Table 1
Polarimetric observations of SN 2008D/XT 080109 and SN 2007uy.
| Datea | Telescope | Exposure | Seeing | SN 2008D/XT 080109 | SN 2007uyb | ||||
| 2008, UT | (+Instrument) | time (s) | (′′) | P ± σP (%) | θ ± σθ (deg) | V ± σVc | P ± σP (%) | θ ± σθ (deg) | V ± σVc |
|
|
|||||||||
| Jan. 13.1644 | NOT(+ALFOSC) | 12 × 600 | 0.7 | 0.95 ± 0.20 | 114.9 ± 5.9 | 18.44 ± 0.05 | – | – | – |
| Jan. 13.2642 | VLT(+FORS1) | 2330d | 1.0 | 0.68 ± 0.22 | 119.2 ± 9.5 | 18.39 ± 0.05 | 1.45 ± 0.25 | 178.6 ± 4.6 | 15.78 ± 0.05 |
| (0.65 ± 0.33)e | (124.5 ± 13.3) | (1.59 ± 0.04) | (177.4 ± 0.7) | ||||||
| Jan. 15.0780 | NOT(+ALFOSC) | 12 × 600 | 0.9 | 0.85 ± 0.28 | 106.1 ± 9.4 | 18.28 ± 0.05 | – | – | – |
| Jan. 17.2518 | VLT(+FORS1) | 8 × 285 | 1.0 | 0.84 ± 0.45 | 138.3 ± 8.1 | 17.90 ± 0.05 | 1.43 ± 0.14 | 182.5 ± 5.1 | 15.69 ± 0.05 |
| (1.14 ± 0.51) | (141.0 ± 7.2) | (1.59 ± 0.04) | (177.4 ± 0.7) | ||||||
| Jan. 30.1858 | VLT(+FORS1) | 4 × 285 | 0.8 | 1.05 ± 0.06 | 135.3 ± 1.7 | 17.31 ± 0.05 | 1.64 ± 0.06 | 178.5 ± 1.1 | 16.39 ± 0.05 |
| (1.11 ± 0.08) | (134.0 ± 2.0) | (1.59 ± 0.04) | (177.4 ± 0.7) | ||||||
| Jan. 30.2022 | VLT(+FORS1) | 4 × 285 | 0.8 | 1.28 ± 0.06 | 132.5 ± 1.4 | 17.27 ± 0.05 | 1.56 ± 0.06 | 176.1 ± 1.1 | 16.36 ± 0.05 |
| (1.21 ± 0.08) | (133.3 ± 1.9) | (1.59 ± 0.04) | (177.4 ± 0.7) | ||||||
| Feb. 11.9326 | CAHA(+CAFOS) | 13 × 400 | 2.0 | 1.58 ± 0.97 | 126.6 ± 16.4 | 17.82 ± 0.09 | 0.92 ± 0.88 | 179.8 ± 26.0 | 17.09 ± 0.11 |
| (1.19 ± 1.51) | (131.6 ± 20.5) | (1.59 ± 0.04) | (177.4 ± 0.7) | ||||||
| Feb. 26.1107 | CAHA(+CAFOS) | 16 × 600 | 1.9 | < 2.76f | – | 18.52 ± 0.09 | 1.81 ± 0.63 | 173.5 ± 14.4 | 17.56 ± 0.08 |
| (< 2.94f ) | – | (1.59 ± 0.04) | (177.4 ± 0.7) | ||||||
| Feb. 26.9444 | NOT(+ALFOSC) | 16 × 400 | 1.3 | 0.98 ± 0.80 | 124.6 ± 23.2 | 18.79 ± 0.08 | – | – | – |
| Mar. 2.1102 | VLT(+FORS1) | 4 × 525 | 1.1 | 1.42 ± 0.46 | 139.0 ± 9.1 | 18.80 ± 0.05 | 1.83 ± 0.19 | 174.6 ± 3.2 | 17.55 ± 0.05 |
| (1.17 ± 0.51) | (134.7 ± 11.4) | (1.59 ± 0.04) | (177.4 ± 0.7) | ||||||
| Mar. 28.0207 | VLT(+FORS1) | 4 × 525 | 1.1 | 0.75 ± 0.57 | 111.2 ± 21.9 | 19.42 ± 0.05 | 1.58 ± 0.42 | 179.6 ± 7.6 | 17.98 ± 0.05 |
| (0.73 ± 0.78) | (112.7 ± 21.0) | (1.59 ± 0.04) | (177.4 ± 0.7) | ||||||
Notes.
For the NOT epochs SN 2007uy was out of the FoV, so the degree of linear polarization (P), the position angle (θ), and the magnitude (V) could not be determined.
Calibration based on Malesani et al. (2009). The photometric errors include the zero point uncertainty.
The polarimetric cycle was interrupted and restarted several times. The SN 2007uy observing epoch and the exposure time are slightly different from the SN 2008D/XT 080109 ones, corresponding to Jan. 13.2708 UT and 990 seconds, respectively.
The SN 2008D/XT 080109P and θ values given for VLT and CAHA in between parentheses assume a constant SN 2007uy polarization given by 〈P〉 = 1.59 ± 0.04% and 〈θ〉 = 177.4 ± 0.7°.
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