Time-resolved Polarimetry of the Superluminous SN 2015bn with the Nordic Optical Telescope

We present imaging polarimetry of the superluminous supernova SN 2015bn, obtained over nine epochs between -20 and +46 days with the Nordic Optical Telescope. This was a nearby, slowly evolving Type I superluminous supernova that has been studied extensively and for which two epochs of spectropolari...

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Autores: Leloudas, Giorgos, Maund, J. R., Gal-Yam, Avishay, Pursimo, Tapio, Hsiao, Eric, Malesani, Daniele B., Patat, F., de Ugarte Postigo, A., Sollerman, J., Stritzinger, Maximilian, Wheeler, J.C.
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2017
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/380601
Acceso en línea:http://hdl.handle.net/10261/380601
Access Level:acceso abierto
Palabra clave:Supernovae: general
Supernovae: individual (SN 2015bn)
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spelling Time-resolved Polarimetry of the Superluminous SN 2015bn with the Nordic Optical TelescopeLeloudas, GiorgosMaund, J. R.Gal-Yam, AvishayPursimo, TapioHsiao, EricMalesani, Daniele B.Patat, F.de Ugarte Postigo, A.Sollerman, J.Stritzinger, MaximilianWheeler, J.C.Supernovae: generalSupernovae: individual (SN 2015bn)We present imaging polarimetry of the superluminous supernova SN 2015bn, obtained over nine epochs between -20 and +46 days with the Nordic Optical Telescope. This was a nearby, slowly evolving Type I superluminous supernova that has been studied extensively and for which two epochs of spectropolarimetry are also available. Based on field stars, we determine the interstellar polarization in the Galaxy to be negligible. The polarization of SN 2015bn shows a statistically significant increase during the last epochs, confirming previous findings. Our well-sampled imaging polarimetry series allows us to determine that this increase (from ∼0.54% to ≳1.10%) coincides in time with rapid changes that took place in the optical spectrum. We conclude that the supernova underwent a "phase transition" at around +20 days, when the photospheric emission shifted from an outer layer, dominated by natal C and O, to a more aspherical inner core, dominated by freshly nucleosynthesized material. This two-layered model might account for the characteristic appearance and properties of Type I superluminous supernovae. © 2017. The American Astronomical SocietyWe are grateful to Cosimo Inserra and Mattia Bulla for valuable comments and for sending us integrated V-band polarization values from their spectropolarimetry. A.G.-Y. is supported by the EU/FP7 via ERC grant No. 307260, the Quantum Universe I-Core program by the Israeli Committee for Planning and Budgeting, and the ISF; and by Kimmel and YeS awards. D.M. is partly supported by the Instrument Center for Danish Astrophysics (IDA). A.d.U.P. acknowledges support from a Ramn y Cajal fellowship and project AYA2014-58381-P. M.S. is supported in part by a Sapere Aude Level 2 grant funded by the Danish Agency for Science and Technology and Innovation and by a grant from the Villum foundation. The research of J.C.W. is supported in part by NSF AST-1109801. Based on observations made with the Nordic Optical Telescope, operated by the Nordic Optical Telescope Scientific Association at the Observatorio del Roque de los Muchachos, La Palma, Spain, of the Instituto de Astrofísica de Canarias.American Astronomical SocietyEuropean Research CouncilInstrument Center for Danish AstrophysicsDanish Agency for Science, Technology and InnovationVillum FondenNational Science Foundation (US)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2025202520172025info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Postprintinfo:eu-repo/semantics/acceptedVersionhttp://hdl.handle.net/10261/380601reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/EC/FP7/307260info:eu-repo/grantAgreement/MINECO//AYA2014-58381-Phttp://dx.doi.org/10.3847/2041-8213/aa6157Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3806012026-05-22T06:33:51Z
dc.title.none.fl_str_mv Time-resolved Polarimetry of the Superluminous SN 2015bn with the Nordic Optical Telescope
title Time-resolved Polarimetry of the Superluminous SN 2015bn with the Nordic Optical Telescope
spellingShingle Time-resolved Polarimetry of the Superluminous SN 2015bn with the Nordic Optical Telescope
Leloudas, Giorgos
Supernovae: general
Supernovae: individual (SN 2015bn)
title_short Time-resolved Polarimetry of the Superluminous SN 2015bn with the Nordic Optical Telescope
title_full Time-resolved Polarimetry of the Superluminous SN 2015bn with the Nordic Optical Telescope
title_fullStr Time-resolved Polarimetry of the Superluminous SN 2015bn with the Nordic Optical Telescope
title_full_unstemmed Time-resolved Polarimetry of the Superluminous SN 2015bn with the Nordic Optical Telescope
title_sort Time-resolved Polarimetry of the Superluminous SN 2015bn with the Nordic Optical Telescope
dc.creator.none.fl_str_mv Leloudas, Giorgos
Maund, J. R.
Gal-Yam, Avishay
Pursimo, Tapio
Hsiao, Eric
Malesani, Daniele B.
Patat, F.
de Ugarte Postigo, A.
Sollerman, J.
Stritzinger, Maximilian
Wheeler, J.C.
author Leloudas, Giorgos
author_facet Leloudas, Giorgos
Maund, J. R.
Gal-Yam, Avishay
Pursimo, Tapio
Hsiao, Eric
Malesani, Daniele B.
Patat, F.
de Ugarte Postigo, A.
Sollerman, J.
Stritzinger, Maximilian
Wheeler, J.C.
author_role author
author2 Maund, J. R.
Gal-Yam, Avishay
Pursimo, Tapio
Hsiao, Eric
Malesani, Daniele B.
Patat, F.
de Ugarte Postigo, A.
Sollerman, J.
Stritzinger, Maximilian
Wheeler, J.C.
author2_role author
author
author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv European Research Council
Instrument Center for Danish Astrophysics
Danish Agency for Science, Technology and Innovation
Villum Fonden
National Science Foundation (US)
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Supernovae: general
Supernovae: individual (SN 2015bn)
topic Supernovae: general
Supernovae: individual (SN 2015bn)
description We present imaging polarimetry of the superluminous supernova SN 2015bn, obtained over nine epochs between -20 and +46 days with the Nordic Optical Telescope. This was a nearby, slowly evolving Type I superluminous supernova that has been studied extensively and for which two epochs of spectropolarimetry are also available. Based on field stars, we determine the interstellar polarization in the Galaxy to be negligible. The polarization of SN 2015bn shows a statistically significant increase during the last epochs, confirming previous findings. Our well-sampled imaging polarimetry series allows us to determine that this increase (from ∼0.54% to ≳1.10%) coincides in time with rapid changes that took place in the optical spectrum. We conclude that the supernova underwent a "phase transition" at around +20 days, when the photospheric emission shifted from an outer layer, dominated by natal C and O, to a more aspherical inner core, dominated by freshly nucleosynthesized material. This two-layered model might account for the characteristic appearance and properties of Type I superluminous supernovae. © 2017. The American Astronomical Society
publishDate 2017
dc.date.none.fl_str_mv 2017
2025
2025
2025
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Postprint
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/380601
url http://hdl.handle.net/10261/380601
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
#PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/EC/FP7/307260
info:eu-repo/grantAgreement/MINECO//AYA2014-58381-P
http://dx.doi.org/10.3847/2041-8213/aa6157
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv American Astronomical Society
publisher.none.fl_str_mv American Astronomical Society
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.81155

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