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We describe the SQuIGGLE survey of intermediate-redshift post-starburstgalaxies. We leverage the large sky coverage of the SDSS to select ~1300recently-quenched galaxies at 0.5<z<~0.9 based on their unique spectral shapes.These bright, intermediate-redshift galaxies are ideal laboratories to studythe physics responsible for the rapid quenching of star formation: they aredistant enough to be useful analogs for high-redshift quenching galaxies, butlow enough redshift that multi-wavelength follow-up observations are feasiblewith modest telescope investments. We use the Prospector code to infer thestellar population properties and non-parametric star formation histories ofall galaxies in the sample. We find that SQuIGGLE galaxies are both verymassive (M* ~ 10^11.25 Msun) and quenched, with inferred star formation rates<~1Msun/yr, more than an order of magnitude below the star-forming mainsequence. The best-fit star formation histories confirm that these galaxiesrecently quenched a major burst of star formation: >75% of SQuIGGLE galaxiesformed at least a quarter of their total stellar mass in the recent burst,which ended just ~200Myr before observation. We find that SQuIGGLE galaxies areon average younger and more burst-dominated than most other z<~1 post-starburstsamples. This large sample of bright post-starburst galaxies at intermediateredshift opens a wide range of studies into the quenching process. Inparticular, the full SQuIGGLE survey will investigate the molecular gasreservoirs, morphologies, kinematics, resolved stellar populations, AGNincidence, and infrared properties of this unique sample of galaxies in orderto place definitive constraints on the quenching process.

SQuIGGLE: Studying Quenching in Intermediate-z Galaxies -- Gas, AnguLar Momentum, and Evolution