The International Deep Planet Survey - I. The frequency of wide-orbit massive planets around A-stars

摘要: Breakthrough direct detections of planetary companions orbiting A-type stars confirm the existence massive planets at relatively large separations, but dedicated surveys are required to estimate frequency similar systems. To measure first estimation giant exoplanetary systems orbital separation around A-stars, we have conducted a deep-imaging survey young (8−400 Myr), nearby (19−84 pc) A- and F-stars search for substellar in ∼10−300 AU range. The sample 42 combines all A-stars observed previous AO planet reported literature with new observations from VLT/NaCo Gemini/NIRI. It represents an initial subset International Deep Planet Survey (IDPS) covering M- B-stars. data were obtained diffraction-limited H -a ndKs-band combined angular differential imaging suppress speckle noise central stars, resulting typical 5σ detection limits magnitude difference 12 mag 1 �� , 14 2 16 5 which is sufficient detect planets. A detailed statistical analysis results performed using Monte Carlo simulations. Considering detections, fraction having least one (3−14 MJup) range 5−320 be inside 5.9−18.8% 68% confidence, assuming flat distribution mass By comparison, brown dwarf (15−75 2.0−8.9% confidence AU. Assuming power law distributions semimajor axis population, consistent declining number increasing radius distinct rising slope inferred radial velocity (RV) evolved suggests that peak population may occur separations between ranges probed by existing RV observations. Finally, report discovery three close M-star HIP 104365 42334.