[en] 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 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 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.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
van der Plas, G.
Casassus, S.
Ménard, F.
Perez, S.
Thi, W. F.
Pinte, C.
Christiaens, Valentin ; Universidad de Chile > Departamento de Astronomia > Millenium ALMA Disk Nucleus > Form. doct. sc. (Astronomia)
Language :
English
Title :
Spatially Resolved HCN J = 4-3 and CS J = 7-6 Emission from the Disk around HD 142527
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