Table 5.
Solutions for Gaia19bld microlensing event, derived using different data sets.
| 2*Parameter | Ground-based+Gaia | Ground-based+Gaia | Ground-based+Gaia+Spitzer | Ground-based+Gaia+Spitzer |
|---|---|---|---|---|
| u0 > 0 | u0 < 0 | u0 > 0 | u0 < 0 | |
| t0,par [days] | 2458680.0 | 2458680.0 | 2458680.0 | 2458680.0 |
| t0 [days] | 2458681.210 ± 0.001 | 2458681.220 ± 0.001 | 2458681.208 ± 0.001 | 2458681.219 ± 0.001 |
| u0 | 0.0193 ± 0.0001 | −0.0193 ± 0.0001 | 0.0190 ± 0.0001 | −0.0192 ± 0.0001 |
| tE [days] | 106.17 ± 0.55 | 106.76 ± 0.57 | 107.60 ± 0.46 | 107.06 ± 0.50 |
| πEN | −0.0303 ± 0.0056 | −0.0334 ± 0.0056 | −0.0415 ± 0.0010 | −0.0378 ± 0.0012 |
| πEE | −0.0684 ± 0.0024 | −0.0713 ± 0.0024 | −0.0757 ± 0.0012 | −0.0731 ± 0.0014 |
| ρ | 0.03219 ± 0.00018 | 0.03211 ± 0.00018 | 0.03171 ± 0.00015 | 0.03202 ± 0.00016 |
| χ2 | 3068 | 3058 | 3134 | 3082 |
Notes. The difference Δχ2 50 between positive and negative u0 scenarios points towards the latter. In addition, the interferometric measurements from C21 unambiguously determine the u0 parameter to be negative, thus we adopt this solution as the real one.
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