Steady state evolution of debris disks around a stars

M. C. Wyatt, R. Smith, K. Y L Su, George H. Rieke, J. S. Greaves, C. A. Beichman, G. Bryden

Research output: Contribution to journalArticle

153 Citations (Scopus)

Abstract

This paper confronts a simple analytical model for the steady state evolution of debris disks due to collisions with Spitzer observations of dust around main-sequence A stars. It is assumed that every star has a planetesimal belt, the initial mass and radius of which are drawn from distributions. In the model disk mass is constant until the largest plan-etesimals reach collisional equilibrium, whereupon mass falls ∝tage-1. We find that the detection statistics and trends seen at 24 and 70 μm can be fitted well by the model. While there is no need to invoke stochastic evolution or delayed stirring to explain the statistics, a moderate rate of stochastic events is not ruled out. Potentially anomalous systems are identified by a high dust luminosity compared with the maximum permissible in the model (HD 3003, HD 38678, HD 115892, HD 172555); their planetesimals may have unusual properties (high strength or low eccentricity), or this dust could be transient. The overall success of our model, which assumes planetesimals in all belts have the same strength, eccentricity, and maximum size, suggests the outcome of planet formation is reasonably uniform. The distribution of planetesimal belt radii, once corrected for detection bias, follows N(r) ∝ r -0.8±0.3 for 3-120 AU. Since belt boundaries may be attributed to unseen planets, this provides a unique constraint on A star planetary systems. It is also shown that P-R drag may sculpt the inner edges of A star disks close to the Spitzer detection threshold (HD 2262, HD 19356, HD 106591, HD 115892). This model can be readily applied to the interpretation of future surveys, and predictions for the upcoming SCUBA-2 survey include that 17% of A star disks should be detectable at 850 μm.

Original languageEnglish (US)
Pages (from-to)365-382
Number of pages18
JournalAstrophysical Journal
Volume663
Issue number1 I
DOIs
StatePublished - Jul 1 2007

Fingerprint

debris
A stars
protoplanets
planetesimal
stars
dust
eccentricity
planets
planet
statistics
radii
planetary systems
main sequence stars
stirring
high strength
drag
collision
luminosity
trends
collisions

Keywords

  • Circumstellar matter
  • Planetary systems: formation

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Wyatt, M. C., Smith, R., Su, K. Y. L., Rieke, G. H., Greaves, J. S., Beichman, C. A., & Bryden, G. (2007). Steady state evolution of debris disks around a stars. Astrophysical Journal, 663(1 I), 365-382. https://doi.org/10.1086/518404

Steady state evolution of debris disks around a stars. / Wyatt, M. C.; Smith, R.; Su, K. Y L; Rieke, George H.; Greaves, J. S.; Beichman, C. A.; Bryden, G.

In: Astrophysical Journal, Vol. 663, No. 1 I, 01.07.2007, p. 365-382.

Research output: Contribution to journalArticle

Wyatt, MC, Smith, R, Su, KYL, Rieke, GH, Greaves, JS, Beichman, CA & Bryden, G 2007, 'Steady state evolution of debris disks around a stars', Astrophysical Journal, vol. 663, no. 1 I, pp. 365-382. https://doi.org/10.1086/518404
Wyatt MC, Smith R, Su KYL, Rieke GH, Greaves JS, Beichman CA et al. Steady state evolution of debris disks around a stars. Astrophysical Journal. 2007 Jul 1;663(1 I):365-382. https://doi.org/10.1086/518404
Wyatt, M. C. ; Smith, R. ; Su, K. Y L ; Rieke, George H. ; Greaves, J. S. ; Beichman, C. A. ; Bryden, G. / Steady state evolution of debris disks around a stars. In: Astrophysical Journal. 2007 ; Vol. 663, No. 1 I. pp. 365-382.
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