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Stellar Death in the Nearby Universe

Holoien, Thomas Warren-Son
http://orcid.org/0000-0001-9206-3460
http://rave.ohiolink.edu/etdc/view?acc_num=osu149873738500975

Abstract Details

2017, Doctor of Philosophy, Ohio State University, Astronomy.
The night sky is replete with transient and variable events that help shape our universe. The violent, explosive deaths of stars represent some of the most energetic of these events, as a single star is able to outshine billions during its final moments. Aside from imparting significant energy into their host environments, stellar deaths are also responsible for seeding heavy elements into the universe, regulating star formation in their host galaxies, and affecting the evolution of supermassive black holes at the centers of their host galaxies. The large amount of energy output during these events allows them to be seen from billions of lightyears away, making them useful observational probes of physical processes important to many fields of astronomy. In this dissertation I present a series of observational studies of two classes of transients associated with the deaths of stars in the nearby universe: tidal disruption events (TDEs) and supernovae (SNe). Discovered by the All-Sky Automated Survey for Supernovae (ASAS-SN), the objects I discuss were all bright and nearby, and were subject to extensive follow-up observational campaigns. In the first three studies, I present observational data and theoretical models of ASASSN-14ae, ASASSN-14li, and ASASSN-15oi, three TDEs discovered by ASAS-SN and three of the most well-studied TDEs ever discovered. Next I present the discovery of ASASSN-13co, an SN that does not conform to the traditional model of Type II SNe. Finally, I discuss the full sample of bright SNe discovered from 2014 May 1 through 2016 December 31, which is significantly less biased than previous nearby SN samples due to the ASAS-SN survey approach, and perform statistical analyses on this population that will be used for future studies of nearby SNe and their hosts.
Krzyzstof Stanek (Advisor)
Christopher Kochanek (Advisor)
Todd Thompson (Committee Member)
213 p.
Astronomy
ASAS-SN; supernovae; tidal disruption events; sky surveys

Recommended Citations

Citations

  • Holoien, T. W.-S. (2017). Stellar Death in the Nearby Universe [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu149873738500975

    APA Style (7th edition)

  • Holoien, Thomas. Stellar Death in the Nearby Universe. 2017. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu149873738500975.

    MLA Style (8th edition)

  • Holoien, Thomas. "Stellar Death in the Nearby Universe." Doctoral dissertation, Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu149873738500975

    Chicago Manual of Style (17th edition)

osu149873738500975
319
© 2017, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.