NDLI: Structuring the HD 141569 A circumstellar dust disk — Impact of eccentric bound stellar companions

Content Provider	EDP Sciences
Author	J. C. Augereau J. C. B. Papaloizou
Abstract	Scattered light images of the optically thin dust disk around the 5 Myr old star HD 141569 A have revealed its complex asymmetric structure. We show in this paper that the surface density inferred from the observations presents similarities with that expected from a circumprimary disk within a highly eccentric binary system. We assume that either the two M stars in the close vicinity of HD 141569 A are bound companions or at least one of them is an isolated binary companion. We discuss the resulting interaction with an initially axisymmetric disk. This scenario accounts for the formation of a spiral structure, a wide gap in the disk and a broad faint extension outside the truncation radius of the disk after 10–15 orbital periods with no need for massive companion(s) in the midst of the disk resolved in scattered light. The simulations match the observations and the star age if the perturber is on an elliptic orbit with a periastron distance of 930 AU and an eccentricity from 0.7 to 0.9. We find that the numerical results can be reasonably well reproduced using an analytical approach proposed to explain the formation of a spiral structure by secular perturbation of a circumprimary disk by an external bound companion. We also interpret the redness of the disk in the visible reported by [CITE] and show that short-lived grains one order of magnitude smaller than the blow-out size limit are abundant in the disk. The most probable reason for this is that the disk sustains high collisional activity. Finally we conclude that additional processes are required to clear out the disk inside 150 AU and that interactions with planetary companions possibly coupled with the remnant gas disk are likely candidates.
Ending Page	1164
Starting Page	1153
Page Count	12
File Format	HTM / HTML PDF
ISSN	00046361
Alternate Webpage(s)	https://www.aanda.org/articles/aa/abs/2004/06/aa4007/aa4007.html
e-ISSN	14320746
Issue Number	3
Journal	Astronomy & Astrophysics
Volume Number	414
DOI	10.1051/0004-6361:20031622
Language	English
Publisher	EDP Sciences
Publisher Date	2004-02-01
Access Restriction	Open
Rights Holder	© ESO, 2004
Subject Keyword	stars: planetary systems stars: HD 141569 stars: planetary systems: formation stars: planetary systems / stars: HD 141569 / stars: planetary systems: formation
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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