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Table 1
Astrometry of the GG Tau Ab and UX Tau B systems.
| Date | Instrument | Filter | Sep. (″) | PA(°) | Flux ratio | Ref. |
|---|---|---|---|---|---|---|
| GG Tau Ab | ||||||
| 2011/12/16 | Keck/NIRC2 | Brγ | 0.0305±0.0015 | 246.8±1.5 | 0.21±0.04 | This work |
| 2012/10/29 | Keck/NIRC2 | K′ | 0.0347±0.0015 | 232.1±1.5 | 0.17±0.04 | This work |
| 2012/10/31 | VLTI/PIONIER | H | 0.0325±0.0004 | 230.0±0.4 | 0.23±0.10 | Di Folco et al. (2014)(†) |
| 2013/10/18 | VLTI/PIONIER | H | 0.0312±0.0004 | 213.2±0.4 | (…) | This work(†) |
| 2014/12/11 | Keck/NIRC2 | K′ | 0.0274±0.0020 | 181.5±2.0 | 0.15±0.03 | This work |
| 2015/12/21 | VLTI/PIONIER | H | 0.0227±0.0003 | 157.3±0.4 | (…) | This work |
| 2019/10/13 | Keck/NIRC2 | Brγ | 0.0315±0.0010 | 252.3±1.0 | 0.22±0.03 | This work |
| UX Tau B | ||||||
| 1997/12/12 | CFHT/AOBIR | K | 0.138±0.002 | 303.9±1.0 | 0.78±0.05 | Duchêne (1999) |
| 1998/11/19 | HST/WFPC2 | F606W | 0.142±0.002 | 302.1±1.0 | 0.50±0.02 | This work |
| 2002/10/22 | VLT/NACO | K | 0.136±0.002 | 309.0±1.0 | 0.81±0.02 | Correia et al. (2006) |
| 2009/10/25 | Keck/NIRC2 | Kc | 0.084±0.002 | 326.9±1.0 | 0.81±0.02 | Schaefer et al. (2014) |
| 2009/12/25 | Gemini/NIRI | Kc | 0.085±0.002 | 327.4±1.0 | 0.78±0.01 | This work |
| 2011/10/12 | Keck/NIRC2 | Kc | 0.056±0.002 | 339.7±1.0 | 0.80±0.01 | Schaefer et al. (2014) |
| 2013/01/27 | Keck/NIRC2 | Kc | 0.032±0.005 | 359.5±8.7 | 0.9±0.4 | Schaefer et al. (2014) |
| 2015/10/25 | VLT/SPHERE | H | 0.047±0.002 | 259.4±1.0 | 0.82±0.03 | This work |
| 2016/01/01 | VLT/SPHERE | H | 0.046±0.002 | 259.1±1.0 | 0.83±0.04 | This work |
| 2016/09/17 | VLT/SPHERE | H | 0.057±0.002 | 264.9±1.0 | 0.82±0.02 | This work |
| 2016/10/15 | VLT/SPHERE | Kc | 0.061±0.003 | 269.0±1.0 | 0.83±0.01 | This work |
| 2017/10/12 | VLT/SPHERE | H | 0.070±0.002 | 272.8±1.0 | 0.79±0.03 | This work |
Notes. (†)Only the most plausible solutions from these epochs are listed here (see Sect. 2.2). The flux ratio of the GG Tau Ab pair could not be determined in the new PIONIER data due to the contamination by the nearby GG Tau Aa component.
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