Spectropolarimetry of the Type Ia supernova 2012fr

Justyn Robert Maund; J. Spyromilio; P.A. Hoeflich; J.C. Wheeler; D. Baade; A. Clocchiatti; F. Patat; E. Reilly; L. Wang; P. Zelaya

doi:10.1093/mnrasl/slt050

Spectropolarimetry of the Type Ia supernova 2012fr

Justyn Robert Maund, J. Spyromilio, P.A. Hoeflich, J.C. Wheeler, D. Baade, A. Clocchiatti, F. Patat, E. Reilly, L. Wang, P. Zelaya

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31 Citationer (Scopus)

Abstract

Spectropolarimetry provides the means to probe the 3D geometries of supernovae (SNe) at early times. We report spectropolarimetric observations of the Type Ia SN 2012fr at four epochs: .11, .5, +2 and +24 d, with respect to B-light-curve maximum. SN 2012fr is a normal Type Ia SN, similar to SNe 1990N, 2000cx and 2005hj (that all exhibit low velocity decline rates for the principal Si II line). The SN displays high-velocity components at .11 d that are highly polarized. The polarization of these features decreases as they become weaker from .5 d. At +2 d, the polarization angles of the low-velocity components of silicon and calcium are identical and oriented at 90°. relative to the high-velocity Ca component. In addition to having very different velocities, the high- and low-velocity Ca components have orthogonal distributions in the plane of the sky. The continuum polarization for the SN at all four epochs is low, <0.1 per cent. We conclude that the low level of continuum polarization is inconsistent with the merger-induced explosion scenario. The simple axial symmetry evident from the polarization angles of the high-velocity and low-velocity Ca components, along with the presence of high-velocity components of Si and Ca, is perhaps more consistent with the pulsating delayed detonation model. We predict that, during the nebular phase, SN 2012fr will display blueshifted emission lines of Fe-group elements.

Originalsprog	Engelsk
Tidsskrift	Monthly Notices of the Royal Astronomical Society
Vol/bind	433
Udgave nummer	1
Sider (fra-til)	L20-L24
ISSN	0035-8711
DOI	https://doi.org/10.1093/mnrasl/slt050
Status	Udgivet - jul. 2013

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10.1093/mnrasl/slt050

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title = "Spectropolarimetry of the Type Ia supernova 2012fr",

abstract = "Spectropolarimetry provides the means to probe the 3D geometries of supernovae (SNe) at early times. We report spectropolarimetric observations of the Type Ia SN 2012fr at four epochs: .11, .5, +2 and +24 d, with respect to B-light-curve maximum. SN 2012fr is a normal Type Ia SN, similar to SNe 1990N, 2000cx and 2005hj (that all exhibit low velocity decline rates for the principal Si II line). The SN displays high-velocity components at .11 d that are highly polarized. The polarization of these features decreases as they become weaker from .5 d. At +2 d, the polarization angles of the low-velocity components of silicon and calcium are identical and oriented at 90°. relative to the high-velocity Ca component. In addition to having very different velocities, the high- and low-velocity Ca components have orthogonal distributions in the plane of the sky. The continuum polarization for the SN at all four epochs is low, <0.1 per cent. We conclude that the low level of continuum polarization is inconsistent with the merger-induced explosion scenario. The simple axial symmetry evident from the polarization angles of the high-velocity and low-velocity Ca components, along with the presence of high-velocity components of Si and Ca, is perhaps more consistent with the pulsating delayed detonation model. We predict that, during the nebular phase, SN 2012fr will display blueshifted emission lines of Fe-group elements.",

author = "Maund, {Justyn Robert} and J. Spyromilio and P.A. Hoeflich and J.C. Wheeler and D. Baade and A. Clocchiatti and F. Patat and E. Reilly and L. Wang and P. Zelaya",

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doi = "10.1093/mnrasl/slt050",

language = "English",

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T1 - Spectropolarimetry of the Type Ia supernova 2012fr

AU - Maund, Justyn Robert

AU - Spyromilio, J.

AU - Hoeflich, P.A.

AU - Wheeler, J.C.

AU - Baade, D.

AU - Clocchiatti, A.

AU - Patat, F.

AU - Reilly, E.

AU - Wang, L.

AU - Zelaya, P.

PY - 2013/7

Y1 - 2013/7

N2 - Spectropolarimetry provides the means to probe the 3D geometries of supernovae (SNe) at early times. We report spectropolarimetric observations of the Type Ia SN 2012fr at four epochs: .11, .5, +2 and +24 d, with respect to B-light-curve maximum. SN 2012fr is a normal Type Ia SN, similar to SNe 1990N, 2000cx and 2005hj (that all exhibit low velocity decline rates for the principal Si II line). The SN displays high-velocity components at .11 d that are highly polarized. The polarization of these features decreases as they become weaker from .5 d. At +2 d, the polarization angles of the low-velocity components of silicon and calcium are identical and oriented at 90°. relative to the high-velocity Ca component. In addition to having very different velocities, the high- and low-velocity Ca components have orthogonal distributions in the plane of the sky. The continuum polarization for the SN at all four epochs is low, <0.1 per cent. We conclude that the low level of continuum polarization is inconsistent with the merger-induced explosion scenario. The simple axial symmetry evident from the polarization angles of the high-velocity and low-velocity Ca components, along with the presence of high-velocity components of Si and Ca, is perhaps more consistent with the pulsating delayed detonation model. We predict that, during the nebular phase, SN 2012fr will display blueshifted emission lines of Fe-group elements.

AB - Spectropolarimetry provides the means to probe the 3D geometries of supernovae (SNe) at early times. We report spectropolarimetric observations of the Type Ia SN 2012fr at four epochs: .11, .5, +2 and +24 d, with respect to B-light-curve maximum. SN 2012fr is a normal Type Ia SN, similar to SNe 1990N, 2000cx and 2005hj (that all exhibit low velocity decline rates for the principal Si II line). The SN displays high-velocity components at .11 d that are highly polarized. The polarization of these features decreases as they become weaker from .5 d. At +2 d, the polarization angles of the low-velocity components of silicon and calcium are identical and oriented at 90°. relative to the high-velocity Ca component. In addition to having very different velocities, the high- and low-velocity Ca components have orthogonal distributions in the plane of the sky. The continuum polarization for the SN at all four epochs is low, <0.1 per cent. We conclude that the low level of continuum polarization is inconsistent with the merger-induced explosion scenario. The simple axial symmetry evident from the polarization angles of the high-velocity and low-velocity Ca components, along with the presence of high-velocity components of Si and Ca, is perhaps more consistent with the pulsating delayed detonation model. We predict that, during the nebular phase, SN 2012fr will display blueshifted emission lines of Fe-group elements.

U2 - 10.1093/mnrasl/slt050

DO - 10.1093/mnrasl/slt050

M3 - Journal article

SN - 0035-8711

VL - 433

SP - L20-L24

JO - Royal Astronomical Society. Monthly Notices

JF - Royal Astronomical Society. Monthly Notices

IS - 1

ER -

Spectropolarimetry of the Type Ia supernova 2012fr

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