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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 358746.0, MPI für Astronomie / Publikationen_mpia
A direct and differential imaging search for sub-stellar companions to e Indi A
Authors:Geißler, K.; Kellner, S.; Brandner, W.; Masciadri, E.; Hartung, M.; Henning, T.; Lenzen, R.; Close, L.; Endl, M.; Kürster, M.
Date of Publication (YYYY-MM-DD):2007
Title of Journal:Astronomy and Astrophysics
Start Page:665
End Page:668
Audience:Not Specified
Abstract / Description:We have carried out a direct and differential imaging search for sub-stellar companions to <ASTROBJ>ɛ Indi A</ASTROBJ> 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 ɛ Indi A. No detection was achieved in the inner neighbourhood down to 53 MJ (5 sigma confidence level) at a separation &geq;0.4´´(1.45 AU) and down to 21 MJ for separations &geq;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 mK_s = (15.41 ± 0.06) mag, respectively. Those magnitudes and the resulting color (H-K_s) = (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.
Free Keywords:stars: low-mass; brown dwarfs; stars: fundamental parameters
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie

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