A massive, dusty toroid with large grains in the pre-planetary nebula IRAS22036+5306

Details A massive, dusty toroid with large grains in the pre-planetary nebula IRAS22036+5306 A massive, dusty toroid with large grains in the pre-planetary nebula IRAS22036+5306

Jan 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008ap%26ss.313..241s&link_type=abstract

Astrophysics and Space Science, Volume 313, Issue 1-3, pp. 241-244

Astronomy and Astrophysics

Astrophysics

4

Circumstellar Matter, Planetary Nebulae: Individual (Iras 22036+5306), Reflection Nebulae, Agb And Post-Agb Stars, Mass Loss, Winds &Amp, Outflows, Interferometry

Scientific paper

Using the Submillimeter Array (SMA), we have obtained high angular-resolution (˜1″) interferometric maps of the submillimeter (0.88 mm) continuum and CO J=3 2 line from IRAS 22036+5306 (I 22036), a bipolar pre-planetary nebula (PPN) with knotty jets discovered in our HST SNAPshot survey of young PPNe. In addition, we have obtained supporting lower-resolution (˜10″) 2.6 mm continuum and CO, 13CO J=1 0 observations with the Owens Valley Radio Observatory (OVRO) interferometer. We find an unresolved source of submillimeter (and millimeter-wave) continuum emission in I 22036, implying a very substantial mass (0.02 0.04 M &sun;) of large (i.e., radius ≳1 mm), cold (≲50 K) dust grains associated with I 22036’s toroidal waist. The CO J=3 2 observations show the presence of a very fast (˜220 km s-1), highly collimated, massive (0.03 M &sun;) bipolar outflow with a very large scalar momentum (about 1039 g cm s-1), and the characteristic spatio-kinematic structure of bow-shocks at the tips of this outflow. The fast outflow in I 22036, as in most PPNe, cannot be driven by radiation pressure. The large mass of the torus suggests that it has most likely resulted from common-envelope evolution in a binary, however it remains to be seen whether or not the time-scales required for the growth of grains to millimeter sizes in the torus are commensurate with such a formation scenario. The presence of the torus should facilitate the formation of the accretion disk needed to launch the jet. We also find that the 13C/12C ratio in I 22036 is very high (0.16), close to the maximum value achieved in equilibrium CNO-nucleosynthesis (0.33). The combination of the high circumstellar mass (i.e., in the torus and an extended dust shell inferred from ISO far-infrared spectra) and the high 13C/12C ratio in I 22036 provides strong support for this object having evolved from a massive (≳4 M &sun;) progenitor in which hot-bottom-burning has occurred.

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