The GAPS programme at TNG - XXX. Atmospheric Rossiter-McLaughlin effect and atmospheric dynamics of KELT-20b

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Volume 649 (May 2021)

A&A, 649 (2021) A29

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Table 1

Physical and orbital parameters of the KELT-20 system (also known as MASCARA-2 or HD 185603).

Parameter	Symbol	Value
Stellar parameters

Spectral type ⁽¹⁾		A2
V -band magnitude ⁽²⁾	m_V	7.6
Effective temperature ⁽³⁾	T_eff	K

Projected rotation speed ⁽⁴⁾	vsini_⋆	116.23 ± 1.25 km s⁻¹

Linear limb darkening ⁽¹⁾	u

Surface gravity ⁽³⁾	log g	4.31 ± 0.02 cgs
Metallicity ⁽³⁾	[Fe/H]	−0.02 ± 0.07 dex
Stellar mass ⁽³⁾	M_⋆

Stellar radius ⁽³⁾	R_⋆	1.60 ± 0.06 R_⊙
Rotation period ⁽⁴⁾	p_⋆	0.695 ± 0.027 days

Planetary parameters

Planet mass ⁽¹⁾	M_p	<3.51 M_Jup
Planet radius ⁽³⁾	R_p	1.83 ± 0.07 R_Jup

Planet-to-star ratio ⁽¹⁾	R_p∕R_⋆

Planet-to-star ratio ⁽³⁾	R_p∕R_⋆	0.115 ± 0.002
Equilibrium temperature ⁽³⁾	T_eq	2260 ± 50 K
Surface gravity ⁽¹⁾	log g_p	<3.46 cgs
Overall Fe volume mixing ratio (solar value) ⁽⁵⁾	logVMR_Fe	−4.27 cgs

Orbital parameters

Epoch ⁽³⁾	T_P	BJD

Period ⁽³⁾	P	days

Transit duration ⁽¹⁾	T_dur	days

Semi-major axis ⁽¹⁾	a	au

Inclination ⁽¹⁾	i	deg

Eccentricity	e	0 (fixed)
Projected obliquity ⁽³⁾	λ	0.6 ± 4 deg
Stellar RV amplitude ⁽⁶⁾	K_s	322.51 m s⁻¹
Systemic velocity ⁽¹⁾	V_Sys	− 23.3 ± 0.3 km s⁻¹
Systemic velocity ⁽³⁾	V_Sys	− 21.3 ± 0.4 km s⁻¹
Systemic velocity ⁽⁷⁾	V_Sys	− 22.06 ± 0.35 km s⁻¹
Systemic velocity ⁽⁴⁾	V_Sys	− 24.48 ± 0.04 km s⁻¹

References. ⁽¹⁾ Lund et al. (2017); ⁽²⁾ Høg et al. (2000); ⁽³⁾ Talens et al. (2018); ⁽⁴⁾ this work; ⁽⁵⁾ Asplund et al. (2009); ⁽⁶⁾ Casasayas-Barris et al. (2019); ⁽⁷⁾Nugroho et al. (2020).

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