The landscape of relativistic stellar explosions / Anna Y.Q. Ho.

Format:

Book

Author/Creator:

Ho, Anna Y. Q., author.

Series:

Springer theses

Language:

English

Subjects (All):

Stars.

Stellar activity.

Relativistic astrophysics.

Gamma ray bursts.

Genre:

Electronic books.

Physical Description:

1 online resource (xxi, 307 pages) : illustrations.

Place of Publication:

Cham : Springer, [2022]

Summary:

This thesis reports the discovery of relativistic stellar explosions outside of the gamma ray band, using optical time domain surveys. It is well known that some massive stars end their lives with the formation of a compact object (a neutron star or black hole) that launches a relativistic jet detectable from earth as a burst of gamma rays. It has long been suspected, however, that gamma ray bursts are only the tip of the iceberg in a broad landscape of relativistic explosions, and so the results presented in this thesis represent a major breakthrough. Highlights of this thesis include: characterization of the first major new class of relativistic explosions in a decade; the discovery of abrupt end-of-life mass-loss in a surprisingly diverse range of stars; and the routine discovery of afterglow emission and several events that may represent baryonically dirty jets or jets viewed slightly off axis. These discoveries necessitated the solution of difficult technical challenges such as the identification of rare and fleeting "needles" in a vast haystack of time-varying phenomena in the night sky, and responding to discoveries within hours to obtain data across the electromagnetic spectrum from X-rays to radio wavelengths. .

Contents:

Intro

Supervisor's Foreword

Acknowledgments

Parts of This Thesis Have Been Published in the Following Journal Articles

Contents

1 Introduction and Summary

1.1 Landscape Overview

The GRB View

The Ic-BL SN View

Radio Unification Efforts

1.2 Summary of Thesis

References

Part I Afterglows at Cosmological Distances

2 ZTF20aajnksq (AT2020blt): A Fast Optical Transient at z 2.9 With No Detected Gamma-Ray Burst Counterpart

2.1 Introduction

2.2 Observations

ZTF Discovery

Follow-up Observations

Optical Imaging

Optical Spectroscopy

X-Ray Observations

Radio Observations

Search for Associated GRB

2.3 Comparison to GRB Afterglows

Optical Light Curve

Spectral Energy Distribution

Radio Light Curve

2.4 Interpretation

A Slightly Off-Axis GRB

A Dirty Fireball

2.5 Summary and Conclusions

3 iPTF Archival Search for Fast Optical Transients

3.1 Introduction

3.2 Data and Candidate Selection

3.3 Properties of the iPTF M-dwarf Flares

3.4 Rate of Relativistic Fast Optical Transients in iPTF

3.5 Conclusions

3.6 Appendix

Part II Low-Luminosity Gamma-Ray Bursts

4 SN2020bvc: A Broad-Lined Type Ic Supernova with a Double-Peaked Optical Light Curve and a Luminous X-ray and Radio Counterpart

4.1 Introduction

4.2 Observations

ZTF Detection and Classification

Host Galaxy

Optical Photometry

Spectroscopy

UV and X-Ray Observations

Submillimeter and Radio Observations

Search for a Gamma-Ray Burst

4.3 Light Curve Analysis

Comparisons to Other Ic-BL SNe

Blackbody Fits

4.4 Spectroscopic Properties

Spectroscopic Evolution and Comparisons

Velocity Estimates from Fe II Features

4.5 Modeling the Light Curve

Nickel Decay

Shock-Cooling

4.6 Modeling the Fast Ejecta

Radio Emission

X-Ray Emission

4.7 Early ZTF Light Curves of Nearby Ic-BL SNe

4.8 Summary and Discussion

4.9 Appendix

Photometry Table

Details: Mass and Radius of the Extended Material

Details: Properties of the Forward Shock

Inverse Compton Scattering

Part III Ic-BL Supernovae

Reference

5 The Broad-Lined Ic Supernova ZTF18aaqjovh (SN2018bvw): An Optically Discovered Engine-Driven Supernova Candidate with Luminous Radio Emission

5.1 Introduction

5.2 Observations

Zwicky Transient Facility Discovery

Spectral Classification

X-Ray Observations

Search for Gamma-Rays

5.3 Analysis and Discussion

Modeling the Optical Light Curve

Properties of the Fastest (Radio-Emitting) Ejecta

Modeling the Radio to X-Ray SED

Gamma-Ray Burst

5.4 Summary and Conclusions

6 Evidence for Late-Stage Eruptive Mass Loss in the Progenitor to SN2018gep, a Broad-Lined Ic Supernova: Pre-explosion Emission and a Rapidly Rising Luminous Transient

6.1 Introduction

6.2 Observations

Zwicky Transient Facility Discovery

Notes:

"Doctoral thesis accepted by California Institute of Technology, in USA."

Includes bibliographical references.

Online resource; title from PDF title page (SpringerLink, viewed November 17, 2022).

ISBN:

9783031153679

3031153677

OCLC:

1350618697

Access Restriction:

Restricted for use by site license.