2025MNRAS.540..871C

Query : 2025MNRAS.540..871C

2025MNRAS.540..871C - Mon. Not. R. Astron. Soc., 540, 871-906 (2025/June-2)

AT 2018dyk: tidal disruption event or active galactic nucleus? Follow-up observations of an extreme coronal line emitter with the Dark Energy Spectroscopic Instrument.

CLARK P., CALLOW J., GRAUR O., GREENWELL C., HU L., AGUILAR J., AHLEN S., BIANCHI D., BROOKS D., CLAYBAUGH T., DAWSON K., DE LA MACORRA A., DOEL P., GONTCHO A GONTCHO S., GUTIERREZ G., HONSCHEID K., JUNEAU S., KEHOE R., KISNER T., KREMIN A., LANDRIAU M., LE GUILLOU L., MEISNER A., MIQUEL R., MOUSTAKAS J., PEREZ-RAFOLS I., SANCHEZ E., SCHUBNELL M., SPRAYBERRY D., TARLE G., WEAVER B.A. and ZOU H.

Abstract (from CDS):

We present fresh insights into the nature of the tidal disruption event (TDE) candidate AT 2018dyk. AT 2018dyk has sparked a debate in the literature around its classification as either a bona-fide TDE or as an active galactic nucleus (AGN) turn-on state change. A new follow-up spectrum taken with the Dark Energy Spectroscopic Instrument, in combination with host-galaxy analysis using archival SDSS-MaNGA data, supports the identification of AT 2018dyk as a TDE. Specifically, we classify this object as a TDE that occurred within a gas-rich environment, which was responsible for both its mid-infrared (MIR) outburst and development of Fe coronal emission lines. Comparison with the known sample of TDE-linked extreme coronal line emitters (TDE-ECLEs) and other TDEs displaying coronal emission lines (CrL-TDEs) reveals similar characteristics and shared properties. For example, the MIR properties of both groups appear to form a continuum with links to the content and density of the material in their local environments. This includes evidence for a MIR colour-luminosity relationship in TDEs occurring within such gas-rich environments, with those with larger MIR outbursts also exhibiting redder peaks.

Abstract Copyright: © 2025 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.

