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  Dust traps in the protoplanetary disc MWC 758: two vortices produced by two giant planets?

Baruteau, C., Barraza, M., Pérez, S., Casassus, S., Dong, R., Lyra, W., et al. (2019). Dust traps in the protoplanetary disc MWC 758: two vortices produced by two giant planets? Monthly Notices of the Royal Astronomical Society, 486, 304-319.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-D429-E Version Permalink: http://hdl.handle.net/21.11116/0000-0005-D42A-D
Genre: Journal Article

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 Creators:
Baruteau, Clément1, Author
Barraza, Marcelo1, Author
Pérez, Sebastián1, Author
Casassus, Simon1, Author
Dong, Ruobing1, Author
Lyra, Wladimir1, Author
Marino, Sebastián1, Author
Christiaens, Valentin1, Author
Zhu, Zhaohuan1, Author
Carmona, Andrés1, Author
Debras, Florian1, Author
Alarcon, Felipe1, Author
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: accretion accretion discs hydrodynamics planets and satellites: formation planet-disc interactions protoplanetary discs stars: individual: MWC 758 (HD 36112) Astrophysics - Earth and Planetary Astrophysics Astrophysics - Solar and Stellar Astrophysics
 Abstract: Resolved ALMA and VLA observations indicate the existence of two dust traps in the protoplanetary disc MWC 758. By means of two-dimensional gas+dust hydrodynamical simulations post-processed with three- dimensional dust radiative transfer calculations, we show that the spirals in scattered light, the eccentric, asymmetric ring and the crescent-shaped structure in the (sub)millimetre can all be caused by two giant planets: a 1.5-Jupiter mass planet at 35 au (inside the spirals) and a 5-Jupiter mass planet at 140 au (outside the spirals). The outer planet forms a dust-trapping vortex at the inner edge of its gap (at ~85 au), and the continuum emission of this dust trap reproduces the ALMA and VLA observations well. The outer planet triggers several spiral arms that are similar to those observed in polarized scattered light. The inner planet also forms a vortex at the outer edge of its gap (at ~50 au), but it decays faster than the vortex induced by the outer planet, as a result of the disc's turbulent viscosity. The vortex decay can explain the eccentric inner ring seen with ALMA as well as the low signal and larger azimuthal spread of this dust trap in VLA observations. Finding the thermal and kinematic signatures of both giant planets could verify the proposed scenario.

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 Dates: 2019
 Publication Status: Published in print
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Title: Monthly Notices of the Royal Astronomical Society
Source Genre: Journal
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Pages: - Volume / Issue: 486 Sequence Number: - Start / End Page: 304 - 319 Identifier: -