Dynamical evidence of a spiral arm–driving planet in the MWC 758 protoplanetary disk
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2020Metadata
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Ren, Bin
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Dynamical evidence of a spiral arm–driving planet in the MWC 758 protoplanetary disk
Author
- Ren, Bin;
- Dong, Ruobing;
- van Holstein, Rob G.;
- Ruffio, Jean Baptiste;
- Calvin, Benjamín A.;
- Girard, Julien H.;
- Benisty, Myriam;
- Boccaletti, Anthony;
- Espósito, Thomas M.;
- Choquet, Elodie;
- Mawet, Dimitri;
- Pueyo, Laurent;
- Stolker, Tomas;
- Chiang, Eugene;
- de Boer, Jozua;
- Debes, John H.;
- Garufi, Antonio;
- Grady, Carol A.;
- Hines, Dean C.;
- Maire, Anne-Lise;
- Menard, Francoise;
- Millar-Blanchaer, Maxell A.;
- Perrin, Marshall D.;
- Poteet, Charles A.;
- Schneider, Glenn;
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 similar to 5 yr using the SPHERE instrument on the Very Large Telescope, 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 degrees.22.+/-.0 degrees. 03 yr(-1), pointing to a driver at 172(-14)(+18) au around a 1.9 M-circle dot central star if it is on a circular orbit. In addition, we witness time-varying shadowing effects on a global scale that are likely originating from an inner disk.
Patrocinador
National Aeronautics & Space Administration (NASA)
NNX15AD95G/NEXSS
NNX15AC89G
National Science Foundation (NSF)
AST-1518332
Fonds de la Recherche Scientifique - FNRS
W.M. Keck Foundation
ESO programmes
060.A-9389(A)
104.C-0472(A)
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Artículo de publicación ISI Artículo de publicación SCOPUS
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Astrophysical Journal Letters, 898 (2020): L38
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