Spatially resolved HCN J = 4-3 and CS J = 7-6 emission from the disk around HD 142527
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2014-09-10Metadata
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Van der Plas, Gerrit
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Spatially resolved HCN J = 4-3 and CS J = 7-6 emission from the disk around HD 142527
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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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Artículo de publicación ISI.
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URI: https://repositorio.uchile.cl/handle/2250/126480
DOI: doi:10.1088/2041-8205/792/2/L25
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The Astrophysical Journal Letters, 792:L25 (5pp), 2014 September 10
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