Hot Exoplanet Atmospheres Resolved with Transit Spectroscopy (HEARTS) - VII. Detection of sodium on the long-transiting inflated sub-Saturn KELT-11 b

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Volume 668 (December 2022)

A&A, 668 (2022) A1

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Table 2

Physical and orbital parameters of the KELT-11 system.

Parameter	Symbol (unit)	Value
Stellar parameters
Stellar mass	M_* (M_⊙)	1.44 ± 0.07^(a)
Stellar radius	R_* (R_⊙)	2.69 ± 0.04^(a)
Effective temperature	T_eff (K)	5375 ± 25^(a)
Metallicity	[Fe/H] (dex)	0.17 ± 0.07^(a)
Surface gravity	log g_* (cgs)	3.7 ± 0.1^(a)
Planetary parameters
Planet mass	M_p (M_J)	0.205 ± 0.017^(b)
Planet radius	Rp (R_J)	1.35 ± 0.10^(a)
Equilibrium temperature	Teq (K)	$1712_{- 46}^{+ 51}^{(c)}$ $1712{_{ - 46}^{ + 51}^{\left( c \right)}}$
Surface gravity	log g_p (cgs)	${2.407}_{- 0.086}^{+ 0.080}^{(c)}$ $2.407{_{ - 0.086}^{ + 0.080}^{\left( c \right)}}$
System parameters
Transit epoch	T_c (BJD_TDB)	2455498.95898 ^(b) ± 0.00178
Orbital period	P (d)	4.73620865 ^(b) ± 0.00000377
Transit duration (P₁ to P₄)	T₁₄ (h)	7.10 ± 0.02^(d)
Transit duration (P₂ to P₃)	T₂₃ (h)	6.25 ± 0.02^(d)
Planet-to-star radius ratio	Rp / R_*	0.0519 ± 0.0026^(b)
Orbital semi-major axis	a (AU)	0.06230 ± 0.00104^(b)
Orbit inclination	i (deg)	85.3 ± 0.02^(b)
Eccentricity	e	0 (fixed)^(b)
Stellar RV semi-amplitude	K_* (m s⁻¹)	19.49 ± 1.51^(b)
Planet RV semi-amplitude	K_p (km s⁻¹)	143 ± 11^(e)
Systemic velocity	γ (km s⁻¹)	35.1033 ± 0.0003 ^(e)
Rossiter-McLaughlin parameters
Limb-darkening coefficient	u_{1 Sloan g}	0.695 ± 0.017^(c)
Limb-darkening coefficient	u_{2 Sloan g}	0.117 ± 0.013^(c)
Projected spin-orbit angle	λ (deg)	$- {77.86}_{- 2.26}^{+ 2.36}^{(f)}$ $- 77.86{_{ - 2.26}^{ + 2.36}^{\left( f \right)}}$
Projected rotation velocity	v sin i_* (km s⁻¹)	${1.99}_{- 0.07}^{+ 0.06}^{(f)}$ $1.99{_{ - 0.07}^{ + 0.06}^{\left( f \right)}}$

References. ^(a)Beatty et al. (2017). ^(b)This work (DACE fit with other papers’ priors). ^(c)Pepper et al. (2017). ^(d)Colón et al. (2020). ^(e)This work (fitted separately). ^(f) This work (Rossiter-McLaughlin analysis, see Sect. 6).

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