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

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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https://hal-insu.archives-ouvertes.fr/insu-03618541
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Submitted on : Thursday, March 24, 2022 - 2:05:51 PM
Last modification on : Thursday, May 12, 2022 - 8:56:01 AM

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G. van Der Plas, S. Casassus, F. Ménard, S. Perez, W. F. Thi, et al.. Spatially Resolved HCN J = 4-3 and CS J = 7-6 Emission from the Disk around HD 142527. The Astrophysical Journal Letters, 2014, 792, ⟨10.1088/2041-8205/792/2/L25⟩. ⟨insu-03618541⟩

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