Open Access

Table A.2

Calcium fitting priors.

Parameter Prior Comment
β U (0.5, 3.0)
τ1 U (4.0, 15.0) Main disk line component.
τ2 U (0.0, 3.0) Exocomet.
τ3 U (0.0, 4.0) Secondary disk line.
τ4 U (0.0, 2.0) Blended line (only night two).
λ1 (nm) U (393.390, 393.410) H-line center.
λ2 (nm) U (393.347, 393.370)
λ3 (nm) U (393.380, 393.395)
λ4 (nm) U (393.341, 393.346)
σ1 (km/s) U (1.5, 7.0)
σ2 (km/s) U (2.0, 12.0)
σ3 (km/s) U (1.0, 5.0)
σ4 (km/s) U (2.0, 8.0)
f1 U (0.5, 1.0)
f2 U (0.0, 1.0)
f3 U (0.2, 1.0)
f4 U (0.0, 1.0)
dλ1 (nm) U (3.47, 3.481) λ shift of K-line in order 7.
dλ2 (nm) U (3.47, 3.481) λ shift of K-line in order 8.
c0 U (0.0, 2.0)
c1 U (−0.1, 0.0) Negative slope.
c2 U (−0.001, 0.001)

Notes. Priors used when fitting the Ca II line doublet in the two 2019 nights, describing three line components occurring in four wavelength slices. The priors on polynomial coefficients ci are the same for all four slices and are not repeated in the table.

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