Spectral analysis of mid-IR excesses of central stars of planetary nebulae

Jana Bilikova, You Hua Chu, Kate Y.L. Su, Robert Gruendl

Research output: Chapter in Book/Report/Conference proceedingConference contribution


In our Spitzer 24 μm survey of hot white dwarfs (WDs) we found 9 WDs with IR excesses, 7 of them are still central stars of planetary nebulae (CSPNs). We have thus carried out a Spitzer archival survey of CSPNs, and found additional objects with IR excesses. To date, a total of 13 CSPNs show IR excesses from Spitzer observations. These mid-IR excesses are indicative of the presence of circumstellar dust, which could be produced by collisions or disruption of sub-planetary objects. To further assess the nature of these IR excesses, we have obtained Spitzer IRS, Gemini NIRI and Michelle, and KPNO 4m echelle spectra of these objects. In this poster, we summarize the spectroscopic observations and discuss the nature of these IR excesses.

Original languageEnglish (US)
Title of host publicationPlanetary Nebulae
Subtitle of host publicationAn Eye to the Future
EditorsArturo Manchado, Letizia Stanghellini, Detlef Schonberner
Number of pages2
StatePublished - Jul 2011

Publication series

NameProceedings of the International Astronomical Union
ISSN (Print)1743-9213
ISSN (Electronic)1743-9221


  • circumstellar matter
  • infrared: stars
  • planetary nebulae: general

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Astronomy and Astrophysics
  • Nutrition and Dietetics
  • Public Health, Environmental and Occupational Health
  • Space and Planetary Science


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