Table 1
Properties and our observing setup of the brown dwarfs 2M0355 and 2M1425.
| Parameter | 2M0355 | 2M1425 |
|---|---|---|
| Spectral type (optical/IR) | L5γ (a)/L4γ (b) | L3 (c)/L4γ (d) |
| Radius (RJup) | 1.20 ± 0.04 (d) | 1.23 ± 0.01 (d) |
| Mass (MJup) | ![$\[23_{-5}^{+2}{ }^{(e)}\]$](/articles/aa/full_html/2025/06/aa54195-25/aa54195-25-eq8.png) |
![$\[22_{-8}^{+3}{ }^{(e)}\]$](/articles/aa/full_html/2025/06/aa54195-25/aa54195-25-eq9.png) |
| Effective temperature (K) | 1478 ± 57 (f) | 1535 ± 55 (f) |
| Surface gravity (cgs) | 4.67 ± 0.05 (d) | 4.64 ± 0.04 (d) |
| Radial velocity (km/s) | 11.92 ± 0.22 (d) | 5.37 ± 0.25 (g) |
| Rotational velocity (km/s) | <4 (h) | 32.37 ± 0.66 (g) |
| Age (Myr) | 125 (e) | 125 (e) |
| Distance (pc) | 9.16 ± 0.04 (i) | 11.85 ± 0.04 (i) |
| KS (mag) | 11.53 ± 0.02 (j) | 11.81 ± 0.03 (j) |
| Observation date | 2022-11-02 | 2023-02-01 |
| Slit width (″) | 0.2 | 0.4 |
| Exposure time (min) | 50 | 60 |
| Seeing (″) | 0.73 ± 0.03 | 0.72 ± 0.03 |
| Airmass | 1.42 ± 0.05 | 1.13 ± 0.04 |
| Integrated water vapor (mm) | 1.29 ± 0.01 | 13.66 ± 0.04 |
| Signal-to-noise ratio | 30 | 40 |
Notes. References: (a)Cruz et al. (2009), (b)Bardalez Gagliuffi et al. (2019), (c)Reid et al. (2008), (d)Gagné et al. (2015a), (e)Aller et al. (2016), (f)Filippazzo et al. (2015), (g)Blake et al. (2010), (h)Zhang et al. (2021b), (i)Gaia Collaboration (2020), (j)Cutri et al. (2003).
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