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Simulations of astrometric planet detection in Alpha Centauri by intensity interferometry by Rai, Km Nitu; Sarangi, Subrata; Saha, Prasenjit; Basak, Soumen is a scholarly article available to read on EtoBox.

What is Simulations of astrometric planet detection in Alpha Centauri by intensity interferometry about?

Recent dynamical studies indicate that the possibility of an Earth-like planet around $\alpha\;$Cen A or B should be taken seriously. Such a planet, if it exists, would perturb the orbital astrometry by $<10 \ {\mu}\rm as$, 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 $0.1\,\rm ns$, and a sort of matched filter implemented through an aperture mask. The astrometric error from one night of observing $\alpha\;$Cen AB is $\approx0.5\,\rm mas$. The error decreases if longer observing times and multiple spectral channels are used, as $(\hbox{channels}\times\hbox{nights})^{-1/2}$.

Author

Rai, Km Nitu; Sarangi, Subrata; Saha, Prasenjit; Basak, Soumen

Published

2022

Language

EN