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Table 4

Fitted disk centroid positions.

Object Telescope Epoch α δ Δα, Δδ p.m. (α) p.m. (δ)
(UT) (J2000.0) (J2000.0) mas mas/yr mas/yr

AS 209 2000.0 16 49 15.30324 14 22 08.6346 7.69 22.84
SMA 2006-05-12 16 49 15.282 14 22 08.77 0.005
CARMA 2009-12-10 16 49 15.303 14 22 08.853 0.005
VLA 2011-05-20 16 49 15.298 -14 22 08.914 0.005
DR Tau 2000.0 04 47 06.209 +16 58 42.81 12.6 17.1
CARMA 2011-12-06 04 47 06.219 +16 58 42.711 0.002
VLA 2012-08-08 04 47 06.217 +16 58 42.652 0.006
FT Tau 2000.0 04 23 39.193 +24 56 14.11 10.3 21.4
CARMA 2008-10-15 04 23 39.193 +24 56 14.003 0.002
VLA 2011-03-28 04 23 39.196 +24 56 13.977 0.004

Notes. For each object we give the astrometric coordinates at the reference Epoch 2000.0 with proper motion estimates from SIMBAD. For each interferometric dataset we give the coordinate of the disk center derived from the fit, with the estimated errors (Δα and Δδ are found to be approximately equal). These are the formal uncertainties of the fitting process and do not account for the uncertainties introduced by the phase calibration (position accuracy of the calibrator and potentially uncorrected phase offsets); we estimate that they contribute at the 0.1′′ level for our observations.

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