Unusual carbonaceous dust distribution in PN G095.2+00.7

Ohsawa, Ryou, Onaka, Takashi, Sakon, Itsuki, Mori, Tamami I., Miyata, Takashi, Asano, Kentaro, Matsuura, Mikako ORCID: https://orcid.org/0000-0002-5529-5593 and Kaneda, Hidehiro 2012. Unusual carbonaceous dust distribution in PN G095.2+00.7. The Astrophysical Journal Letters 760 (2) , L34. 10.1088/2041-8205/760/2/l34

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Abstract

We investigate the polycyclic aromatic hydrocarbon (PAH) features in the young Galactic planetary nebula PN G095.2+00.7 based on mid-infrared observations. The near- to mid-infrared spectra obtained with the AKARI/IRC and the Spitzer/IRS show the PAH features as well as the broad emission feature at 12 μm usually seen in proto-planetary nebulae (pPNe). The spatially resolved spectra obtained with Subaru/COMICS suggest that the broad emission around 12 μm is distributed in a shell-like structure, but the unidentified infrared band at 11.3 μm is selectively enhanced at the southern part of the nebula. The variation can be explained by a difference in the amount of the UV radiation to excite PAHs, and does not necessarily require the chemical processing of dust grains and PAHs. It suggests that the UV self-extinction is important to understand the mid-infrared spectral features. We propose a mechanism which accounts for the evolutionary sequence of the mid-infrared dust features seen in a transition from pPNe to PNe.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Publisher:	American Astronomical Society
ISSN:	2041-8205
Date of Acceptance:	29 October 2012
Last Modified:	15 May 2024 09:15
URI:	https://orca.cardiff.ac.uk/id/eprint/168114

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