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Discovery and follow-up of the unusual nuclear transient OGLE17aaj

Discovery and follow-up of the unusual nuclear transient OGLE17aaj
Discovery and follow-up of the unusual nuclear transient OGLE17aaj

Aims. 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). Methods. 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. Results. 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.

Black hole physics, Galaxy: nucleus
0004-6361
Gromadzki, M.
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Hamanowicz, A.
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Wyrzykowski, L.
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Sokolovsky, K. V.
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Fraser, M.
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Kozłowski, Sz
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Guillochon, J.
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Arcavi, I.
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Trakhtenbrot, B.
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Jonker, P. G.
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Mattila, S.
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Udalski, A.
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Szymański, M. K.
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Soszyński, I.
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Poleski, R.
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Pietrukowicz, P.
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Skowron, J.
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Mróz, P.
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Ulaczyk, K.
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Pawlak, M.
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Rybicki, K. A.
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Sollerman, J.
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Taddia, F.
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Kostrzewa-Rutkowska, Z.
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Onori, F.
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Young, D. R.
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Maguire, K.
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Smartt, S. J.
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Inserra, C.
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Gal-Yam, A.
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Rau, A.
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Chen, T. W.
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Angus, C. R.
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Buckley, D. A.H.
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Gromadzki, M.
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Hamanowicz, A.
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Wyrzykowski, L.
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Sokolovsky, K. V.
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Fraser, M.
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Kozłowski, Sz
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Guillochon, J.
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Arcavi, I.
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Trakhtenbrot, B.
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Jonker, P. G.
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Mattila, S.
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Udalski, A.
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Szymański, M. K.
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Soszyński, I.
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Poleski, R.
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Pietrukowicz, P.
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Skowron, J.
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Mróz, P.
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Ulaczyk, K.
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Pawlak, M.
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Rybicki, K. A.
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Sollerman, J.
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Taddia, F.
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Kostrzewa-Rutkowska, Z.
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Onori, F.
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Young, D. R.
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Maguire, K.
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Smartt, S. J.
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Inserra, C.
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Gal-Yam, A.
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Rau, A.
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Chen, T. W.
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Angus, C. R.
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Buckley, D. A.H.
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Gromadzki, M., Hamanowicz, A., Wyrzykowski, L., Sokolovsky, K. V., Fraser, M., Kozłowski, Sz, Guillochon, J., Arcavi, I., Trakhtenbrot, B., Jonker, P. G., Mattila, S., Udalski, A., Szymański, M. K., Soszyński, I., Poleski, R., Pietrukowicz, P., Skowron, J., Mróz, P., Ulaczyk, K., Pawlak, M., Rybicki, K. A., Sollerman, J., Taddia, F., Kostrzewa-Rutkowska, Z., Onori, F., Young, D. R., Maguire, K., Smartt, S. J., Inserra, C., Gal-Yam, A., Rau, A., Chen, T. W., Angus, C. R. and Buckley, D. A.H. (2019) Discovery and follow-up of the unusual nuclear transient OGLE17aaj. Astronomy & Astrophysics, 622. (doi:10.1051/0004-6361/201833682).

Record type: Article

Abstract

Aims. 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). Methods. 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. Results. 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.

Text
Discovery and Follow-up of the Unusual Nuclear Transient OGLE17aaj - Accepted Manuscript
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Accepted/In Press date: 4 January 2019
Published date: 1 February 2019
Additional Information: Author Young, D has confirmed that Arxiv record is AM
Keywords: Black hole physics, Galaxy: nucleus

Identifiers

Local EPrints ID: 428450
URI: https://eprints.soton.ac.uk/id/eprint/428450
ISSN: 0004-6361
PURE UUID: b294f7dd-f4ab-4029-b938-043b609840b8
ORCID for C. Inserra: ORCID iD orcid.org/0000-0002-3968-4409

Catalogue record

Date deposited: 27 Feb 2019 17:30
Last modified: 19 Jul 2019 16:41

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Contributors

Author: M. Gromadzki
Author: A. Hamanowicz
Author: L. Wyrzykowski
Author: K. V. Sokolovsky
Author: M. Fraser
Author: Sz Kozłowski
Author: J. Guillochon
Author: I. Arcavi
Author: B. Trakhtenbrot
Author: P. G. Jonker
Author: S. Mattila
Author: A. Udalski
Author: M. K. Szymański
Author: I. Soszyński
Author: R. Poleski
Author: P. Pietrukowicz
Author: J. Skowron
Author: P. Mróz
Author: K. Ulaczyk
Author: M. Pawlak
Author: K. A. Rybicki
Author: J. Sollerman
Author: F. Taddia
Author: Z. Kostrzewa-Rutkowska
Author: F. Onori
Author: D. R. Young
Author: K. Maguire
Author: S. J. Smartt
Author: C. Inserra ORCID iD
Author: A. Gal-Yam
Author: A. Rau
Author: T. W. Chen
Author: C. R. Angus
Author: D. A.H. Buckley

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