A direct and differential imaging search for sub-stellar companions to ε Indi A

K. Geißler, S. Kellner, W. Brandner, E. Masciadri, M. Hartung, T. Henning, R. Lenzen, Laird M Close, M. Endl, M. Kürster

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

We have carried out a direct and differential imaging search for sub-stellar companions to ε Indi A using the adaptive optics system NACO at the ESO VLT. The observations were carried out in September 2004 with NACO/SDI as well as with NACO's S27 camera in the H and Ks filters. The SDI data cover an area of ∼2.8″ around ε Indi A. No detection was achieved in the inner neighbourhood down to 53 MJ (5 σ confidence level) at a separation ≥0.4″(1.45 AU) and down to 21 M J for separations ≥ 1.3″ (4.7 AU). To cover a wider field of view, observations with the S27 camera and a coronagraphic mask were obtained. We detected a faint source at a separation of (7.3 ± 0.1)″ and a position angle of (302.9 ± 0.8)°. The photometry for the candidate companion yields mH = (16.45 ± 0.04) mag and mKs = (15.41 ± 0.06) mag, respectively. Those magnitudes and the resulting color (H - Ks) = (1.04 ± 0.07) mag fit best to a spectral type of L5 - L9.5 if it is bound. Observations done with HST/NICMOS by M. Endl have shown the source to be a background object.

Original languageEnglish (US)
Pages (from-to)665-668
Number of pages4
JournalAstronomy and Astrophysics
Volume461
Issue number2
DOIs
StatePublished - Jan 2007

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cameras
European Southern Observatory
field of view
adaptive optics
photometry
confidence
masks
filter
color
filters
detection

Keywords

  • Stars: fundamental parameters
  • Stars: low-mass, brown dwarfs

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Geißler, K., Kellner, S., Brandner, W., Masciadri, E., Hartung, M., Henning, T., ... Kürster, M. (2007). A direct and differential imaging search for sub-stellar companions to ε Indi A. Astronomy and Astrophysics, 461(2), 665-668. https://doi.org/10.1051/0004-6361:20065843

A direct and differential imaging search for sub-stellar companions to ε Indi A. / Geißler, K.; Kellner, S.; Brandner, W.; Masciadri, E.; Hartung, M.; Henning, T.; Lenzen, R.; Close, Laird M; Endl, M.; Kürster, M.

In: Astronomy and Astrophysics, Vol. 461, No. 2, 01.2007, p. 665-668.

Research output: Contribution to journalArticle

Geißler, K, Kellner, S, Brandner, W, Masciadri, E, Hartung, M, Henning, T, Lenzen, R, Close, LM, Endl, M & Kürster, M 2007, 'A direct and differential imaging search for sub-stellar companions to ε Indi A', Astronomy and Astrophysics, vol. 461, no. 2, pp. 665-668. https://doi.org/10.1051/0004-6361:20065843
Geißler K, Kellner S, Brandner W, Masciadri E, Hartung M, Henning T et al. A direct and differential imaging search for sub-stellar companions to ε Indi A. Astronomy and Astrophysics. 2007 Jan;461(2):665-668. https://doi.org/10.1051/0004-6361:20065843
Geißler, K. ; Kellner, S. ; Brandner, W. ; Masciadri, E. ; Hartung, M. ; Henning, T. ; Lenzen, R. ; Close, Laird M ; Endl, M. ; Kürster, M. / A direct and differential imaging search for sub-stellar companions to ε Indi A. In: Astronomy and Astrophysics. 2007 ; Vol. 461, No. 2. pp. 665-668.
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