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68 papers · 1 filter
Probable Quasi-Periodic Oscillations in the {\tt TESS} observations of blazars in the Swift X-ray Survey
Ashutosh Tripathi, Paul J. Wiita, Krista Lynne Smith
This work presents possible quasi-periodic oscillations in the Transiting Exoplanet Survey Satellite observations of blazars that are in the 157-month hard X-ray survey done by Swi…
Application of time-series analysis methods to a multiple-sector TESS observations: the case of the radio-loud blazar 3C 371
Ashutosh Tripathi, Paul J. Wiita, Ryne Dingler +4
We present various time series analysis methods to analyze multiple-sector observations of bright AGN from the Transiting Exoplanet Survey Satellite (TESS) and examine whether issu…
Testing X-ray Reprocessing and Mapping the Soft Excess of NGC 7469 with NICER
Ethan R. Partington, Edward M. Cackett, Rick Edelson +5
We present an X-ray/UV reverberation analysis of NGC 7469 across 210 days, using daily NICER observations with contemporaneous monitoring by Swift UVOT+XRT. We model the X-ray spec…
Optical Spectroscopy of Type Ia Supernovae by the Carnegie Supernova Projects I and II
N. Morrell, M. M. Phillips, G. Folatelli +57
We present the second and final release of optical spectroscopy of Type Ia Supernovae (SNe Ia) obtained during the first and second phases of the Carnegie Supernova Project (CSP-I…
Possible Circumstellar Interaction Origin of the Early Excess Emission in Thermonuclear Supernovae
Maokai Hu, Lifan Wang, Xiaofeng Wang +1
Type Ia supernovae (SNe Ia) arise from the thermonuclear explosion in binary systems involving carbon-oxygen white dwarfs (WDs). The pathway of WDs acquiring mass may produce circu…
An independent determination of the distance to supernova SN 1987A by means of the light echo AT 2019xis
Aleksandar Cikota, Jiachen Ding, Lifan Wang +5
Accurate distance determination to astrophysical objects is essential for the understanding of their intrinsic brightness and size. The distance to SN 1987A has been previously mea…