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Estimating Ejecta Mass Ratios in Kepler's SNR: Global X-Ray Spectral Analysis Including Suzaku Systematics and Emitting Volume Uncertainties
Tyler Holland-Ashford, Patrick Slane, Laura A. Lopez +2
The exact origins of many Type Ia supernovae$\unicode{x2013}$progenitor scenarios and explosive mechanisms$\unicode{x2013}$remain uncertain. In this work, we analyze the global Suz…
Probing the Soft X-ray Properties and Multi-Wavelength Variability of SN2023ixf and its Progenitor
Sonja Panjkov, Katie Auchettl, Benjamin J. Shappee +3
We present a detailed analysis of nearly two decades of optical/UV and X-ray data to study the multi-wavelength pre-explosion properties and post-explosion X-ray properties of near…
A Multiwavelength Study of the Massive Colliding Wind Binary WR 20a: A Possible Progenitor for Fast-Spinning LIGO Binary Black Hole Mergers
Grace M. Olivier, Laura A. Lopez, Katie Auchettl +7
WR 20a is the most massive close-in binary known in our Galaxy. It is composed of two 80 M Wolf-Rayet stars with a short period of 3.7 days in the open cl…
X-ray Properties of NGC 253's Starburst-Driven Outflow
Sebastian Lopez, Laura A. Lopez, Dustin D. Nguyen +5
We analyze image and spectral data from 365~ks of observations from the {\it Chandra} X-ray Observatory of the nearby, edge-on starburst galaxy NGC 253 to constrain proper…
Three-dimensional morphological asymmetries in the ejecta of Cassiopeia A using a component separation method in X-rays
Adrien Picquenot, Fabio Acero, Tyler Holland-Ashford +2
Recent simulations have shown that asymmetries in the ejecta distribution of supernova remnants (SNR) can still reflect asymmetries from the initial supernova explosion. Thus, thei…
ASASSN-14ko is a Periodic Nuclear Transient in ESO 253-G003
Anna V. Payne, Benjamin J. Shappee, Jason T. Hinkle +24
We present the discovery that ASASSN-14ko is a periodically flaring AGN at the center of the galaxy ESO 253-G003. At the time of its discovery by the All-Sky Automated Survey for S…