Spectral Analysis of Mid-IR Excesses of WDs

Details Spectral Analysis of Mid-IR Excesses of WDs Spectral Analysis of Mid-IR Excesses of WDs

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21733914b&link_type=abstract

American Astronomical Society, AAS Meeting #217, #339.14; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

In our Spitzer 24 um 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 4m echelle spectra of these objects. We present the analysis of these spectroscopic observations and discuss the nature of these IR excesses.

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