BEGIN:VCALENDAR VERSION:2.0 X-WR-CALNAME:EventsCalendar PRODID:-//hacksw/handcal//NONSGML v1.0//EN CALSCALE:GREGORIAN BEGIN:VTIMEZONE TZID:America/New_York LAST-MODIFIED:20240422T053451Z TZURL:https://www.tzurl.org/zoneinfo-outlook/America/New_York X-LIC-LOCATION:America/New_York BEGIN:DAYLIGHT TZNAME:EDT TZOFFSETFROM:-0500 TZOFFSETTO:-0400 DTSTART:19700308T020000 RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=2SU END:DAYLIGHT BEGIN:STANDARD TZNAME:EST TZOFFSETFROM:-0400 TZOFFSETTO:-0500 DTSTART:19701101T020000 RRULE:FREQ=YEARLY;BYMONTH=11;BYDAY=1SU END:STANDARD END:VTIMEZONE BEGIN:VEVENT CATEGORIES:College of Engineering,Lectures and Seminars,Thesis/Dissertation s DESCRIPTION:Abstract: Type Ia supernovae (SNe Ia) are among the mo st common types of luminous astrophysical transients. They are thought to arise from the thermonuclear explosion of mass-accreting white dwarfs (WDs ) in binary systems. Due to their consistent peak luminosities, SNe Ia are used as standardizable candles to measure the expansion rate of the unive rse. A subluminous subclass of these events, known as Type Iax supernovae, is believed to be the result of a failed or partial detonation of WDs. Pa 30 has recently been identiﬁed as the remnant of the historical superno va SN 1181, which reveals an unusual ﬁlamentary morphology with a WD at its center. Recent studies indicate that SN 1181 was likely a sub-luminous event, classiﬁed as a Type Iax supernova, possibly originating from a m erger between carbon-oxygen (C/O) and oxygen-neon (O/Ne) WDs. In this thes is, we investigate failed detonations of Type Iax supernovae within the co ntext of the double-degenerate merger channel. Speciﬁcally, we consider a binary system consisting of a C/O WD and an O/Ne WD. In this scenario, t he secondary C/O WD is tidally disrupted and merges with the O/Ne WD, form ing an accretion disk around the primary. Due to instabilities within the disk, a carbon detonation is triggered on the surface of the primary, whil e leaving it largely intact. The total nuclear energy released in this eve nt is lower than that of a normal SNe Ia, consistent with the properties o f the SNe Iax. We further explore the detonation mechanism, the characteri stics of the resulting remnant, and the broader implications of this model for understanding the physics of Type Iax supernovae. Advisor:Dr. Robert Fisher, Department of Physics (Robert.fisher@umassd.edu) Committee members : Dr. David Kagan, Department of PhysicsDr. Renuka Rajapkse, D epartment of Physics \nEvent page: https://www.umassd.edu/events/cms/ physics-master-of-science-thesis-defense--by-chackochan-joji.php X-ALT-DESC;FMTTYPE=text/html:

Abstract:

Type Ia supernovae (SNe Ia) are among the most common types of luminous astrop hysical transients. They are thought to arise from the thermonuclear explo sion of mass-accreting white dwarfs (WDs) in binary systems. Due to their consistent peak luminosities\, SNe Ia are used as standardizable candles t o measure the expansion rate of the universe. A subluminous subclass of th ese events\, known as Type Iax supernovae\, is believed to be the result o f a failed or partial detonation of WDs. Pa 30 has recently been identiﬁ ed as the remnant of the historical supernova SN 1181\, which reveals an u nusual ﬁlamentary morphology with a WD at its center. Recent studies ind icate that SN 1181 was likely a sub-luminous event\, classiﬁed as a Type Iax supernova\, possibly originating from a merger between carbon-oxygen (C/O) and oxygen-neon (O/Ne) WDs.

In this thesis\, we investigate failed detonations of Type Iax supernovae within the context of the double -degenerate merger channel. Speciﬁcally\, we consider a binary system co nsisting of a C/O WD and an O/Ne WD. In this scenario\, the secondary C/O WD is tidally disrupted and merges with the O/Ne WD\, forming an accretion disk around the primary. Due to instabilities within the disk\, a carbon detonation is triggered on the surface of the primary\, while leaving it l argely intact. The total nuclear energy released in this event is lower th an that of a normal SNe Ia\, consistent with the properties of the SNe Iax . We further explore the detonation mechanism\, the characteristics of the resulting remnant\, and the broader implications of this model for unders tanding the physics of Type Iax supernovae.

Advisor:
Dr. Robe rt Fisher\, Department of Physics (Robert.fisher@umassd.edu)

Commi ttee members:
Dr. David Kagan\, Department of Physics
Dr. Renuka Rajapkse\, Department of Physics

Event page: https://www.umassd.edu/eve nts/cms/physics-master-of-science-thesis-defense--by-chackochan-joji.php

DTSTAMP:20260418T061026 DTSTART;TZID=America/New_York:20260506T144500 DTEND;TZID=America/New_York:20260506T161500 LOCATION:SENG 201 SUMMARY;LANGUAGE=en-us:Physics Master of Science Thesis Defense by Chackoc han Joji UID:764a777bf02e3536f2ff6873d8d52a0b@www.umassd.edu END:VEVENT END:VCALENDAR