Spectropolarimetry of Type II supernovae: I. Sample, observational data, and interstellar polarization
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Astronomy & Astrophysics, Volume 678
Abstract
We investigate the polarization spectra of hydrogen-rich core-collapse supernovae (Type II SNe). The polarization signal from SNe contains two independent components: intrinsic SN polarization and interstellar polarization (ISP). From these components, we can study the SN explosion geometry and the dust properties in their host galaxies or in the Milky Way. In this first paper, we employ a newly improved method to investigate the properties of the ISP components of 11 well-observed Type II SNe. Our analyses revealed that 10 of these 11 SNe showed a steady ISP component with a polarization degree of 2;1.0%, while one SN was consistent with zero ISP. As for the wavelength dependence, SN 2001dh (and possibly SN 2012aw) showed a non-Milky-Way-like ISP likely originating from the interstellar dust in their respective host galaxies: their polarization maxima were located at short wavelengths (2;4000 ). Similar results have been obtained previously for highly reddened SNe. The majority of the SNe in our sample had uncertainties in the wavelength dependence of their ISP components that were too large for further consideration. Our work demonstrates that further investigation of the ISP component of the SN polarization, by applying this method to a larger SN sample, can provide new opportunities to study interstellar dust properties in external galaxies.Description
Funding Information: We thank the anonymous referee for the comments, which substantially improved this paper. We are grateful to Stefan Taubenberger for the photometric and spectroscopic data of SN 2007aa and useful comments on the manuscript. We also thank Ferdinando Patat, Dietrich Baade, Aleksandar Cikota, Santiago González-Gaitán, Keiichi Maeda, Masaomi Tanaka and Mattia Bulla for useful discussions. This work is based on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere (ESO) under programmes 099.D-0543, 91.D-0401(A), 089.D-0515(A), 085.D-0391, 081.D-0128(A), 082.D-0151(A) and 67.D-0517(A). This research has made use of the services of the ESO Science Archive Facility. This work is based partly on observations collected at the Centro Astronómico Hispano en Andalucía (CAHA) at Calar Alto, operated jointly by Junta de Andalucía and Consejo Superior de Investigaciones Científicas (IAA-CSIC), under program F07_2.2_15. T.N. was funded by the Academy of Finland project 328898. H.K. was funded by the Academy of Finland projects 324504 and 328898. S.M. was funded by the Academy of Finland project 350458. This research has made use of NASA’s Astrophysics Data System Bibliographic Services. Publisher Copyright: © 2023 Authors. All rights reserved.
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Nagao, T, Mattila, S, Kotak, R & Kuncarayakti, H 2023, 'Spectropolarimetry of Type II supernovae: I. Sample, observational data, and interstellar polarization', Astronomy & Astrophysics, vol. 678, A43. https://doi.org/10.1051/0004-6361/202346713