자료유형  

 학위논문

Control Number  

0016932323

International Standard Book Number  

9798379603878

Dewey Decimal Classification Number  

520

Main Entry-Personal Name  

McGruder, Chima.

Publication, Distribution, etc. (Imprint  

[S.l.] : Harvard University., 2023

Publication, Distribution, etc. (Imprint  

Ann Arbor : ProQuest Dissertations & Theses, 2023

Physical Description  

1 online resource(209 p.)

General Note  

Source: Dissertations Abstracts International, Volume: 84-12, Section: B.

General Note  

Advisor: Lopez-Morales, Mercedes.

Dissertation Note  

Thesis (Ph.D.)--Harvard University, 2023.

Restrictions on Access Note  

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

Summary, Etc.  

요약High altitude aerosols prevent our ability to probe exoplanet atmospheres, by muting or completely obscuring molecular and atomic features. Unfortunately, the vast majority of planets are obscured by high altitude aerosols, and currently there is no way to a priori determine which planets are likely to be unobscured. Isolating a few system parameters that have strong correlations to high altitude aerosol formation would be invaluable for further atmospheric studies and lead to optimal usage of the next generation of facilities like JWST, ARIEL, and the ground-based ELTs. Towards this end, we have identified a subset of planets that are ideal to test correlations between stellar metallicity or high-energy irradiation levels and cloud coverage in exoplanet atmospheres. The most current comparative studies looking for correlations between the atmospheric properties of gas giants and parameters such as their masses, radii, stellar irradiation levels, stellar metallicities, etc, have yielded no clear trends likely because they are fitting too many parameters simultaneously to very small numbers of planets. Our subsets of seven planets differ because they match in most parameters, coined "The Similar Seven". In essence, these planets provide a control sample to search for correlations amongst the few differing properties (stellar metallicity and high-energy irradiation).This thesis provides the reduction and analysis techniques found to be most effective to process and detrend ground-based multi-slit spectroscopic data, with specific focus on Magellan/IMACS data. Our routines were initially implemented for WASP-31b, which is not apart of our similar seven sample. In addition new spectra of WASP-25b, WASP-96b, and WASP-124b, three of the seven spectra in our sample, are provided here. This leaves HATS-29b and WASP-55b that still need spectral observations, given that spectra of WASP-6b and WASP-110b have already been published. With the available five spectra we find a tentative correlation with optical atomic features, a proxy for high-altitude aerosol levels, and host star metallicity. This tentative correlation was found after homogeneously rederiving the stellar, planetary, and orbital parameters of every system in the sample in order to reduce biases when comparing parameters of each system. Though the precision of some of the transmission spectra is not high enough to strongly support the tentative trend, if found to be true this trend has the potential to be foundational in theoretical and observational exoplanet atmospheric studies. As such, there is planned work to more precisely measure optical data and obtain observations in both longer and shorter wavelengths.

Subject Added Entry-Topical Term  

Astronomy.

Subject Added Entry-Topical Term  

Planetology.

Index Term-Uncontrolled  

Aerosol formation

Index Term-Uncontrolled  

Planetary systems

Index Term-Uncontrolled  

Atmospheric studies

Index Term-Uncontrolled  

Exoplanet atmospheres

Index Term-Uncontrolled  

High-energy irradiation

Added Entry-Corporate Name  

Harvard University Astronomy

Host Item Entry  

Dissertations Abstracts International. 84-12B.

Host Item Entry  

Dissertation Abstract International

Electronic Location and Access  

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Control Number  

joongbu:642043