Spectroastrometry with photonic lanterns

Yoo Jung Kim; Stephanie Sallum; Jonathan Lin; Yinzi Xin; Barnaby Norris; Christopher Betters; Sergio Leon-Saval; Julien Lozi; Sebastian Vievard; Pradip Gatkine; Olivier Guyon; Nemanja Jovanovic; Dimitri Mawet; Michael P. Fitzgerald

doi:10.1117/12.2630635

29 August 2022 Spectroastrometry with photonic lanterns

Yoo Jung Kim, Stephanie Sallum, Jonathan Lin, Yinzi Xin, Barnaby Norris, Christopher Betters, Sergio Leon-Saval, Julien Lozi, Sebastian Vievard, Pradip Gatkine, Olivier Guyon, Nemanja Jovanovic, Dimitri Mawet, Michael P. Fitzgerald

Author Affiliations +

Proceedings Volume 12184, Ground-based and Airborne Instrumentation for Astronomy IX; 1218449 (2022) https://doi.org/10.1117/12.2630635
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

New frontiers of astronomical science push the imaging capabilities of modern AO-equipped telescopes. However, precision measurement at the diffraction limit is made challenging by time-varying residual aberrations in AO-corrected wavefronts. Photonic lanterns (PLs) are a novel technology whose spatial filtering and coherence properties may be exploited to enable new capabilities in precision measurement at the diffraction limit. We aim to determine the potential of AO-fed PL fiber spectrometers for spectroastrometry. We define spectroastrometric signals for a 6-port PL and perform numerical simulations to calculate expected signals for a binary point source model, as a function of contrast, separation, and position angle. In addition, we simulate the effects of AO residual wavefront error on spectroastrometric signals. We also present simulated spectroastrometric signals for accreting planets, which are expected to show strong hydrogen emission lines.

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Yoo Jung Kim, Stephanie Sallum, Jonathan Lin, Yinzi Xin, Barnaby Norris, Christopher Betters, Sergio Leon-Saval, Julien Lozi, Sebastian Vievard, Pradip Gatkine, Olivier Guyon, Nemanja Jovanovic, Dimitri Mawet, and Michael P. Fitzgerald "Spectroastrometry with photonic lanterns", Proc. SPIE 12184, Ground-based and Airborne Instrumentation for Astronomy IX, 1218449 (29 August 2022); https://doi.org/10.1117/12.2630635

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