GG Tauri: the fifth element | Astronomy & Astrophysics (A&A)

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Volume 565 (May 2014)

A&A, 565 (2014) L2

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Table 3

Summary of geometrical model fits to the VLTI-PIONIER data on 2012-10-30 for GG Tau Aa and Ab(1+2), respectively.

GG Tau Aa - models

F_halo/F_tot

F_Ab1/F_tot

F_ring/F_tot

F_excess/F_tot

Θ(ring) [mas]

R(ring) [au]

1- point source+halo

1.4

0.10 ± 0.01

0.90 ± 0.08

–

≥0.11

–

2- point source+halo+ring^a

1.2

0.06 ± 0.01

0.68 (fixed)

0.26 ± 0.08

0.32 (fixed)

1.0 ± 0.2

0.07 ± 0.01

GG Tau Ab1+Ab2 - models

F_halo/F_tot

F_Ab1/F_tot

F_Ab2/F_tot

F_excess/F_tot

(F_Ab1/F_Ab2)_corr

3- 2-point sources^b

1.5

–

0.89 ± 0.15

0.11 ± 0.02

–

4.3 ± 2.0

4- 2-point sources+halo

2.2

0.19 ± 0.03

0.73 ± 0.09

0.08 ± 0.01

≥ 0.19

4.6 ± 1.8

Notes.

^(a)

A circular ring and an elongated ring (with an aspect ratio, an inclination and orientation forced to the known circumbinary ring values) yield similar results.

^(b)

Fit to closure-phase values alone, a single-star model would yield .

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