Direct Imaging and Spectral Characterisation of Long Period Exoplanets and Brown Dwarfs

Diplôme Thèse Direct Imaging and Spectral Characterisation of Long Period Exoplanets and Brown Dwarfs eng 2020-06-17 author Rickman Emily Louise 861391 director Segransan Damien 134301 10.13097/archive-ouverte/unige:141226 urn:nbn:ch:unige-1412269 Sc. 5483 Very little is known about giant planets and brown dwarfs at an orbital separation greater than 5~AU. And yet, these are important puzzle pieces needed for constraining the uncertainties that exist in giant planet formation and evolutionary models. The complex molecular chemistry of their atmospheres leaves a relatively wide parameter space for models to span. Placing accurate mass and luminosity data to observationally populate the mass-luminosity relationship provides a major contribution to an understanding of brown dwarf and giant planet evolutionary models. This thesis describes progress towards the detection, characterisation and monitoring of widely-separated giant planets and brown dwarfs through both direct imaging and long-period radial-velocities. This includes the detection of several long-period radial-velocity giant planets and brown dwarfs, as well as the direct imaging of some of these companions with VLT/SPHERE and the discovery of a benchmark $sim$50 $M_{mathrm{Jup}}$ T-type brown dwarf. Exoplanets Brown dwarfs Direct imaging Radial velocities Atmospheric characterisation Dewey 520 26 Département d'astronomie 12 false 45ab44a3-cf3a-4f49-92a4-a5c0b579dece Thesis Public FINAL_rickman_manuscript_online.pdf 31162288 application/pdf Restricted 2021-03-09 bec2352555e26ea7fb02360e246e9307d3c8d6dc7aca48d0f3f5641ec03ae00e openAccess Faculté des sciences / Département d'astronomie

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Direct Imaging and Spectral Characterisation of Long Period Exoplanets and Brown Dwarfs				2020	669	1,011

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Rickman, Emily Louise