2006/11/10 by K. Geißler, K. Geissler, S. Kellner +14 · 1 citation
Physics and Astronomy · #Adaptive optics #Adaptive optics and wavefront sensing #Astrometry #Astronomy #Astronomy and Astrophysical Research #Astrophysics #Galaxy #Optics #Photometry (optics) #Physics #Position angle #Stars #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.1051/0004-6361:20065843
6 pages, 5 figures, accepted by A&A
arxiv created 2006/11/10 · openalex publication_date 2006/11/13 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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 MJ 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 . The photometry for the candidate companion yields mH = (16.45 ± 0.04) mag and = (15.41 ± 0.06) mag, respectively. Those magnitudes and the resulting color () = (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.