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24 April 2024 |
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On the Diversity of the Taurus Transitional Disks: UX Tau A & Lk Ca 15 | | C. Espaillat
; N. Calvet
; P. D'Alessio
; J. Hernandez
; C. Qi
; L. Hartmann
; E. Furlan
; D. M. Watson
; | | Date: |
15 Oct 2007 | | Abstract: | The recently recognized class of "transitional disk" systems consists of
young starswith optically-thick outer disks but inner disks which are mostly
devoid of small dust. Here we introduce a further class of "pre-transitional
disks" with significant near-infrared excesses which indicate the presence of
an optically thick inner disk separated from an optically thick outer disk;
thus, the spectral energy distributions of pre-transitional disks suggest the
incipient development of disk gaps rather than inner holes. In UX Tau A, our
analysis of the Spitzer IRS spectrum finds that the near-infrared excess is
produced by an inner optically thick disk and a gap of ~56 AU is present. The
Spitzer IRS spectrum of LkCa 15 is suggestive of a gap of ~46 AU, confirming
previous millimeter imaging. In addition, UX Tau A contains crystalline
silicates in its disk at radii >~ 56 AU which poses a challenge to our
understanding of the production of this crystalline material. In contrast, LkCa
15’s silicates are amorphous and pristine. UX Tau A and LkCa 15 increase our
knowledge of the diversity of dust clearing in low-mass star formation. | | Source: | arXiv, 0710.2892 | | Services: | Forum | Review | PDF | Favorites | |
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