Table 2
Effects of the initial gas surface density
| Scaled surface | Success | Mean mass | Mean mass |
| density | fraction | innermost | 2nd innermost |
|
|
|||
| 0.4Σgas | 21% | 10.5 (24–6) | 8.7 (24–6) |
| 0.75Σgas | 33% | 15.7 (30–6) | 9.5 (18–6) |
| 1.0Σgas [fiducial] | 42% | 18 (36–6) | 11.3 (24–6) |
| 1.5Σgas | 37% | 21.5 (42–6) | 11.4 (24–6) |
| 3.0Σgas | 27% | 26.7 (48–12) | 12.7 (24–6) |
Notes. From left to right the columns are the scaled surface density, fraction of simulations forming Uranus and Neptune analogs (each core suffered at least one collision, they are both as massive as 12 Earth masses, and their mass ratio is between 1 and 1.5), and the mean masses of the innermost and second innermost planetary cores beyond Saturn. The values in brackets show the range over which the mean values were calculated (compare with Fig. 4).
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