NACO-SDI imaging of known companion host stars from the AAPS and Keck planet search surveys
J.S. Jenkins, H.R.A. Jones, B. Biller, S.J. O'Toole, D.J. Pinfield, L., Close, C.G. Tinney, R.P. Butler, R. Wittenmyer, B. Carter, A.C. Day-Jones

TL;DR
This study combines adaptive optics imaging and radial-velocity data to search for and characterize known companions around stars, providing insights into the detectability limits of direct imaging for exoplanets and brown dwarfs.
Contribution
The paper presents a novel combined analysis of high-contrast imaging and radial-velocity data to assess the detectability of known companions and constrain their properties.
Findings
Most stars do not host cool methane objects within 2'' separation.
Contrast limits allow ruling out certain companion masses at specific separations.
Detectability confidence limits improve understanding of companion properties when combined with imaging data.
Abstract
Direct imaging of brown dwarfs as companions to solar-type stars can provide a wealth of well-constrained data to "benchmark" the physics of such objects, since quantities like metallicity and age can be determined from their well-studied primaries. We present results from an adaptive optics imaging program on stars drawn from the Anglo-Australian and Keck Planet Search projects, with the aim of directly imaging known cool companions. Simulations have modeled the expected contrast ratios and separations of known companions using estimates of orbital parameters available from current radial-velocity data and then a selection of the best case objects were followed-up with high contrast imaging to attempt to directly image these companions. These simulations suggest that only a very small number of radial-velocity detected exoplanets with consistent velocity fits and age estimates could…
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