Table A.3.
Estimated uncertainties of mass measurements using astrometric microlensing with Gaia for multiple background sources.
| # | Name-lens | DR2_ID-source | DR2_ID-Source | DR2_ID-Source | Min | σ Mall | σ Mall/Min | σ M5 − par | σ M5 − par./Min | σ Msig. | σ Msig./Min |
|---|---|---|---|---|---|---|---|---|---|---|---|
| DR2_ID-lens | (2-parameter) | (5-parameter) | (sigma) | M⊙ | M⊙ | % | M⊙ | % | M⊙ | % | |
| 1 | Proxima Cen | 5853498713161902848 | 5853498713162466688 | 5853498713181091840 | 0.12 |
 |
10% |
 |
10% |
 |
10% |
| 5853498713160606720 | 5853498713161549312 | 5853498713161890304 | 5853498640098981888 | ||||||||
| 5853498713160604800 | 5853498713180846720 | ||||||||||
| 5853498644442433280 | 5853498713160651648 | ||||||||||
| 5853498644461348864 | 5853498713180846592 | ||||||||||
| 5853498713160648448 | 5853498713181092224 | ||||||||||
| 5853498713160633088 | 5853498713180840704 | ||||||||||
| 5853498713161549440 | 5853498708818460032 | ||||||||||
| 2 | 5312099874809857024 | 5312099870497937152 | 0.07 |
 |
12% | ||||||
| 5312099874795679488 | |||||||||||
| 3 | Ross 733 | 4516199313384903936 | 4516199313402714368 | 0.43 |
 |
15% |
 |
15% | |||
| 4516199240734836608 | |||||||||||
| 4 | LAWD 37 | 5332606346480229376 | 5332606522595645824 | 0.65 |
 |
16% |
 |
36% | |||
| 5332606522595645952 | 5332606350774082944 | 5332606350771972352 | |||||||||
| 5332606350774081280 | |||||||||||
| 5332606522574285952 | |||||||||||
| 5332606350796954240 | |||||||||||
| 5332606350796955904 | |||||||||||
| 5332606316412235008 | |||||||||||
| 5332606522573342592 | |||||||||||
| 5332606518268141952 | |||||||||||
| 5332606522572755072 | |||||||||||
| 5 | 61 Cyg B | 1872046609337556608 | 1872046605038072448 | 0.55 |
 |
24% |
 |
24% | |||
| 1872046574983497216 | 1872046609336784256 | ||||||||||
| 6 | 61 Cyg A | 1872046609343242368 | 1872047330897752832 | 0.63 |
 |
32% |
 |
53% | |||
| 1872046574983507456 | 1872046609335739648 | ||||||||||
| 1872046605041836928 | |||||||||||
| 1872046609335748736 | |||||||||||
| 7 | L 143-23 | 5254061535052907008 | 5254061535097574016 | 0.12 |
 |
37% |
 |
44% | |||
| 5254061535097566848 | 5254061535052928128 | ||||||||||
| 8 | Innes’ star | 5339892367648234240 | 5339892367683265408 | 0.33 |
 |
47% |
 |
48% | |||
| 5339892367683264384 | |||||||||||
Notes. The table lists the name (Name-Lens) and Gaia DR2 source ID (DR2_ID) of the lens and DR2 source IDs of the background sources. The background sources are grouped into sources where Gaia DR2 only provides the position (2-parameter), sources with a full five-parameter solution (5-parameter), and sources with a five-parameter solution in combination with an expected precision in the along-scan direction better than 0.5 mas (sigma). The assumed mass of the lens is listed in Min, and the expected precisions of the mass determination for the three cases are given in σ Mx, including the uncertainty due to the errors in the input parameters, as well as the percentage in σ Mx/Min, where x indicates the use of all background stars (all), background stars with a five-parameters solution (5-par.), and background stars with expected precision in the along-scan direction better than 0.5 mas (sig.).
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