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Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2023

Dynamical detection of a companion driving a spiral arm in a protoplanetary disk

Résumé

Radio and near-infrared observations have observed dozens of protoplanetary disks that host spiral arm features. Numerical simulations have shown that companions may excite spiral density waves in protoplanetary disks via companion-disk interaction. However, the lack of direct observational evidence for spiral-driving companions poses challenges to current theories of companion-disk interaction. Here we report multi-epoch observations of the binary system HD 100453 with the Spectro-Polarimetric High-contrast Exoplanet REsearch (SPHERE) facility at the Very Large Telescope. By recovering the spiral features via robustly removing starlight contamination, we measure spiral motion across 4 yr to perform dynamical motion analyses. The spiral pattern motion is consistent with the orbital motion of the eccentric companion. With this first observational evidence of a companion driving a spiral arm among protoplanetary disks, we directly and dynamically confirm the long-standing theory on the origin of spiral features in protoplanetary disks. With the pattern motion of companion-driven spirals being independent of companion mass, here we establish a feasible way of searching for hidden spiral-arm-driving planets that are beyond the detection of existing ground-based high-contrast imagers.
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hal-04133296 , version 1 (19-06-2023)

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Chen Xie, Bin B. Ren, Ruobing Dong, Élodie Choquet, Arthur Vigan, et al.. Dynamical detection of a companion driving a spiral arm in a protoplanetary disk. Astronomy and Astrophysics - A&A, 2023, 675, pp.L1. ⟨10.1051/0004-6361/202346305⟩. ⟨hal-04133296⟩
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