SIMBAD references

2021ApJ...910..125P - Astrophys. J., 910, 125-125 (2021/April-1)

ASASSN-14ko is a periodic nuclear transient in ESO 253-G003.

PAYNE A.V., SHAPPEE B.J., HINKLE J.T., VALLELY P.J., KOCHANEK C.S., HOLOIEN T.W.-S., AUCHETTL K., STANEK K.Z., THOMPSON T.A., NEUSTADT J.M.M., TUCKER M.A., ARMSTRONG J.D., BRIMACOMBE J., CACELLA P., CORNECT R., DENNEAU L., FAUSNAUGH M.M., FLEWELLING H., GRUPE D., HEINZE A.N., LOPEZ L.A., MONARD B., PRIETO J.L., SCHNEIDER A.C., SHEPPARD S.S., TONRY J.L. and WEILAND H.

Abstract (from CDS):

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 P0 = 114.2 ± 0.4 days and a period derivative of {dot}P=-0.0017±0.0003. 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.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): Black hole physics - Galaxies - Seyfert galaxies - Galaxy accretion disks

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 13

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2021.06.24-20:56:38

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