UTAPwiki/セミナー/planet lunch
担当者:Shoji, Mori
時間 :12:15-13:00
場所 :理学部1号館908室
内容 : We report the detection of spiral substructure in both the gas velocity and temperature structure of the disk around TW~Hya, suggestive of planet-disk interactions with an unseen planet. Perturbations from Keplerian rotation tracing out a spiral pattern are observed in the SE of the disk, while significant azimuthal perturbations in the gas temperature are seen in the outer disk, outside 90~au, extending the full azimuth of the disk. The deviation in velocity is either Δvϕ/vkep∼0.1 or Δvz/vkep∼0.01 depending on whether the perturbation is in the rotational or vertical direction, while radial perturbations can be ruled out. Deviations in the gas temperature are ±4 K about the azimuthally averaged profile, equivalent to deviations of ΔTgas/Tgas∼0.05. Assuming all three structures can be described by an Archimedean spiral, measurements of the pitch angles of both velocity and temperature spirals show a radially decreasing trend for all three, ranging from 9∘ at 70 au, dropping to 3∘ at 200 au. Such low pitch-angled spirals are not readily explained through the wake of an embedded planet in the location of previously reported at 94 au, but rather require a launching mechanism which results in much more tightly wound spirals. Molecular emission tracing distinct heights in the disk is required to accurately distinguish between spiral launching mechanisms.

Richard Teague, Jaehan Bae, Jane Huang, Edwin BerginSpiral Structure in the Gas Disk of TW~Hya3 Oct. 2019, arXiv:1910.01532doi

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Last-modified: 2019-10-08 (火) 13:55:42 (11d)