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Two Sides of the Same Coin: Bringing Transients to Light with NICER and ASAS-SN

Presentation #403.04 in the session Advances in Black Hole Spectral Timing On All Scales with NICER.

Published onJul 01, 2023
Two Sides of the Same Coin: Bringing Transients to Light with NICER and ASAS-SN

The All-Sky Automated Survey for Supernovae (ASAS-SN) is, for the first time, monitoring the entire visible sky for the violent, variable, and transient events that shape our universe. By combining ASAS-SN transients with observations from the Neutron star Interior Composition ExploreR (NICER) we are quickly gaining new insights into accretion onto black holes both big and small. In this talk, I will discuss a handful of representative examples that demonstrate this pairing. I will first talk about the rise of a new black hole low-mass X-ray binary ASASSN-18ey (MAXI J1820+070). I will then venture onto supermassive black holes with the X-ray and UV luminous Tidal Disruption Event (TDE) ASASSN-19dj. The cause of nuclear transients is, however, not always so clear. I will then discuss investigations into two Ambiguous Nuclear Transients (ANTs), ASASSN-18el and ASASSN-20hx. Finally, I will present the intriguing X-ray properties of the first repeating partial TDE candidate, ASASSN-14ko.

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