A spectropolarimetric comparison of the type II-Plateau supernovae SN 2008bk and SN 2004dj

Douglas C. Leonard, Luc Dessart, D. John Hillier, Giuliano Pignata

Resultado de la investigación: Conference contribution

8 Citas (Scopus)

Resumen

The Type II-Plateau supernova (SN II-P) SN 2004dj was the first SN II-P for which spectropolarimetry data were obtained with fine temporal sampling before, during, and after its fall off of the photometric plateau - the point that marks the transition from the photospheric to the nebular phase in SNe II-P. Unpolarized during the plateau, SN 2004dj showed a dramatic spike in polarization during the descent off of the plateau, and then exhibited a smooth polarization decline over the next two hundred days. This behavior was interpreted by Leonard et al. (2006) as evidence for a strongly non-spherical explosion mechanism that had imprinted asphericity only in the innermost ejecta. In this brief report, we compare nine similarly well-sampled epochs of spectropolarimetry of the Type II-P SN 2008bk to those of SN 2004dj. In contrast to SN 2004dj, SN 2008bk became polarized well before the end of the plateau and also retained a nearly constant level of polarization through the early nebular phase. Curiously, although the onset and persistence of polarization differ between the two objects, the detailed spectropolarimetric characteristics at the epochs of recorded maximum polarization for the two objects are extremely similar, feature by feature. We briefly interpret the data in light of non-Local-Thermodynamic Equilibrium, time-dependent radiative-transfer simulations specifically crafted for SN II-P ejecta.

Idioma originalEnglish
Título de la publicación alojadaStellar Polarimetry
Subtítulo de la publicación alojadaFrom Birth to Death
Páginas204-207
Número de páginas4
Volumen1429
DOI
EstadoPublished - 29 may 2012
EventoStellar Polarimetry: From Birth to Death - Madison, WI, United States
Duración: 27 jun 201130 jun 2011

Other

OtherStellar Polarimetry: From Birth to Death
PaísUnited States
CiudadMadison, WI
Período27/06/1130/06/11

Huella dactilar

supernovae
plateaus
polarization
ejecta
time measurement
asphericity
descent
thermodynamic equilibrium
spikes
radiative transfer
explosions
sampling
simulation

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Citar esto

Leonard, D. C., Dessart, L., Hillier, D. J., & Pignata, G. (2012). A spectropolarimetric comparison of the type II-Plateau supernovae SN 2008bk and SN 2004dj. En Stellar Polarimetry: From Birth to Death (Vol. 1429, pp. 204-207) https://doi.org/10.1063/1.3701926
Leonard, Douglas C. ; Dessart, Luc ; Hillier, D. John ; Pignata, Giuliano. / A spectropolarimetric comparison of the type II-Plateau supernovae SN 2008bk and SN 2004dj. Stellar Polarimetry: From Birth to Death. Vol. 1429 2012. pp. 204-207
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title = "A spectropolarimetric comparison of the type II-Plateau supernovae SN 2008bk and SN 2004dj",
abstract = "The Type II-Plateau supernova (SN II-P) SN 2004dj was the first SN II-P for which spectropolarimetry data were obtained with fine temporal sampling before, during, and after its fall off of the photometric plateau - the point that marks the transition from the photospheric to the nebular phase in SNe II-P. Unpolarized during the plateau, SN 2004dj showed a dramatic spike in polarization during the descent off of the plateau, and then exhibited a smooth polarization decline over the next two hundred days. This behavior was interpreted by Leonard et al. (2006) as evidence for a strongly non-spherical explosion mechanism that had imprinted asphericity only in the innermost ejecta. In this brief report, we compare nine similarly well-sampled epochs of spectropolarimetry of the Type II-P SN 2008bk to those of SN 2004dj. In contrast to SN 2004dj, SN 2008bk became polarized well before the end of the plateau and also retained a nearly constant level of polarization through the early nebular phase. Curiously, although the onset and persistence of polarization differ between the two objects, the detailed spectropolarimetric characteristics at the epochs of recorded maximum polarization for the two objects are extremely similar, feature by feature. We briefly interpret the data in light of non-Local-Thermodynamic Equilibrium, time-dependent radiative-transfer simulations specifically crafted for SN II-P ejecta.",
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Leonard, DC, Dessart, L, Hillier, DJ & Pignata, G 2012, A spectropolarimetric comparison of the type II-Plateau supernovae SN 2008bk and SN 2004dj. En Stellar Polarimetry: From Birth to Death. vol. 1429, pp. 204-207, Stellar Polarimetry: From Birth to Death, Madison, WI, United States, 27/06/11. https://doi.org/10.1063/1.3701926

