Spectral analysis of mid-IR excesses of white dwarfs

Jana Bilíková, You Hua Chu, Kate Su, Robert A. Gruendl, Thomas Rauch

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

2 Scopus citations


In our Spitzer 24 μm survey of hot white dwarfs (WDs) and archival Spitzer study of pre-WDs, i.e., central stars of planetary nebulae (CSPNs), we found mid-IR excesses for ∼15 WDs/pre-WDs. These mid-IR excesses are indicative of the presence of circumstellar dust that could be produced by sub-planetary objects. To further assess the nature of these IR-excesses, we have obtained Spitzer IRS, Gemini NIRI and Michelle, and KPNO 4 m echelle spectra of these objects. In this paper we present the analysis of these spectroscopic observations and discuss the nature of these IR excesses.

Original languageEnglish (US)
Title of host publicationPlanetary Systems Beyond the Main Sequence - Proceedings of the International Conference "Planetary Systems Beyond the Main Sequence"
Number of pages7
StatePublished - 2011
EventInternational Conference "Planetary Systems Beyond the Main Sequence" - Bamberg, Germany
Duration: Aug 11 2010Aug 14 2010

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


ConferenceInternational Conference "Planetary Systems Beyond the Main Sequence"


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

ASJC Scopus subject areas

  • General Physics and Astronomy


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