V892 Tau: A tidally perturbed circumbinary disc in a triple stellar system

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Table 3

Model functions for the tilt and the PA evolution and best-fit results for i30, i60, and ei60.

	Tilt
	$Δ (t) = a_{1} + a_{2} e^{- a_{3} t} \cos (2 π a_{4} t + a_{5})$ $\Delta (t) = {a_1} + {a_2}{e^{ - {a_3}t}}\cos \left( {2\pi {a_4}t + {a_5}} \right)$

Setup	i30	i60	ei60
a₁ (°)	5.71 ± 0.10	8.21 ± 0.05	3.47 ± 0.11
a₂ (°)	6.03 ± 0.62	−6.06 ± 0.22	−19.59 ± 9.00
$a_{3} (10^{- 2} P_{out}^{- 1})$ ${a_3}\left( {{{10}^{ - 2}}P_{{\rm{out }}}^{ - 1}} \right)$	1.10 ± 0.31	−0.44 ± 0.11	5.32 ± 1.27
$a_{4} (10^{- 2} P_{out}^{- 1})$ ${a_4}\left( {{{10}^{ - 2}}P_{{\rm{out }}}^{ - 1}} \right)$	6.77 ± 0.05	5.19 ± 0.02	9.84 ± 0.15
a₅	−5.18 ± 0.10	4.71 ± 0.03	1.96 ± 0.33
	Position Angle
	Ω(t) = a₁ + a₂t + a₃ cos(2πa₄t + a₅)

Setup	i30	i60	ei60

b₁ (°)	50.77 ± 0.53	52.80 ± 0.20	52.12 ± 0.57
$b_{2} (^{°} P_{out}^{- 1})$ ${b_2}\left( {^^\circ P_{{\rm{out }}}^{ - 1}} \right)$	−0.22 ± 0.02	−0.39 ± 0.01	−0.36 ± 0.02
b₃ (°)	−4.24 ± 0.19	5.04 ± 0.07	3.10 ± 0.15
$b_{4} (10^{- 2} P_{out}^{- 1})$ ${b_4}\left( {{{10}^{ - 2}}P_{{\rm{out }}}^{ - 1}} \right)$	6.57 ± 0.08	4.78 ± 0.02	9.77 ± 0.10
b₅	−3.82 ± 0.18	8.53 ± 0.04	−9.89 ± 0.27

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