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Searching for gas giant planets on Solar system scales - a NACO/APP L′-band survey of A- and F-type main-sequence stars

Meshkat, T. ; Kenworthy, M. A. ; Reggiani, M. ; Quanz, S. P. ; Mamajek, E. E. ; Meyer, M. R.

In: Monthly Notices of the Royal Astronomical Society, 2015, vol. 453, no. 3, p. 2533-2539

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    Titre
    • Searching for gas giant planets on Solar system scales - a NACO/APP L′-band survey of A- and F-type main-sequence stars
    Auteur
    • Meshkat, T.. Leiden Observatory, PO Box 9513, Niels Bohrweg 2, NL-2300 RA Leiden, the Netherlands
    • Kenworthy, M. A.. Leiden Observatory, PO Box 9513, Niels Bohrweg 2, NL-2300 RA Leiden, the Netherlands
    • Reggiani, M.. Institute for Astronomy, ETH Zurich, Wolfgang-Pauli-Strasse 27, CH-8093 Zurich, Switzerland
    • Quanz, S. P.. Institute for Astronomy, ETH Zurich, Wolfgang-Pauli-Strasse 27, CH-8093 Zurich, Switzerland
    • Mamajek, E. E.. Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627-0171, USA
    • Meyer, M. R.. Institute for Astronomy, ETH Zurich, Wolfgang-Pauli-Strasse 27, CH-8093 Zurich, Switzerland
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Monthly Notices of the Royal Astronomical Society, 2015, vol. 453, no. 3, p. 2533-2539. Oxford University Press
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:301908
    Summary
    We report the results of a direct imaging survey of A- and F-type main-sequence stars searching for giant planets. A/F stars are often the targets of surveys, as they are thought to have more massive giant planets relative to solar-type stars. However, most imaging is only sensitive to orbital separations>30 au, where it has been demonstrated that giant planets are rare. In this survey, we take advantage of the high-contrast capabilities of the Apodizing Phase Plate coronagraph on NACO at the Very Large Telescope. Combined with optimized principal component analysis post-processing, we are sensitive to planetary-mass companions (2-12 MJup) at Solar system scales (≤30 au). We obtained data on 13 stars in the L′ band and detected one new companion as part of this survey: an M6.0±0.5 dwarf companion around HD 984. We re-detect low-mass companions around HD 12894 and HD 20385, both reported shortly after the completion of this survey. We use Monte Carlo simulations to determine new constraints on the low-mass (<80 MJup) companion frequency, as a function of mass and separation. Assuming solar-type planet mass and separation distributions, normalized to the planet frequency appropriate for A-stars, and the observed companion mass-ratio distribution for stellar companions extrapolated to planetary masses, we derive a truncation radius for the planetary mass companion surface density of<135 au at 95 per cent confidence