Hokupa'a-gemini discovery of two ultracool companions to the young star HD 130948

D. Potter, E. L. Martín, M. C. Cushing, P. Baudoz, W. Brandner, Olivier Guyon, R. Neuhäuser

Research output: Contribution to journalArticle

93 Citations (Scopus)

Abstract

We report the discovery of two faint ultracool companions to the nearby (d ∼ 17.9 pc) young G2 V star HD 130948 (HR 5534, HIP 72567) using the Hokupa'a adaptive optics (AO) instrument mounted on the Gemini North 8 m telescope. Both objects have the same common proper motion as the primary star as seen over a 7 month baseline and have near-IR photometric colors that are consistent with an early L classification. Near-IR spectra taken with the NIRSPEC AO instrument on the Keck II telescope reveal K I lines, FeH, and H 2O band heads. Based on these spectra, we determine that both objects have a spectral type of dL2 with an uncertainty of two spectral subclasses. The position of the new companions on the H-R diagram in comparison with theoretical models is consistent with the young age of the primary star (<0.8 Gyr) estimated on the basis of X-ray activity, lithium abundance, and fast rotation. HD 130948B and C likely constitute a pair of young contracting brown dwarfs with an orbital period of about 10 yr and will yield dynamical masses for L dwarfs in the near future.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume567
Issue number2 II
StatePublished - Mar 10 2002
Externally publishedYes

Fingerprint

adaptive optics
stars
telescopes
hot isostatic pressing
proper motion
lithium
diagram
diagrams
color
orbitals
young
x rays
comparison

Keywords

  • Binaries: close
  • Binaries: visual
  • Stars: evolution
  • Stars: fundamental parameters
  • Stars: imaging
  • Stars: low-mass, brown dwarfs

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Potter, D., Martín, E. L., Cushing, M. C., Baudoz, P., Brandner, W., Guyon, O., & Neuhäuser, R. (2002). Hokupa'a-gemini discovery of two ultracool companions to the young star HD 130948. Astrophysical Journal, 567(2 II).

Hokupa'a-gemini discovery of two ultracool companions to the young star HD 130948. / Potter, D.; Martín, E. L.; Cushing, M. C.; Baudoz, P.; Brandner, W.; Guyon, Olivier; Neuhäuser, R.

In: Astrophysical Journal, Vol. 567, No. 2 II, 10.03.2002.

Research output: Contribution to journalArticle

Potter, D, Martín, EL, Cushing, MC, Baudoz, P, Brandner, W, Guyon, O & Neuhäuser, R 2002, 'Hokupa'a-gemini discovery of two ultracool companions to the young star HD 130948', Astrophysical Journal, vol. 567, no. 2 II.
Potter D, Martín EL, Cushing MC, Baudoz P, Brandner W, Guyon O et al. Hokupa'a-gemini discovery of two ultracool companions to the young star HD 130948. Astrophysical Journal. 2002 Mar 10;567(2 II).
Potter, D. ; Martín, E. L. ; Cushing, M. C. ; Baudoz, P. ; Brandner, W. ; Guyon, Olivier ; Neuhäuser, R. / Hokupa'a-gemini discovery of two ultracool companions to the young star HD 130948. In: Astrophysical Journal. 2002 ; Vol. 567, No. 2 II.
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