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Analysis shows cadences of ~15 minutes resolve degeneracy in binary sources for wide-orbit planets, indicating effectiveness of GBTDS.
Wide-orbit planets are particularly sensitive to detection by the Roman Galactic Bulge Time Domain Survey (GBTDS). This study investigates the degeneracy of these events with binary sources, focusing on how observation cadence affects the resolution of these degeneracies. We analyzed the impact of various cadences from ( 3.6 minutes ) − 1 to (5 hr) −1 , which encompasses planned cadences for both the GBTDS and cadences used by ground-based surveys like KMTNet. The results show that a ∼ ( 15 minutes ) − 1 cadence is generally sufficient to resolve this degeneracy unless the source star is a giant ( ρ ≳ 0.01).
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Sangtarash et al. (2025) studied this question.
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