Improved gravitational radiation time-scales: significance for LISA and LIGO-Virgo sources

Zwick, Lorenz; Capelo, Pedro R.; Bortolas, Elisa; Mayer, Lucio; Amaro-Seoane, Pau

doi:10.1093/mnras/staa1314

Cited by 37 publications

(29 citation statements)

References 47 publications

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“…On the binary migration, as it shrinks, the velocity of the secondary will deviate from Peters' formula due to higher-order post-Newtonian effects. In our system of interest, since we are considering circular binaries at already close separations, this deviation is at most a factor of two (Zwick et al 2020).…”

Section: Discussionmentioning

confidence: 99%

The effect of cooling on the accretion of circumprimary discs in merging supermassive black hole binaries

Fontecilla

Lodato

Cuadra

2020

Monthly Notices of the Royal Astronomical Society

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At the final stages of a supermassive black hole coalescence, the emission of gravitational waves will efficiently remove energy and angular momentum from the binary orbit, allowing the separation between the compact objects to shrink. In the scenario where a circumprimary disc is present, a squeezing phase will develop, in which the tidal interaction between the disc and the secondary black hole could push the gas inwards, enhancing the accretion rate on to the primary and producing what is known as an electromagnetic precursor. In this context, using 3D hydrodynamic simulations, we study how an adiabatic circumprimary accretion disc responds to the varying gravitational potential as the secondary falls onto the more massive object. We included a cooling prescription controlled by the parameter β = Ωtcool, which will determine how strong the final accretion rate is: a hotter disc is thicker, and the tidal interaction is suppressed for the gas outside the binary plane. Our main results are that for scenarios where the gas cannot cool fast enough (β ≥ 30) the disc becomes thick and renders the system invisible, while for β ≤ 10 the strong cooling blocks any leakage on to the secondary’s orbit, allowing an enhancement in the accretion rate two orders of magnitude stronger than the average through the rest of the simulation.

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Section: Discussionmentioning

confidence: 99%

The effect of cooling on the accretion of circumprimary discs in merging supermassive black hole binaries

Fontecilla

Lodato

Cuadra

2020

Monthly Notices of the Royal Astronomical Society

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“…These events may give rise to detectable gravitational wave signals (the so-called EMRIs, see e.g. Zwick et al 2020Zwick et al , 2021Vázquez-Aceves et al 2021) but they are not TDEs. 1…”

Section: Compact Stellar Remnantsmentioning

confidence: 99%

Tidal disruption events in post-starburst galaxies: the importance of a complete stellar mass function

Bortolas

2022

Preprint

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A tidal disruption event (TDE) occurs when a star is destroyed by the strong tidal shear of a massive black hole (MBH). The accumulation of TDE observations over the last years has revealed that poststarburst galaxies are significantly overrepresented in the sample of TDE hosts. Here we address the poststarburst preference by investigating the decline of TDE rates in a Milky-Way like nuclear stellar cluster featuring either a monochromatic (1 M ) or a complete, evolved stellar mass function. In the former case, the decline of TDE rates with time is very mild, and generally up to a factor of a few in 10 Gyr. Conversely, if a complete mass function is considered, a strong TDE burst over the first 0.1 − 1 Gyr is followed by a considerable rate drop, by at least an order of magnitude over 10 Gyr. The decline starts after a mass segregation timescale, and it is more pronounced assuming a more top-heavy initial mass function and/or an initially denser nucleus. Our results thus suggest that the poststarburst preference can be accounted for in realistic systems featuring a complete stellar mass function, even in moderately dense galactic nuclei. Overall, our findings support the idea that starbursting galactic nuclei are characterized by a top-heavy initial mass function; we speculate that accounting for this can reconcile the discrepancy between observed and theoretically predicted TDE rates even in quiescent galaxies.

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“…Yet, the following results are not very sensitive to the precise numerical value. The time to coalescence can be estimated as [62,63]…”

Section: Application To Black Hole Binary Formationmentioning

confidence: 99%

Flipping spins in mass transferring binaries and origin of spin-orbit misalignment in binary black holes

Stegmann

Antonini

2021

Phys. Rev. D

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Close stellar binaries are prone to undergo a phase of stable mass transfer in which a star loses mass to its companion. Assuming that the donor star loses mass along the instantaneous interstellar axis, we derive the orbit-averaged equations of motion describing the evolution of the donor rotational angular momentum vector (spin) that accompanies the transfer of mass. We consider: (i) a model in which the mass transfer rate is constant within each orbit and (ii) a phase-dependent rate in which all mass per orbit is lost at periapsis. In both cases, we find that the ejection of ≳30 percent of the donor's initial mass causes its spin to nearly flip onto the orbital plane of the binary, independently of the initial spin-orbit alignment. Moreover, we show that the spin flip due to mass transfer can easily dominate over tidal synchronization in any giant stars and main-sequence stars with masses ∼1.5 to 5 M ⊙ . Finally, the general equations of motion, including tides, are used to evolve a realistic population of massive binary stars, leading to the formation of binary black holes. Assuming that the stellar core and envelope are fully coupled, the resulting tilt of the first-born black hole reduces its spin projection onto the orbit normal by a factor ∼Oð0.1Þ. This result supports previous studies in favor of an insignificant contribution to the effective spin projection, χ eff , in binary black holes formed from the evolution of field binaries.

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Improved gravitational radiation time-scales: significance for LISA and LIGO-Virgo sources

Cited by 37 publications

References 47 publications

The effect of cooling on the accretion of circumprimary discs in merging supermassive black hole binaries

The effect of cooling on the accretion of circumprimary discs in merging supermassive black hole binaries

Tidal disruption events in post-starburst galaxies: the importance of a complete stellar mass function

Flipping spins in mass transferring binaries and origin of spin-orbit misalignment in binary black holes

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