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Table 2.
Detection probabilities for the astrometric signature of Barnard’s Star b, and mass upper limits in case of no detection, for four different detection thresholds, and their association with either the optimistic or the pessimistic single-epoch accuracy of the four astrometric instruments discussed in the main text.
| Tdet | Pdet | mup | Instrument |
|---|---|---|---|
| (μas) | (%) | (M⊕) | (-opt = optimistic; -pes = pessimistic) |
| 300 | 0.1 | 72.6 | VLT-FORS2-pes |
| 100 | 1.0 | 24.3 | Gaia-pes, HST-pes, VLT-FORS2-opt |
| 30 | 10.5 | 7.9 | Gaia-opt, HST-opt, WFIRST-pes |
| 10 | 99.1 | 3.2 | WFIRST-opt |
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