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Spiral Arms in the Disk of HD 142527 from CO Emission Lines with ALMA

Universidad de Chile. Repositorio Académico

Título Spiral Arms in the Disk of HD 142527 from CO Emission Lines with ALMA
Autor Pérez, Sebastián
Ménard, François
van der Plas, Gerrit
Christiaens, Valentin
Casassus Montero, Simon Pablo
Tema planet
Descripción Artículo de publicación ISI.
In view of both the size of its gap and the previously reported asymmetries and near-infrared spiral arms, the
transition disk of the Herbig Fe star HD 142527 constitutes a remarkable case study. This paper focuses on the
morphology of the outer disk through ALMA observations of 12CO J = 2–1, 12CO J = 3–2, and 13CO J = 2–1.
Both 12CO J = 2–1 and 12CO J = 3–2 show spiral features of different sizes. The innermost spiral arm (S1)
is a radio counterpart of the first near-infrared spiral observed by Fukagawa, but it is shifted radially outward.
However, the most conspicuous CO spiral arm (S2) lies at the outskirts of the disk and has not been detected before.
It corresponds to a cold density structure, with both brightness and excitation temperatures of order 13±2 K and
conspicuous in the 12CO J = 2–1 peak-intensity map, but faint in 12CO J = 3–2. There is also a faint counterarm
(S3), at a point-symmetric location of S2 with respect to the star. These three spirals are modeled separately with
two different formulae that approximate the loci of density maxima in acoustic waves due to embedded planets. S1
could be fit relatively well with these formulae, compared to S2 and S3. Alternative scenarios such as gravitational
instability or external tidal interaction are discussed. The impact of channelization on spectrally and spatially
resolved peak intensity maps is also briefly addressed.
Fecha 2014-09-30T19:12:09Z
Tipo Artículo de revista
Enlace The Astrophysical Journal Letters, 785:L12 (5pp), 2014 April 10
Idioma en_US