Speaker
Description
Millisecond pulsars are among the most precise clocks in the Universe. The triple system PSR J0337+1715, composed of a neutron star and two white dwarfs, is a unique gravitational laboratory, that enables excellent tests of the Strong Equivalence Principle (SEP). With microsecond-level timing precision, even tiny deviations from theoretical models become detectable. However, recent analyses reveal coherent, low-frequency structure in the timing residuals that cannot be fully explained by standard models. Do these discrepancies arise from unmodeled astrophysical effects, such as interstellar medium (ISM) perturbations or an additional planetary companion, or do they hint at new gravitational physics, potentially mimicking a SEP violation signal? In this project, I reproduce the full timing pipeline of Voisin et al. 2025, implementing their three-body dynamical model and fitting framework, to ensure consistency with the published results. After validating the model, I extend the dataset by incorporating additional times of arrival from the observations of Archibald et al. 2018, allowing a direct assessment of how the residual structure evolves with new data coverage. In this presentation, I will present the current status of the modeling efforts and discuss whether the residual structure can be explained astrophysically or remains a candidate signature of new gravitational physics.
| Talk category | NOVA Network 3 |
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