Volume 527, March 2011
|Number of page(s)||4|
|Published online||02 February 2011|
Letter to the Editor
Asymmetries in the type IIn SN 2010jl⋆
European Organization for Astronomical Research in the Southern Hemisphere
(ESO), Karl-Schwarzschild-Str. 2,
Garching b. München,
2 Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, 85741 Garching b. München, Germany
3 Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Padova, v. Osservatorio n.5, 35122 Padua, Italy
4 Queen’s University, Belfast BT7 1NN, Northern Ireland, UK
5 INAF, Telescopio Nazionale Galileo. Rambla José Ana Fernández Pérez 7, 38712 Breña Baja, TF, Spain
Accepted: 13 January 2011
Aims. We study possible signs of asymmetry in the luminous type IIn SN 2010jl, to obtain independent information about its explosion geometry.
Methods. We performed optical linear spectropolarimetry of SN 2010jl two weeks after the discovery, in the spectral range 3700–8800 Å.
Results. The object exhibits a continuum polarization at a very significant and almost constant level (1.7–2.0%). Distinctive line depolarization is seen at the positions of the strongest emission features, such as Hα and Hβ. This implies that the line forming region is well above the photosphere. The continuum polarization level (1.7–2.0%) indicates a substantial asphericity, of axial ratio ≤ 0.7. The almost complete depolarization seen at Hα is indicative of a very low level of interstellar polarization (≤0.3%). This rules out the presence of relevant amounts of dust in the progenitor environment at the time of our observations. From a polarimetric point of view, SN 2010jl appears to be very similar to the two other well-studied type IIn SNe 1997eg and 1998S, establishing a strong link between members of this class of objects.
Key words: supernovae: general / supernovae: individual: SN 2010jl / dust, extinction / techniques: polarimetric
Based on observations collected at the German-Spanish Astronomical Center, Calar Alto, jointly operated by the Max-Planck-Institut für Astronomie Heidelberg and the Instituto de Astrofisica de Andalucia (CSIC).Also based on observations made with the Italian Telescopio Nazionale Galileo (TNG) operated by the Fundaciòn Galileo Galilei of the Istituto Nazionale di Astrofisica.
© ESO, 2011
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