Fresh view of the hot brown dwarf HD 984 B through high-resolution spectroscopy

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Volume 686 (June 2024)

A&A, 686 (2024) A294

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Table 5

Comparison of the spectrum retrievals for HD 984 B.

Model	C/O	[Fe/H]	log(¹²CO/¹³CO)	ln(B)
Clear	${0.49}_{- 0.01}^{+ 0.01}$ $0.49_{ - 0.01}^{ + 0.01}$	$- {0.57}_{- 0.02}^{+ 0.02}$ $- 0.57_{ - 0.02}^{ + 0.02}$	${2.06}_{- 0.07}^{+ 0.09}$ $2.06_{ - 0.07}^{ + 0.09}$	0
Gray opacity cloud	${0.50}_{- 0.01}^{+ 0.01}$ $0.50_{ - 0.01}^{ + 0.01}$	$- {0.62}_{- 0.02}^{+ 0.02}$ $- 0.62_{ - 0.02}^{ + 0.02}$	${2.03}_{- 0.08}^{+ 0.07}$ $2.03_{ - 0.08}^{ + 0.07}$	−0.6
EddySed (Al₂O₃, cd)	${0.49}_{- 0.01}^{+ 0.01}$ $0.49_{ - 0.01}^{ + 0.01}$	$- {0.55}_{- 0.02}^{+ 0.02}$ $- 0.55_{ - 0.02}^{ + 0.02}$	${2.04}_{- 0.06}^{+ 0.07}$ $2.04_{ - 0.06}^{ + 0.07}$	1.0
EddySed (Al₂O₃ + MgSiO₃, cd)	${0.52}_{- 0.01}^{+ 0.01}$ $0.52_{ - 0.01}^{ + 0.01}$	$- {0.47}_{- 0.07}^{+ 0.07}$ $- 0.47_{ - 0.07}^{ + 0.07}$	${1.92}_{- 0.06}^{+ 0.03}$ $1.92_{ - 0.06}^{ + 0.03}$	−2.2
EddySed (MgSiO₃ + Fe, cd)	${0.50}_{- 0.01}^{+ 0.01}$ $0.50_{ - 0.01}^{ + 0.01}$	$- {0.62}_{- 0.02}^{+ 0.02}$ $- 0.62_{ - 0.02}^{ + 0.02}$	${1.99}_{- 0.13}^{+ 0.08}$ $1.99_{ - 0.13}^{ + 0.08}$	3.3
EddySed (Al₂O₃ + MgSiO₃ + Fe, cd)	${0.50}_{- 0.01}^{+ 0.01}$ $0.50_{ - 0.01}^{ + 0.01}$	$- {0.63}_{- 0.02}^{+ 0.03}$ $- 0.63_{ - 0.02}^{ + 0.03}$	${1.97}_{- 0.17}^{+ 0.19}$ $1.97_{ - 0.17}^{ + 0.19}$	2.2

Additional retrieval without 13CO

Clear without ¹³CO	${0.49}_{- 0.01}^{+ 0.01}$ $0.49_{ - 0.01}^{ + 0.01}$	$- {0.56}_{- 0.02}^{+ 0.02}$ $- 0.56_{ - 0.02}^{ + 0.02}$	–	−7.8
EddySed (MgSiO₃ + Fe, cd) without ¹³CO	${0.49}_{- 0.01}^{+ 0.01}$ $0.49_{ - 0.01}^{ + 0.01}\quad$	$- {0.56}_{- 0.01}^{+ 0.02}$ $- 0.56_{ - 0.01}^{ + 0.02}$	–	−7.1

Notes. Comparison of some of the retrieved parameters obtained using clear and cloudy models. The rightmost column lists the measured Bayes factor for each retrieval, with the clear model as the baseline model with ln(B) = 0. We adopted the EddySed (MgSiO₃ + Fe, cd) model as our best-fit model since it shows the highest Bayes factor.

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