Table 2
Median values and 68% confidence interval for HD 207897 b and its host star.
| Parameter | Units | Model priors | Activity on 35.9 d (Prob. = 46%) | Activity on 37.6 d (Prob. = 54%) | ||
|---|---|---|---|---|---|---|
| Stellar parameters: | ||||||
| M* | Mass (M⊙) | – |  |
 |
||
| R* | Radius (R⊙) | – |  |
 |
||
| R*,SED | Radius(1) (R⊙) | – |  |
 |
||
| L* | Luminosity (l⊙) | – |  |
 |
||
| FBol | Bolometric Flux (cgs) | – |  |
 |
||
| ρ* | Density (cgs) | – |  |
 |
||
| logg | Surface gravity (cgs) | – |  |
 |
||
| Teff | Effective Temperature (K) |  [5012,80] |
 |
 |
||
| Teff,SED | Effective Temperature(1) (K) | – |  |
 |
||
| [Fe/H] | Metallicity (dex) |  |
 |
 |
||
 |
Initial Metallicity(2) | – |  |
 |
||
| Age | Age (Gyr) | – |  |
7.1 ± 4.5 | ||
| EEP | Equal Evolutionary Phase(3) | – |  |
 |
||
| AV | V-band extinction (mag) |  [0,0.3534] |
 |
 |
||
| σSED | SED photometry error scaling | – |  |
 |
||
| ϖ | Parallax (mas) |  |
 |
35.345 ± 0.047 | ||
| d | Distance (pc) | – | 28.292 ± 0.038 | 28.293 ± 0.038 | ||
 |
RV slope(4) (m s−1/day) | – | − 0.00078 ± 0.00030 |  |
||
| Planetary parameters: | ||||||
| P | Period (days) | – | 16.202157 ± 0.000085 |  |
||
| RP | Radius (RE) | – |  |
 |
||
| MP | Mass (ME) | – | 15.9 ± 1.6 | 14.4 ± 1.6 | ||
| TC | Time of conjunction(5) (BJDTDB) | – |  |
 |
||
| TT | Time of minimum projected separation(6) (BJDTDB) | – |  |
 |
||
| T0 | Optimal conjunction Time(7) (BJDTDB) | – |  |
 |
||
| a | Semi-major axis (AU) | – |  |
 |
||
| i | Inclination (Degrees) | – |  |
88.757 ± 0.067 | ||
| e | Eccentricity | – |  |
 |
||
| ω* | Argument of Periastron (Degrees) | – |  |
− 100 ± 110 | ||
| Teq | Equilibrium temperature(8) (K) | – |  |
 |
||
| τcirc | Tidal circularization timescale (Gyr) | – |  |
 |
||
| K | RV semi-amplitude (m s−1) | – | 4.65 |
4.24 |
||
| RP∕R* | Radius of planet in stellar radii | – |  |
 |
||
| a∕R* | Semi-major axis in stellar radii | – |  |
 |
||
| δ | Transit depth (fraction) | – |  |
 |
||
| Depth | Flux decrement at mid transit | – |  |
 |
||
| τ | Ingress/egress transit duration (days) | – |  |
 |
||
| T14 | Total transit duration (days) | – |  |
 |
||
| TFWHM | FWHM transit duration (days) | – |  |
 |
||
| b | Transit Impact parameter | – |  |
 |
||
| bS | Eclipse impact parameter | – |  |
 |
||
| τS | Ingress/egress eclipse duration (days) | – |  |
 |
||
| TS,14 | Total eclipse duration (days) | – |  |
 |
||
| TS,FWHM | FWHM eclipse duration (days) | – | 0.1143 ± 0.0015 | 0.1143 ± 0.0016 | ||
| δS,2.5μm | Blackbody eclipse depth at 2.5μm (ppm) | – |  |
 |
||
| δS,5.0μm | Blackbody eclipse depth at 5.0μm (ppm) | – |  |
 |
||
| δS,7.5μm | Blackbody eclipse depth at 7.5μm (ppm) | – |  |
 |
||
| ρP 3 | Density (cgs) | – | 5.52 |
5.05 |
||
| log gP | Surface gravity | – | 3.393 |
3.353 |
||
| Θ | Safronov Number | – | 0.0647 |
0.0589 |
||
| ⟨F⟩ | Incident Flux (109 erg s−1 cm−2) | – |  |
 |
||
| TP | Time of Periastron (BJDTDB) | – |  |
