Table 1
Details of the four data sets that we use throughout this paper.
| Dataset | Beta Pictoris L′ | Beta Pictoris M′ | HR 8799 L′ | R CrA L′ |
|---|---|---|---|---|
| Target star | Beta Pictoris | Beta Pictoris | HR 8799 | R Coronae Australis |
| Observation date | 2013-02-01 | 2012-11-26 | 2011-09-01 | 2018-06-07 |
| ESO Program ID | 60.A-9800(J) | 090.C-0653(D) | 087.C-0450(B) | 1101.C-0092(A) |
| Original reference | Absil et al. (2013) | Bonnefoy et al. (2013) | – (0) | Cugno et al. (2019) |
| Instrument | VLT/NACO | VLT/NACO | VLT/NACO | VLT/NACO |
| Filter / central wavelength | L′ (3.80µm) | M′ (4.78 µm) | L′ (3.80 µm) | L′ (3.80 µm) |
| Pixel scale (arc sec / pixel) | 0.0271 | 0.0271 | 0.0271 | 0.0271 |
| λ/D (arc sec)(1) | 0.0956 | 0.1202 | 0.0956 | 0.0956 |
| Coronagraph | AGPM | – | – | AGPM |
| DIT [science/PSF] (s) | 0.2/0.020197 | 0.065/0.1(2) | 0.2/0.2(2) | 0.1082/0.004256 |
| FWHM of PSF (pixel) | 4.24 | 4.97 | 4.10 | 4.19 |
| Stack size(3) | 29 681 × 185 × 185 | 52126 × 111 × 111 | 21043 × 167 × 167 | 16751 × 223 × 223 |
| Field rotation (°) | 83.3 | 51.8 | 32.5 | 121.2 |
| Separation (mas)(4) | b:  |
b:  |
– (5) | b: 186.7 ± 1.1 |
| Position angle (°)(4) | b: 210.26 ± 0.11 | b:  |
– (5) | b: 132.0 ± 0.2 |
| Contrast (mag)(4) | b: 7.85 ± 0.06 | b: 7.64 ± 0.12 | – (5) | b: 6. 48 ± 0. 01 |
Notes. (0)Data set previously unpublished.(1)Computed using the central wavelength for λ and D = 8.2 m for the diameter of the primary mirror. (2)PSF frames used a neutral density filter (ND_Long) with a transmission of 2.21 ± 0.07% in the L′ and 2.33 ± 0.10% in the M′ band; see Table A.2 in Bonnefoy et al. (2013).(3)Format: number of frames (after frame selection) × frame width in pixels × frame height in pixels.(4) Values obtained using MCMC with PCA-based PSF subtraction. The values for Beta Pictoris L′/M′ are taken from Stolker et al. (2019); the values for R CrA L′ are taken from Cugno et al. (2019).(5) No published values available for this data set.
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