The large-scale magnetic fields of planet-hosting solar-type stars

Mengel, Matthew W. (2017) The large-scale magnetic fields of planet-hosting solar-type stars. [Thesis (PhD/Research)]

[img]
Preview
Text (Whole Thesis)
Matthew Mengel - 0018851099 - Final Thesis.pdf

Download (4MB) | Preview

Abstract

Stellar magnetic fields and their associated phenomena influence stellar behaviour and evolution, and potentially have significant impacts on any surrounding planetary system. However, the nature of star-planet interactions is unclear, especially the potential impact on a star of a closely orbiting massive planet with a powerful magnetic field.

This thesis presents a spectropolarimetric survey of the large-scale magnetic fields of planet-hosting solar-type stars. While little evidence is found for a systematic difference in the magnetic field characteristics of planet-hosting stars compared with the population of solar-type stars, a small positive correlation is indicated between the magnitude of the tidal effects of the planet on the star and the magnetic field strength. Nevertheless, further spectropolarimetric observations of hot Jupiter hosting systems are required to confirm this tentative relationship.

For the particular case of a moderately active star with a thin convective zone and a closely orbiting hot Jupiter (T Boötis) presented here, a remarkably rapid magnetic cycle with a period of - 240 d is discovered. For stars with shallow convective envelopes, this is an unusual occurrence and suggests a possible role for planetary tidal or magnetic interaction with the star’s convective zone and magnetic dynamo. More observations are required to verify this possible star-planet interaction and to extend the work to other similar systems as they come to light from exoplanet surveys.


Statistics for USQ ePrint 38107
Statistics for this ePrint Item
Item Type: Thesis (PhD/Research)
Item Status: Live Archive
Additional Information: Doctor of Philosophy (PhD) thesis.
Faculty/School / Institute/Centre: Historic - Faculty of Health, Engineering and Sciences - School of Agricultural, Computational and Environmental Sciences (1 Jul 2013 - 5 Sep 2019)
Faculty/School / Institute/Centre: Historic - Faculty of Health, Engineering and Sciences - School of Agricultural, Computational and Environmental Sciences (1 Jul 2013 - 5 Sep 2019)
Supervisors: Marsden, Stephen C.; Carter, Bradley D.; Fares, Rim
Date Deposited: 14 Feb 2020 02:07
Last Modified: 21 Apr 2021 01:47
Uncontrolled Keywords: stellar magnetic fields, stars, magnetic fields, planetary systems
Fields of Research (2008): 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Identification Number or DOI: doi:10.26192/1nc9-fe53
URI: http://eprints.usq.edu.au/id/eprint/38107

Actions (login required)

View Item Archive Repository Staff Only