The Dust Cloud around the White Dwarf G29-38

By W. Reach, M. Kuchner, Ted von Hippel, Adam Burrows, F. Mullally, M. Kilic, D. Winget. 2005

163 citations recorded by the source corpus.

We present new observations of the white dwarf G29-38 with the camera (4.5 and 8 μm), photometer (24 μm), and spectrograph (5.5-14 μm) of the Spitzer Space Telescope. This star has an exceptionally large infrared excess, amounting to 3% of the bolometric luminosity. The spectral energy distribution (SED) has a continuum peak around 4.5 μm and a 9-11 μm emission feature 1.25 times brighter than the continuum. A mixture of amorphous olivine and a small amount of forsterite in an emitting region 1-5 R☉ from the star can reproduce the shape of the 9-11 μm feature. The SED also appears to require amorphous carbon to explain the hot continuum. Our new measurements support the idea that a relatively recent disruption of a comet or asteroid created the cloud.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/e115d8232fe1990b1d33515e3db8e213b26079ef

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Citations in the corpus

Externally Polluted White Dwarfs with Dust Disks (2007, methodology): “Accretion from this disk can explain atmospheric pollutions (Zuckerman et al. 2003) as seems likely to have occurred for GD 362 (Becklin et al. 2005, Kilic et al. 2005, Jura et al. 2007) and G29-38 (Jura 2003, Reach et al. 2005b).”
Circumstellar Debris and Pollution at White Dwarf Stars (2016, methodology): “Inspired by the work of Probst and armed with a rapidly evolving set of detectors at the NASA Infrared Telescope Facility (IRTF), Zuckerman & Becklin (1987) identified the first white dwarf with infrared excess emission that was not associated with a stellar companion; G29-38.”
On the Spectral Evolution of Cool, Helium-Atmosphere White Dwarfs: Detailed Spectroscopic and Photometric Analysis of DZ Stars (2007, unknown): “…our study can be used to identify the best candidates for future UV observations (for abundance analyses) and IR observations (to find possible debris disks or dust clouds around white dwarfs; see similar studies around DAZ stars in Reach et al. 2005; Kilic et al. 2005, 2006a; Becklin et al. 2005).”
THE LINK BETWEEN PLANETARY SYSTEMS, DUSTY WHITE DWARFS, AND METAL-POLLUTED WHITE DWARFS (2012, background): “…abundance analysis of narrow metal lines in the photosphere of the target white dwarf, or detection of gaseous emission lines (Zuckerman et al. 2003; Koester et al. 2005; Reach et al. 2005; Kilic et al. 2006; Gänsicke et al. 2006; von Hippel et al. 2007; Farihi et al. 2010; Debes et al. 2011b).”
Simulations of two-planet systems through all phases of stellar evolution: implications for the instability boundary and white dwarf pollution (2013, background): “…the infrared consistent with a close-in dust disc in more than a dozen cases (e.g. Zuckerman & Becklin 1987; Becklin et al. 2005; Kilic et al. 2005; Reach et al. 2005; Farihi, Jura & Zuckerman 2009) and gas discs in a handful of cases (Gänsicke et al. 2006, 2008; Gänsicke, Marsh & Southworth…”
ANCIENT PLANETARY SYSTEMS ARE ORBITING A LARGE FRACTION OF WHITE DWARF STARS (2010, background): “Arguments that weigh against comets and/or the interstellar medium as the source of the dust can be found in papers by Reach et al. (2005), Jura et al. (2007a & b), Jura et al. (2009a), and Farihi et al. (2009).”
INFRARED SIGNATURES OF DISRUPTED MINOR PLANETS AT WHITE DWARFS (2009, background): “The same argument applies to the other metal-rich white dwarfs with mid-infrared excess; simply stated, the compact size and olivine composition of the dust are at odds with expectations for disks formed through interstellar accretion (Jura et al. 2007a,b; Reach et al. 2005).”
POLLUTION OF SINGLE WHITE DWARFS BY ACCRETION OF MANY SMALL ASTEROIDS (2008, methodology): “(1) The near-infrared excess discovered around G29-38 (Zuckerman & Becklin 1987) was shown to be produced by dust (Graham et al. 1990) that likely resulted from an orbitally-perturbed minor planet (Debes & Sigurdsson 2002) that passed within the tidal-radius of the host star (Jura 2003).”
Debris Disks around White Dwarfs: The DAZ Connection (2006, background): “Spitzer spectroscopy of G29-38 revealed a silicate feature around this object, suggesting a cometary or asteroidal origin for the debris disk (Reach et al. 2005).”
The Chemical Composition of an Extrasolar Minor Planet (2007, background): “…dwarf photospheres, dusty orbiting disks were discovered at infrared wavelengths with ground-based telescopes (Zuckerman & Becklin 1987; Kilic et al. 2005; Becklin et al. 2005) and with the Spitzer Space Telescope (Reach et al. 2005; Jura et al. 2007a, 2007b; von Hippel et al. 2007).”