Redback/Black Widow Systems as progenitors of the highest neutron star masses and low-mass Black Holes

Horvath, J. E.; Bernardo, A.; Rocha, L. S.; Valentim, R.; Moraes, P. H. R. S.; Avellar, Marcio G. B. de

doi:10.1007/s11433-020-1593-0

Cited by 7 publications

(6 citation statements)

References 8 publications

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“…In terms of how this gap is partially filled, binary population synthesis may help to examine the role different compact object formation channels play. While an inefficiency or inability of core-collapse supernovae to produce gap objects has been linked to convection timescales and fallback amounts (Zevin et al 2020;Liu et al 2021;Fryer et al 2022;Olejak et al 2022), another process might still be able to play this "gap filling" role, such as the accretion induced collapse of NSs into BHs in redback/black widow binaries (Horvath et al 2020); NS-NS mergers (Gupta et al 2020), of which the Galaxy should harbor ∼10 4 remnants using the simplest merger rate estimate, or the double-degenerate accretion induced collapse of white dwarfs into massive NSs (Wang & Liu 2020). The relative contribution of each one remains to be investigated in full.…”

Section: Discussionmentioning

confidence: 99%

Quantifying the Evidence Against a Mass Gap between Black Holes and Neutron Stars

Sá¹,

Bernardo²,

Bachega³

et al. 2022

ApJ

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The lack of objects between 2 and 5 M ⊙ in the joint mass distribution of compact objects has been termed the “mass gap,” and attributed mainly to the characteristics of the supernova mechanism precluding their birth. However, recent observations show that a number of candidates reported to lie inside the “gap” may fill it, suggesting instead a paucity that may be real or largely a result of small number statistics. We quantify in this work the individual candidates and evaluate the joint probability of a mass gap. Our results show that an absolute mass gap is not present, to a very high confidence level. It remains to be seen if a relative paucity of objects stands in the future, and how this population can be related to the formation processes, which may include neutron star mergers, the collapse of a neutron star to a black hole, and others.

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Section: Discussionmentioning

confidence: 99%

Quantifying the Evidence Against a Mass Gap between Black Holes and Neutron Stars

Sá¹,

Bernardo²,

Bachega³

et al. 2022

ApJ

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“…We have presented a few representative examples of self-bound stellar models, two sequences of the isotropic pressure class with different EoS, and two anisotropic sequences of the same model corresponding to different sets of parameters of one model, with the aim of showing a general feature that became likely important for an explanation of a ≥ 2.5M object in the event GW190814. Even though the latter is not confirmed to be a compact star, and may well be a black hole, there are arguments to believe that we should be prepared to find an explanation for a high mass, as suggested by other measurements in binaries 5 . In fact, this possibility has already been considered by Bombaci et al 10 and Wu et al 11 among others.…”

Section: Discussionmentioning

confidence: 77%

“…A few higher measured values exist, although they have been extracted using methods not generally as reliable. Anyhow it has been argued that a handful of compact stars in the group of interacting "redback/black widow" systems may achieve masses greater than the MSP J0740+6620 4 , and possibly all the way up to the maximum TOV value, due to their evolutionary histories 5 . It is even possible to produce some "low-mass" black holes if some of these systems push the mass of the accreting pulsar over the TOV limit.…”

Section: Introductionmentioning

confidence: 99%

Modelling a $2.5 \, M_{\odot}$ Compact Star with Quark Matter

Horvath,

Moraes

2020

Preprint

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The detection of an unexpected ∼ 2.5M component in the gravitational wave event GW190814 has puzzled the community of High-Energy astrophysicists, since in the absence of further information it is not clear whether this is the heaviest "neutron star" ever detected or either the lightest black hole known, of a kind absent in the local neighbourhood. We show in this work a few possibilities for a model of the former, in the framework of three different quark matter models with and without anisotropy in the interior pressure. As representatives of classes of "exotic" solutions, we show that even though the stellar sequences may reach this ballpark, it is difficult to fulfill simultaneously the constraint of the radius as measured by the NICER team for the pulsar PSR J0030+0451. Thus, and assuming both measurements stand, compact neutron stars can not be all made of self-bound quark matter, even within anisotropic solutions which boost the maximum mass well above the ∼ 2.5M figure. We also point out that a very massive compact star will limit the absolute maximum matter density in the present Universe to be less than 6 times the nuclear saturation value.

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“…Based on that, and provided the fraction of the donated mass ending onto the NS is not too small, it is expected that ∼1 M ⊙ could be added to the NS. It is even possible that in some cases the NS is pushed over the M TOV limit, no matter how high the latter is, and form a low‐mass black hole (Horvath et al 2020). The difficulties for the identification of such extreme cases are many, but within this scenario we may expect that redbacks and their descendants black widows are very massive, an expectation confirmed by several mass determinations (Table 1).…”

Section: Determination Of Ns Massesmentioning

confidence: 99%

Neutron stars origins and masses

et al. 2021

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We present in this talk an overview of the neutron star origin events and masses. Using the existing sample of ∼80 measured neutron star masses, we show that the distribution requires more than one mass-scale and that its highest value inferred from the sample is compatible with 2.5M ⊙ , suggesting that very heavy neutron stars may be present in Nature. The case of some "spider" systems and the enigmatic high-mass object in the GW190408 event, as well as the highest measured values from other binaries may support a high M max. Finally, we review the connection of supernovae compact remnants with the observed masses and discuss some important features still unclear from simulations related to the former problem of the mass origins.

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Redback/Black Widow Systems as progenitors of the highest neutron star masses and low-mass Black Holes

Cited by 7 publications

References 8 publications

Quantifying the Evidence Against a Mass Gap between Black Holes and Neutron Stars

Quantifying the Evidence Against a Mass Gap between Black Holes and Neutron Stars

Modelling a $2.5 \, M_{\odot}$ Compact Star with Quark Matter

Neutron stars origins and masses

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