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; L. Close; M. Endl; M. Kürster

doi:10.1051/0004-6361:20065843

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, L. Close, M. Endl, M. Kürster

Astronomy

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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 K_s 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 M_J (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 m_H = (16.45 ± 0.04) mag and m_Ks = (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.

Original language	English (US)
Pages (from-to)	665-668
Number of pages	4
Journal	Astronomy and astrophysics
Volume	461
Issue number	2
DOIs	https://doi.org/10.1051/0004-6361:20065843
State	Published - Jan 2007

Keywords

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

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1051/0004-6361:20065843

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title = "A direct and differential imaging search for sub-stellar companions to ε Indi A",

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.",

keywords = "Stars: fundamental parameters, Stars: low-mass, brown dwarfs",

author = "K. Gei{\ss}ler and S. Kellner and W. Brandner and E. Masciadri and M. Hartung and T. Henning and R. Lenzen and L. Close and M. Endl and M. K{\"u}rster",

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T1 - A direct and differential imaging search for sub-stellar companions to ε Indi A

AU - Geißler, K.

AU - Kellner, S.

AU - Brandner, W.

AU - Masciadri, E.

AU - Hartung, M.

AU - Henning, T.

AU - Lenzen, R.

AU - Close, L.

AU - Endl, M.

AU - Kürster, M.

PY - 2007/1

Y1 - 2007/1

N2 - 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.

AB - 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.

KW - Stars: fundamental parameters

KW - Stars: low-mass, brown dwarfs

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JO - Astronomy and astrophysics

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

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Keywords

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