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Spitzer IRS spectroscopy of planetary nebulae

  • G. Ramos-Larios (a1), M. A. Guerrero (a2), H. Mata (a1), X. Fang (a3), A. Nigoche-Netro (a1), J. A. Toalá (a4) and G. Rubio (a1)...

Abstract

We present Spitzer Space Telescope archival mid-infrared (mid-IR) spectroscopy of a sample of eleven planetary nebulae (PNe). The observations, acquired with the Spitzer Infrared Spectrograph (IRS), cover the spectral range 5.2-14.5 μm that includes the H2 0-0 S(2) to S(7) rotational emission lines. This wavelength coverage has allowed us to derive the Boltzmann distribution and calculate the H2 rotational excitation temperature (Tex). The derived excitation temperatures have consistent values ≃ 900 ±70 K for different sources despite their different structural components. We also report the detection of mid-IR ionic lines of [Ar iii], [S iv], and [Ne ii] in most objects, and polycyclic aromatic hydrocarbon (PAH) features in a few cases.

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Mata, H., Ramos-Larios, G., Guerrero, M. A., et al. 2016, MNRAS, 459, 841
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Keywords

Spitzer IRS spectroscopy of planetary nebulae

  • G. Ramos-Larios (a1), M. A. Guerrero (a2), H. Mata (a1), X. Fang (a3), A. Nigoche-Netro (a1), J. A. Toalá (a4) and G. Rubio (a1)...

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