The Most Luminous Supernova Asassn-15lh: Signature of a Newborn Rapidly Rotating Strange Quark Star

Dai, Z. G.; Wang, S. Q.; Wang, Jie-Shuang; Wang, L. J.; Yu, Yun-Wei

doi:10.3847/0004-637x/817/2/132

Cited by 64 publications

(56 citation statements)

References 73 publications

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“…One interpretation is a magnetar-illuminated explosion with a very high initial magnetar energy, 40 B and a relatively low magnetic field strength, 10 13 − 10 14 G embedded in a stripped core of 5 -10 M Bersten et al 2016;Dai et al 2016;Sukhbold & Woosley 2016). We have shown here that mixing and breakout are sensitive to the magnetar energy.…”

Section: Relevance To Asassn-151hmentioning

confidence: 81%

Magnetar-Powered Supernovae in Two Dimensions. I. Superluminous Supernovae

Chen

Woosley

Sukhbold

2016

ApJ

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Previous studies have shown that the radiation emitted by a rapidly rotating magnetar embedded in a young supernova can greatly amplify its luminosity. These one-dimensional studies have also revealed the existence of an instability arising from the piling up of radiatively accelerated matter in a thin dense shell deep inside the supernova. Here we examine the problem in two dimensions and find that, while instabilities cause mixing and fracture this shell into filamentary structures that reduce the density contrast, the concentration of matter in a hollow shell persists. The extent of the mixing depends upon the relative energy input by the magnetar and the kinetic energy of the inner ejecta. The light curve and spectrum of the resulting supernova will be appreciably altered, as will the appearance of the supernova remnant, which will be shellular and filamentary. A similar pile up and mixing might characterize other events where energy is input over an extended period by a centrally concentrated source, e.g. a pulsar, radioactive decay, a neutrino-powered wind, or colliding shells. The relevance of our models to the recent luminous transient ASASSN-15lh is briefly discussed.

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Section: Relevance To Asassn-151hmentioning

confidence: 81%

Magnetar-Powered Supernovae in Two Dimensions. I. Superluminous Supernovae

Chen

Woosley

Sukhbold

2016

ApJ

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“…The radioactive decay of 56 Ni is clearly ruled out (Kozyreva et al 2016;Sukhbold & Woosley 2016). Theorists have risen to the challenge to explain how the peak brightness could be obtained, with a magnetar being the favored solution (Metzger et al 2015;Bersten et al 2016;Sukhbold & Woosley 2016;Dai et al 2016) though Chatzopoulos et al (2016) match the peak with models invoking only CSM interaction or with CSM interaction dominating the early phase.…”

Section: Discussionmentioning

confidence: 99%

Asassn-15lh: A Superluminous Ultraviolet Rebrightening Observed by Swift and Hubble*

Brown

Yang

Cooke

et al. 2016

ApJ

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We present and discuss ultraviolet and optical photometry from the Ultraviolet/Optical Telescope and X-ray limits from the X-Ray Telescope on Swift and imaging polarimetry and ultraviolet/optical spectroscopy with the Hubble Space Telescope of ASASSN-15lh. It has been classified as a hydrogenpoor superluminous supernova (SLSN I) more luminous than any other supernova observed. ASASSN15lh is not detected in the X-rays in individual or coadded observations. From the polarimetry we determine that the explosion was only mildly asymmetric. We find the flux of ASASSN-15lh to increase strongly into the ultraviolet, with a ultraviolet luminosity a hundred times greater than the hydrogen-rich, ultraviolet-bright SLSN II SN 2008es. We find objects as bright as ASASSN-15lh are easily detectable beyond redshifts of ∼4 with the single-visit depths planned for the Large Synoptic Survey Telescope. Deep near-infrared surveys could detect such objects past a redshift of ∼20 enabling a probe of the earliest star formation. A late rebrightening -most prominent at shorter wavelengths -is seen about two months after the peak brightness, which is itself as bright as a superluminous supernova. The ultraviolet spectra during the rebrightening are dominated by the continuum without the broad absorption or emission lines seen in SLSNe or tidal disruption events and the early optical spectra of ASASSN-15lh. Our spectra show no strong hydrogen emission, showing only Lyα absorption near the redshift previously found by optical absorption lines of the presumed host. The properties of ASASSN-15lh are extreme when compared to either SLSNe or tidal disruption events.

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“…The ejecta of such a star explosion are mainly composed of 16 O, 20 Ne and 24 Mg (Iwamoto et al 2000;Nakamura et al 2001a;Maeda et al 2002). In the literature a range of values, from 0.06 cm 2 g −1 to 0.2 cm 2 g −1 , is used for such a composition (e.g., Wang et al 2015c;Dai et al 2016, and references therein). Here we adopt the constant value κ = 0.1 cm 2 g −1 .…”

Section: Data Preparation and Modelingmentioning

confidence: 99%

Evidence for Magnetar Formation in Broad-lined Type Ic Supernovae1998bw and 2002ap

Wang

Liu

et al. 2017

ApJ

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Broad-lined type Ic supernovae (SNe Ic-BL) are peculiar stellar explosions that distinguish themselves from ordinary SNe. Some SNe Ic-BL are associated with long-duration ( 2 s) gamma-ray bursts (GRBs). Black holes and magnetars are two types of compact objects that are hypothesized to be central engines of GRBs. In spite of decades of investigations, no direct evidence for the formation of black holes or magnetars has been found for GRBs so far. Here we report the finding that the early peak (t 50 days) and late-time (t 300 days) slow decay displayed in the light curves of both SNe 1998bw (associated with GRB 980425) and 2002ap (not GRB-associated) can be attributed to magnetar spin-down with initial rotation period P 0 ∼ 20 ms, while the intermediate-time (50 t 300 days) exponential decline is caused by radioactive decay of 56 Ni. The connection between the early peak and late-time slow decline in the light curves is unexpected in alternative models. We thus suggest that GRB 980425 and SN 2002ap were powered by magnetars.

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The Most Luminous Supernova Asassn-15lh: Signature of a Newborn Rapidly Rotating Strange Quark Star

Cited by 64 publications

References 73 publications

Magnetar-Powered Supernovae in Two Dimensions. I. Superluminous Supernovae

Magnetar-Powered Supernovae in Two Dimensions. I. Superluminous Supernovae

Asassn-15lh: A Superluminous Ultraviolet Rebrightening Observed by Swift and Hubble*

Evidence for Magnetar Formation in Broad-lined Type Ic Supernovae1998bw and 2002ap

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