Time-resolved absorption of six chemical species with MAROON-X points to a strong drag in the ultra-hot Jupiter TOI-1518 b

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Volume 698 (May 2025)

A&A, 698 (2025) A314

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Table A.2

Median values and 68% confidence interval for the TOI-1518 system.

Parameter	Units	Values
Stellar Parameters:		TOI-1518
M_*..	Mass (M_⊙).............	${1.88}_{- 0.12}^{+ 0.13}$ $1.88_{-0.12}^{+0.13}$
R_*..	Radius (R_⊙).............	1.942 ± 0.043
L_*..	Luminosity (L_⊙)...........	${9.64}_{- 0.65}^{+ 0.69}$ $9.64_{-0.65}^{+0.69}$
ρ_*..	Density (cgs)............	${0.3622}_{- 0.0054}^{+ 0.0055}$ $0.3622_{-0.0054}^{+0.0055}$
log g.	Surface gravity (cgs).........	4.136 ± 0.011
T_eff.	Effective Temperature (K)......	$7299_{- 100}^{+ 98}$ $7299_{-100}^{+98}$
[Fe/H]	Metallicity (dex)..........	−0.10 ± 0.12
Planetary Parameters:		TOI-1518b
P..	Period (days)............	1.90261131 ± 0.00000043
R_P..	Radius (R_Jup)............	1.878 ± 0.042
M_P.	Mass (M_Jup)............	1.83 ± 0.47
T_T..	Time of transit (BJD _TDB).......	2458787.04943 ± 0.00028
T₀..	Optimal conjunction Time (BJD _TDB).	2459983.791942 ± 0.000066
a..	Semi-major axis (AU)........	0.03712 ± 0.00082
i...	Inclination (degrees).........	77.626 ± 0.097
T_eq.	Equilibrium temperature (K).....	$2546_{- 36}^{+ 35}$ $2546_{-36}^{+35}$
τ_circ.	Tidal circularization timescale (Gyr).	0.0059 ± 0.0015
K..	RV semi-amplitude (m/s)......	$192_{- 49}^{+ 48}$ $192_{-49}^{+48}$
R_P/R_*.	Radius of planet in stellar radii....	${0.09939}_{- 0.00051}^{+ 0.00052}$ $0.09939{}_{-0.00051}^{+0.00050}$
a/R_*..	Semi-major axis in stellar radii....	${4.109}_{- 0.020}^{+ 0.021}$ $4.109_{-0.020}^{+0.021}$
δ..	Transit depth (fraction).......	0.00988 ± 0.00010
Depth	Flux decrement at mid transit....	0.00988 ± 0.00010
τ..	Ingress/egress transit duration (days).	${0.03562}_{- 0.00069}^{+ 0.00071}$ $0.03562_{-0.00069}^{+0.00071}$
T₁₄.	Total transit duration (days).....	${0.09978}_{- 0.00033}^{+ 0.00034}$ $0.09978_{-0.00033}^{+0.00034}$
T_FWHM	FWHM transit duration (days)....	${0.06415}_{- 0.00079}^{+ 0.00081}$ $0.06415_{-0.00079}^{+0.00081}$
b..	Transit Impact parameter......	${0.8806}_{- 0.0027}^{+ 0.0025}$ $0.8806_{-0.0027}^{+0.0025}$
δ_{S, 2.5 μm}	Blackbody eclipse depth at 2.5 μm (ppm)	1378 ± 24
δ_{S, 5.0 μm}	Blackbody eclipse depth at 5.0 μm (ppm)	$2271_{- 25}^{+ 26}$ $2271_{-25}^{+26}$
δ_{S, 7.5 μm}	Blackbody eclipse depth at 7.5 μm (ppm)	$2633_{- 26}^{+ 27}$ $2633_{-26}^{+27}$
ρ_P..	Density (cgs)............	${0.343}_{- 0.088}^{+ 0.087}$ $0.343_{-0.088}^{+0.087}$
log g_P	Surface gravity...........	${3.110}_{- 0.13}^{+ 0.097}$ $3.110_{-0.13}^{+0.097}$
Θ..	Safronov Number..........	${0.0385}_{- 0.0098}^{+ 0.0097}$ $0.0385_{-0.0098}^{+0.0097}$
〈 F 〉..	Incident Flux (10⁹ erg s⁻¹ cm⁻²)...	${9.54}_{- 0.52}^{+ 0.53}$ $9.54_{-0.52}^{+0.53}$
T_S..	Time of eclipse (BJD_TDB)......	2458788.00074 ± 0.00028
T_A..	Time of Ascending Node (BJD_TDB)..	2458788.47639 ± 0.00028
T_D..	Time of Descending Node (BJD _TDB).	2458787.52509 ± 0.00028
M_P/M_*.	Mass ratio.............	0.00093 ± 0.00024
d/R_*..	Separation at mid transit.......	${4.109}_{- 0.020}^{+ 0.021}$ $4.109_{-0.020}^{+0.021}$
P_T..	A priori non-grazing transit prob...	${0.2192}_{- 0.0011}^{+ 0.0012}$ $0.2192_{-0.0011}^{+0.0012}$
P_{T, G}.	A priori transit prob.........	0.2676 ± 0.0013
Wavelength Parameters:		TESS
u₁..	linear limb-darkening coeff.....	${0.165}_{- 0.034}^{+ 0.035}$ $0.165_{-0.034}^{+0.035}$
u₂..	quadratic limb-darkening coeff....	0.326 ± 0.035
Telescope Parameters:		FIES	SOPHIE
γ_rel.	Relative RV Offset (m/s).......	$- 14787_{- 53}^{+ 52}$ $-14787_{-53}^{+52}$	$- 11708_{- 58}^{+ 57}$ $-11708_{-58}^{+57}$
σ_J..	RV Jitter (m/s)...........	${0.00}_{- 0.00}^{+ 110}$ $0.00_{-0.00}^{+110}$	$172_{- 53}^{+ 66}$ $172_{-53}^{+66}$
σ_J²..	RV Jitter Variance.........	$- 16000_{- 17000}^{+ 29000}$ $-16000_{-17000}^{+29000}$	$30000_{- 16000}^{+ 27000}$ $30000_{-16000}^{+237000}$
Transit Parameters:		TESS long cadence	TESS short cadence
σ²..	Added Variance..........	${0.000000234}_{- 0.000000026}^{+ 0.000000031}$ $0.000000234_{-0.000000026}^{+0.00000031}$	${0.0000000225}_{- 0.0000000059}^{+ 0.0000000060}$ $0.0000000225_{-0.0000000059}^{+0.000000060}$
F₀..	Baseline flux............	1.0017 ± 0.0044	${1.0004}_{- 0.0014}^{+ 0.0018}$ $1.0004_{-0.0014}^{+0.0018}$

Notes. See Table 3 in Eastman et al. (2019) for a detailed description of all parameters.

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