Subaru spectropolarimetry of supernovae

Tanaka, Masaomi; Kawabata, Koji S.; Hattori, Takashi; Aoki, Kentaro; Iye, Masanori; Maeda, Keiichi; Mazzali, P. A.; Nomoto, Ken’ichi; Pian, E.; Sasaki, Toshiyuki; Yamanaka, Masahito

doi:10.1063/1.3701927

Cited by 5 publications

(8 citation statements)

References 12 publications

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“…A feature consistently observed in all stripped CC-SNe (Maund et al 2009), and some thermonuclear Type Ia supernovae (Mazzali et al 2005), is the absorption trough of Ca II IR3 , which is commonly associated with high velocities (∼10-20,000 km s −1 ) and large degrees of polarisation (∼2-4%). This feature tends to form at higher velocities in the ejecta and with a polarisation angle that is markedly different to those of other species (Tanaka et al 2012;Maund et al 2009;Tanaka et al 2008;Maund et al 2007a,b). In addition, occasionally separate LV and HV components can be resolved in the Ca II line profile in the flux spectrum (e.g.…”

Section: Iptf 13bvn In the Context Of Other Stripped Ccsnementioning

confidence: 65%

Spectropolarimetry of the Type Ib Supernova iPTF 13bvn: revealing the complex explosion geometry of a stripped-envelope core-collapse supernova

Reilly

Maund

Baade

et al. 2016

Mon. Not. R. Astron. Soc.

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We present six epochs of spectropolarimetric observations and one epoch of spectroscopy of the Type Ib SN iPTF 13bvn. The epochs of these observations correspond to −10 to +61 days with respect to the r-band light curve maximum. The continuum is intrinsically polarised to the 0.2-0.4% level throughout the observations, implying asphericities of ∼10% in the shape of the photosphere. We observe significant line polarisation associated with the spectral features of Ca II IR3, He I/Na I D, He I λλ6678, 7065, Fe II λ4924 and O I λ7774. We propose that an absorption feature at ∼ 6200Å, usually identified as Si II λ6355, is most likely to be high velocity Hα at −16, 400km s −1 . Two distinctly polarised components, separated in velocity, are detected for both He I/Na I D and Ca II IR3 , indicating the presence of two discrete line forming regions in the ejecta in both radial velocity space and in the plane of the sky. We use the polarisation of He I λ5876 as a tracer of sources of non-thermal excitation in the ejecta; finding that the bulk of the radioactive nickel was constrained to lie interior to ∼ 50 − 65% of the ejecta radius. The observed polarisation is also discussed in the context of the possible progenitor system of iPTF 13bvn, with our observations favouring the explosion of a star with an extended, distorted envelope rather than a compact Wolf-Rayet star.

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Section: Iptf 13bvn In the Context Of Other Stripped Ccsnementioning

confidence: 65%

Spectropolarimetry of the Type Ib Supernova iPTF 13bvn: revealing the complex explosion geometry of a stripped-envelope core-collapse supernova

Reilly

Maund

Baade

et al. 2016

Mon. Not. R. Astron. Soc.

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“…Rather than the expected Si ii and Ca ii, its early spectrum displayed high-excitation lines of Fe iii but returned to normal a few months after maximum light. But recently other SNe Ia were found which are even more luminous than SN 1991T, with decline rates that put them well above the Phillips relation by almost one magnitude in the B-band, prototypical examples being SN 2006gz and SN 2009dc [61,[90][91][92][93][94]. By now, seven objects that may belong to this subclass have been discovered and they may contribute up to about 9% of all SNe Ia [33].…”

Section: A General Propertiesmentioning

confidence: 99%

Towards an understanding of Type Ia supernovae from a synthesis of theory and observations

et al. 2013

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Motivated by the fact that calibrated light curves of Type Ia supernovae (SNe Ia) have become a major tool to determine the expansion history of the Universe, considerable attention has been given to, both, observations and models of these events over the past 15 years. Here, we summarize new observational constraints, address recent progress in modeling Type Ia supernovae by means of three-dimensional hydrodynamic simulations, and discuss several of the still open questions. It will be be shown that the new models have considerable predictive power which allows us to study observable properties such as light curves and spectra without adjustable non-physical parameters. This is a necessary requisite to improve our understanding of the explosion mechanism and to settle the question of the applicability of SNe Ia as distance indicators for cosmology. We explore the capabilities of the models by comparing them with observations and we show how such models can be applied to study the origin of the diversity of SNe Ia.

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“…Directional dependence is important for the macronova/kilonova of the BH-NS merger [38]. In particular, the flux will differ by a factor of ≈ 1/θ ej ≈ 5 for different viewing angles at t peak .…”

Section: Macronova/kilonovamentioning

confidence: 99%

Anisotropic mass ejection from black hole-neutron star binaries: Diversity of electromagnetic counterparts

Kyutoku

Ioka²,

Shibata³

2013

Phys. Rev. D

149

178

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The merger of black hole-neutron star binaries can eject substantial material with the mass ∼ 0.01-0.1M⊙ when the neutron star is disrupted prior to the merger. The ejecta shows significant anisotropy, and travels in a particular direction with the bulk velocity ∼ 0.2c. This is drastically different from the binary neutron star merger, for which ejecta is nearly isotropic. Anisotropic ejecta brings electromagnetic-counterpart diversity which is unique to black hole-neutron star binaries, such as viewing-angle dependence, polarization, and proper motion. The kick velocity of the black hole, gravitational-wave memory emission, and cosmic-ray acceleration are also discussed.

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Subaru spectropolarimetry of supernovae

Cited by 5 publications

References 12 publications

Spectropolarimetry of the Type Ib Supernova iPTF 13bvn: revealing the complex explosion geometry of a stripped-envelope core-collapse supernova

Spectropolarimetry of the Type Ib Supernova iPTF 13bvn: revealing the complex explosion geometry of a stripped-envelope core-collapse supernova

Towards an understanding of Type Ia supernovae from a synthesis of theory and observations

Anisotropic mass ejection from black hole-neutron star binaries: Diversity of electromagnetic counterparts

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