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Payne, Anna V.; Shappee, Benjamin J.; Hinkle, Jason T.; Vallely, Patrick J.; Kochanek, Christopher S.; Holoien, Thomas W.-S.; Auchettl, Katie; Stanek, K. Z.; Thompson, Todd A.; Neustadt, Jack M. M.; Tucker, Michael A.; Armstrong, James D.; Brimacombe, Joseph; Cacella, Paulo; Cornect, Robert; Denneau, Larry; Fausnaugh, Michael M.; Flewelling, Heather; Grupe, Dirk; Heinze, A. N.; Lopez, Laura A.; Monard, Berto; Prieto, Jose L.; Schneider, Adam C.; Sheppard, Scott S.; Tonry, John L.; Weiland, Henry
The Astrophysical journal, 04/2021, Letnik: 910, Številka: 2Journal Article
Abstract 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 period of P 0 = 114.2 ± 0.4 days and a period derivative of . The most recent outburst in 2020 May, which took place as predicted, exhibited spectroscopic changes during the rise and had a UV bright, blackbody spectral energy distribution similar to tidal disruption events (TDEs). The X-ray flux decreased by a factor of 4 at the beginning of the outburst and then returned to its quiescent flux after ∼8 days. The Transiting Exoplanet Survey Satellite observed an outburst during Sectors 4–6, revealing a rise time of 5.60 ± 0.05 days in the optical and a decline that is best fit with an exponential model. We discuss several possible scenarios to explain ASASSN-14ko’s periodic outbursts, but currently favor a repeated partial TDE. The next outbursts should peak in the optical on UT 2020 September 7.4±1.1 and UT 2020 December 26.5±1.4.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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