ALMA Observations of Anisotropic Dust Mass Loss around VY CMa
Paper in proceedings, 2015

We present high resolution ALMA Science Verification data of the continuum emission around the highly evolved oxygen-rich red supergiant VY CMa. These data enable us to study the dust in its inner circumstellar environment at a spatial resolution of 129 mas at 321 GHz and 59 mas at 658 GHz, thus allowing us to trace dust on spatial scales down to 11 R-star (71 AU). Two prominent dust components are detected and resolved. We find that at least 17% of the dust mass around VY CMa is located in clumps ejected within a more quiescent roughly spherical stellar wind, with a quiescent dust mass loss rate of 5 x 10(-6) M-circle dot yr(-1). The anisotropic morphology of the dust indicates a continuous, directed mass loss over a few decades, suggesting that this mass loss cannot be driven by large convection cells alone.

Author

Eamon O Gorman

Chalmers, Earth and Space Sciences, Radio Astronomy and Astrophysics

Wouter Vlemmings

Chalmers, Earth and Space Sciences, Onsala Space Observatory

A. M. S. Richards

A. Baudry

Elvire De Beck

Chalmers, Earth and Space Sciences, Onsala Space Observatory

L. Decin

G. M. Harper

E. M. Humphreys

P. Kervella

Theo Khouri

Chalmers, Earth and Space Sciences, Radio Astronomy and Astrophysics

Sebastien Muller

Chalmers, Earth and Space Sciences, Onsala Space Observatory

4th ALMA Science Conference on Revolution in Astronomy with ALMA: The Third Year, Tokyo, Japan, 8-11 December

Vol. 499 335-336

Subject Categories

Astronomy, Astrophysics and Cosmology

Infrastructure

Onsala Space Observatory

ISBN

978-1-58381-883-1

More information

Created

10/7/2017