Spatially Resolved HCN J = 4-3 and CS J = 7-6 Emission from the Disk around HD 142527 Article - 2014

G. van Der Plas, S. Casassus, F. Ménard, S. Perez, W. F. Thi, C. Pinte, V. Christiaens

G. van Der Plas, S. Casassus, F. Ménard, S. Perez, W. F. Thi, C. Pinte, V. Christiaens, « Spatially Resolved HCN J = 4-3 and CS J = 7-6 Emission from the Disk around HD 142527  », The Astrophysical Journal Letters, 2014

Abstract

The disk around HD 142527 attracts a great amount of attention compared to others because of its resolved (sub-)millimeter dust continuum that is concentrated into the shape of a horseshoe toward the north of the star. In this Letter we present spatially resolved ALMA detections of the HCN J = 4-3 and CS J = 7-6 emission lines. These lines give us a deeper view into the disk compared to the (optically thicker) CO isotopes. This is the first detection of CS J = 7-6 coming from a protoplanetary disk. Both emission lines are azimuthally asymmetric and are suppressed under the horseshoe-shaped continuum emission peak. A possible mechanism for explaining the decrease under the horseshoe-shaped continuum is the increased opacity coming from the higher dust concentration at the continuum peak. Lower dust and/or gas temperatures and an optically thick radio-continuum reduce line emission by freezing out and shielding emission from the far side of the disk.

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