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

Content Provider	Springer Nature Link
Author	Sahai, R. Young, K. Patel, N. Sánchez Contreras, C. Morris, M.
Copyright Year	2007
Abstract	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 (0.02–0.04M ⊙) 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 (0.03M ⊙) 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 (≳4M ⊙) progenitor in which hot-bottom-burning has occurred.
Starting Page	241
Ending Page	244
Page Count	4
File Format	PDF
ISSN	0004640X
Journal	Astrophysics and Space Science
Volume Number	313
Issue Number	1-3
e-ISSN	1572946X
Language	English
Publisher	Springer Netherlands
Publisher Date	2007-10-11
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Circumstellar matter Planetary nebulae: individual (IRAS 22036+5306) Reflection nebulae AGB and post-AGB stars Mass loss Winds & outflows Interferometry Astronomy
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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