A single circumbinary disk in the HD 98800 quadruple system

David W Koerner, E. L N Jensen, K. L. Cruz, T. B. Guild, K. Gultekin

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

We present subarcsecond thermal infrared imaging of HD 98800, a young quadruple system composed of a pair of low-mass spectroscopic binaries separated by 0″.S (38 AU), each with a K-dwarf primary. Images at wavelengths ranging from 5 to 24.5 μm show unequivocally that the optically fainter binary, HD 98800B, is the sole source of a comparatively large infrared excess on which a silicate emission feature is superposed. The excess is detected only at wavelengths of 7.9 μm and longer, peaks at 25 μm, and has a best-fit blackbody temperature of 150 K, indicating that most of the dust lies at distances greater than the orbital separation of the spectroscopic binary. We estimate the radial extent of the dust with a disk model that approximates radiation from the spectroscopic binary as a single source of equivalent luminosity. Given the data, the most likely values of disk properties in the ranges considered are Rin = 5.0 ± 2.5 AU, ΔR = 13 ± 8 AU, λ0 = 2+4-1.5 μm, γ = 0 ± 2.5, and σtotal = 16 ± 3 AU2, where Rin is the inner radius, ΔR is the radial extent of the disk, λ0 is the effective grain size, γ is the radial power-law exponent of the optical depth τ, and σtotal is the total cross section of the grains. The range of implied disk masses is 0.001-0.1 times that of the Moon. These results show that, for a wide range of possible disk properties, a circumbinary disk is far more likely than a narrow ring.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume533
Issue number1 PART 2
StatePublished - Apr 10 2000
Externally publishedYes

Fingerprint

dust
wavelength
optical depth
Moon
power law
grain size
silicate
cross section
temperature
moon
wavelengths
optical thickness
silicates
luminosity
exponents
orbitals
radii
rings
cross sections
radiation

Keywords

  • Binaries: close
  • Binaries: spectroscopic
  • Circumstellar matter
  • Planetary systems
  • Stars: imaging
  • Stars: individual (HD 98800)

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Koerner, D. W., Jensen, E. L. N., Cruz, K. L., Guild, T. B., & Gultekin, K. (2000). A single circumbinary disk in the HD 98800 quadruple system. Astrophysical Journal, 533(1 PART 2).

A single circumbinary disk in the HD 98800 quadruple system. / Koerner, David W; Jensen, E. L N; Cruz, K. L.; Guild, T. B.; Gultekin, K.

In: Astrophysical Journal, Vol. 533, No. 1 PART 2, 10.04.2000.

Research output: Contribution to journalArticle

Koerner, DW, Jensen, ELN, Cruz, KL, Guild, TB & Gultekin, K 2000, 'A single circumbinary disk in the HD 98800 quadruple system', Astrophysical Journal, vol. 533, no. 1 PART 2.
Koerner DW, Jensen ELN, Cruz KL, Guild TB, Gultekin K. A single circumbinary disk in the HD 98800 quadruple system. Astrophysical Journal. 2000 Apr 10;533(1 PART 2).
Koerner, David W ; Jensen, E. L N ; Cruz, K. L. ; Guild, T. B. ; Gultekin, K. / A single circumbinary disk in the HD 98800 quadruple system. In: Astrophysical Journal. 2000 ; Vol. 533, No. 1 PART 2.
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