2007ApJ...671.1944M


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.16CEST11:22:59

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 - 2021
#notes
1 SN 2002ap SN* 01 36 23.85 +15 45 13.2   13.11 14.54     SNIc-BL 509 1
2 SN 2004dt SN* 02 02 12.342 -00 06 02.10   15.33       SNIa 126 1
3 SN 2001el SN* 03 44 30.60 -44 38 23.4   12.81       SNIa 243 1
4 GD 50 WD* 03 48 50.1861716368 -00 58 32.290158840 12.596 13.787 14.063 14.210 14.388 DA1.2 240 0
5 SN 2003bg SN* 04 10 59.42 -31 24 50.3     15.0     SNIc 128 1
6 SN 1999em SN* 04 41 27.04 -02 51 45.2   13.79 13.7     SNIIP 600 1
7 SN 1987A SN* 05 35 28.020 -69 16 11.07           SNIIpec 4578 2
8 HD 49798 HXB 06 48 04.7000758397 -44 18 58.432035331 6.758 8.017 8.287 8.391 8.543 sdO6 288 0
9 2MASS J07371703+6535579 HXB 07 37 17.0439241104 +65 35 57.815731387           SNIIP 243 1
10 SN 1993J SN* 09 55 24.77476 +69 01 13.7026   10.8 12.0     SNIIb 1286 1
11 SN 1996cb SN* 11 03 41.98 +28 54 13.7   14.22       SNIIb 95 1
12 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 6011 0
13 SN 1987K SN* 12 43 41.17 +16 23 44.9     14.2     SNIIb: 141 1
14 SN 1997X SN* 12 48 14.28 -03 19 58.5   14.75 13.5     SNIb 64 1
15 CD-38 10980 WD* 16 23 33.8384178546 -39 13 46.160032569 9.916 10.885 11.029 10.936 10.841 DA2 446 0
16 NGC 7424 GiG 22 57 18.3921716643 -41 04 14.121758456   10.88 10.38 10.02 10.9 ~ 198 0
17 SN 2001ig SN* 22 57 30.69 -41 02 25.9     14.5     SNIIb 148 1
18 EGGR 264 WD* 23 19 35.3881040214 -17 05 28.468265988 13.279 14.132 14.111 14.07 14.049 DB3 111 0
19 NAME Cas A SNR 23 23 24.000 +58 48 54.00     14.30     ~ 2488 1

    Equat.    Gal    SGal    Ecl

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