Tidal Disruptions of White Dwarfs: Theoretical Models and Observational Prospects

Maguire, K.; Eracleous, Michael; Jonker, P. G.; MacLeod, Morgan; Rosswog, Stephan

doi:10.1007/s11214-020-00661-2

Cited by 42 publications

(48 citation statements)

References 170 publications

(217 reference statements)

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“…This means that the current GC number density is 15.4 Mpc −3 . This may be 3 times larger than estimated by previous studies (Maguire et al 2020) 1 . We later discuss about this effect.…”

Section: Methodsmentioning

confidence: 49%

“…Our current GC number density is 15.4 Mpc −3 . Maguire et al (2020) have supposed that the current GC number density is 5.35 Mpc −3 . Although our current GC number density is 3 times larger than theirs, the difference between assumed GC number densities cannot explain the difference between the derived rate densities.…”

Section: Comparison With Previous Studiesmentioning

confidence: 99%

“…This phenomenon is called a TDE standing for a tidal disruption event (see reviews by Komossa 2015;Stone et al 2019;Rossi et al 2020). The disrupted star can be a white dwarf (WD) (see review by Maguire et al 2020). We call a TDE of a WD "WD TDE".…”

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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“…This means that the current GC number density is 15.4 Mpc −3 . This may be 3 times larger than estimated by previous studies (Maguire et al 2020) 1 . We later discuss about this effect.…”

Section: Methodsmentioning

confidence: 49%

Section: Comparison With Previous Studiesmentioning

confidence: 99%

See 1 more Smart Citation

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

Tanikawa¹,

Giersz²,

Sedda³

2021

Preprint

View full text Add to dashboard Cite

show abstract

“…The unique environments in AGN disks are expected to give rise to a wealth of other interesting phenomena, such as the tidal disruption of a star by a neutron star (albeit at a smaller rate of 0.1 Gpc −3 yr −1 ), the formation of Thorne-Zytkow objects (Thorne & Zytkow 1975) when a neutron star in the disk is unable to tidally disrupt a stellar companion due to a large stellar radius, the tidal disruption of white dwarfs by stellar-mass BHs, with unique signatures (Maguire et al 2020), and the accretion induced collapse of neutron stars (Perna et al 2021b) and white dwarfs (Zhu et al 2021a).…”

Section: Discussionmentioning

confidence: 99%

Micro Tidal Disruption Events in Active Galactic Nuclei

Yang,

Bartos,

Fragione

et al. 2021

Preprint

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Active galactic nuclei (AGNs) can act as black hole assembly lines, funneling some of the stellar-mass black holes from the vicinity of the galactic center into the inner plane of the AGN disk where the black holes can merge through dynamical friction and gravitational wave emission. Here, we show that stars near the galactic center are also brought into the AGN disk, where they can be tidally disrupted by the stellar-mass black holes in the disk. Such micro-tidal disruption events (micro-TDEs) could be useful probe of stellar interaction with the AGN disk. We find that micro-TDEs in AGNs occur at a rate of ∼ 170 Gpc −3 yr −1 . Their cleanest observational probe may be the detection of tidal disruption in AGNs by heavy supermassive black holes (M • 10 8 M ) so that cannot tidally disrupt solar-type stars. We discuss two such TDE candidates observed to date (ASASSN-15lh and ZTF19aailpwl).

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“…The nearby FXRTs 2, 3, 4, 5, and 6 have peak isotropic X-ray luminosities in the range of L X,peak ≈10 38 -10 40 erg s −1 (see Table 9). This appears inconsistent with origins as SBOs (L SBOs X,peak ≈10 42 -10 45 erg s −1 ; Ensman & Burrows 1992;Soderberg et al 2008;Modjaz et al 2009;Waxman & Katz 2017), TDEs (L TDEs X,peak ≈10 42 -10 50 erg s −1 ; Rees 1988;MacLeod et al 2014;Maguire et al 2020;Saxton et al 2021, considering a jetted emission), or on-axis GRBs (L GRBs X,peak ≈10 47 -10 51 erg s −1 ; Berger 2014; Bauer et al 2017, considering a jetted emission).…”

Section: Nearby Extragalactic Fxrt Samplementioning

confidence: 92%

Extragalactic fast X-ray transient candidates discovered by Chandra (2000-2014)

Quirola-Vasquez,

Bauer,

Jonker

et al. 2022

Preprint

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Context. Extragalactic Fast X-ray Transients (FXRTs) are short flashes of X-ray photons spanning a few seconds to hours, with an uncertain origin. Aims. Our ignorance about their physical mechanisms and progenitor systems is due in part to the lack of clear multi-wavelength counterparts in most cases,because they only have been identified serendipitously. Methods. We develop a systematic search of FXRTs using a straightforward X-ray flare search algorithm, in the Chandra Source Catalog (Data Release 2.0; 169.6 Ms over 592.4 deg 2 using only observations with |b|>10 • and before 2015), incorporating various multi-wavelength constraints to rule out Galactic contamination and characterize the candidates. Results. We report the detection of 14 FXRT candidates from a parent sample of 214,701 sources. Candidates have peak 0.5-7 keV fluxes between 1×10 −13 to 2×10 −10 erg cm −2 s −1 and T 90 values from 4 to 48 ks. The sample can be subdivided into two groups: six "nearby" FXRTs that occurred within d 100 Mpc and eight "distant" FXRTs with likely redshifts 0.1. Three distant FXRT candidates exhibit light curves with a plateau (≈1-3 ks duration) followed by a power-law decay and X-ray spectral softening, similar to what was observed for the previously reported FXRT CDF-S XT2, a proposed magnetar-powered binary neutron star merger event. After applying completeness corrections, we calculate event rates for the nearby and distant samples of 53.7 +22.6 −15.1 and 28.2 +9.8 −6.9 deg −2 yr −1 , respectively. Conclusions. This novel sample of Chandra-detected extragalactic FXRT candidates, although modest in size, breaks new ground in terms of characterizing the diverse properties, nature, and possible progenitors of these enigmatic events.

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Tidal Disruptions of White Dwarfs: Theoretical Models and Observational Prospects

Cited by 42 publications

References 170 publications

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

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

Micro Tidal Disruption Events in Active Galactic Nuclei

Extragalactic fast X-ray transient candidates discovered by Chandra (2000-2014)

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