	0.085
WISE J0720−0846B	Observations⁽⁶⁾	66±4	> a few	1250±40	−4.82±0.07
	P2020	66	3	1324	−4.72	0.082
			4	1216	−4.88	0.082
	Present	66	3	1291	−4.78	0.081
			4	1201	−4.92	0.080
2M0805+48	Observations⁽⁷⁾	66	≥4
2M1059−21	Observations⁽⁷⁾
	P2020	66	5	1149	−4.99	0.080
			10	964	−5.33	0.077
	Present	66	5	1142	−5.02	0.079
			10	975	−5.33	0.076
Gliese 229 B	Observations⁽⁸⁾	71.4 ± 0.6	< 10		−5.208 ± 0.007
	P2020	70.5	8	1171	−4.99	0.078
			9	1140	−5.04	0.077
			10	1109	−5.09	0.077
	Present	70.5	8	1133	−5.06	0.077
			9	1103	−5.11	0.076
			10	1075	−5.16	0.076
		71.5	10	1110	−5.10	0.076

Notes. ⁽¹⁾Cheetham et al. (2018), ⁽²⁾Chen et al. (2022), ⁽³⁾Bowler et al. (2018), ⁽⁴⁾Brandt et al. (2019), ⁽⁵⁾Cardoso (2012), ⁽⁶⁾Dupuy et al. (2019), ⁽⁷⁾Sahlmann et al. (2020), ⁽⁸⁾Brandt et al. (2021). Models are Phillips et al. (2020, P2020) and present calculations. We have taken 1 M_Jup = 9.5 × 10⁻⁴ M_⊙ in the evolutionary models.

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