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Discovery and Follow-up of the Unusual Nuclear Transient OGLE17aaj

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arxiv 1901.03718 v1 pith:52C5SDUL submitted 2019-01-11 astro-ph.HE

Discovery and Follow-up of the Unusual Nuclear Transient OGLE17aaj

M. Gromadzki , A. Hamanowicz , L. Wyrzykowski , K. V. Sokolovsky , M. Fraser , Sz. Kozlowski , J. Guillochon , I. Arcavi
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B. Trakhtenbrot P. G. Jonker S. Mattila A. Udalski M. K. Szymanski I. Soszynski R. Poleski P. Pietrukowicz J. Skowron P. Mroz K. Ulaczyk M. Pawlak K. A. Rybicki J. Sollerman F. Taddia Z. Kostrzewa-Rutkowska F. Onori D. R. Young K. Maguire S. J. Smartt C. Inserra A. Gal-Yam A. Rau T.-W. Chen C. R.Angus D. A. H. Buckley
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keywords ogle17aajevolutionfollow-upnucleartransientactivediscoveryevent
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We report on the discovery and follow-up of a peculiar transient, OGLE17aaj, which occurred in the nucleus of a weakly active galaxy. We investigate whether it can be interpreted as a new candidate for a tidal disruption event (TDE). We present the OGLE-IV light curve that covers the slow 60-day-long rise to maximum along with photometric, spectroscopic, and X-ray follow-up during the first year. OGLE17aaj is a nuclear transient exhibiting some properties similar to previously found TDEs, including a long rise time, lack of colour-temperature evolution, and high black-body temperature. On the other hand, its narrow emission lines and slow post-peak evolution are different from previously observed TDEs. Its spectrum and light-curve evolution is similar to F01004-2237 and AT 2017bgt. Signatures of historical low-level nuclear variability suggest that OGLE17aaj may instead be related to a new type of accretion event in active super-massive black holes.

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Cited by 3 Pith papers

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  1. Low-hard to high-soft spectral state transitions in the faintest early-X-ray-detected optical tidal disruption event TDE 2025aarm

    astro-ph.HE 2026-07 conditional novelty 7.0

    TDE 2025aarm is the faintest early-X-ray-detected optical TDE and the first thermal TDE reported to show a low-hard to high-soft X-ray state transition resembling black-hole X-ray binaries.

  2. The Radio Properties of Extreme Coronal Line Emitters: Constraints on the Sub-parsec Environment

    astro-ph.HE 2026-07 conditional novelty 6.0

    About half of low-redshift ECLEs are radio-bright like TDEs/AGN; SED modeling of four shows the ECL gas is clumpy (f_V ~ 10^{-5}-10^{-2}) and spatially distinct from the radio-emitting region.

  3. Low-hard to high-soft spectral state transitions in the faintest early-X-ray-detected optical tidal disruption event TDE 2025aarm

    astro-ph.HE 2026-07 unverdicted novelty 6.0

    TDE 2025aarm exhibits the first reported low-hard to high-soft X-ray state transition in a thermal tidal disruption event, at the faintest early X-ray luminosity yet measured.