circumstellar matter; stars: individual: HD142527; submillimetre:; planetary systems; accretion; accretion discs; Astrophysics - Earth and; Planetary Astrophysics; Astrophysics - Astrophysics of Galaxies; Astrophysics - Solar and Stellar Astrophysics
Abstract :
[en] We present ALMA observations of the <SUP>12</SUP>CO, <SUP>13</SUP>CO, C<SUP>18</SUP>O J = 2-1 transitions and the 1.3 mm continuum emission for the circumbinary disc around HD 142527, at an angular resolution of ≈ 0${_{.}^{\prime\prime}}$3. We observe multiple spiral structures in intensity, velocity, and velocity dispersion for the <SUP>12</SUP>CO and <SUP>13</SUP>CO gas tracers. A newly detected <SUP>12</SUP>CO spiral originates from the dust horseshoe, and is rotating at super-Keplerian velocity or vertically ascending, whilst the interspiral gas is rotating at sub-Keplerian velocities. This new spiral possibly connects to a previously identified spiral, thus spanning >360°. A spatial offset of 30 au is observed between the <SUP>12</SUP>CO and <SUP>13</SUP>CO spirals, to which we hypothesize that the gas layers are propagating at different speeds (surfing) due to a non-zero vertical temperature gradient. Leveraging the varying optical depths between the CO isotopologues, we reconstruct temperature and column density maps of the outer disc. Gas surface density peaks at r ≈ 180 au, coincident with the peak of continuum emission. Here, the dust grains have a Stokes number of ≈ 1, confirming radial and azimuthal trapping in the horseshoe. We measure a cavity radius at half-maximum surface density of ≈ 100 au, and a cavity eccentricity between 0.3 and 0.45.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Garg, H.; Monash University, School of Astrophysics
Pinte, C.; Monash University, School of Astrophysics, Institute de Planetologie et d'Astrophysique de Grenoble
Christiaens, Valentin ; Université de Liège - ULiège > Unités de recherche interfacultaires > Space sciences, Technologies and Astrophysics Research (STAR) ; Monash University, School of Astrophysics
Price, D. J.; Monash University, School of Astrophysics
Lazendic, J. S.; Monash University, School of Astrophysics
Boehler, Y.; Institute de Planetologie et d'Astrophysique de Grenoble
Casassus, S.; University of Chile, Department of Astronomy
Marino, S.; University of Cambridge, Institute of Astronomy
Perez, S.; Universidad de Santiago de Chile, Av. Libertador Bernardo O'Higgins 3363, Estación Central, Santiago, Chile
Zuleta, A.; University of Chile, Department of Astronomy
Language :
English
Title :
Non-Keplerian spirals, a gas-pressure dust trap, and an eccentric gas cavity in the circumbinary disc around HD 142527
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