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Title:
The 3D shape of Type IIb SN 2011hs
Authors:
Stevance, H. F.; Maund, J. R.; Baade, D.; Bruten, J.; Cikota, A.; Höflich, P.; Wang, L.; Wheeler, J. C.; Clocchiatti, A.; Spyromilio, J.; Patat, F.; Yang, Y.; Crowther, P.
Affiliation:
AA(Department of Physics and Astronomy, University of Sheffield, Hounsfield Rd, Sheffield S3 7RH, UK 0000-0002-0504-4323), AB(Department of Physics and Astronomy, University of Sheffield, Hounsfield Rd, Sheffield S3 7RH, UK 0000-0003-0733-7215), AC(European Organisation for Astronomical Research in the Southern Hemisphere (ESO), Karl-Schwarzschild-Str. 2, D-85748 Garching b. München, Germany), AD(Department of Physics and Astronomy, University of Sheffield, Hounsfield Rd, Sheffield S3 7RH, UK), AE(Physics Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA 0000-0001-7101-9831), AF(Department of Physics, Florida State University, Tallahassee, FL 32306-4350, USA), AG(George P. and Cynthia Woods Mitchell Institute for Fundamental Physics and Astronomy, Texas A&M University), AH(Department of Astronomy and McDonald Observatory, The University of Texas at Austin, Austin, TX 78712, USA 0000-0003-1349-6538), AI(Institute of Astrophysics, Universidad Católica de Chile, and Millennium Institute of Astrophysics, Santiago, Chile), AJ(European Organisation for Astronomical Research in the Southern Hemisphere (ESO), Karl-Schwarzschild-Str. 2, D-85748 Garching b. München, Germany), AK(European Organisation for Astronomical Research in the Southern Hemisphere (ESO), Karl-Schwarzschild-Str. 2, D-85748 Garching b. München, Germany), AL(Department of Particle Physics and Astrophysics, Weizmann Institute of Science, Rehovot 76100, Israel), AM(Department of Physics and Astronomy, University of Sheffield, Hounsfield Rd, Sheffield S3 7RH, UK)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 485, Issue 1, p.102-116 (MNRAS Homepage)
Publication Date:
05/2019
Origin:
OUP
Astronomy Keywords:
techniques: polarimetric, supernovae: general, supernovae: individual: SN 2011hs
Abstract Copyright:
2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
DOI:
10.1093/mnras/stz265
Bibliographic Code:
2019MNRAS.485..102S

Abstract

We observed seven epochs of spectropolarimetry in optical wavelengths for the Type IIb SN 2011hs, ranging from -3 to +40 d with respect to V-band maximum. A high degree of interstellar polarization was detected (up to ˜3 per cent), with a peak lying blueward of 4500 Å. Similar behaviours have been seen in some Type Ia supernovae (SNe), but had never been observed in a Type IIb. We find that it is most likely the result of a relative enhancement of small silicate grains in the vicinity of the SN. Significant intrinsic continuum polarization was recovered at -3 and +2 d (p = 0.55 ± 0.12 per cent and 0.75 ± 0.11 per cent, respectively). We discuss the change of the polarization angle across spectral lines and in the continuum as diagnostics for the 3D structure of the ejecta. We see a gradual rotation by about -50° in the continuum polarization angle between -2 and +18 d after V-band maximum. A similar rotation in He I lambda5876, Halpha and the Ca II infrared triplet seems to indicate a strong influence of the global geometry on the line polarization features. The differences in the evolution of their respective loops on the Stokes q - u plane suggest that line specific geometries are also being probed. Possible interpretations are discussed and placed in the context of literature. We find that the spectropolarimetry of SN 2011hs is most similar to that of SN 2011dh, albeit with notable differences.
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