A spectropolarimetric comparison of the type II-Plateau supernovae SN 2008bk and SN 2004dj. / Leonard, Douglas C.; Dessart, Luc; Hillier, D. John; Pignata, Giuliano.

Stellar Polarimetry: From Birth to Death. Vol. 1429 2012. p. 204-207.

Resultado de la investigación: Conference contribution

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T1 - A spectropolarimetric comparison of the type II-Plateau supernovae SN 2008bk and SN 2004dj

AU - Leonard, Douglas C.

AU - Dessart, Luc

AU - Hillier, D. John

AU - Pignata, Giuliano

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N2 - The Type II-Plateau supernova (SN II-P) SN 2004dj was the first SN II-P for which spectropolarimetry data were obtained with fine temporal sampling before, during, and after its fall off of the photometric plateau - the point that marks the transition from the photospheric to the nebular phase in SNe II-P. Unpolarized during the plateau, SN 2004dj showed a dramatic spike in polarization during the descent off of the plateau, and then exhibited a smooth polarization decline over the next two hundred days. This behavior was interpreted by Leonard et al. (2006) as evidence for a strongly non-spherical explosion mechanism that had imprinted asphericity only in the innermost ejecta. In this brief report, we compare nine similarly well-sampled epochs of spectropolarimetry of the Type II-P SN 2008bk to those of SN 2004dj. In contrast to SN 2004dj, SN 2008bk became polarized well before the end of the plateau and also retained a nearly constant level of polarization through the early nebular phase. Curiously, although the onset and persistence of polarization differ between the two objects, the detailed spectropolarimetric characteristics at the epochs of recorded maximum polarization for the two objects are extremely similar, feature by feature. We briefly interpret the data in light of non-Local-Thermodynamic Equilibrium, time-dependent radiative-transfer simulations specifically crafted for SN II-P ejecta.

AB - The Type II-Plateau supernova (SN II-P) SN 2004dj was the first SN II-P for which spectropolarimetry data were obtained with fine temporal sampling before, during, and after its fall off of the photometric plateau - the point that marks the transition from the photospheric to the nebular phase in SNe II-P. Unpolarized during the plateau, SN 2004dj showed a dramatic spike in polarization during the descent off of the plateau, and then exhibited a smooth polarization decline over the next two hundred days. This behavior was interpreted by Leonard et al. (2006) as evidence for a strongly non-spherical explosion mechanism that had imprinted asphericity only in the innermost ejecta. In this brief report, we compare nine similarly well-sampled epochs of spectropolarimetry of the Type II-P SN 2008bk to those of SN 2004dj. In contrast to SN 2004dj, SN 2008bk became polarized well before the end of the plateau and also retained a nearly constant level of polarization through the early nebular phase. Curiously, although the onset and persistence of polarization differ between the two objects, the detailed spectropolarimetric characteristics at the epochs of recorded maximum polarization for the two objects are extremely similar, feature by feature. We briefly interpret the data in light of non-Local-Thermodynamic Equilibrium, time-dependent radiative-transfer simulations specifically crafted for SN II-P ejecta.

KW - Supernovae: individual (SN 2004dj, SN 2008bk)

KW - Techniques: polarimetric

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Leonard DC, Dessart L, Hillier DJ, Pignata G. A spectropolarimetric comparison of the type II-Plateau supernovae SN 2008bk and SN 2004dj. En Stellar Polarimetry: From Birth to Death. Vol. 1429. 2012. p. 204-207 https://doi.org/10.1063/1.3701926