Snapping supernovae at z&gt;1.7

Aldering, G.; Kim, Alex; Kowalski, M.; Linder, Eric V.; Perlmutter, S.

doi:10.1016/j.astropartphys.2006.11.001

Cited by 20 publications

(19 citation statements)

References 96 publications

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“…The transient sky at faint magnitudes is poorly known, but there are major efforts under way that would increase the discovery rate for Type Ia supernovae from a few thousand (Aldering et al 2007) to hundreds of thousands ( Riess & Livio 2006) per year. The transient itself should have several distinguishing characteristics.…”

Section: Discussionmentioning

confidence: 99%

Atypical Thermonuclear Supernovae from Tidally Crushed White Dwarfs

Rosswog

Ramírez-Ruiz

Hix

2008

ApJ

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Suggestive evidence has accumulated that intermediate-mass black holes ( IMBHs) exist in some globular clusters. As stars diffuse in the cluster, some will inevitable wander sufficiently close to the hole that they suffer tidal disruption. An attractive feature of the IMBH hypothesis is its potential to disrupt not only solar-type stars but also compact white dwarf stars. Attention is given to the fate of white dwarfs that approach the hole close enough to be disrupted and compressed to such an extent that explosive nuclear burning may be triggered. Precise modeling of the dynamics of the encounter, coupled with a nuclear network, allow for a realistic determination of the explosive energy release, and it is argued that ignition is a natural outcome for white dwarfs of all varieties passing well within the tidal radius. Although event rates are estimated to be significantly less than the rate of normal Type Ia supernovae, such encounters may be frequent enough in globular clusters harboring an IMBH to warrant a search for this new class of supernova.

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Section: Discussionmentioning

confidence: 99%

Atypical Thermonuclear Supernovae from Tidally Crushed White Dwarfs

Rosswog

Ramírez-Ruiz

Hix

2008

ApJ

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“…Other papers have looked at the impact of statistical uncertainties in redshifts (e.g. Huterer et al 2004;Aldering et al 2007;Chaves-Montero et al 2018), but here we concentrate on systematic uncertainties.…”

Section: Candles Vs Rulersmentioning

confidence: 99%

Can redshift errors bias measurements of the Hubble Constant?

Davis

Hinton

Howlett

et al. 2019

Monthly Notices of the Royal Astronomical Society

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Redshifts have been so easy to measure for so long that we tend to neglect the fact that they too have uncertainties and are susceptible to systematic error. As we strive to measure cosmological parameters to better than 1% it is worth reviewing the accuracy of our redshift measurements. Surprisingly small systematic redshift errors, as low as 10 −4 , can have a significant impact on the cosmological parameters we infer, such as H 0 . Here we investigate an extensive (but not exhaustive) list of ways in which redshift estimation can go systematically astray. We review common theoretical errors, such as adding redshifts instead of multiplying by (1 + z); using v = cz; and using only cosmological redshift in the estimates of luminosity and angular-diameter distances. We consider potential observational errors, such as rest wavelength precision, air to vacuum conversion, and spectrograph wavelength calibration. Finally, we explore physical effects, such as peculiar velocity corrections, galaxy internal velocities, gravitational redshifts, and overcorrecting within a bulk flow. We conclude that it would be quite easy for small systematic redshift errors to have infiltrated our data and be impacting our cosmological results. While it is unlikely that these errors are large enough to resolve the current H 0 tension, it remains possible, and redshift accuracy may become a limiting factor in near future experiments. With the enormous efforts going into calibrating the vertical axis of our plots (standard candles, rulers, clocks, and sirens) we argue that it is now worth paying a little more attention to the horizontal axis (redshifts).

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“…We see that roughly 15% are at z < 1, the median redshift is z ∼ 1.6, and roughly two-thirds are between z = 1 and 3. This distribution is well suited for probing the evolution of dark energy, since it fully samples the evolution history during the transition from the matter dominated to the dark energy dominated era [32]. The time required for a NS-NS inspiral signal to sweep through the BBO band will typically be comparable to BBO's lifetime.…”

Section: Decigomentioning

confidence: 99%

Ultrahigh precision cosmology from gravitational waves

2009

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We show that the Big Bang Observer (BBO), a proposed space-based gravitational-wave (GW) detector, would provide ultra-precise measurements of cosmological parameters. By detecting ∼ 3 × 10 5 compact-star binaries, and utilizing them as standard sirens, BBO would determine the Hubble constant to ∼ 0.1%, and the dark energy parameters w0 and wa to ∼ 0.01 and ∼ 0.1, respectively. BBO's dark-energy figure-of-merit would be approximately an order of magnitude better than all other proposed, dedicated dark energy missions.To date, BBO has been designed with the primary goal of searching for gravitational waves from inflation, down to the level ΩGW ∼ 10 −17 ; this requirement determines BBO's frequency band (deci-Hz) and its sensitivity requirement (strain measured to ∼ 10 −24 ). To observe an inflationary GW background, BBO would first have to detect and subtract out ∼ 3 × 10 5 merging compact-star binaries, out to a redshift z ∼ 5. It is precisely this carefully measured "foreground" which would enable high-precision cosmology. BBO would determine the luminosity distance to each binary to ∼ percent accuracy. In addition, BBO's angular resolution would be sufficient to uniquely identify the host galaxy for the majority of binaries; a coordinated optical/infrared observing campaign could obtain the redshifts. Combining the GW-derived distances and the electromagnetically-derived redshifts for such a large sample of objects, out to such high redshift, naturally leads to extraordinarily tight constraints on cosmological parameters. We emphasize that such "standard siren" measurements of cosmology avoid many of the systematic errors associated with other techniques: GWs offer a physics-based, absolute measurement of distance. In addition, we show that BBO would also serve as an exceptionally powerful gravitational lensing mission, and we briefly discuss other astronomical uses of BBO, including providing an early warning system for all short/hard gamma-ray bursts.PACS numbers: 04.30-w,04.80. Nn,95.36.+x,95.35.+d,98.62.Sb,98.80.Es

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Snapping supernovae at z>1.7

Cited by 20 publications

References 96 publications

Atypical Thermonuclear Supernovae from Tidally Crushed White Dwarfs

Atypical Thermonuclear Supernovae from Tidally Crushed White Dwarfs

Can redshift errors bias measurements of the Hubble Constant?

Ultrahigh precision cosmology from gravitational waves

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