Table 4: Results from geometric model fits.
Parameters CPD1 CPD2 CPD3
Face-on monochromatic models
Uniform ring :      
Radius $r_{\rm in}$ (mas) 73 $\pm$ 4 65 $\pm$ 4 40 $\pm$ 4
Width w (mas) 22 $\pm$ 3 22 $\pm$ 3 20 $\pm$ 3
$F_{\rm ring}$/ $F_{\rm tot}$ 0.28 $\pm$ 0.05 0.19 $\pm$ 0.05 0.31 $\pm$ 0.05
$\chi ^2$/d.o.f. 4.2 3.9 11.5
Gaussian ring :      
$r_{\frac{1}{2}\rm {FWHM}}$ (mas) 87 $\pm$ 6 91 $\pm$ 6 23 $\pm$ 20
$\chi ^2$/d.o.f. 7.8 11.5 198
Inclined monochromatic models

Gaussian ring :

      
$r_{\frac{1}{2}\rm {FWHM}}$ (mas) 75 $\pm$ 3 70 $\pm$ 3 73 $\pm$ 3
Pos. Angle (deg) -10 $\pm$ 5 -10 $\pm$ 5 -21 $\pm$ 9
Incl. i (deg) 30 $\pm$ 5 26 $\pm$ 5 29  $\pm$ 5
$\chi ^2$/d.o.f. 4.3 1.8 14.3
Inclined polychromatic models

Blackbody model :

      
Radius rf (mas) 75 70 73
Pos. Anglef (deg) -10 -10 -21
Incl.f i (deg) 30 26 29
$T_{\max}$ (K) 1000 $\pm$ 200 1000 $\pm$ 200 1000 $\pm$ 200
$\alpha$ 2.3 $\pm$ 0.1 2.3 $\pm$ 0.1 2.3 $\pm$ 0.1
$\chi ^2$/d.o.f. 2.5 3.4 11.8

f: fixed parameter during fitting process.

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