Mon. Not. R. Astron. Soc., 453, 2533-2539 (2015/November-1)
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. and MEYER M.R.
Abstract (from CDS):
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 percent confidence.
© 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)
instrumentation: adaptive optics - instrumentation: high angular resolution - methods: statistical - techniques: image processing - stars: early-type
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