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

B. Ren (1) , R. Dong (2) , R. G. Van Holstein (3, 4) , J. -B. Ruffio (1) , B. A. Calvin (1) , J. H. Girard (5) , M. Benisty (6, 7) , A. Boccaletti (8) , T. M. Esposito (9) , Elodie Choquet (10) , D. Mawet (1) , L. Pueyo (5) , T. Stolker (11) , E. Chiang (9) , J. De Boer (3) , J. H. Debes (5) , A. Garufi (12) , C. A. Grady (13) , D. C. Hines (5) , A. -L. Maire (14) , F. Menard (6) , M. A. Millar-Blanchaer (1) , M. D. Perrin (5) , C. A. Poteet (5) , G. Schneider (15)

1 Caltech Department of Astronomy [Pasadena]
2 UVIC - University of Victoria [Canada]
3 Leiden Observatory [Leiden]
4 ESO - European Southern Observatory [Santiago]
5 STSci - Space Telescope Science Institute
6 IPAG - Institut de Planétologie et d'Astrophysique de Grenoble
7 UCHILE - Universidad de Chile = University of Chile [Santiago]
8 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics
9 Department of Astronomy [Berkeley]
10 LAM - Laboratoire d'Astrophysique de Marseille
11 IPA - Institute for Particle Physics and Astrophysics [ETH Zürich]
12 OAA - INAF - Osservatorio Astrofisico di Arcetri
13 GSFC Exoplanets and Stellar Astrophysics Laboratory
14 STAR - Space Sciences, Technologies and Astrophysics Research Institute
15 Steward Observatory

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

Mots clés: YSOs; Infrared sources

Domaines: Planétologie et astrophysique de la terre [astro-ph.EP]; Instrumentation et méthodes pour l'astrophysique [astro-ph.IM]

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⟩