Temporal and chromatic variation of polarized scattered light in the outer disk of PDS 70

Open Access

Table A.1.

VLT/SPHERE polarimetric imaging data and corresponding observing conditions.

Labels	Epochs	Catg.	Filters	λ_c(Δλ)[nm]	nDIT × DIT	n_cyc	seeing[″]	τ₀[ms]
NR	Mar 01, 2023	Object*	N_R	645.9 (56.7)	2 × 32 s	11	0.40-0.82	8.2-18.3
VBB	Jul 09, 2015	Object*	VBB	735.4 (290.5)	6 × 40 s	7 ^a	0.81-1.56	1.1-2.0
J16	Mar 26, 2016	Object	J + ALC_YJH_S	1245 (240)	2 × 64 s	7 ^b	1.24-2.21	0.9-1.6
		Flux	J + ND_1.0		3 × 4 s	2	1.87-2.39	0.9-1.0
J17	Aug 01, 2017	Object*	J		20 × 2 s	7	0.56-0.77	2.0-3.2
H19	Aug 08, 2019	Object	H + ALC_YJH_S	1625 (290)	1 × 64 s	9	0.39-0.64	2.5-3.4
		Flux	H + ND_1.0		3 × 2 s	1	0.62	2.5
H21	Jul 15, 2021	Object	H		1 × 16 s	12	0.57-0.80	2.5-4.8
		Object*	H + ND_1.0		1 × 0.8375 s	8 ^c	0.57-0.74	2.5-3.8
Ks	Jul 12, 2019	Object	Ks+ n/a ^e	2182 (300)	1 × 64 s	16 ^d	0.39-0.72	2.8-5.4
		Flux	Ks+ ND_1.0		10 × 2 s	2 ^d	0.46-0.60	3.5-4.6

Notes. Columns give the label name, the observing epoch, the observing type category, the used filters, the central wavelength λ and width of the band filter Δλ, the number of detector integration (nDIT) and the detector integration time (DIT), the number of cycles, the seeing, and the coherence time. More specifically, the observing type category includes the flux and object categories. The flux category observes the unsaturated star, without polarimetric cycles. The object category contains 4 polarimetric observations (Q⁺, Q⁻, U⁺, U⁻) in one cycle. The filter column specifies the used band filter, neutral density filter, and coronagraphs. (*) The object frames are not saturated in the center are used for stellar flux integration.

^(a)

17 cycles were taken but 5 cycles failed in centering. 7 best cycles are selected among the 12 cycles based on the Strehl ratio.

^(b)

The last cycle is discarded due to a failure in centering

^(c)

Eight pairs of Q⁺ and Q⁻ measurements, resulting in eight I_Q images.

^(d)

The second part of the observation containing 16 cycles and 1 flux is discarded due to cloudy weather.

^(e)

The observations are executed in polarimetric coronagraphic mode, but the name of the coronagraph is not specified in the header.

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