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SN 2018is: a low-luminosity Type IIP supernova with narrow hydrogen emission lines at early phases
R. Dastidar, K. Misra, S. Valenti +31
We present a comprehensive photometric and spectroscopic study of the Type IIP SN 2018is. The -band luminosity and the expansion velocity at 50 days post-explosion are 15.1$\…
The fall of CSS100217: a tidal disruption-induced low state in an apparently hostless active galactic nucleus
G. Cannizzaro, A. J. Levan, S. van Velzen +1
CSS100217 was a nuclear, rapid and luminous flare in a Narrow-Line Seyfert 1 galaxy, whose initial interpretation as a supernova is now debated between variability of the active ga…
The nuclear transient AT 2017gge: a tidal disruption event in a dusty and gas-rich environment and the awakening of a dormant SMBH
F. Onori, G. Cannizzaro, P. G. Jonker +28
We present the results from a dense multi-wavelength (optical/UV, near-infrared (IR), and X-ray) follow-up campaign of the nuclear transient AT2017gge, covering a total of 1698 day…
Probing for the host galaxies of the fast X-ray transients XRT 000519 and XRT 110103
D. Eappachen, P. G. Jonker, M. Fraser +13
Over the past few years, 30 extragalactic fast X-ray transients (FXRTs) have been discovered, mainly in Chandra and XMM-Newton data. Their nature remains unclear, with propos…
An elliptical accretion disk following the tidal disruption event AT 2020zso
T. Wevers, M. Nicholl, M. Guolo +25
[Abridged] We classify AT 2020zso as a TDE based on the blackbody evolution inferred from UV/optical photometric observations, and spectral line content and evolution. We identify…
How low can you go? SN 2018zd as a low-mass Fe core-collapse supernova
E. Callis, M. Fraser, A. Pastorello +38
We present spectroscopy and photometry of SN 2018zd, a Type IIP core-collapse supernova with signatures of interaction with circumstantial material in its earliest spectra. High io…
Host Galaxy Line Diagnostics for the Candidate Tidal Disruption Events XMMSL1 J111527.3+180638 and PTF09axc
Anne Inkenhaag, Peter G. Jonker, Giacomo Cannizzaro +2
We present results of our analysis of spectra of the host galaxies of the candidate Tidal Disruption Events (TDEs) XMMSL1 J111527.3+180638 and PTF09axc to determine the nature of t…
A detailed spectroscopic study of Tidal Disruption Events
P. Charalampopoulos, G. Leloudas, D. B. Malesani +19
Spectroscopically, TDEs are characterized by broad ( 10 km/s) emission lines and show large diversity as well as different line profiles. After carefully and consistently per…
Intermediate-luminosity red transients: Spectrophotometric properties and connection to electron-capture supernova explosions
Y. -Z. Cai, A. Pastorello, M. Fraser +56
We present the spectroscopic and photometric study of five intermediate-luminosity red transients (ILRTs), namely AT 2010dn, AT 2012jc, AT 2013la, AT 2013lb, and AT 2018aes. They s…
Spectroscopic monitoring of the candidate tidal disruption event in F01004-2237
Giacomo Cannizzaro, Peter G. Jonker, Daniel Mata-Sánchez
We present results of spectroscopic monitoring observations of the Ultra-Luminous Infra Red Galaxy F01004-2237. This galaxy was observed to undergo changes in its optical spectrum,…
Accretion disc cooling and narrow absorption lines in the tidal disruption event AT 2019dsg
G. Cannizzaro, T. Wevers, P. G. Jonker +23
We present the results of a large multi-wavelength follow-up campaign of the Tidal Disruption Event (TDE) \dsg, focusing on low to high resolution optical spectroscopy, X-ray, and…
An outflow powers the optical rise of the nearby, fast-evolving tidal disruption event AT2019qiz
M. Nicholl, T. Wevers, S. R. Oates +42
At 66 Mpc, AT2019qiz is the closest optical tidal disruption event (TDE) to date, with a luminosity intermediate between the bulk of the population and iPTF16fnl. Its proximity all…
AT 2017gbl: a dust obscured TDE candidate in a luminous infrared galaxy
E. C. Kool, T. M. Reynolds, S. Mattila +26
We present the discovery with Keck of the extremely infrared (IR) luminous transient AT 2017gbl, coincident with the Northern nucleus of the luminous infrared galaxy (LIRG) IRAS 23…
Extreme variability in an active galactic nucleus: Gaia16aax
G. Cannizzaro, M. Fraser, P. G. Jonker +12
We present the results of a multi-wavelength follow up campaign for the luminous nuclear transient Gaia16aax, which was first identified in January 2016. The transient is spatially…
The transitional gap transient AT 2018hso: new insights on the luminous red nova phenomenon
Y-Z. Cai, A. Pastorello, M. Fraser +20
Aims: AT 2018hso is a new transient showing transitional properties between those of LRNe and the class of intermediate luminosity red transients (ILRTs) similar to SN 2008S. Throu…
Optical follow-up of the tidal disruption event iPTF16fnl: new insights from X-shooter observations
F. Onori, G. Cannizzaro, P. G. Jonker +11
We present the results from Nordic Optical Telescope and X-shooter follow-up campaigns of the tidal disruption event (TDE) iPTF16fnl, covering the first 100 days after the tr…
The spectral evolution of AT 2018dyb and the presence of metal lines in tidal disruption events
Giorgos Leloudas, Lixin Dai, Iair Arcavi +29
We present light curves and spectra of the tidal disruption event (TDE) ASASSN-18pg / AT 2018dyb spanning a period of one year. The event shows a plethora of strong emission lines,…
A kilonova as the electromagnetic counterpart to a gravitational-wave source
S. J. Smartt, T. -W. Chen, A. Jerkstrand +118
Gravitational waves were discovered with the detection of binary black hole mergers and they should also be detectable from lower mass neutron star mergers. These are predicted to…
The discovery, monitoring and environment of SGR J1935+2154
G. L. Israel, P. Esposito, N. Rea +9
We report on the discovery of a new member of the magnetar class, SGR J1935+2154, and on its timing and spectral properties measured by an extensive observational campaign carried…