Unraveling the brown dwarf desert: Four new discoveries and a unifying period-coded picture

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Volume 709 (May 2026)

A&A, 709 (2026) A130

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Table 4

Stellar parameters of the four TESS host stars in our sample derived from the co-added FEROS/PLATOSpec spectra analyzed with iSpec/ARIADNE and supplemented by Gaia DR3 astrometry and broadband photometry.

	TIC 9344899	TIC 52059926	TIC 13344668	TIC 63921468
T_eff (K)	5800 ± 70	4505 ± 70	4491 ± 70	6500 ± 70
[Fe/H] (dex)	0.07 ± 0.05	−0.08 ± 0.05	−0.20 ± 0.05	−0.22 ± 0.05
log g (cgs)	4.39 ± 0.04	4.62 ± 0.02	4.63 ± 0.02	3.85 ± 0.02
v_rot sin i_⋆ (km/s)	2.0 ± 1.5	1.5 ± 1.5	1.5 ± 1.5	11.0 ± 1.5
M_⋆ ( M_⊙)	0.98 ± 0.08	0.73 ± 0.04	0.70 ± 0.03	1.52 ± 0.05
R_⋆ ( R_⊙)	1.06 ± 0.03	0.72 ± 0.02	0.69 ± 0.02	2.35 ± 0.05

	ARIADNE analysis

T_eff(K)	5703 ± 69	4479 ± 52	4444 ± 57	6442 ± 69
[Fe/H]	0.10 ± 0.10	−0.07 ± 0.10	−0.18 ± 0.10	−0.22 ± 0.10
log g	4.38 ± 0.04	4.62 ± 0.03	4.63 ± 0.03	3.86 ± 0.02
L_⋆ (L_⊙)	1.08 ± 0.07	0.19 ± 0.01	0.17 ± 0.01	8.61 ± 0.43

	Other parameters

Spectral type	G3V	K4.5V	K5V	F5V
Age (Gyr)	${6.1}_{- 2.9}^{+ 4.1}$ $Mathematical equation: $6.1_{ - 2.9}^{ + 4.1}$$	${8.2}_{- 5.5}^{+ 5.2}$ $Mathematical equation: $8.2_{ - 5.5}^{ + 5.2}$$	${2.7}_{- 2.2}^{+ 7.8}$ $Mathematical equation: $2.7_{ - 2.2}^{ + 7.8}$$	${2.1}_{- 0.2}^{+ 0.2}$ $Mathematical equation: $2.1_{ - 0.2}^{ + 0.2}$$

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