[en] 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 (2-1) and 12CO (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 (2-1) peak-intensity map, but faint in 12CO (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.
Research Center/Unit :
Millenium ALMA Disks (MAD)
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Christiaens, Valentin ; Universidad de Chile > Departamento de Astronomía > Form. doct. sc. (sc. spatiales)
Casassus, Simon; Universidad de Chile > Departamento de Astronomia > Full Professor
Perez, Sebastian; Universidad de Chile > Departamento de Astronomia > Post-doc
van der Plas, Gerrit; Universidad de Chile > Departamento de Astronomia > Post-doc
Ménard, Francois; UMI-FCA, CNRS/INSU, France (UMI 3386) and Universidad de Chile > Departamento de Astronomia > CNRS researcher
Language :
English
Title :
Spiral Arms in the Disk of HD 142527 from CO Emission Lines with ALMA
Alternative titles :
[fr] Bras Spiraux dans le Disque de HD 142527 à partir de Raies d'Emission de CO avec ALMA.
Publication date :
28 March 2014
Journal title :
Astrophysical Journal. Letters
ISSN :
2041-8205
eISSN :
2041-8213
Publisher :
IOP Publishing, Bristol, United Kingdom
Volume :
785
Pages :
12
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
Grant 1130949
Funders :
Millenium Nucleus P10-022-F (Chilean Ministry of Education) FONDECYT - Chile Fondo Nacional de Desarrollo Científico y Tecnológico
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