Papers › Simulations of astrometric planet detection in Alpha Centauri by intensity interferometry
Simulations of astrometric planet detection in Alpha Centauri by intensity interferometry
Km Nitu Rai, Subrata Sarangi, Prasenjit Saha, Soumen Basak
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Recent dynamical studies indicate that the possibility of an Earth-like planet around αCen A or B should be taken seriously. Such a planet, if it exists, would perturb the orbital astrometry by <10 μas, which is 10⁻⁶ of the separation between the two stars. We assess the feasibility of detecting such perturbations using ground-based intensity interferometry. We simulate a dedicated setup consisting of four 40-cm telescopes equipped with photon counters and correlators with time resolution 0.1 ns, and a sort of matched filter implemented through an aperture mask. The astrometric error from one night of observing αCen AB is ≈0.5 mas. The error decreases if longer observing times and multiple spectral channels are used, as (channels×nights)^(-1/2).
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