TOI-6508 b: A massive transiting brown dwarf orbiting a low-mass star

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Volume 696 (April 2025)

A&A, 696 (2025) A44

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Table 5

Derived physical parameters of the TOI-6508 b system with 1-σ for the eccentric orbit solution.

TOI-6508

Parameter	Value
Quadratic Limb-Darkening coefficients

u_1,TESS	0.32 ± 0.02
u_2,TESS	0.23 ± 0.03
$u_{1, Pan - STARRS - z_{s}}$ ${u_{1,{\rm{Pan}} - {\rm{STARRS}} - {{\rm{z}}_{\rm{s}}}}}$	0.29 ± 0.02
$u_{2, Pan - STARRS - z_{s}}$ ${u_{2,{\rm{Pan}} - {\rm{STARRS}} - {{\rm{z}}_{\rm{s}}}}}$	0.19 ± 0.04
u_1,Sloan-i′	0.43 ± 0.01
u_2,Sloan-i′	0.30 ± 0.01
u_1,Sloan-r′	0.70 ± 0.01
u_2,Sloan-r′	0.19 ± 0.01
u_{1,Johnson–V}	0.73 ± 0.01
u_{2,Johnson–V}	0.19 ± 0.01

Derived stellar parameters

Stellar mass, M_★ (M_⊙)	${0.1744}_{- 0.0198}^{+ 0.0203}$ $0.1744_{ - 0.0198}^{ + 0.0203}$
Stellar radius, R_★ (R_⊙)	${0.2041}_{- 0.0061}^{+ 0.0061}$ $0.2041_{ - 0.0061}^{ + 0.0061}$
Mean density, ρ_★ (ρ_⊙)	${20.38}_{- 2.65}^{+ 3.36}$ $20.38_{ - 2.65}^{ + 3.36}$
Luminosity, L_★ (L_⊙)	${0.003044}_{- 0.000319}^{+ 0.000353}$ $0.003044_{ - 0.000319}^{ + 0.000353}$
Effective temperature, T_eff (K)	$3003_{- 69}^{+ 71}$ $3003_{ - 69}^{ + 71}$

Derived BD parameters

Radius ratio R_p/R_★	${0.5036}_{- 0.0030}^{+ 0.0037}$ $0.5036_{ - 0.0030}^{ + 0.0037}$
Orbital period P (days)	${18.99265922}_{- 0.0000681}^{+ 0.0000688}$ $18.99265922_{ - 0.0000681}^{ + 0.0000688}$
Transit-timing T₀	10399.8462781 ± 0.0000685
(BJD_TDB – 2450 000)
Orbital semi-major axis a (AU)	0.08659 ± 0.00296
Impact parameter b (R_★)	${0.631}_{- 0.044}^{+ 0.039}$ $0.631_{ - 0.044}^{ + 0.039}$
Transit duration W (min)	109.2 ± 0.5
Scaled semi-major axis a/R_★	${90.96}_{- 3.65}^{+ 4.53}$ $90.96_{ - 3.65}^{ + 4.53}$
Orbital inclination i (deg)	89.60 ± 0.04
Eccentricity e	${0.28}_{- 0.08}^{+ 0.09}$ $0.28_{ - 0.08}^{ + 0.09}$
$\sqrt{e} cos (w)$ $\sqrt e \cos (w)$	${0.35}_{- 0.20}^{+ 0.17}$ $0.35_{ - 0.20}^{ + 0.17}$
$\sqrt{e} sin (w)$ $\sqrt e \sin (w)$	${0.375}_{- 0.093}^{+ 0.068}$ $0.375_{ - 0.093}^{ + 0.068}$
RV semi-amplitude K (km/s)	${14.88}_{- 0.69}^{+ 1.05}$ $14.88_{ - 0.69}^{ + 1.05}$
Mass ratio M_BD/M_★	${0.397}_{- 0.062}^{+ 0.053}$ $0.397_{ - 0.062}^{ + 0.053}$
BD Radius R_BD (R_Jupiter)	${1.026}_{- 0.032}^{+ 0.031}$ $1.026_{ - 0.032}^{ + 0.031}$
BD Mass M_BD (M_Jupiter)	${72.53}_{- 5.09}^{+ 7.61}$ $72.53_{ - 5.09}^{ + 7.61}$
BD density ρ_BD (g/cm³)	${89.0}_{- 8.2}^{+ 13.7}$ $89.0_{ - 8.2}^{ + 13.7}$
Surface gravity log g_BD	${5.2469}_{- 0.0338}^{+ 0.0535}$ $5.2469_{ - 0.0338}^{ + 0.0535}$
Incident flux < F > (< F_⊕ >)	${0.407}_{- 0.051}^{+ 0.055}$ $0.407_{ - 0.051}^{ + 0.055}$

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