Table 2.
Simulated BD photometric transit statistics as a function of period bin.
| 5-yr nominal (Pdistr = Ma & Ge) |
10-yr extended (Pdistr = Ma & Ge) |
|||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Period bin | ≥1 transit (S/N > 3) |
≥3 transits (S/N > 3) |
≥1 transit (S/N > 3) |
≥3 transits (S/N > 3) |
||||||||
| [day] |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
| 1–1826 | 7800 | 250 | 2.5 | 12 000 | 690 | 4.5 | 7800 | 190 | 4.0 | 9300 | 350 | 5.9 |
| 1–2 | 300 | 15 | 4.1 | 330 | 22 | 5.3 | 300 | 15 | 7.9 | 310 | 16 | 8.4 |
| 2–4 | 640 | 25 | 3.1 | 840 | 49 | 4.6 | 640 | 22 | 5.5 | 680 | 28 | 6.5 |
| 4–8 | 1500 | 43 | 2.2 | 2700 | 140 | 3.9 | 1500 | 36 | 3.8 | 1800 | 57 | 5 |
| 8–16 | 4100 | 97 | 1.9 | 9700 | 460 | 3.8 | 4000 | 68 | 2.7 | 5600 | 150 | 4.2 |
| 16–32 | 9500 | 200 | 1.6 | 37 000 | 1600 | 3.5 | 9400 | 120 | 2.1 | 19 000 | 460 | 3.8 |
| 32–64 | 21 000 | 440 | 1.6 | 82 000 | 3900 | 3.8 | 22 000 | 250 | 1.8 | 58 000 | 1300 | 3.6 |
| 64–128 | 56 000 | 1100 | 1.6 | 200 000 | 9000 | 3.6 | 56 000 | 630 | 1.8 | 160 000 | 3800 | 3.8 |
| 128–256 | 140 000 | 2700 | 1.6 | 500 000 | 21 000 | 3.3 | 150 000 | 1500 | 1.5 | 1 100 000 | 28 000 | 3.8 |
| 256–512 | 590 000 | 12 000 | 1.6 | 3 600 000 | 180 000 | 4.0 | 340 000 | 3700 | 1.7 | 1 200 000 | 27 000 | 3.6 |
| 512–1024 | 540 000 | 11 000 | 1.5 | 4 200 000 | 210 000 | 4.0 | 1 000 000 | 10 000 | 1.5 | 4 000 000 | 100 000 | 4.0 |
| 1024–1826 | 1 400 000 | 32 000 | 1.8 | 5 000 000 | 190 000 | 3.0 | 1 900 000 | 18 000 | 1.5 | 10 000 000 | 190 000 | 3.0 |
Notes. Photometric transit statistics as a function of period for the ‘all-magnitudes’ simulation using Pdistr = Ma & Ge (irrespective of astrometric and radial velocity detectability and sky orientation). Only sources with ≥3 transits and S/N > 3 are considered in the final analyses of this paper (Table 1). Here, 
is the fraction of selected transiting observations with respect to the total number of observations, and 
is the fraction of sources with selected transiting observations, both for randomly oriented systems. For sources that have selected transiting observations, 
is the mean number of transits per source. E.g. see the top row on the left: for a nominal mission with all simulated orbital periods (between 1 to 1826 days): 1 in 7800 observations is a transit, and 1 in 250 sources has transiting observations with on average 2.5 transits per source. The following rows provide numbers in specific period ranges showing that transits become increasingly less likely for longer orbital periods. The numbers in the bottom three period bins are particularly poorly defined because of their low occurrence rates in the simulated data.
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