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Locating the Dust in A Star Debris Discs

  • Mark Booth (a1) (a2), Grant Kennedy (a3), Bruce Sibthorpe (a4), Brenda C. Matthews (a1) (a2), Mark C. Wyatt (a3), Gaspard Duchêne (a5) (a6), J. J. Kavelaars (a1) (a2), David Rodriguez (a7), Jane S. Greaves (a8), Alice Koning (a1) (a2), Laura Vican (a9), George H. Rieke (a10), Kate Y. L. Su (a10), Amaya Moro-Martín (a11) and Paul Kalas (a5) (a12)...

Abstract

Using photometry at just two wavelengths it is possible to fit a blackbody to the spectrum of infrared excess that is the signature of a debris disc. From this the location of the dust can be inferred. However, it is well known that dust in debris discs is not a perfect blackbody. By resolving debris discs we can find the actual location of the dust and compare this to that inferred from the blackbody fit. Using the Herschel Space Observatory we resolved many systems as part of the DEBRIS survey. Here we discuss a sample of 9 discs surrounding A stars and find that the discs are actually located between 1 and 2.5 times further from their star than predicted by blackbody fits to the spectral energy distribution (SED). The variation in this ratio is due to differences in stellar luminosities, location of the dust, size distribution and composition of the dust.

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References

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Booth, M., Kennedy, G., Sibthorpe, B., et al. 2013, MNRAS, 428, 1263
Dohnanyi, J. S. 1969, J. Geophys. Res., 74, 2531
Li, A. & Greenberg, J. M. 1997, A&A, 323, 566
Matthews, B. C., Sibthorpe, B., Kennedy, G., et al. 2010, A&A, 518, L135
Phillips, N. M., Greaves, J. S., Dent, W. R. F., et al. 2010, MNRAS, 403, 1089
Wyatt, M. C. 2008, ARA&A, 46, 339
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Keywords

Locating the Dust in A Star Debris Discs

  • Mark Booth (a1) (a2), Grant Kennedy (a3), Bruce Sibthorpe (a4), Brenda C. Matthews (a1) (a2), Mark C. Wyatt (a3), Gaspard Duchêne (a5) (a6), J. J. Kavelaars (a1) (a2), David Rodriguez (a7), Jane S. Greaves (a8), Alice Koning (a1) (a2), Laura Vican (a9), George H. Rieke (a10), Kate Y. L. Su (a10), Amaya Moro-Martín (a11) and Paul Kalas (a5) (a12)...

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