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On the Atmospheres of the Smallest Gas Exoplanets
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| 자료유형 | 학위논문 |
|---|---|
| 서명/저자사항 | On the Atmospheres of the Smallest Gas Exoplanets. |
| 개인저자 | May, Erin M. |
| 단체저자명 | University of Michigan. Astronomy and Astrophysics. |
| 발행사항 | [S.l.]: University of Michigan., 2019. |
| 발행사항 | Ann Arbor: ProQuest Dissertations & Theses, 2019. |
| 형태사항 | 173 p. |
| 기본자료 저록 | Dissertations Abstracts International 81-06B. Dissertation Abstract International |
| ISBN | 9781687999894 |
| 학위논문주기 | Thesis (Ph.D.)--University of Michigan, 2019. |
| 일반주기 |
Source: Dissertations Abstracts International, Volume: 81-06, Section: B.
Advisor: Rauscher, Emily. |
| 이용제한사항 | This item must not be sold to any third party vendors.This item must not be added to any third party search indexes. |
| 요약 | With nearly 4000 unique exoplanets detected to-date, the field of exoplanet characterization has numerous questions to answer about these diverse planets and plenty of targets to observe as we work to understand the population of exoplanets as a whole, and where Earth fits in. In particular, planets larger than Earth but smaller than Neptune (3.88 Rearth, Where Rearth refers to the radius of Earth) are the most common exoplanet detected, yet we lack a direct comparison in our Solar System to study and extrapolate from. Because there must be some point at which exoplanets transition from having a higher likelihood of being terrestrial (thin gaseous envelope compared to the total radius) to having a higher likelihood of being gaseous (large gaseous envelope compared to the total radius), this size-regime has been dubbed the `transition regime'. With this in mind, in this dissertation, I outline the most prominent current detection methods and how the information we gain from them, specifically mass and radius, informs our understanding of detected exoplanets both within and outside the transition regime. I further discuss how these parameters alone are not enough to classify planets as terrestrial or gaseous within the transition regime due to degeneracies in inferred composition from mass-radius relations. In this dissertation I take a two-pronged approach to work towards a better understanding of the classification of these transition planets through both direct observations and theory. First, in Chapters II and III I present my work to directly measure the compositions of the smallest observable gas planets using ground-based transmission spectroscopy. This technique, while not immediately probing the transition regime, is a step towards small-planet characterization as instrumentation and observational techniques improve. In Chapter IV I use a three-dimensional general circulation model to study the influence of solid surfaces on atmospheric circulation for transition regime planets and study how the surface imprints itself on the emitted and reflected light from the exoplanet with an eye toward observing these differences. In Chapter V, I further explore the atmospheres of small, Neptune-sized planets in circumbinary orbits with time varying incident flux patterns due to their orbits around their pair of host stars to explore how this environment impacts the circulation. Together, these approaches are unique, yet complementary, in their contribution towards understanding the population of exoplanets as a whole. |
| 일반주제명 | Astrophysics. Astronomy. Planetology. |
| 언어 | 영어 |
| 바로가기 | 
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