ASASSN-14ko is a Periodic Nuclear Transient in ESO 253-G003

  title={ASASSN-14ko is a Periodic Nuclear Transient in ESO 253-G003},
  author={Anna V. Payne and Benjamin. J. Shappee and Jason T. Hinkle and Patrick J. Vallely and Christopher S. Kochanek and Thomas W.-S. Holoien and Katie Auchettl and Krzysztof Zbigniew Stanek and Todd A. Thompson and Jack M. M. Neustadt and Michael A. Tucker and James D. Armstrong and Joseph Brimacombe and Paulo Cacella and Robert Cornect and Larry Denneau and Michael M. Fausnaugh and Heather Flewelling and Dirk Grupe and A. N. Heinze and Laura A. Lopez and Berto Monard and Jos{\'e} Luis Prieto and Adam C. Schneider and Scott S. Sheppard and John L. Tonry and Henry Weiland},
  journal={The Astrophysical Journal},
We present the discovery that ASASSN-14ko is a periodically flaring active galactic nucleus at the center of the galaxy ESO 253-G003. At the time of its discovery by the All-Sky Automated Survey for Supernovae (ASAS-SN), it was classified as a supernova close to the nucleus. The subsequent 6 yr of V- and g-band ASAS-SN observations revealed that ASASSN-14ko has nuclear flares occurring at regular intervals. The 17 observed outbursts show evidence of a decreasing period over time, with a mean… Expand
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