Journal keyword(s): galaxies: active - transients: tidal disruption events

Simbad objects: 49

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Number of rows : 49
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 AT 2022upj ev 00 23 56.846 -14 25 23.22           ~ 30 0
2 LEDA 924801 G 00 23 56.88045 -14 25 24.0431           ~ 4 0
3 SDSS J011306.68+093712.2 G 01 13 06.68334 +09 37 12.2526           ~ 2 0
4 LEDA 1154714 Sy1 01 17 03.5826317664 +00 00 27.366719364   17.29 16.79     ~ 54 0
5 SN 2018gn SN* 01 46 42.385 +32 30 27.18           SNII 17 0
6 Z 503-19 G 01 46 42.4472209128 +32 30 29.310902640   15.7       ~ 15 0
7 AT 2021dms ev 03 21 24.069 -11 08 45.71           ~ 7 0
8 MCG-02-09-033 G 03 21 24.0758044704 -11 08 45.753469260   15   14.59   ~ 8 0
9 AT 2019qiz ev 04 46 37.880 -10 13 34.92           ~ 143 0
10 LEDA 980815 GiC 04 46 37.8815409720 -10 13 34.877088156   15.83   14.42   ~ 22 0
11 [GBM2015] SDSS 1737-53055-369 SN SN* 07 48 20.6 +47 12 14           SNII 2 0
12 2MASS J07482067+4712138 G 07 48 20.6613335097 +47 12 14.238929915           ~ 40 0
13 Z 119-12 SyG 08 13 16.9505119752 +22 38 53.905852212           ~ 156 0
14 LEDA 3091244 Sy2 08 17 26.4185083032 +10 12 10.128166884   18.33 17.74     ~ 20 0
15 AT 2018gkr ev 08 17 26.42 +10 12 10.1           ~ 5 0
16 AT 2019avd Sy1 08 23 36.80 +04 23 03.4           ~ 47 0
17 SDSS J082338.23+042258.3 G 08 23 38.23421 +04 22 58.2922           ~ 1 0
18 AT 2018ivp AGN 09 15 31.06 +48 14 08.0           ~ 6 0
19 SN 2005ip SN* 09 32 06.42 +08 26 44.4 18.1 18.7 18.5     SNIIn 230 1
20 2MASX J09380164+1353168 H2G 09 38 01.6413038856 +13 53 16.963519812           ~ 15 0
21 2MASS J09520955+2143132 Sy2 09 52 09.5610270816 +21 43 13.317315096   18.56 18.10     ~ 60 0
22 AT 2020vdq ev 10 08 53.440 +42 43 00.23           ~ 37 0
23 SDSS J103447.90+152922.4 G 10 34 47.89899 +15 29 22.4255           ~ 1 0
24 AT 2021acak ev 10 34 47.900 +15 29 22.38           ~ 7 0
25 LEDA 1760642 Sy1 10 40 44.9995237608 +26 02 59.826752916   18.16 17.64     ~ 14 0
26 2MASS J10552641+5637129 Sy1 10 55 26.4177979872 +56 37 13.112098176   18.32 17.93     ~ 21 0
27 AT 2023jke ev 10 55 26.478 +56 37 13.39           ~ 2 0
28 AT 2018cdp AGN 11 33 55.83 +67 01 08.0           ~ 7 0
29 2MASX J11335602+6701073 Sy1 11 33 55.9428441072 +67 01 07.065822252   15.63 15.01     ~ 26 0
30 AT 2018lnh AGN 12 25 50.31 +51 08 46.5           ~ 7 0
31 2MASS J12255032+5108463 Sy2 12 25 50.3126609064 +51 08 46.343020956   20.16 18.92     ~ 9 0
32 LEDA 2244532 AGN 12 41 34.2616596312 +44 26 39.194539836           ~ 26 0
33 2MASX J12540375+4914533 LIN 12 54 03.7857304968 +49 14 52.887081300           ~ 11 1
34 AT 2018aij ev 12 54 03.80 +49 14 52.9           ~ 6 0
35 2MASX J13424441+0530560 AG? 13 42 44.4175903032 +05 30 56.125206936           ~ 25 0
36 2MASS J13500150+2916097 Sy1 13 50 01.4888917152 +29 16 09.591646332           ~ 22 0
37 Z 49-155 Sy1 15 24 16.6702264008 +04 51 19.027331064   16.70 16.26     ~ 70 0
38 AT 2022fpx ev 15 31 03.700 +53 24 19.26           ~ 19 0
39 SDSS J153104.92+532409.2 G 15 31 04.92293 +53 24 09.3318           ~ 1 0
40 AT 2018dyk ev 15 33 08.01 +44 32 08.2           ~ 33 0
41 Z 249-30 Sy2 15 33 08.0214265848 +44 32 08.480628600   15.3       ~ 41 0
42 VT J154843.06+220812.6 ev 15 48 43.06 +22 08 12.6           ~ 6 0
43 2MASX J15484303+2208128 G 15 48 43.0651778573 +22 08 12.687956497           ~ 9 0
44 SDSS J155440.25+362952.0 QSO 15 54 40.2638373096 +36 29 51.977032152           ~ 29 0
45 AT 2017gge ev 16 20 34.86 +24 07 25.6           ~ 30 0
46 LEDA 1700288 G 16 20 34.9939234728 +24 07 26.512500684           ~ 11 0
47 AT 2021qth ev 20 11 38.926 -21 09 36.64           ~ 11 0
48 2MASX J22434289-1659083 G 22 43 42.8758942080 -16 59 08.515594104           ~ 5 0
49 AT 2018bcb ev 22 43 42.90 -16 59 08.1           ~ 39 0

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