2007ApJ...671.1944M


Query : 2007ApJ...671.1944M

2007ApJ...671.1944M - Astrophys. J., 671, 1944-1958 (2007/December-3)

Spectropolarimetry of the type IIb supernova 2001ig.

MAUND J.R., WHEELER J.C., PATAT F., WANG L., BAADE D. and HOFLICH P.A.

Abstract (from CDS):

We present spectropolarimetric observations of the Type IIb SN 2001ig in NGC 7424; conducted with the ESO VLT FORS1 on 2001 December 16, 2002 January 3, and 2002 August 16, or 13, 31, and 256 days postexplosion. These observations are at three different stages of the SN evolution: (1) the hydrogen-rich photospheric phase, (2) the Type II to Type Ib transitional phase, and (3) the nebular phase. At each of these stages, the observations show remarkably different polarization properties as a function of wavelength. We show that the degree of interstellar polarization is 0.17%. The low intrinsic polarization (∼0.2%) at the first epoch is consistent with an almost spherical (<10% deviation from spherical symmetry) hydrogen-dominated ejecta. Similar to SN 1987A and to Type IIP SNe, a sharp increase in the degree of the polarization (∼1%) is observed when the outer hydrogen layer becomes optically thin by day 31; only at this epoch is the polarization well described by a ``dominant axis.'' The polarization angle of the data shows a rotation through ∼40° between the first and second epochs, indicating that the asymmetries of the first epoch were not directly coupled with those observed at the second epoch. For the most polarized lines, we observe wavelength-dependent loop structures in addition to the dominant axis on the Q-U plane. We show that the polarization properties of Type IIb SNe are roughly similar to one another, but with significant differences arising due to line blending effects especially with the high velocities observed for SN 2001ig. This suggests that the geometry of SN 2001ig is related to SN 1993J and that these events may have arisen from a similar binary progenitor system.

Abstract Copyright:

Journal keyword(s): Stars: Supernovae: General - supernovae: individual (SN 2001ig) - Techniques: Polarimetric

Simbad objects: 19

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Number of rows : 19
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 SN 2002ap SN* 01 36 23.85 +15 45 13.2   13.11 14.54     SNIc-BL 536 1
2 SN 2004dt SN* 02 02 12.3 -00 06 02           SNIa 134 1
3 SN 2001el SN* 03 44 30.60 -44 38 23.4   12.81       SNIa 254 1
4 GD 50 WD* 03 48 50.1859724280 -00 58 32.290187664 12.596 13.787 14.063 14.210 14.388 DA1.2 250 1
5 SN 2003bg SN* 04 10 59.43 -31 24 50.4     15.0     SNIc 140 1
6 SN 1999em SN* 04 41 27.04 -02 51 45.2   13.79 13.7     SNIIP 635 1
7 SN 1987A SN* 05 35 28.020 -69 16 11.07           SNIIpec 4738 2
8 HD 49798 HXB 06 48 04.7001531360 -44 18 58.436036028 6.758 8.017 8.287 8.391 8.543 sdO6 307 0
9 2MASS J07371703+6535579 HXB 07 37 17.0432126424 +65 35 57.826001220           SNIIP 253 1
10 SN 1993J SN* 09 55 24.77476 +69 01 13.7026   10.8 12.0     SNIIb 1344 1
11 SN 1996cb SN* 11 03 41.98 +28 54 13.7   14.22       SNIIb 104 1
12 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6316 0
13 SN 1987K SN* 12 43 41.17 +16 23 44.9     14.2     SNIIb: 143 1
14 SN 1997X SN* 12 48 14.28 -03 19 58.5   14.75 13.5     SNIb 65 1
15 CD-38 10980 WD* 16 23 33.8380498896 -39 13 46.161043572 9.916 10.885 11.029 10.936 10.841 DA2 466 0
16 NGC 7424 GiG 22 57 18.3924511080 -41 04 14.124670032   10.88 10.38 10.02 10.9 ~ 207 0
17 SN 2001ig SN* 22 57 30.69 -41 02 25.9     14.5     SNIIb 159 1
18 EGGR 264 WD* 23 19 35.3881861344 -17 05 28.465573380 13.279 14.132 14.111 14.07 14.049 DB3 114 0
19 NAME Cas A SNR 23 23 24.000 +58 48 54.00     14.30     ~ 2629 1

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2022.09.26-15:12:24

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