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Early results from ChanPLaNS: Mystery of hard X-ray emitting CSPNe

Published online by Cambridge University Press:  30 August 2012

Rodolfo Montez Jr.
Affiliation:
Center for Imaging Science, Laboratory for Multiwavelength Astrophysics, Rochester Institute of Technology, Rochester, NYUSA14623
J. H. Kastner
Affiliation:
Center for Imaging Science, Laboratory for Multiwavelength Astrophysics, Rochester Institute of Technology, Rochester, NYUSA14623
B. Balick
Affiliation:
Center for Imaging Science, Laboratory for Multiwavelength Astrophysics, Rochester Institute of Technology, Rochester, NYUSA14623
E. Behar
Affiliation:
Center for Imaging Science, Laboratory for Multiwavelength Astrophysics, Rochester Institute of Technology, Rochester, NYUSA14623
E. Blackman
Affiliation:
Center for Imaging Science, Laboratory for Multiwavelength Astrophysics, Rochester Institute of Technology, Rochester, NYUSA14623
V. Bujarrabal
Affiliation:
Center for Imaging Science, Laboratory for Multiwavelength Astrophysics, Rochester Institute of Technology, Rochester, NYUSA14623
Y.-H. Chu
Affiliation:
Center for Imaging Science, Laboratory for Multiwavelength Astrophysics, Rochester Institute of Technology, Rochester, NYUSA14623
R. Corradi
Affiliation:
Center for Imaging Science, Laboratory for Multiwavelength Astrophysics, Rochester Institute of Technology, Rochester, NYUSA14623
O. De Marco
Affiliation:
Center for Imaging Science, Laboratory for Multiwavelength Astrophysics, Rochester Institute of Technology, Rochester, NYUSA14623
A. Frank
Affiliation:
Center for Imaging Science, Laboratory for Multiwavelength Astrophysics, Rochester Institute of Technology, Rochester, NYUSA14623
D. Frew
Affiliation:
Center for Imaging Science, Laboratory for Multiwavelength Astrophysics, Rochester Institute of Technology, Rochester, NYUSA14623
M. Guerrero
Affiliation:
Center for Imaging Science, Laboratory for Multiwavelength Astrophysics, Rochester Institute of Technology, Rochester, NYUSA14623
S. Kwok
Affiliation:
Center for Imaging Science, Laboratory for Multiwavelength Astrophysics, Rochester Institute of Technology, Rochester, NYUSA14623
J. A. Lopez
Affiliation:
Center for Imaging Science, Laboratory for Multiwavelength Astrophysics, Rochester Institute of Technology, Rochester, NYUSA14623
B. Miszalski
Affiliation:
Center for Imaging Science, Laboratory for Multiwavelength Astrophysics, Rochester Institute of Technology, Rochester, NYUSA14623
J. Nordhaus
Affiliation:
Center for Imaging Science, Laboratory for Multiwavelength Astrophysics, Rochester Institute of Technology, Rochester, NYUSA14623
Q. Parker
Affiliation:
Center for Imaging Science, Laboratory for Multiwavelength Astrophysics, Rochester Institute of Technology, Rochester, NYUSA14623
R. Sahai
Affiliation:
Center for Imaging Science, Laboratory for Multiwavelength Astrophysics, Rochester Institute of Technology, Rochester, NYUSA14623
C. Sandin
Affiliation:
Center for Imaging Science, Laboratory for Multiwavelength Astrophysics, Rochester Institute of Technology, Rochester, NYUSA14623
D. Schoenberner
Affiliation:
Center for Imaging Science, Laboratory for Multiwavelength Astrophysics, Rochester Institute of Technology, Rochester, NYUSA14623
N. Soker
Affiliation:
Center for Imaging Science, Laboratory for Multiwavelength Astrophysics, Rochester Institute of Technology, Rochester, NYUSA14623
J. Sokoloski
Affiliation:
Center for Imaging Science, Laboratory for Multiwavelength Astrophysics, Rochester Institute of Technology, Rochester, NYUSA14623
W. Steffen
Affiliation:
Center for Imaging Science, Laboratory for Multiwavelength Astrophysics, Rochester Institute of Technology, Rochester, NYUSA14623
T. Ueta
Affiliation:
Center for Imaging Science, Laboratory for Multiwavelength Astrophysics, Rochester Institute of Technology, Rochester, NYUSA14623
E. Villaver
Affiliation:
Center for Imaging Science, Laboratory for Multiwavelength Astrophysics, Rochester Institute of Technology, Rochester, NYUSA14623
A. Zijlstra
Affiliation:
Center for Imaging Science, Laboratory for Multiwavelength Astrophysics, Rochester Institute of Technology, Rochester, NYUSA14623
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Abstract

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We are presently using the Chandra X-ray Observatory to conduct the first systematic X-ray survey of planetary nebulae (PNe) in the solar neighborhood. The Chandra Planetary Nebula Survey (ChanPlaNS) is a 570 ks Chandra Cycle 12 Large Program targeting 21 high-excitation PNe within ~1.5 kpc of Earth. When complete, this survey will provide a suite of new X-ray diagnostics that will inform the study of late stellar evolution, binary star astrophysics, and wind interactions. Among the early results of ChanPlaNS (when combined with archival Chandra data) is a surprisingly high detection rate of relatively hard X-ray emission from CSPNe. Specifically, X-ray point sources are clearly detected in roughly half of the ~30 high-excitation PNe observed thus far by Chandra, and all but one of these X-ray-emitting CSPNe display evidence for a hard (few MK) component in their Chandra spectra. Only the central star of the Dumbbell appears to display “pure” hot blackbody emission from a ~200 kK hot white dwarf photosphere in the X-ray band. Potential explanations for the“excess” hard X-ray emission detected from the other CSPNe include late-type companions (heretofore undetected, in most cases) whose coronae have been rejuvenated by recent interactions with the mass-losing WD progenitor, non-LTE effects in hot white dwarf photospheres, self-shocking variable winds from the central star, and slow (re-)accretion of previously ejected red giant envelope mass.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2012

References

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