Spectral Analysis of Mid-IR Excesses of White Dwarfs

Details Spectral Analysis of Mid-IR Excesses of White Dwarfs Spectral Analysis of Mid-IR Excesses of White Dwarfs

2011-02-02

arxiv.org/abs/1102.0504v1

AIP Conference Proceedings, Volume 1331, pp. 215-221 (2011)

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

Part of PlanetsbeyondMS/2010 proceedings http://arxiv.org/html/1011.6606

Scientific paper

10.1063/1.3570976

In our Spitzer 24 \mu m 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. In this paper we present the analysis of these spectroscopic observations and discuss the nature of these IR excesses.

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