Table 1
Observed and inferred stellar parameters for GJ 3470.
| Spectral type | M1.5 | R97 | ||
| Distance, d | [pc] | 25.2 ± 2.9 | Lep05 | |
| Stellar photometry | ||||
| V | [mag] | 12.27 ± 0.02 | R01 | |
| J | [mag] | 8.794 ± 0.019 | Cu03 | |
| H | [mag] | 8.206 ± 0.023 | Cu03 | |
| K | [mag] | 7.989 ± 0.023 | Cu03 | |
| Stellar absolute magnitudes | ||||
| MV | [mag] | 10.26 ± 0.57 | ||
| MK | [mag] | 5.98 ± 0.58 | ||
| Bolometric correction, BCK | [mag] | 2.59 | via Leg01 | |
| Luminosity, L⋆ | [L⊙] | 0.029 ± 0.002 | ||
| Mass, M⋆ | [M⊙] | 0.45 ± 0.11 | via D00 | |
| Radius, R⋆ | [R⊙] | 0.42 ± 0.10 | via B98 | |
| Effective temperature, Teff | [K] | 3600 ± 200 | via B98 | |
| Galactic velocities, (U,V,W) | [km s-1] | (+29, −12, −10) | ||
| Age, τ | [Gyr] | 0.3–3 | ||
| Limb-darkening coefficients | Cl00 | |||
| z′ filter : ua, ub | 0.40, 0.19 | |||
| V filter : ua, ub | 0.38, 0.40 | |||
Notes. Note that the stellar mass and radii are also constrained by the data of this paper and that posterior values are given in Table 2. R97: Reid et al. (1997); Lep05: Lépine & Shara (2005); R01: Rapaport et al. (2001); Cu03: Cutri et al. (2003); Leg01: Leggett et al. (2001); D00: Delfosse et al. (2000); B98: Baraffe et al. (1998); H97: Haywood et al. (1997); Cl00: Claret (2000).
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