자료유형  

 학위논문

Control Number  

0016935414

International Standard Book Number  

9798380724739

Dewey Decimal Classification Number  

530

Main Entry-Personal Name  

Safsten, Emily.

Publication, Distribution, etc. (Imprint  

[S.l.] : The Pennsylvania State University., 2023

Publication, Distribution, etc. (Imprint  

Ann Arbor : ProQuest Dissertations & Theses, 2023

Physical Description  

1 online resource(163 p.)

General Note  

Source: Dissertations Abstracts International, Volume: 85-05, Section: B.

General Note  

Advisor: Dawson, Rebekah.

Dissertation Note  

Thesis (Ph.D.)--The Pennsylvania State University, 2023.

Restrictions on Access Note  

This item must not be sold to any third party vendors.

Summary, Etc.  

요약The thousands of exoplanets discovered to date have revealed a variety of worlds and orbital architectures. Observed correlations of planetary properties with other stellar or planetary parameters can offer clues about planets' origins and evolution. However, it can be difficult to distinguish the true underlying cause of an observed trend because stellar parameters are often interrelated. In particular, it is often unknown whether a planetary property is due to the age of the system - meaning it evolves over time - or other parameters that may be related to the age - meaning it is determined by formation conditions. Additionally, small sample sizes and large measurement uncertainties can cast doubt on whether a supposed trend actually exists.To address this problem, we develop a Bayesian statistical framework that uses odds ratios to compare hypotheses for the source of an observed trend of a planetary property. We define three types of hypotheses: Nurture, in which the property is due to the system age; Nature, in which the property is due to some other observed system parameter; and Chance, in which the property is unrelated to any observed parameters. We apply this framework to the proposed age trends of 2:1 orbital resonances, stellar obliquities of hot Jupiter hosts, and eccentricities of hot Jupiters. We find that stellar obliquities of stars with hot Jupiters are most likely driven by stellar temperature, not age. We find that the data very strongly support a trend of hot Jupiter orbital eccentricities due to stellar age over a trend due to semimajor axis. We do not find enough evidence to support that 2:1 orbital resonances are disrupted over time.We next examine the impact on our results of formally incorporating measurement uncertainties. In each case we analyze, while uncertainties do affect the numerical value of the odds ratio, our overall conclusions remain the same. We also use updated samples for the 2:1 resonances and stellar obliquities cases and again find our conclusions unchanged. Through simulated 2:1 resonance data, we show that sample size may be more important than measurement precision for drawing a firm conclusion in this case.Finally, we apply our framework to the small planet radius valley. The most favored theories for the formation of the valley are core-powered mass loss and photoevaporation. We compare these hypotheses using the data from the California-Kepler Survey (CKS) and data from the Gaia-Kepler-TESS-Host Stellar Properties (GKTH) catalog. The results from the CKS data depend on the assumptions regarding core mass and initial atmospheric mass fraction, but strongly favor core-powered mass loss when we follow the respective prescriptions from studies on each process. The GKTH data strongly support core-powered mass loss regardless of these assumptions. We do see a dependence of our results on period and stellar temperature, which we will investigate further in the future. 

Subject Added Entry-Topical Term  

Histograms.

Subject Added Entry-Topical Term  

Orbits.

Subject Added Entry-Topical Term  

Statistical physics.

Subject Added Entry-Topical Term  

Astrophysics.

Subject Added Entry-Topical Term  

Applied mathematics.

Subject Added Entry-Topical Term  

Astronomy.

Subject Added Entry-Topical Term  

Computational physics.

Index Term-Uncontrolled  

Jupiters

Index Term-Uncontrolled  

Orbital architectures

Index Term-Uncontrolled  

Planetary parameters

Index Term-Uncontrolled  

Photoevaporation

Index Term-Uncontrolled  

California-Kepler Survey

Added Entry-Corporate Name  

The Pennsylvania State University.

Host Item Entry  

Dissertations Abstracts International. 85-05B.

Host Item Entry  

Dissertation Abstract International

Electronic Location and Access  

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Control Number  

joongbu:639785