Spectropolarimetry and radiative transfer modeling of three proto-planetary nebulae

Benjamin Darwin Oppenheimer, John H Bieging, Gary D. Schmidt, Karl D. Gordon, Karl A. Misselt, Paul S. Smith

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

We measured the spectrum of polarization for three proto-planetary nebulae (PPNs), IRAS 17411-2411, IRAS 08005-2356, and IRAS 04296+3429, and made model calculations with the dust-scattering Monte Carlo code DIRTY and the dust emission code 2Dust. We show that high levels of polarization in these PPNs correlate with extreme asymptotic giant branch (AGB) superwind mass-loss rates in excess of 10-4 M⊙ yr-1. All three objects show evidence for evacuated lobes cleared by collimated fast winds, and two indicate a significant equatorial mass enhancement. Our best-fit models require sharply peaked grain size distributions, suggesting that most of the light is being scattered by grains of a characteristic size in IRAS 17441-2411 and IRAS 08005-2356. IRAS 17441-2411 and IRAS 08005-2356 have lobes with wide opening angles, perhaps produced by deflection of a polar jet from an accreting companion by the AGB superwind. Modeling the spectropolarimetry of IRAS 04296+3429 indicates a point-symmetric, multipolar morphology in the PPN phase. The modeling of spectropolarimetry and other observations of PPNs provides a powerful way to constrain circumstellar morphology and dust parameters.

Original languageEnglish (US)
Pages (from-to)957-972
Number of pages16
JournalAstrophysical Journal
Volume624
Issue number2 I
DOIs
StatePublished - May 10 2005

Fingerprint

planetary nebulae
Infrared Astronomy Satellite
radiative transfer
dust
polarization
modeling
deflection
grain size
scattering
lobes
code
augmentation

Keywords

  • AGB
  • Dust, extinction
  • Stars: Agb and post
  • Techniques: Polarimetric

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Oppenheimer, B. D., Bieging, J. H., Schmidt, G. D., Gordon, K. D., Misselt, K. A., & Smith, P. S. (2005). Spectropolarimetry and radiative transfer modeling of three proto-planetary nebulae. Astrophysical Journal, 624(2 I), 957-972. https://doi.org/10.1086/429081

Spectropolarimetry and radiative transfer modeling of three proto-planetary nebulae. / Oppenheimer, Benjamin Darwin; Bieging, John H; Schmidt, Gary D.; Gordon, Karl D.; Misselt, Karl A.; Smith, Paul S.

In: Astrophysical Journal, Vol. 624, No. 2 I, 10.05.2005, p. 957-972.

Research output: Contribution to journalArticle

Oppenheimer, BD, Bieging, JH, Schmidt, GD, Gordon, KD, Misselt, KA & Smith, PS 2005, 'Spectropolarimetry and radiative transfer modeling of three proto-planetary nebulae', Astrophysical Journal, vol. 624, no. 2 I, pp. 957-972. https://doi.org/10.1086/429081
Oppenheimer, Benjamin Darwin ; Bieging, John H ; Schmidt, Gary D. ; Gordon, Karl D. ; Misselt, Karl A. ; Smith, Paul S. / Spectropolarimetry and radiative transfer modeling of three proto-planetary nebulae. In: Astrophysical Journal. 2005 ; Vol. 624, No. 2 I. pp. 957-972.
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