The Rich Circumstellar Chemistry of SMP LMC 11

Details The Rich Circumstellar Chemistry of SMP LMC 11 The Rich Circumstellar Chemistry of SMP LMC 11

2011-11-10

arxiv.org/abs/1111.2533v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

13 pages, 4 figures, accepted for publication in ApJ

Scientific paper

Carbon-rich evolved stars from the asymptotic giant branch to the planetary nebula phase are characterized by a rich and complex carbon chemistry in their circumstellar envelopes. A peculiar object is the preplanetary nebula SMP LMC 11, whose Spitzer-IRS spectrum shows remarkable and diverse molecular absorption bands. To study how the molecular composition in this object compares to our current understanding of circumstellar carbon chemistry, we modeled this molecular absorption. We find high abundances for a number of molecules, perhaps most notably benzene. We also confirm the presence of propyne (CH3C2H) in this spectrum. Of all the cyanopolyynes, only HC3N is evident; we can detect at best a marginal presence of HCN. From comparisons to various chemical models, we can conclude that SMP LMC 11 must have an unusual circumstellar environment (a torus rather than an outflow).

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