TY - JOUR
T1 - Dust traps in the protoplanetary disc MWC 758
T2 - Two vortices produced by two giant planets?
AU - Baruteau, Clément
AU - Barraza, Marcelo
AU - Pérez, Sebastián
AU - Casassus, Simon
AU - Dong, Ruobing
AU - Lyra, Wladimir
AU - Marino, Sebastián
AU - Christiaens, Valentin
AU - Zhu, Zhaohuan
AU - Carmona, Andrés
AU - Debras, Florian
AU - Alarcon, Felipe
PY - 2019/6
Y1 - 2019/6
N2 - 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.
AB - 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.
KW - accretion, accretion discs
KW - hydrodynamics
KW - planet-disc interactions
KW - planets and satellites: formation
KW - protoplanetary discs
KW - stars: individual: MWC 758 (HD 36112)
UR - http://www.scopus.com/inward/record.url?scp=85072251558&partnerID=8YFLogxK
U2 - 10.1093/mnras/stz802
DO - 10.1093/mnras/stz802
M3 - Article
AN - SCOPUS:85072251558
SN - 0035-8711
VL - 486
SP - 304
EP - 319
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 1
ER -