UNIGE document Doctoral Thesis
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Know thy star, know thy planet – disentangling planet discovery & stellar activity

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Defense Thèse de doctorat : Univ. Genève, 2019 - Sc. 5377 - 2019/06/26
Abstract Kepler and K2 have enabled studies of exoplanets and stars. This thesis focuses on two goals: characterising starspots on Kepler stars and finding and following up K2 exoplanets. Starspot evolution produces quasi-sinusoidal light curves. Fitting ACFs with periodic functions, I found a correlation between starspot size, decay lifetime and stellar effective temperature. This method is used as part of RV follow-up for planet-hosting stars. K2 light curves were analysed using a new pipeline. This generated two confirmed planets: K2-140b, a Jupiter-like planet orbiting in 6.57 days (the 9th hot Jupiter from K2) and K2-311b, a single-transit-event lasting 54 hours. With RV follow-up and tools, this Jupiter-sized planet orbits in ~10 years. This is currently the longest-period transiting planet discovered. This thesis contributes to future exoplanet endeavours to discover smaller planets in distant orbits, by providing techniques for exoplanet follow-up and improving our knowledge and understanding of stellar activity.
Keywords AstrophysicsAstronomyExoplanetsPlanetsExtrasolar PlanetsTransitsStarsStarspotsStarspot DecayKeplerK2PhotometryLight Curves
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URN: urn:nbn:ch:unige-1238506
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Thesis (23.4 MB) - public document Free access
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Project FNS: NCCR PlanetS
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GILES, Helen. Know thy star, know thy planet – disentangling planet discovery & stellar activity. Université de Genève. Thèse, 2019. doi: 10.13097/archive-ouverte/unige:123850 https://archive-ouverte.unige.ch/unige:123850

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Deposited on : 2019-10-02

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