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We analyzed the archival data of the continuum emission at six wavelengthsfrom 3 to 0.4 mm and 13CO and C18O (1-0, 2-1, and 3-2) lines in theprotoplanetary disk around HD 142527 obtained with the Atacama LargeMillimeter/submillimeter Array. We performed fitting to the spectral energydistributions obtained at the six wavelengths with the gray-body slab models toestimate the distributions of the dust surface density and spectral index ofdust absorption coefficient beta. We also estimated the distribution of the gascolumn density by fitting the C18O spectra and measured the disk rotation byfitting the Keplerian disk models to the C18O data. We found super- andsub-Keplerian rotation inside and outside the dust ring in the northwest in theHD 142527 disk, suggestive of the presence of a local pressure bump. Incomparison with our estimated dust and gas distributions, the location of thepressure bump is coincident with the region showing a three times higher dustdensity and a three times lower gas-to-dust mass ratio than the mean values inthe disk, suggesting dust trapping in the pressure bump. Nevertheless, there isno correlation between our derived beta distribution and the location of thepressure bump. In addition, we found that the width of the dust ring iscomparable or larger than the width of the pressure bump, which could suggestthat dust feedback is significant in the pressure bump.

Kinematical signs of dust trapping and feedback in a local pressure bump in the protoplanetary disk around HD 142527 revealed with ALMA