The complex inner disk of the Herbig Ae star HD 100453 with VLTI/MATISSE

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Volume 708 (April 2026)

A&A, 708 (2026) A256

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Table 2

Description of the model parameters.

Parameters	Description
l_a	10-log of the approximate half-light radius: $l_{a} = \log_{10} (\sqrt{r_{r i n g}^{2} + r_{k}^{2}})$ $Mathematical equation: $l_{\rm{a}} = \log_{10}(\sqrt{r_{\rm{ring}}^2 + r_{\rm{k}}^2}) $$
l_kr	10-log of the kernel half-light ratio: $l_{k r} = \log_{10} (r_{k} / r_{r i n g})$ $Mathematical equation: $l_{\rm{kr}} = \log_{10}(r_{\rm{k}} / r_{\rm{ring}})$$
f_Lor	Fraction of the pseudo-Lorentzian versus Gaussian profile in the kernel.
θ_PA	Position angle^a of the ellipse semi-major axis.
e	Ring elongation = 1/cos(φ_inclination).
A_skw	Amplitude of the azimuthal modulation.
θ_skwPA	Position angle^a of the asymmetry.
f_s	Fraction of the total flux originating from the unresolved central star.
f_c	Fraction of the total flux originating from the circumstellar material.
f_h	Fraction of the total flux completely resolved at the shortest baselines of our data, representing a spatially extended emission component (also known as ‘halo’), fixed as f = 1 – f_s – f_c.
k_c	Spectral index of the circumstellar material: $f_{c} (\frac{λ}{λ_{0}})^{k_{c}}$ $Mathematical equation: $f_{\rm{c}}(\frac{\lambda}{\lambda_0})^{k_c}$$ .

Notes. ^(a)Defined as counter-clockwise, i.e. N→E = 0° → 90°.

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