2008ApJ...689.1191T


C.D.S. - SIMBAD4 rel 1.7 - 2020.03.28CET16:58:25

2008ApJ...689.1191T - Astrophys. J., 689, 1191-1198 (2008/December-3)

Optical spectropolarimetry and asphericity of the type IC SN 2007gr.

TANAKA M., KAWABATA K.S., MAEDA K., HATTORI T. and NOMOTO K.

Abstract (from CDS):

We present an optical spectropolarimetric observation of the Type Ic supernova (SN) 2007gr made with the Subaru Telescope at 21 days after maximum brightness (∼37 days after the explosion). Nonzero polarization as high as ∼3% is observed at the absorption feature of the Ca II IR triplet. The polarization of the continuum light is ∼0.5% if we estimate the interstellar polarization (ISP) component by assuming that the continuum polarization has a single polarization angle. This suggests that the axis ratio of the SN photosphere projected on the sky differs from unity by ∼10%. The polarization angle at the Ca II absorption is almost aligned with that of the continuum light. These features may be understood in the context of a model in which a bipolar explosion with an oblate photosphere is being viewed from a slightly off-axis direction and explosively synthesized Ca near the polar region obscures the light that originates around the minor axis of the SN photosphere. Given the uncertainty in the ISP, however, the polarization data could also be interpreted with a model with an almost spherically symmetric photosphere and a clumpy Ca II distribution.

Abstract Copyright:

Journal keyword(s): Polarization - Stars: Supernovae: General - supernovae: individual (SN 2007gr)

Status at CDS:  

Simbad objects: 14

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Number of rows : 14

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 SN 2002ap SN* 01 36 23.85 +15 45 13.2   13.11 14.54     SNIc-BL 487 1
2 SN 2007gr SN* 02 43 27.98 +37 20 44.7       12.77   SNIc 181 1
3 NGC 1058 Sy2 02 43 30.0247243235 +37 20 28.807743477   12.29 11.75 10.85   ~ 431 0
4 SN 2006aj SN* 03 21 39.670 +16 52 02.27 17.96 19.11 17.40     SNIc-BL 817 1
5 SN 1999em SN* 04 41 27.04 -02 51 45.2   13.79 13.7     SNIIP 573 1
6 BD+52 913 WD* 05 05 30.6182785658 +52 49 51.920797126 10.25 11.44 11.69 11.93 12.108 DA.8 974 0
7 SN 1987A SN* 05 35 28.020 -69 16 11.07   4.75 4.81     SNIIpec 4430 2
8 2MASS J07371703+6535579 HXB 07 37 17.0439241104 +65 35 57.815731387           SNIIP 232 1
9 SN 1997ef SN* 07 57 02.87 +49 33 41.3     16.5     SNIc-BL 247 1
10 SN 2005bf SN* 10 23 56.99 -03 11 29.3     18.0     SNIb 165 1
11 SN 2003dh SN* 10 44 50.030 +21 31 18.15     16.2     SNIcpec 1103 2
12 SN 1998bw SN* 19 35 03.17 -52 50 46.1   14.09       SNIc 1632 2
13 SN 2003gf SN* 22 13 40.94 -21 44 03.3     14.6     SNIc: 11 1
14 SN 1999ex SN* 22 16 07.27 -36 50 53.7   17.35       SNIb 122 2

    Equat.    Gal    SGal    Ecl

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2020.03.28-16:58:25

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