Fast Methods for Computing Photometric Variability of Eccentric Binaries: Boosting, Lensing, and Variable Accretion
| Autor: | D'Orazio, Daniel J., Duffell, Paul C., Tiede, Christopher |
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| Rok vydání: | 2024 |
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| Druh dokumentu: | Working Paper |
| Popis: | We analyze accretion-rate time series for equal-mass binaries in co-planar gaseous disks spanning a continuous range of orbital eccentricities up to 0.8, for both prograde and retrograde systems. The dominant variability timescales match that of previous investigations; the binary orbital period is dominant for prograde binaries with $e \gtrsim 0.1$, with a 5 times longer "lump" period taking over for $e\lesssim 0.1$. This lump period fades and drops from 5 times to 4.5 times the binary period as $e$ approaches 0.1, where it vanishes. For retrograde orbits, the binary orbital period dominates at $e \lesssim 0.55$ and is accompanied by a 2 times longer-timescale periodicity at higher eccentricities. The shape of the accretion-rate time series varies with binary eccentricity. For prograde systems, the orientation of an eccentric disk causes periodic trading of accretion between the binary components in a ratio that we report as a function of binary eccentricity. We present a publicly available tool, binlite, that can rapidly ($\lesssim 0.01$~sec) generate templates for the accretion-rate time series, onto either binary component, for choice of binary eccentricity below 0.8. As an example use-case, we build lightcurve models where the accretion rate through the circumbinary disk and onto each binary component sets contributions to the emitted specific flux. We combine these rest-frame, accretion-variability lightcurves with observer-dependent Doppler boosting and binary self-lensing. This allows a flexible approach to generating lightcurves over a wide range of binary and observer parameter space. We envision binlite as the access point to a living database that will be updated with state-of-the-art hydrodynamical calculations as they advance. Comment: Comments welcome |
| Databáze: | arXiv |
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