ASASSN-14ko is a Periodic Nuclear Transient in ESO 253-G003
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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ASASSN-14ko is a Periodic Nuclear Transient in ESO 253-G003. / 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.
I: Astrophysical Journal, Bind 910, Nr. 2, 125, 04.2021.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - ASASSN-14ko is a Periodic Nuclear Transient in ESO 253-G003
AU - Payne, Anna V.
AU - Shappee, Benjamin J.
AU - Hinkle, Jason T.
AU - Vallely, Patrick J.
AU - Kochanek, Christopher S.
AU - Holoien, Thomas W. -S.
AU - Auchettl, Katie
AU - Stanek, K. Z.
AU - Thompson, Todd A.
AU - Neustadt, Jack M. M.
AU - Tucker, Michael A.
AU - Armstrong, James D.
AU - Brimacombe, Joseph
AU - Cacella, Paulo
AU - Cornect, Robert
AU - Denneau, Larry
AU - Fausnaugh, Michael M.
AU - Flewelling, Heather
AU - Grupe, Dirk
AU - Heinze, A. N.
AU - Lopez, Laura A.
AU - Monard, Berto
AU - Prieto, Jose L.
AU - Schneider, Adam C.
AU - Sheppard, Scott S.
AU - Tonry, John L.
AU - Weiland, Henry
PY - 2021/4
Y1 - 2021/4
N2 - 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 P = -0.0017 +/- 0.003 . 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 similar to 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 7.41.1 and UT 2020 December 26.51.4.
AB - 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 P = -0.0017 +/- 0.003 . 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 similar to 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 7.41.1 and UT 2020 December 26.51.4.
KW - Black hole physics
KW - Galaxies
KW - Seyfert galaxies
KW - Galaxy accretion disks
U2 - 10.3847/1538-4357/abe38d
DO - 10.3847/1538-4357/abe38d
M3 - Journal article
VL - 910
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 2
M1 - 125
ER -
ID: 259823673