Vortex-like kinematic signal, spirals, and beam smearing effect in the HD 142527 disk

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dc.citation.articleNumberA59en_US
dc.citation.journalTitleAstronomy & Astrophysicsen_US
dc.citation.volumeNumber650en_US
dc.contributor.authorBoehler, Y.en_US
dc.contributor.authorMénard, F.en_US
dc.contributor.authorRobert, C. M. T.en_US
dc.contributor.authorIsella, A.en_US
dc.contributor.authorPinte, C.en_US
dc.contributor.authorGonzalez, J.-F.en_US
dc.contributor.authorPlas, G. van deren_US
dc.contributor.authorWeaver, E.en_US
dc.contributor.authorTeague, R.en_US
dc.contributor.authorGarg, H.en_US
dc.contributor.authorMéheut, H.en_US
dc.date.accessioned2021-06-25T13:34:59Zen_US
dc.date.available2021-06-25T13:34:59Zen_US
dc.date.issued2021en_US
dc.description.abstractVortices are one of the most promising mechanisms to locally concentrate millimeter dust grains and allow the formation of planetesimals through gravitational collapse. The outer disk around the binary system HD 142527 is known for its large horseshoe structure with azimuthal contrasts of ~3–5 in the gas surface density and of ~50 in the dust. Using 13CO and C18O J = 3–2 transition lines, we detect kinematic deviations to the Keplerian rotation, which are consistent with the presence of a large vortex around the dust crescent, as well as a few spirals in the outer regions of the disk. Comparisons with a vortex model suggest velocity deviations up to 350 m s−1 after deprojection compared to the background Keplerian rotation, as well as an extension of ±40 au radially and ~200° azimuthally, yielding an azimuthal-to-radial aspect ratio of ~5. Another alternative for explaining the vortex-like signal implies artificial velocity deviations generated by beam smearing in association with variations of the gas velocity due to gas pressure gradients at the inner and outer edges of the circumbinary disk. The two scenarios are currently difficult to differentiate and, for this purpose, would probably require the use of multiple lines at a higher spatial resolution. The beam smearing effect, due to the finite spatial resolution of the observations and gradients in the line emission, should be common in observations of protoplanetary disks and may lead to misinterpretations of the gas velocity, in particular around ring-like structures.en_US
dc.identifier.citationBoehler, Y., Ménard, F., Robert, C. M. T., et al.. "Vortex-like kinematic signal, spirals, and beam smearing effect in the HD 142527 disk." <i>Astronomy & Astrophysics,</i> 650, (2021) EDP Sciences: https://doi.org/10.1051/0004-6361/202040089.en_US
dc.identifier.digitalaa40089-20en_US
dc.identifier.doihttps://doi.org/10.1051/0004-6361/202040089en_US
dc.identifier.urihttps://hdl.handle.net/1911/110837en_US
dc.language.isoengen_US
dc.publisherEDP Sciencesen_US
dc.rightsOpen Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.en_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en_US
dc.titleVortex-like kinematic signal, spirals, and beam smearing effect in the HD 142527 disken_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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