Rapid Transients Originating from Thermonuclear Explosions in Helium White Dwarf Tidal Disruption Events

Kawana, Kojiro; Maeda, Keiichi; Yoshida, Naoki; Tanikawa, Ataru

doi:10.3847/2041-8213/ab7209

Cited by 13 publications

(14 citation statements)

References 56 publications

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“…Nevertheless, the requirements on the central engine and the ejecta mass still rule out the possibility that SN 2019bkc is a SN ".Ia" explosion due to helium-shell detonations on the surface of a sub-Chandrasekhar mass WD (Bildsten et al 2007;Shen et al 2010). Alternatively, SN 2019bkc could originate from the collapse/disruption of a WD, specifically, (i) an accretion-induced collapse of a WD (Canal & Schatzman 1976;Ergma & Tutukov 1976;Dessart et al 2006;Yu et al 2019b,c), (ii) a merger of a WD with a NS or a stellar-mass black hole (BH; Metzger 2012;McBrien et al 2019), and (iii) the tidal disruption of a WD by a BH of an intermediate mass of ∼ 10 2.5 M ⊙ (Kawana et al 2020). Fairly speaking, the last scenario could be most likely to generate a sufficiently heavy ejecta.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Modeling the fast optical transient SN 2019bkc/ATLAS19dqr with a central engine and implication for its origin

Zheng,

2021

Preprint

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Modern wide-field high-cadence surveys have revealed the significant diversity of optical transient phenomena in their luminosity and timescale distributions, which led to the discovery of some mysterious fast optical transients (FOTs). These FOTs can usually rise and decline remarkably in a timescale of a few days to weeks, which are obviously much rapider than ordinary supernovae. SN 2019bkc/ATLAS19dqr is one of the fastest detected FOTs so far and, meanwhile, it was found to be un-associated with a host galaxy. These discoveries provide a good chance to explore the possible origins of FOTs. So, we model the light curves of SN 2019bkc in details. It is found that SN 2019bkc can be well explained by the thermal emission of an explosion ejecta that is powered by a long-lasting central engine. The engine could be a spinning-down millisecond magnetar or a fallback accretion onto a compact object. Combining the engine property, the mass of the ejecta, and the hostlessness of SN 2019bkc, we suggest that this FOT is likely to originate from a merger of a white dwarf and a neutron star.

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Section: Conclusion and Discussionmentioning

confidence: 99%

Modeling the fast optical transient SN 2019bkc/ATLAS19dqr with a central engine and implication for its origin

Zheng,

2021

Preprint

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“…Specifically, their remote locations and old host environments point to old progenitors involving white dwarfs (WDs) in binary systems. Suggested channels include helium shell detonations on WDs (Bildsten et al 2007;Shen et al 2010;Waldman et al 2011;Sim et al 2012;Dessart & Hillier 2015;Meng & Han 2015), double detonations of He shells on the surface of WDs (Sim et al 2012;Polin et al 2019aPolin et al , 2019b, mergers of WDs with neutron stars (Metzger 2012;Margalit & Metzger 2016;Bobrick et al 2017;Toonen et al 2018;Zenati et al 2019), tidal disruptions of WDs by intermediate-mass black holes (Rosswog et al 2008;MacLeod et al 2014;Sell et al 2015;MacLeod et al 2016;Sell et al 2018;Kawana et al 2020), and even extreme core-collapse SNe from highly stripped massive stars (Tauris et al 2015;Moriya et al 2017); however their old environments make core-collapse SNe unlikely (Perets et al 2011). If they arise from binary WD systems, Meng & Han (2015) show that the old environments and consequently long delay times constrain the progenitor binary to consist of low-mass CO (0.6  M ) and He (0.25  M ) WDs.…”

Section: Introductionmentioning

confidence: 99%

The Zwicky Transient Facility Census of the Local Universe. I. Systematic Search for Calcium-rich Gap Transients Reveals Three Related Spectroscopic Subclasses

