FORMATION AND EVOLUTION OF PLANETARY SYSTEMS: PROPERTIES OF DEBRIS DUST AROUND SOLAR-TYPE STARS

By J. Carpenter, J. Bouwman, Eric Mamajek, M. Meyer, L. Hillenbrand, D. Backman, Th. Henning, D. Hines, D. Hollenbach, J. Kim and 5 more. 2008

160 citations recorded by the source corpus.

We present Spitzer photometric (IRAC and MIPS) and spectroscopic (IRS low resolution) observations for 314 stars in the Formation and Evolution of Planetary Systems Legacy program. These data are used to investigate the properties and evolution of circumstellar dust around solar-type stars spanning ages from approximately 3 Myr–3 Gyr. We identify 46 sources that exhibit excess infrared emission above the stellar photosphere at 24 μm, and 21 sources with excesses at 70 μm. Five sources with an infrared excess have characteristics of optically thick primordial disks, while the remaining sources have properties akin to debris systems. The fraction of systems exhibiting a 24 μm excess greater than 10.2% above the photosphere is 15% for ages < 300 Myr and declines to 2.7% for older ages. The upper envelope to the 70 μm fractional luminosity appears to decline over a similar age range. The characteristic temperature of the debris inferred from the IRS spectra range between 60 and 180 K, with evidence for the presence of cooler dust to account for the strength of the 70 μm excess emission. No strong correlation is found between dust temperature and stellar age. Comparison of the observational data with disk models containing a power-law distribution of silicate grains suggests that the typical inner-disk radius is ≳ 10 AU. Although the interpretation is not unique, the lack of excess emission shortward of 16 μm and the relatively flat distribution of the 24 μm excess for ages ≲ 300 Myr is consistent with steady-state collisional models.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/25c9e273d136b250ee5b2016a57f7a6dd21932da

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Citations in the corpus

COMETARY ORIGIN OF THE ZODIACAL CLOUD AND CARBONACEOUS MICROMETEORITES. IMPLICATIONS FOR HOT DEBRIS DISKS (2009, background): “For comparison, the approximate 3σ excess detection limits of Spitzer telescope observations of Sun-like stars are 0.054 at 24 μm and 0.55 at 70 μm (Carpenter et al. 2009).”
Debris disks as signposts of terrestrial planet formation (2011, methodology): “…with observed excesses at 24 and 70 μm (Habing et al. 2001; Beichman et al. 2006; Moór et al. 2006; Trilling et al. 2008; Hillenbrand et al. 2008; Carpenter et al. 2009; Gáspár et al. 2009), although our stable simulations yield very few systems with F/Fstar(70 μm) ≈ 1−10, probably because of…”
ZODIACAL EXOPLANETS IN TIME (ZEIT). III. A SHORT-PERIOD PLANET ORBITING A PRE-MAIN-SEQUENCE STAR IN THE UPPER SCORPIUS OB ASSOCIATION (2016, methodology): “K2-33, may have excess emission at 24µm (measured by the MIPS instrument on Spitzer), but shows no significant excess in any of the WISE bands or the Spitzer 8 and 16µm bands (Carpenter et al. 2009; Luhman & Mamajek 2012).”
NEW DEBRIS DISKS AROUND YOUNG, LOW-MASS STARS DISCOVERED WITH THE SPITZER SPACE TELESCOPE (2009, unknown): “Carpenter et al. (2009) and Trilling et al. (2008) both note that the 70 µm age evolution for the disk frequency and – 16 – disk brightness for solar-type stars does not decrease with age as strongly as is observed for A-type stars (Su et al. 2006; Rieke et al. 2005).”
THE TUCANA/HOROLOGIUM, COLUMBA, AB DORADUS, AND ARGUS ASSOCIATIONS: NEW MEMBERS AND DUSTY DEBRIS DISKS (2011, background): “Neither listing Young, nearby stellar associations 13 contains stars in the AB Dor Association although a few such stars appear in Spitzer papers by Plavchen et al. (2009), Carpenter et al. (2009), and Hillenbrand et al. (2008).”