Optical Spectropolarimetry of SN 2002[CLC]ap[/CLC]: A High-Velocity Asymmetric Explosion

Kawabata, Koji S.; Jeffery, David J.; Iye, Masanori; Ohyama, Youichi; Kosugi, George; Kashikawa, Nobunari; Ebizuka, Noboru; Sasaki, Toshiyuki; Sekiguchi, K.; Nomoto, Ken’ichi; Mazzali, P. A.; Deng, J. S.; Maeda, Keiichi; Umeda, Hideyuki; Aoki, Kentaro; Saito, Yoshihiko; Takata, Tadafumi; Yoshida, Michitoshi; Asai, Ryo; Inata, Motoko; Okita, Kiichi; Ota, Kazuaki; Ozawa, Tomohiro; Shimizu, Yasuhiro; Taguchi, Hiroko; Yadoumaru, Yasushi; Misawa, Toru; Nakata, Fumiaki; Yamada, Tōru; Tanaka, Ichi; Kodama, Takanori

doi:10.1086/345545

Cited by 86 publications

(65 citation statements)

References 32 publications

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“…The low levels of continuum polarisation observed here are consistent with those found in other stripped CCSNe, such as SNe 2008D, 2007gr, 2005bf, and 2002ap (Maund et al 2009Tanaka et al 2008;Maund et al 2007b;Kawabata et al 2002). These levels of polarisation limit the degree of global asymmetries to ∼ <10% (Höflich 1991).…”

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

confidence: 87%

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 Ccsnesupporting

confidence: 87%

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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“…Considering the results of Kawabata et al (2002) along with their own, Leonard et al (2002) concluded an MW-dominated ISP value of = -Q 0.17 Wang et al (2003) arrived at a similar value of = -Q 0.26…”

Section: Interstellar Polarizationmentioning

confidence: 90%

“…Prior to SN 2013ej, Messier 74 was host to SN 2002ap, for which spectropolarimetry was obtained by Leonard et al (2002), Kawabata et al (2002), and Wang et al (2003). Considering the results of Kawabata et al (2002) along with their own, Leonard et al (2002) concluded an MW-dominated ISP value of = -Q 0.17 Wang et al (2003) arrived at a similar value of = -Q 0.26…”

Section: Interstellar Polarizationmentioning

confidence: 98%

Asphericity, Interaction, and Dust in the Type Ii-P/Ii-L Supernova 2013ej in Messier 74

Mauerhan

Dyk

Johansson

et al. 2017

ApJ

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SN 2013ej is a well-studied core-collapse supernova (SN) that stemmed from a directly identified red supergiant (RSG) progenitor in galaxy M74. The source exhibits signs of substantial geometric asphericity, X-rays from persistent interaction with circumstellar material (CSM), thermal emission from warm dust, and a light curve that appears intermediate between supernovae of Types II-P and II-L. The proximity of this source motivates a close inspection of these physical characteristics and their potential interconnection. We present multiepoch spectropolarimetry of SN 2013ej during the first 107 days and deep optical spectroscopy and ultraviolet through infrared photometry past ∼800 days. SN 2013ej exhibits the strongest and most persistent continuum and line polarization ever observed for a SN of its class during the recombination phase. Modeling indicates that the data are consistent with an oblate ellipsoidal photosphere, viewed nearly edge-on and probably augmented by optical scattering from circumstellar dust. We suggest that interaction with an equatorial distribution of CSM, perhaps the result of binary evolution, is responsible for generating the photospheric asphericity. Relatedly, our late-time optical imaging and spectroscopy show that asymmetric CSM interaction is ongoing, and the morphology of broad Hα emission from shock-excited ejecta provides additional evidence that the geometry of the interaction region is ellipsoidal. Alternatively, a prolate ellipsoidal geometry from an intrinsically bipolar explosion is also a plausible interpretation of the data but would probably require a ballistic jet of radioactive material capable of penetrating the hydrogen envelope early in the recombination phase. Finally, our latest space-based optical imaging confirms that the late interaction-powered light curve dropped below the stellar progenitor level, confirming the RSG star's association with the explosion.

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“…However, as we report in this Letter, some normal Ic SNe like Based on observations made with the Nordic Optical Telescope, operated on the island of La Palma, in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias, and on observations done at the Centro Astronómico Hispano Alemán (CAHA) at Calar alto, operated jointly by the Max-Planck Institut für Astronomie and the Instituto de Astrofísica de Andalucía (CSIC). SN 2002ap (Mazzali et al 2002) share some similarities with SN 2006aj; polarization levels above ∼1% and, more interestingly, long-term rotations in the polarization angle (Kawabata et al 2002).…”

Section: Introductionmentioning

confidence: 99%

Detection of optical linear polarization in the SN 2006aj/XRF 060218 non-spherical expansion

Gorosabel¹,

Ларионов

Castro-Tirado³

et al. 2006

A&A

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Aims. We have performed optical polarimetric observations of the SN 2006aj associated to the X-ray flash (XRF) of February 18, 2006, XRF 060218 that provide information on its expansion geometry. Methods. The data were acquired in the R-band with the 0.7 m telescope of Crimea, 2.5 m Nordic Optical Telescope and the 2.2 m of Calar Alto. Results. We report the detection of linear polarization between 3 and 39 days after the gamma-ray event (t − t 0 ). This represents the first polarization detection of a Ic supernova (SN) associated to an XRF. Our data exhibit a degree of linear polarization (P) around P ∼ 4% at t − t 0 ∼ 3−5 days, followed by a constant polarization phase with P ∼ 1.4% at 13.7 < ∼ t − t 0 < ∼ 39 days. Our data suggest a decay in P, and more interestingly, show a position angle (θ) rotation of ∼100• comparing data taken before and after the R-band lightcurve peak. Conclusions. The reported polarization measurements can be explained by the evolution of an asymmetric SN expansion. We discuss on several ingredients that could account for the observed θ rotation.

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Optical Spectropolarimetry of SN 2002[CLC]ap[/CLC]: A High-Velocity Asymmetric Explosion

Cited by 86 publications

References 32 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

Asphericity, Interaction, and Dust in the Type Ii-P/Ii-L Supernova 2013ej in Messier 74

Detection of optical linear polarization in the SN 2006aj/XRF 060218 non-spherical expansion

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