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:Pathway to Type Iax Supernovae: 3D Hydrodynamical Sim. of Oxyge n-Neon and Carbon-Oxygen White Dwarfby Chackochan Joji Abstract: Type Ia supernovae (SNe Ia) are among the most common types of luminous as trophysical transients. They are thought to arise from the thermonuclear e xplosion of mass-accreting white dwarfs (WDs) in binary systems. Due to th eir consistent peak luminosities, SNe Ia are used as standardizable candle s to measure the expansion rate of the universe. 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 identi ﬁed as the remnant of the historical supernova SN 1181, which reveals an unusual ﬁlamentary morphology with a WD at its center. Recent studies i ndicate that SN 1181 was likely a sub-luminous event, classiﬁed as a Typ e Iax supernova, possibly originating from a merger between carbon-oxygen (C/O) and oxygen-neon (O/Ne) WDs. In this thesis, we investigate failed de tonations of Type Iax supernovae within the context of the double-degenera te merger channel. Speciﬁcally, we consider a binary system consisting o f a C/O WD and an O/Ne WD. In this scenario, the secondary C/O WD is tidal ly 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 largely intact. The total nuclear energy released in this event is lower than that of a n ormal SNe Ia, consistent with the properties of the SNe Iax. We further ex plore the detonation mechanism, the characteristics of the resulting remna nt, and the broader implications of this model for understanding the physi cs of Type Iax supernovae. Advisor: Dr. Robert Fisher, Department of Physi cs (Robert.fisher@umassd.edu) Committee Members: Dr. David K agan, Department of PhysicsDr. Renuka Rajapkse, Department of Physics Note : All PHY Graduate Students are encouraged to attend.\nEvent page: https:/ /www.umassd.edu/events/cms/physics-master-of-science-thesis-defense-by-cha ckochan-joji.php X-ALT-DESC;FMTTYPE=text/html:

Pathway to Type Iax Supernovae: 3D Hydrodynamical Sim. of Oxygen-Neon and Carbon-Oxygen White Dwarf
by Chackochan Joji

Abstract:

Type Ia supernovae ( SNe Ia) are among the most common types of luminous astrophysical transien ts. They are thought to arise from the thermonuclear explosion of mass-acc reting white dwarfs (WDs) in binary systems. Due to their consistent peak luminosities\, SNe Ia are used as standardizable candles to measure the ex pansion rate of the universe. A subluminous subclass of these events\, kno wn as Type Iax supernovae\, is believed to be the result of a failed or pa rtial detonation of WDs. Pa 30 has recently been identiﬁed as the remnan t of the historical supernova SN 1181\, which reveals an unusual ﬁlament ary morphology with a WD at its center. Recent studies indicate that SN 11 81 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 detonatio ns of Type Iax supernovae within the context of the double-degenerate merg er channel. Speciﬁcally\, we consider a binary system consisting of a C/ O WD and an O/Ne WD. In this scenario\, the secondary C/O WD is tidally di srupted and merges with the O/Ne WD\, forming an accretion disk around the primary. Due to instabilities within the disk\, a carbon detonation is tr iggered on the surface of the primary\, while leaving it largely intact. T he total nuclear energy released in this event is lower than that of a nor mal SNe Ia\, consistent with the properties of the SNe Iax. We further exp lore the detonation mechanism\, the characteristics of the resulting remna nt\, and the broader implications of this model for understanding the phys ics of Type Iax supernovae.

Advisor:
Dr. Robert Fisher\, Dep artment of Physics (Robert.fisher@umassd.edu)

Committee Members:
Dr. David Kagan\, Department of Physics
Dr. Renuka Rajapkse\, Department of Physics

Note:
All PHY Graduate Stu dents are encouraged to attend.

Event page: https://www.umassd.edu/events/cms/physics-maste r-of-science-thesis-defense-by-chackochan-joji.php

DTSTAMP:20260418T055502 DTSTART;TZID=America/New_York:20260507T093000 DTEND;TZID=America/New_York:20260507T110000 LOCATION:SENG 201 SUMMARY;LANGUAGE=en-us:Physics Master of Science Thesis Defense by Chackoch an Joji UID:a64ff51dad899486f37eeaac3c15060b@www.umassd.edu END:VEVENT END:VCALENDAR