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Measuring Type Ia Supernova Angular-Diameter Distances with Intensity Interferometry
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abstract
This paper investigates the potential of intensity interferometry, based on the Hanbury Brown-Twiss effect, for measuring supernova sizes and distances. Through optimized telescope positioning, observing strategy, and advancements in single-photon detection technology, this method can provide precise angular size measurements of Type Ia supernovae as bright as 12~mag, corresponding to a local volume out to $z\sim0.004$, with an anticipated rate of $\sim 1$ events per year. The combination of angular size data with known physical dimensions enables accurate distance determination. Multiple telescope pairs at different relative positions allow tomographic mapping of the ejecta structure while reducing distance uncertainties. As Type Ia supernovae serve as standardizable candles for measuring the Universe's expansion history, combining intensity interferometry distances with the supernova Hubble diagram facilitates measurements of the Hubble constant $H_0$.
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Expanding Ejecta Method: II. Framework for Cosmological Distance Measurements via Intensity Interferometry
Geometric supernova distances from intensity interferometry could calibrate the distance ladder and measure H0 to between 0.4% and 9% depending on instrument capability and application, all without luminosity calibration.
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