Quadrant polarization parameters for the scattered light of circumstellar disks - Analysis of debris disk models and observations of HR 4796A

Open Access

Table 1

Measured relative quadrant polarization parameters for HR 4796A, deviations Δ (in %) from left–right symmetry and ratios Λ for back–front flux ratios.

Stokes Q_d quadrants
Relative quadrant polarization (errors: ≈ ± 0.010)
	− 0.04 ^(a)	− 0.031
	+ 0.385	+ 0.212
	− 0.076 ^(b)	− 0.159
	+ 0.343	+ 0.033
Quadrant sums (errors: ≈ ± 0.030)
	+ 0.652 ^(c)	+ 0.055
	0.804 ^(c)	0.435
Left–right asymmetry parameters
	+ 6 ± 2%	+ 14 ± 4%
		− 3 ± 23%
Back–front parameter ratios
	<0.6	0.15 ± 0.07
		0.21 ± 0.09
Special back–front parameter ratios
Λ_a = (\|Q₀₉₀\| + \|Q₂₇₀\|)∕(2 \|Q₁₈₀\|)		4.8 ± 0.7
Λ_b = (\|Q₀₉₀\| + \|Q₂₇₀\|)∕(\|U₁₃₅\| + \|U₂₂₅\|)		2.0 ± 0.2

Notes. ^(a)Strongly affected by noise, the expected signal is |Q₀₀₀| < 0.01; ^(b)errors: ≈ ± 0.020; ^(c)Q₀₀₀ is not included in ΣQ_xxx.

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