Open Access
Table D.3
Physical parameters of the planetary system HAT-P-21 derived in this work.
| Parameter | Nomen | Unit | This Work | Source | Bakos et al. (2011) |
|---|---|---|---|---|---|
| Stellar parameters | |||||
| Spectra class | G3 | ||||
| Effective temperature | Teff | K | 5699 ± 44 | ||
| 5695 ± 45 | EXOFASTV2 | ||||
| HARPS-N | 5588 ± 80 | ||||
| Metallicity | [Fe/H] |  |
EXOFASTV2 | ||
| HARPS-N | 0.01 ± 0.08 | ||||
| Projected rotational velocity | v sin i* | km s−1 | 3.9 ± 0.9 | RM fit | 3.5 ± 0.5 |
| Luminosity | L* | L⊙ |  |
EXOFASTV2 |  |
| Mass | M* | M⊙ | 0.998 ± 0.035 ± 0.020 | ABSDIM | 0.947 ± 0.042 |
| Radius | R* | R⊙ | 1.248 ± 0.049 ± 0.009 | ABSDIM | 1.105 ± 0.083 |
| Mean density | ρ* | ρ⊙ | 0.513 ± 0.058 | ABSDIM | – |
| Logarithmic surface gravity | log g* | cgs | 4.245 ± 0.033 ± 0.003 | ABSDIM | 4.33 ± 0.06 |
| Equal Evolutionary Phase | EEP |  |
EXOFASTV2 | – | |
| V-band extinction | Av | mag | 0.25 ± 0.12 | EXOFASTV2 | – |
| SED photometry error scaling | σSED |  |
EXOFASTV2 | – | |
| Parallax |  |
mas | 3.519 ± 0.023 | EXOFASTV2 | – |
| Distance | d | pc | 284.2 ± 1.8 | EXOFASTV2 | 254 ± 19 |
| Age | |||||
| Gyr |  |
ABSDIM | 10.2 ± 2.5 | ||
| Rotational period | Prot | day | 15.88 ± 0.02 | TFA | – |
| Transit parameters | |||||
| Sum of the fractional radii | rp + r* | 0.1258 ± 0.0064 | JKTEBOP | – | |
| Ratio of the fractional radii | rp/r* | 0.0931 ± 0.0012 | JKTEBOP | 0.0950 ± 0.0022 | |
| Impact parameter | b | 0.615 ± 0.056 | JKTEBOP |  |
|
| Planetary parameters | |||||
| Mass | Mp | MJup | 4.23 ± 0.15 ± 0.06 | ABSDIM | 4.063 ± 0.161 |
| Radius | Rp | RJup | 1.130 ± 0.056 ± 0.008 | ABSDIM | 1.024 ± 0.092 |
| Mean density | ρp | ρJup | 2.74 ± 0.40 ± 0.02 | ABSDIM |  |
| Surface gravity | gp | m s−2 | 82.1 ± 8.1 | ABSDIM | 95 ± 18 |
| Equilibrium temperature | Teq | K | 1367 ± 27 | ABSDIM | 1283 ± 50 |
| Safronov number | Θ | 0.377 ± 0.021 ± 0.003 | ABSDIM | 0.413 ± 0.038 | |
| Orbital parameters | |||||
| Reference epoch of mid-transit | T0 | BJD(TDB) | 2 454 996.41243(60) | JKTEBOP | 2 454 996.41312(69) |
| Period | Porb | days | 4.12449009 (90) | JKTEBOP | 4.124481 (07) |
| Inclination | i | degree | 86.47 ± 0.50 | JKTEBOP | 87.2 ± 0.7 |
| Semi-major axis | a | au | 0.05037 ± 0.00058 ± 0.00034 | ABSDIM | 0.0494 ± 0.0007 |
| RV-curve semi-amplitude | KA | m s−1 | – | – | 548.3 ± 14.2 |
| Barycentric RV | γ | km s−1 | −53.018 ± 0.005 | RM fit | −53.190 ± 0.090 |
| Projected spin-orbit angle | λ | degree | −0.7 ± 12.5 | RM fit | – |
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