article published yes Kevin S Park author c0a7603b-66e5-11f0-aaf9-b02edf8b2969 Zoltán Haiman author 7c006e8c-cc0d-11ee-8322-cb904ef76f360000-0003-3633-5403 Chengcheng Xin author Tzuken Shen author Ashley Villar author Jordy Davelaar author GradSch department ZoHa department The Vera C. Rubin Observatory has now seen first light, and over a 10 year duration, Legacy Survey of Space and Time (LSST) is projected to catalog tens of millions of quasars, many of which are expected to be associated with subparsec supermassive black hole binaries (SMBHBs). Out of these SMBHBs, up to thousands of relatively massive binary-quasars are expected to exhibit gravitational self-lensing flares (SLFs) that last for at least 20–30 days. We assess the effectiveness of the Lomb-Scargle (LS) periodogram and matched filters (MFs) as methods for systematic searches for these binaries, using toy-models of hydrodynamical, Doppler, and self-lensing variability from equal-mass, eccentric SMBHBs. We inject SLFs into random realizations of damped random walk (DRW) lightcurves, representing stochastic quasar variability, and compute the LS periodogram with and without the SLF. We find that periodograms of SLF+DRW light-curves do not have maximum peak heights that could not arise from DRW-only periodograms. On the other hand, the matched filter signal-to-noise ratio (SNR) can distinguish SLFs from noise even with LSST-like cadences and DRW noise. Furthermore, we develop a three-step procedure with matched filters, which can also recover injected binary parameters from these light-curves. We expect this method to be computationally efficient enough to be applicable to millions of quasar light-curves in LSST. https://research-explorer.ista.ac.at/download/23159/23167/2026_PhysicalReviewD_Park.pdf application/pdfno American Physical Society2026 eng 2470-0010 2470-0029 2512.0842710.1103/p328-62sl 1134 Park, K. S., Haiman, Z., Xin, C., Shen, T., Villar, A., &#38; Davelaar, J. (2026). Self-lensing flares from black hole binaries. V. Systematic searches in LSST. <i>Physical Review D</i>. American Physical Society. <a href="https://doi.org/10.1103/p328-62sl">https://doi.org/10.1103/p328-62sl</a> Park, Kevin S., et al. “Self-Lensing Flares from Black Hole Binaries. V. Systematic Searches in LSST.” <i>Physical Review D</i>, vol. 113, no. 4, 043055, American Physical Society, 2026, doi:<a href="https://doi.org/10.1103/p328-62sl">10.1103/p328-62sl</a>. Park KS, Haiman Z, Xin C, Shen T, Villar A, Davelaar J. 2026. Self-lensing flares from black hole binaries. V. Systematic searches in LSST. Physical Review D. 113(4), 043055. K. S. Park, Z. Haiman, C. Xin, T. Shen, A. Villar, and J. Davelaar, “Self-lensing flares from black hole binaries. V. Systematic searches in LSST,” <i>Physical Review D</i>, vol. 113, no. 4. American Physical Society, 2026. Park KS, Haiman Z, Xin C, Shen T, Villar A, Davelaar J. Self-lensing flares from black hole binaries. V. Systematic searches in LSST. <i>Physical Review D</i>. 2026;113(4). doi:<a href="https://doi.org/10.1103/p328-62sl">10.1103/p328-62sl</a> K.S. Park, Z. Haiman, C. Xin, T. Shen, A. Villar, J. Davelaar, Physical Review D 113 (2026). Park, Kevin S, Zoltán Haiman, Chengcheng Xin, Tzuken Shen, Ashley Villar, and Jordy Davelaar. “Self-Lensing Flares from Black Hole Binaries. V. Systematic Searches in LSST.” <i>Physical Review D</i>. American Physical Society, 2026. <a href="https://doi.org/10.1103/p328-62sl">https://doi.org/10.1103/p328-62sl</a>. 231592026-10-18T22:01:53Z2026-10-19T08:08:21Z