Robustly detecting changes in warm Jupiters' transit impact parameters

Abstract

Torques from a mutually inclined perturber can change a transiting planet's impact parameter, resulting in variations in the transit shape and duration. Detection of and upper limits on changes in impact parameter yield valuable constraints on a planetary system's three dimensional architecture. Constraints for warm Jupiters are particularly interesting because they allow us to test origins theories that invoke a mutually inclined perturber. Because of warm Jupiters' high signal-to-noise transits, changes in impact parameter are feasible to detect. However, here we show that allowing the impact parameter to vary uniformly and independently from transit to transit leads to incorrect inferences about the change, propagating to incorrect inferences about the perturber. We demonstrate that an appropriate prior on the change in impact parameter mitigates this problem. We apply our approach to eight systems from the literature and find evidence for changes in impact parameter for warm Jupiter Kepler-46b. We conclude with our recommendations for light curve fitting, including when to fit impact parameters vs. transit durations.

Accepted by AJ

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Cited by in corpus (7)

• Precise transit and radial-velocity characterization of a resonant pair: a warm Jupiter TOI-216c and eccentric warm Neptune TOI-216b
• TESS Observations of the Hot Jupiter Exoplanet XO-6b: No Evidence of Transit Timing Variations
• Systematic search for long-term transit duration changes in Kepler transiting planets
• Accurate modeling of grazing transits using umbrella sampling
• Revisiting the Architecture of the KOI-89 System
• Transit Depth Variations Reveal TOI-216 b to be a Super-Puff
• Evidence for a Non-Dichotomous Solution to the Kepler Dichotomy: Mutual Inclinations of Kepler Planetary Systems from Transit Duration Variations