Table 1
Adopted values for the orbital and physical parameters of the KELT-9 system.
| Parameter | Value (a) |
|---|---|
| Star: KELT-9 (HD 195689) | |
| V mag | 7.55 |
| Spectral type | B9.5-A0 V |
| M⋆ | 1.978 ± 0.023 M⊙(b) |
| R⋆ | 2.178 ± 0.011 R⊙(b) |
| ρ⋆ | 0.2702 ± 0.0029 g cm−3 (b) |
| Teff | 9 600 ± 400 K (c) |
| log g⋆ | 4.058 ± 0.010 cgs (b) |
| v sin i* Spectro | 112.60 ± 0.04 km s−1 (d) |
| v sin i* RM (SB) | 122.5 ± 0.6 km s−1 (d) |
| v sin i* RM (DR) | 116.9 ± 1.8 km s−1 (d) |
| Transit | |
| T0 | 2 457 095.68572 ± 0.00014 BJDtdb |
| P | 1.4811235 ± 0.0000011 d |
 |
0.00677 ± 0.000072 |
| ΔT1-4 | 3.91584 ± 0.00384 h |
| b | 0.177 ± 0.014 R⋆ |
| a | 0.0346 ± 0.001 au |
| i | 86.79° ± 0.25° |
| λ SB | − 85.65 ± 0.09° (d) |
| λ DR | − 85.01 ± 0.23° (d) |
| linear LD u1 | 0.35 (adopted) |
| Radial velocity | |
| K1 = K⋆ | 276 ± 79 m s−1 |
| K2 = Kp | 234.24 ± 0.90 km s−1 (b) |
| e | 0 (adopted) |
| ω | 90° (adopted) |
| γ | − 17 740 ± 40 m s−1 (b) |
| Planet: KELT-9 b (HD 195689b) | |
| Mp | 2.44 ± 0.70 MJ (b) |
| Rp | 1.783 ± 0.009 RJ (b) |
| ρp | 0.53 ± 0.15 g cm−3 (d) |
| gsurf | 1990 ± 600 cm s−2 (d) |
| Teq | 4360 ± 200 K (e) |
| H0 | 1400 ± 400 km (e) |
 |
150 ± 50 ppm (e) |
Notes. (a) The parameters and errors are initially taken or computed from the extended data table 3 in Gaudi et al. (2017). (b) Updated values from Hoeijmakers et al. (2019). (c)Updated values from Borsa et al. (2019). (d)Updated values from this work. (e)For the planetary equilibrium temperature Teq and the lower atmosphere scale-height H0, we assume an albedo A = 0, a redistribution factor f = 1 and a mean molecular weight μatm = 1.3 (atomic H and He atmosphere). We also consider the planet distance to the stellar surface to be o = a − R⋆.
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