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Abstract: Since planets were first discovered outside our own Solar System in 1992around a pulsar and in 1995 around a main sequence star, extrasolar planetstudies have become one of the most dynamic research fields in astronomy. Nowthat more than 370 exoplanets have been discovered, focus has moved fromfinding planets to characterise these alien worlds. As well as detecting theatmospheres of these exoplanets, part of the characterisation processundoubtedly involves the search for extrasolar moons. A review on the currentsituation of exoplanet characterization is presented in Chapter 3. We focus onthe characterization of transiting planets orbiting very close to their parentstar since for them we can already probe their atmospheric constituents. Bycontrast, the second part of the Chapter is dedicated to the search forextraterrestrial life, both within and beyond the Solar System. Thecharacteristics of the Habitable Zone and the markers for the presence of lifebiosignatures are detailed. In Chapter 4 we describe the primary transitobservations of the hot Jupiter HD 209458b we obtained at 3.6, 4.5, 5.8 and 8.0micron using IRAC-Spitzer. Chapter 5 is dedicated to the search for exomoons,we review a model for the TTV and TDV signals which permits not only theidentification of exomoons but also the derivation of some of theircharacteristics. Finally, in Chapter 6 the detectability of a habitable-zoneexomoon around various configurations of exoplanetary systems with the KeplerMission or photometry of approximately equal quality is investigated. We findthat habitable-zone exomoons down to 0.2 Earth Masses may be detected.



Autor: Giammarco Campanella

Fuente: https://arxiv.org/



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