De¹,

Kasliwal²,

Tzanidakis³

et al. 2020

ApJ

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Using the Zwicky Transient Facility alert stream, we are conducting a large spectroscopic campaign to construct a complete, volume-limited sample of transients brighter than 20 mag, and coincident within 100″ of galaxies in the Census of the Local Universe catalog. We describe the experiment design and spectroscopic completeness from the first 16 months of operations, which have classified 754 supernovae. We present results from a systematic search for calcium-rich gap transients in the sample of 22 low-luminosity (peak absolute magnitude M>−17), hydrogen-poor events found in the experiment. We report the detection of eight new events, and constrain their volumetric rate to 15%±5% of the SN Ia rate. Combining this sample with 10 previously known events, we find a likely continuum of spectroscopic properties ranging from events with SN Ia-like features (Ca-Ia objects) to those with SN Ib/c-like features (Ca-Ib/c objects) at peak light. Within the Ca-Ib/c events, we find two populations distinguished by their red (g−r≈1.5 mag) or green ( -» g r 0.5 mag) colors at the r-band peak, wherein redder events show strong line blanketing features and slower light curves (similar to Ca-Ia objects), weaker He lines, and lower [Ca II]/ [O I] in the nebular phase. We find that all together the spectroscopic continuum, volumetric rates, and striking old environments are consistent with the explosive burning of He shells on low-mass white dwarfs. We suggest that Ca-Ia and red Ca-Ib/c objects arise from the double detonation of He shells, while green Ca-Ib/c objects are consistent with low-efficiency burning scenarios like detonations in lowdensity shells or deflagrations.Unified Astronomy Thesaurus concepts: Supernovae (1668); Compact objects (288); White dwarf stars (1799) Supporting material: data behind figures, machine-readable tables

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“…This detection rate is based on a WD TDE with a 0.6𝑀 CO WD disrupted by a 10 3 𝑀 BH. However, luminosity of a thermonuclear transient depends on WD mass (MacLeod et al 2016a;Kawana et al 2020). Moreover, the success rate of thermonuclear explosion should be sensitive to both BH and WD masses, and WD compositions (e.g.…”

Section: Detectabilitymentioning

confidence: 99%

“…There are two previous studies to investigate emission properties of such transients. MacLeod et al (2016a) have examined a TDE of a 0.6𝑀 CO WD, while Kawana et al (2020) have focused on a TDE of a 0.2𝑀 He WD. Both of them have suggested that such transients should be rapid and faint transients in optical and ultraviolet bands.…”

Section: Detectabilitymentioning

confidence: 99%

“…BHs accrete WD debris, and can accompany X-ray flares (Jonker et al 2013;Shen 2019), and optical/ultraviolet transients (Clausen & Eracleous 2011). When a WD deeply penetrates within the tidal radius, it can experience thermonuclear explosion, and can be observed as a subtype of type Ia supernovae (SNe Ia) (Luminet & Pichon 1989;Rosswog et al 2008Rosswog et al , 2009aMacLeod et al 2016a;Tanikawa et al 2017;Tanikawa 2018a,b;Kawana et al 2018Kawana et al , 2020Anninos et al 2018Anninos et al , 2019, or calcium-rich gap transients (Sell et al 2015(Sell et al , 2018. Kuin et al (2019) have claimed a WD TDE as the origin of a rapidly rising and luminous transient AT2018cow (Prentice et al 2018).…”

Section: Introductionmentioning

confidence: 99%

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MOCCA-SURVEY Database -- I. Tidal disruption events of white dwarfs in globular clusters and young massive clusters

Tanikawa¹,

Giersz²,

Sedda³

2021

Preprint

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We investigate more than 1000 star cluster models (about half of all the cluster models in MOCCA-Survey Database I), and obtain the local rate density of white dwarf (WD) tidal disruption events (TDEs) in globular clusters (GCs) and young massive clusters (YMCs). We find that WD TDEs in a star cluster happen 1000 times more efficiently than predicted previously. We take into account WD TDEs in GCs, YMCs, and dwarf galaxies, and obtain the total WD TDE rate density in the local universe as ∼ 5.0 × 10 2 yr −1 Gpc −3 , 90 % of which happens in GCs. The total WD TDE rate density is 50 times larger than estimated before. Our results show that thermonuclear explosions induced by WD TDEs can be observed at a rate of 550 yr −1 by the next generation optical surveys, such as the Large Synoptic Survey Telescope. We also find that massive WDs are preferentially disrupted due to mass segregation, and that 20 % of exploding WDs have 1.0𝑀 despite of small population of such WDs. Such explosions can be as luminous and long as type Ia supernovae (SNe Ia), in contrast to previous arguments that such explosions are observed as more rapid and faint transients than SNe Ia due to their small radioactive mass ( 0.1𝑀 ) and ejecta mass ( 0.6𝑀 ).

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Rapid Transients Originating from Thermonuclear Explosions in Helium White Dwarf Tidal Disruption Events

Cited by 13 publications

References 56 publications

Modeling the fast optical transient SN 2019bkc/ATLAS19dqr with a central engine and implication for its origin

Modeling the fast optical transient SN 2019bkc/ATLAS19dqr with a central engine and implication for its origin

The Zwicky Transient Facility Census of the Local Universe. I. Systematic Search for Calcium-rich Gap Transients Reveals Three Related Spectroscopic Subclasses

MOCCA-SURVEY Database -- I. Tidal disruption events of white dwarfs in globular clusters and young massive clusters

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