VizieR Online Data Catalog: VLT/SPHERE Y-band images of MWC 758 at two epochs (Ren+, 2020) - Aix-Marseille Université Access content directly
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VizieR Online Data Catalog: VLT/SPHERE Y-band images of MWC 758 at two epochs (Ren+, 2020)

R. Dong
Elodie Choquet
G. Schneider

Abstract

More than a dozen young stars host spiral arms in their surrounding protoplanetary disks. The excitation mechanisms of such arms are under debate. The two leading hypotheses – companion-disk interaction and gravitational instability (GI) – predict distinct motion for spirals. By imaging the MWC 758 spiral arm system at two epochs spanning ∼5 yr using the SPHERE instrument on the Very Large Telescope (VLT), we test the two hypotheses for the first time. We find that the pattern speeds of the spirals are not consistent with the GI origin. Our measurements further evince the existence of a faint “missing planet” driving the disk arms. The average spiral pattern speed is 0.◦22 ± 0.◦03 yr−1, pointing to a driver at 172+18 −14 au around a 1.9 M central star if it is on a circular orbit. In addition, we witness time varying shadowing effects on a global scale that are likely originated from an inner disk
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hal-03582382 , version 1 (21-02-2022)

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B. Ren, R. Dong, R. G. Van Holstein, J. -B. Ruffio, B. A. Calvin, et al.. VizieR Online Data Catalog: VLT/SPHERE Y-band images of MWC 758 at two epochs (Ren+, 2020). 2022. ⟨hal-03582382⟩
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