A WC/WO star exploding within an expanding carbon–oxygen–neon nebula

Gal‐Yam, A.; Bruch, R.; Schulze, S.; Yang, Yi; Perley, D.; Irani, I.; Sollerman, J.; Kool, Erik C.; Soumagnac, Maayane T.; Yaron, O.; Strotjohann, N. L.; Zimmerman, E.; Barbarino, C.; Kulkarni, S. R.; Kasliwal, M. M.; De, Kishalay; Yao, Yuhan; Fremling, C.; Yan, Lin; Ofek, E. O.; Fransson, Claes; Filippenko, A. V.; Zheng, W.; Brink, Thomas G.; Copperwheat, C. M.; Foley, R. J.; Brown, Justin M.; Siebert, M. R.; Leloudas, G.; Cabrera-Lavers, A.; García-Álvarez, D.; Marante-Barreto, A.; Frederick, Sara; Hung, T.; Wheeler, J. C.; Vinkó, J.; Thomas, B. P.; Graham, M. J.; Duev, Dmitry A.; Drake, A. J.; Dekany, Richard; Bellm, Eric C.; Rusholme, B.; Shupe, D. L.; Andreoni, Igor

doi:10.1038/s41586-021-04155-1

Cited by 67 publications

(109 citation statements)

References 135 publications

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“…Depending on system-to-system variations in the properties of immediate post-CE binary, its relic disk, and the evolutionary state of the progenitor star prior to the original mass-transfer or CE event, such delayed merger events could manifest as a diverse range of transient properties. Of particular relevance in this context is the possible connection between LFBOTs and Type Ibn/Icn SNe (Dessart et al 2021;Gal-Yam et al 2022). The latter class of rare fast-evolving transients share many properties with LF-BOTs, including similar optical light curves and spectroscopic evidence for shock interaction between the ejecta and slow aspherical H-poor material (Foley et al 2007;Pastorello et al 2008;Dessart et al 2021;Gal-Yam et al 2022;).…”

Section: This Paper: the Delayed Merger Scenariomentioning

confidence: 99%

“…Of particular relevance in this context is the possible connection between LFBOTs and Type Ibn/Icn SNe (Dessart et al 2021;Gal-Yam et al 2022). The latter class of rare fast-evolving transients share many properties with LF-BOTs, including similar optical light curves and spectroscopic evidence for shock interaction between the ejecta and slow aspherical H-poor material (Foley et al 2007;Pastorello et al 2008;Dessart et al 2021;Gal-Yam et al 2022;). This paper is organized as follows.…”

Section: This Paper: the Delayed Merger Scenariomentioning

confidence: 99%

“…2.6 × 10 9 K θ 0.5 0.33 M −0.45 Intermediate mass-elements, synthesized in greater abundance in the disk, include α-capture elements such as 20 Ne, 24 Mg, 28 Si, 40 Ca, 52 Fe. Given the He-rich nature of the disrupted WR star (similar to a He or mixed He/C/O composition white dwarf), previous studies show the disk will be particularly efficient at generating Ne and Ca (see Table D1 of Margalit & Metzger 2016), which are observed to be present in the ejecta of Type Icn SNe (Gal-Yam et al 2022). A more detailed calculation of the disk nucleosynthesis in the context of WR-BH/NS merger disks is required to quantify the disk-wind ejecta in greater detail.…”

Section: Composition Of the Disk-wind Ejectamentioning

confidence: 99%

“…the optical properties from LFBOTs (e.g., extremely luminous; too fast rising and decaying to be powered by 56 Ni decay; evidence for H-depleted CSM interaction) and the rare class of luminous stripped envelope stellar explosions which also exhibit evidence for strong CSM interaction−Type Ibn (e.g., Foley et al 2007;Immler et al 2008;Pastorello et al 2015;Hosseinzadeh et al 2017;Pellegrino et al 2022;Maeda & Moriya 2022) and Type Icn SNe (Gal-Yam et al 2022;.…”

