An Adaptive Optics Search for Companions to Stars with Planets

Abstract

We have performed a Keck adaptive optics (AO) imaging survey of 25 extrasolar planetary systems discovered by the radial velocity programs. Typically, the high-resolution (FWHM~0.04") near-infrared images are able to detect point sources at dH=10 at 1", L and T dwarfs at 0.5" to 2.0", and stars and brown dwarfs at 3-10 AU and 10-100 AU from the targets. The AO images reveal 15 faint sources (H=14-20) near the stars HD 37124, HD 168443, HD 187123, and HD 190228 out to a search radius of 3.3. We have obtained AO images at a second epoch for five of the candidate companions at Keck and Gemini Observatories. The resulting measurements of proper motions relative to the primary stars indicate that these five sources are background stars. Given that the four primaries are near the Galactic plane (|b|<6 deg), the remaining faint sources are also likely to be background stars rather than substellar companions. We present the companion detection limits for each target as a function of separation and compare them to the sensitivities of radial velocity surveys, demonstrating the complementary nature of the two techniques.

to be published in The Astrophysical Journal, 26 pages, 13 figures, also found at http://cfa-www.harvard.edu/sfgroup/preprints.html

References in corpus (9)

• HST Time-Series Photometry of the Transiting Planet of HD 209458
• Near-Infrared Spectral Classification of late-M and L Dwarfs
• First Results from the Anglo-Australian Planet Search - A Brown Dwarf Candidate and a 51 Peg-like Planet
• Substellar Companions to Main Sequence Stars: No Brown Dwarf Desert at Wide Separations
• The Abundance Distribution in the Extrasolar-Planet Host Star HD19994
• The CORALIE survey for southern extrasolar planets V: 3 new extrasolar planets
• Coronagraphic Survey for Companions of Stars within 8 pc
• Analysis of the Hipparcos Observations of the Extrasolar Planets and the Brown-Dwarf Candidates
• Screening the Hipparcos-based astrometric orbits of sub-stellar objects

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• The multiplicity of exoplanet host stars - New low-mass stellar companions of the exoplanet host stars HD125612 and HD212301
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• An HST Search for Substellar Companions in the Young Cluster IC 348
• Deep infrared imaging of close companions to austral A- and F-type stars
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• The Cornell High-order Adaptive Optics Survey for Brown Dwarfs in Stellar Systems-I: Observations, Data Reduction, and Detection Analysis
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• Chasing extreme planetary architectures: I- HD196885Ab, a super-Jupiter dancing with two stars?
• On the Nature of the Purported Common Proper Motion Companions to the Exoplanet Host Star 51 Peg
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