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Table 2
Modeled and inferred parameters for the GJ 3470 system.
| Unit | Prior | Posterior | ||
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| Stellar parameters | ||||
| Stellar mass, M⋆ | [M⊙] | 0.541 ± 0.067 | ||
| Stellar radius, R⋆ | [R⊙] | 0.503 ± 0.063 | ||
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| Planetary parameters | ||||
| Orbital period, P | [day] | Jeffreys (Pmin = 3.33, Pmax = 3.34) | 3.33714 ± 0.00017 | |
| Systemic velocity, γ | [km s-1] | Uniform (γmin = + 26, γmax = + 27) | 26.51691 ± 0.00053 | |
| Radial-velocity semi-amplitude, K | [m/s] | Jeffreys (Kmin = 0.1, Kmax = 100) | 0.00901 ± 0.00075 | |
| Orbital eccentricity, e | [] | Uniform (emin = 0, emax = 0.1) | < 0.051 (1-σ upper limit) | |
| Argument of periastron, ω | [rad] | Uniform (ωmin = 0, ωmax = 2π) | 0 − 2π (unconstrained) | |
| Planet-to-star radius ratio, Rp/R⋆ | [] | Uniform (min = 0, max = 0.1) | 0.0755 ± 0.0031 | |
| Transit depth, D | [mmag] | 5.69 ± 0.47 | ||
| Scaled semi-major axis, a/R⋆ | [] | Uniform (min = 0, max = 100) | 14.9 ± 1.2 | |
| Orbital inclination, i | [rad] | Isotropic spin-orbit (imin = 0, imax = π/2) | > 88.8o (1-σ lower limit) | |
| semi-major axis, a | [AU] | 0.0348 ± 0.0014 | ||
| Transit times | ||||
| Mid transit, Ttr | [day] | 55 953.6645 ± 0.0034 | ||
| First contact, tI | [day] | 55 956.9652 ± 0.0029 | ||
| Second contact, tII | [day] | 55 956.9705 ± 0.0028 | ||
| Third contact, tIII | [day] | 55 957.0325 ± 0.0051 | ||
| Fourth contact, tIV | [day] | 55 957.0378 ± 0.0071 | ||
| Planetary mass, Mp | [M⊕] | 14.0 ± 1.7 | ||
| Planetary radius, Rp | [R⊕] | 4.2 ± 0.6 | ||
| Impact parameter, b | [] | 0.22 ± 0.16 | ||
| Planetary density, ρp | [g/cm3] | 1.07 ± 0.43 | ||
| Planetary surface gravity, gp | [m/s2] | 7.9 ± 1.8 | ||
| Equilibrium temperature | ||||
| Teq, A = 0 | [K] | 615 ± 16 | ||
| Teq, A = 0.75 | [K] | 435 ± 12 | ||
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| Data parameters | ||||
| Radial-velocity time series additive noise | ||||
| for Harps, ϵrv | [m/s] | Modif. Jeffreys (ϵmin = 0, ϵ0 = 0.1, ϵmax = 1000) | < 0.40 (1-σ upper limit) | |
| Photometric time series additive noise | ||||
| for Trappist (2012, Feb. 26), ϵph,1 | [mmag] | Modif. Jeffreys (ϵmin = 0, ϵ0 = 0.1, ϵmin = 1000) | 2.18 ± 0.19 | |
| for Trappist (2012, Mar. 7), ϵph,2 | [mmag] | Modif. Jeffreys (ϵmin = 0, ϵ0 = 0.1, ϵmin = 1000) | 3.51 ± 0.18 | |
| for Euler (2012, Feb. 26), ϵph,3 | [mmag] | Modif. Jeffreys (ϵmin = 0, ϵ0 = 0.1, ϵmin = 1000) | 1.33 ± 0.12 | |
| for Nites (2012, Apr. 12), ϵph,4 | [mmag] | Modif. Jeffreys (ϵmin = 0, ϵ0 = 0.1, ϵmin = 1000) | 0.04 ± 0.04 | |
| Baseline model (y = a + bτ + cτ2, where τ is, for a given time series, the time elapsed since the 1st exposure) | ||||
| for Trappist (2012, Feb. 26), a | 1.000100 ± 0.000461 | |||
| , b | −0.011 ± 0.012 | |||
| , c | 0.097 ± 0.068 | |||
| for Trappist (2012, Mar. 7), a | 0.999810 ± 0.000502 | |||
| , b | −0.003 ± 0.011 | |||
| , c | 0.049 ± 0.053 | |||
| for Euler (2012, Feb. 26), a | 0.998510 ± 0.000355 | |||
| , b | 0.068 ± 0.010 | |||
| , c | −0.487 ± 0.061 | |||
| for Nites (2012, Apr. 12), a | 0.186031 ± 0.000083 | |||
| , b | −0.0058 ± 0.0027 | |||
| , c | 0.302 ± 0.018 | |||
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