Section: Connecting Lfbots To Type Ibn/icn Sne and Other Related Tran...mentioning

confidence: 99%

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Luminous Fast Blue Optical Transients and Type Ibn/Icn SNe from Wolf-Rayet/Black Hole Mergers

Metzger

2022

Preprint

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Progenitor models for the "luminous" subclass of Fast Blue Optical Transients (LFBOTs; prototype: AT2018cow) are challenged to simultaneously explain all of their observed properties: fast optical rise times days; peak luminosities 10 44 erg s −1 ; low yields 0.1M of 56 Ni; aspherical ejecta with a wide velocity range ( 3000 km s −1 to 0.1 − 0.5c with increasing polar latitude); presence of hydrogen-depleted-but-not-free dense circumstellar material (CSM) on radial scales from ∼ 10 14 cm to ∼ 3×10 16 cm; embedded variable source of non-thermal X-ray/γ−rays, suggestive of a compact object. We show that all of these properties are consistent with the tidal disruption and hyper-accretion of a Wolf-Rayet (WR) star by a black hole (BH) or neutron star (NS) binary companion. In contrast with related previous models, the merger occurs with a long delay following the common envelope (CE) event responsible for birthing the binary, as a result of gradual angular momentum loss to a relic circumbinary disk. Disk-wind outflows from the merger-generated accretion flow generate the 56 Nipoor aspherical ejecta with the requisite velocity range. The optical light curve is powered primarily by reprocessing X-rays from the inner accretion flow/jet, though CSM shock interaction also contributes. Primary CSM sources include WR mass-loss from the earliest stages of the merger ( 10 14 cm) and the relic CE disk and its photoevaporation-driven wind ( 10 16 cm). Longer delayed mergers may instead give rise to supernovae Type Ibn/Icn (depending on the WR evolutionary state), connecting these transient classes with LFBOTs.

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Section: This Paper: the Delayed Merger Scenariomentioning

confidence: 99%

Section: This Paper: the Delayed Merger Scenariomentioning

confidence: 99%

Section: Composition Of the Disk-wind Ejectamentioning

confidence: 99%

Section: Connecting Lfbots To Type Ibn/icn Sne and Other Related Tran...mentioning

confidence: 99%

See 2 more Smart Citations

Luminous Fast Blue Optical Transients and Type Ibn/Icn SNe from Wolf-Rayet/Black Hole Mergers

Metzger

2022

Preprint

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“…It is expected that the ejected material collides with the circumstellar matter formed by the detonation. This may be relevant to the recently discovered type Icn supernova (Gal-Yam et al 2021;Perley et al 2021).…”

Section: Resolution Of H ∞ For a Given Mass Of Neutron Star δHmentioning

confidence: 82%

Stationary accretion flow with nuclear burning

Nagarajan,

Shigeyama

2022

Preprint

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We present a series of numerical solutions of spherically symmetric stationary flows with nuclear burning accreted by a neutron star (or black hole). We consider the accretion of matter composed of carbon and oxygen, which mimics the flow after a neutron star is engulfed by a CO star or CO core of a massive star. It is found that there are two types of transonic solutions depending on the accretion rate. The flow with a small accretion rate reaches the center (or the surface of the central object) at supersonic speeds. The other type with a large accretion rate has another sonic point inside the transonic point and the flow truncates at the sonic point. The critical accretion rate dividing these two types is derived as a function of the mass of the central object and the specific enthalpy in the ambient matter. We discuss implications from the solutions for a new mechanism of super-Chandrasekhar type Ia supernovae and type Icn supernovae.

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Stellar Evolution, SN Explosion, and Nucleosynthesis

Maeda

2022

Handbook of X-Ray and Gamma-Ray Astrophysics

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A WC/WO star exploding within an expanding carbon–oxygen–neon nebula

Cited by 67 publications

References 135 publications

Luminous Fast Blue Optical Transients and Type Ibn/Icn SNe from Wolf-Rayet/Black Hole Mergers

Luminous Fast Blue Optical Transients and Type Ibn/Icn SNe from Wolf-Rayet/Black Hole Mergers

Stationary accretion flow with nuclear burning

Stellar Evolution, SN Explosion, and Nucleosynthesis

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