Table 3.
Predicted and observed (Bours et al. 2015; Aros-Bunster et al. 2025) parameters of SDSS J1257+5428.
| Parameter | Observed | Observed | Observed | Predicted | |
|---|---|---|---|---|---|
| (fixed log g = 6) | (fixed log g = 7) | ||||
| Porb (h) | 4.56 | 4.56 | 4.56 | 4.556 | |
| Rcold/Rhot | 4.27 ± 0.09 | 4.21 ± 0.10 | 3.89 ± 0.09 | 3.767 | |
| Total age (Gyr) | ≳4 | ≳4 | ≳4 | 6.017 | |
| Hot WD | |||||
| Teff (K) | 13 030 ± 220 | 12 965 ± 230 | 12 811 ± 240 | 13 117 | |
| M (M⊙) | 1.06 ± 0.05 | 1.04 ± 0.05 | 1.00 ± 0.05 | 1.034 | |
| log g (cm s−2) | 8.73 ± 0.10 | 8.70 ± 0.12 | 8.61 ± 0.14 | 8.68 | |
| R (R⊙) | 0.0074 ± 0.0006 | 0.0077 | |||
| cooling age (Gyr) | 1.0 ± 0.1 | 1.0 ± 0.1 | 0.9 ± 0.1 | 0.951 | |
| Cold WD | |||||
| Teff (K) | 6400 ± 87 | 6395 ± 80 | 6460 ± 80 | 6 606 | |
| M (M⊙) | ≲0.24 | ≲0.24 | ≲0.24 | 0.184 | |
| log g (cm s−2) | 5.26 ± 0.36 | 6.0 | 7.0 | 6.78 | |
| R (R⊙) | 0.032 ± 0.003 | 0.029 | |||
| Cooling age (Gyr) since | 0.951 | ||||
| The onset of the detachment | |||||
Notes. The properties of the cold WD were obtained from the MESA simulations, while those for the hot WD were obtained from the tracks computed by Bédard et al. (2020, thick atmosphere), assuming it was entirely rejuvenated during cataclysmic variable evolution (i.e., its age is zero at the detachment).
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