 |
||
| TS | Time of eclipse (BJDTDB) | – |  |
 |
||
| TA | Time of Ascending Node (BJDTDB) | – |  |
 |
||
| TD | Time of Descending Node (BJDTDB) | – |  |
 |
||
| Vc ∕Ve | – |  |
 |
|||
| e cos ω* | – |  |
 |
|||
| e sin ω* | – |  |
 |
|||
| MP sin i | Minimum mass (ME) | - | 15.8 ± 1.6 | 14.4 ± 1.6 | ||
| MP ∕M* | Mass ratio | – | 0.0000594 ± 0.0000058 | 0.0000540 ± 0.0000058 | ||
| d∕R* | Separation at mid transit | – |  |
 |
||
| PT | A priori non-grazing transit prob | - |  |
 |
||
| PT,G | A priori transit prob | – |  |
 |
||
| PS | A priori non-grazing eclipse prob | – |  |
 |
||
| PS,G | A priori eclipse prob | – |  |
 |
||
| Stellar activity parameters: | ||||||
| PActivity | Period (days) | – | 35.923 |
37.627 |
||
| TC,activity | Time of conjunction(5) (BJDTDB) | – | 2458917.1 ± 2.2 | 2458910.7 |
||
| eActivity | Eccentricity | – |  |
 |
||
| ω*, activity | Argument of Periastron (Degrees) | – | -127 |
33 |
||
| KActivity | RV semi-amplitude (m s−1) | – |  |
 |
||
| Telescope parameters for SOPHIE: | ||||||
| γrel | Relative RV Offset(4) (m s−1) | – | − 6327.36 ± 0.56 | − 6327.53 ± 0.52 | ||
| σJ | RV Jitter (m s−1) | – |  |
 |
||
 |
RV Jitter Variance | – |  |
 |
||
| Telescope parameters for APF: | ||||||
| γrel | Relative RV Offset(4) (m s−1) | – | 3.1 ± 1.1 |  |
||
| σJ | RV Jitter (m s−1) | – |  |
 |
||
 |
RV Jitter Variance | – |  |
 |
||
| Telescope parameters for HIRES: | ||||||
| γrel | Relative RV Offset(4) (m s−1) | – |  |
 |
||
| σJ | RV Jitter (m s−1) | – | 2.15 |
2.42 |
||
 |
RV Jitter Variance | – |  |
 |
||
| Wavelength parameters: | TESS | TESS | ||||
| u1 | linear limb-darkening coeff | – | 0.386 ± 0.046 |  |
||
| u2 | quadratic limb-darkening coeff | – | 0.188 ± 0.048 |  |
||
| Transit prameters: | TESS UT 2019-10-10 (TESS) | TESS UT 2019-10-10 (TESS) | ||||
| σ2 | Added Variance | – | 0.0000000244 ± 0.0000000011 | 0.0000000244 ± 0.0000000011 | ||
| F0 | Baseline flux | – |  |
 |
||
Notes. Gaussian priors are presented by 
where a and b are the mean and width, respectively. Likewise, the uniform prior is denoted by
and c and d present bounds on the parameter. The two solutions correspond to two possibilities for the stellar activity period. The highlighted parameters present a difference exceeding 0.5 σ between thetwo solutions. See Table 3 in Eastman et al. (2019) for a detailed description of all parameters. (1) This value ignores the systematic error and is for reference only. (2)The metallicity of the star at birth. (3)Corresponds to static points in a star’s evolutionary history. See Sect. 2 in Dotter (2016). (4) Reference epoch = 2456438.359500. (5) Time of conjunction is commonly reported as the “transit time”. (6)Time of minimum projected separation is a more correct “transit time”. (7) Optimal time of conjunction minimizes the covariance between TC and Period. (8)Assumes no albedo and perfect redistribution.
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