To TDE or not to TDE: The luminous transient ASASSN-18jd with TDE-like and AGN-like qualities

Abstract

We present the discovery of ASASSN-18jd (AT 2018bcb), a luminous optical/UV/X-ray transient located in the nucleus of the galaxy 2MASX J22434289--1659083 at $z=0.1192$. Over the year after discovery, Swift UVOT photometry shows the UV SED of the transient to be well modeled by a slowly shrinking blackbody with temperature $T\sim 2.5\times 10^4\mathrm{K}$, a maximum observed luminosity of $L_{\text{max}}=4.5_{-0.3}^{+0.6}\times 10^{44}\mathrm{erg}{\mathrm{s}}^{-1}$, and a radiated energy of $E=9.6_{-0.6}^{+1.1}\times 10^{51}\mathrm{erg}$. X-ray data from Swift XRT and XMM-Newton show a transient, variable X-ray flux with blackbody and power-law components that fade by nearly an order of magnitude over the following year. Optical spectra show strong, roughly constant broad Balmer emission as well as transient features attributable to He II, N III-V, O III, and coronal Fe. While ASASSN-18jd shares similarities with Tidal Disruption Events (TDEs), it is also similar to the newly-discovered nuclear transients seen in quiescent galaxies and faint Active Galactic Nuclei (AGNs).

arXiv comment24 pages, 16 figures, 2 machine-readable tables (included as ancillary txt files)

References in corpus (99)

• Stellar population synthesis at the resolution of 2003
• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• Star Formation in Galaxies Along the Hubble Sequence
• The Host Galaxies of AGN
• The Leiden/Argentine/Bonn (LAB) Survey of Galactic HI: Final data release of the combined LDS and IAR surveys with improved stray-radiation corrections
• Detailed Structural Decomposition of Galaxy Images
• Theoretical Modeling of Starburst Galaxies
• The Swift X-ray Telescope
• The Galaxy Evolution Explorer: A Space Ultraviolet Survey Mission
• The Swift Ultra-Violet/Optical Telescope
• The Man Behind the Curtain: X-rays Drive the UV through NIR Variability in the 2013 AGN Outburst in NGC 2617
• Composite Quasar Spectra From the Sloan Digital Sky Survey
• Central Masses and Broad-Line Region Sizes of Active Galactic Nuclei. II. A Homogeneous Analysis of a Large Reverberation-Mapping Database
• Revisiting the Scaling Relations of Black Hole Masses and Host Galaxy Properties
• First Results from the Catalina Real-time Transient Survey
• Las Cumbres Observatory Global Telescope Network
• A Cosmology Calculator for the World Wide Web
• Astrometry.net: Blind astrometric calibration of arbitrary astronomical images
• An ultra-deep near-infrared spectrum of a compact quiescent galaxy at z=2.2
• Physical Properties of Wolf-Rayet Stars
• Photometric Calibration of the Swift Ultraviolet/Optical Telescope
• Mid-Infrared Selection of AGN with the Wide-Field Infrared Survey Explorer. I. Characterizing WISE-Selected AGN in COSMOS
• WISeREP - An Interactive Supernova Data Repository
• The Pan-STARRS1 Surveys
• The Radius-Luminosity Relationship for Active Galactic Nuclei: The Effect of Host-Galaxy Starlight on Luminosity Measurements II. The Full Sample of Reverberation-Mapped AGNs
• A relativistic jetted outburst from a massive black hole fed by a tidally disrupted star
• An X-ray spectral study of 24 type-1 AGN
• Discovery of the Onset of Rapid Accretion by a Dormant Massive Black Hole
• BAT AGN Spectroscopic Survey - V. X-ray properties of the Swift/BAT 70-month AGN catalog
• Hydrodynamical Simulations to Determine the Feeding Rate of Black Holes by the Tidal Disruption of Stars: The Importance of the Impact Parameter and Stellar Structure
• Second ROSAT all-sky survey (2RXS) source catalogue
• A Continuum of H- to He-Rich Tidal Disruption Candidates With a Preference for E+A Galaxies
• Mid-Infrared Selection of Active Galactic Nuclei with the Wide-Field Infrared Survey Explorer. II. Properties of WISE-Selected Active Galactic Nuclei in the NDWFS Boötes Field
• Swift J2058.4+0516: Discovery of a Possible Second Relativistic Tidal Disruption Flare?
• X-ray spectral properties of AGN in the Chandra Deep Field South
• A unified model for tidal disruption events
• Multiband lightcurves of tidal disruption events
• Six Months of Multi-Wavelength Follow-up of the Tidal Disruption Candidate ASASSN-14li and Implied TDE Rates from ASAS-SN
• A Systematic Search for Changing-Look Quasars in SDSS
• ASASSN-14ae: A Tidal Disruption Event at 200 Mpc
• New physical insights about Tidal Disruption Events from a comprehensive observational inventory at X-ray wavelengths
• Paper II: Calibration of the Swift ultraviolet/optical telescope
• What the Optical Recombination Lines Can Tell Us About the Broad Line Regions of Active Galactic Nuclei
• The X-ray through Optical Fluxes and Line Strengths of Tidal Disruption Events
• Analysis of optical Fe II emission in a sample of AGN spectra
• PS16dtm: A Tidal Disruption Event in a Narrow-line Seyfert 1 Galaxy
• 1ES 1927+654: An AGN Caught Changing Look on a Timescale of Months
• ASASSN-15oi: A Rapidly Evolving, Luminous Tidal Disruption Event at 216 Mpc
• Revisiting optical tidal disruption events with iPTF16axa
• Black hole masses of tidal disruption event host galaxies
• The Tidal Disruption of Giant Stars and Their Contribution to the Flaring Supermassive Black Hole Population
• iPTF16fnl: a faint and fast tidal disruption event in an E+A galaxy
• Evidence for rapid disk formation and reprocessing in the X-ray bright tidal disruption event AT 2018fyk
• Late-time UV observations of tidal disruption flares reveal unobscured, compact accretion disks
• Systematic Uncertainties in Black Hole Masses Determined from Single Epoch Spectra
• The Chandra COSMOS-Legacy survey: Source X-ray spectral properties
• iPTF Discovery of the Rapid "Turn On" of a Luminous Quasar
• X-ray Brightening and UV Fading of Tidal Disruption Event ASASSN-15oi
• Spectral Variability of Quasars in the Sloan Digital Sky Survey. I: Wavelength Dependence
• Tidal Disruption Event (TDE) Demographics
• Extreme Coronal Line Emitters: Tidal Disruption of Stars by Massive Black Holes in Galactic Nuclei?
• Understanding extreme quasar optical variability with CRTS: I. Major AGN flares
• The spectral evolution of AT 2018dyb and the presence of metal lines in tidal disruption events
• The first tidal disruption flare in ZTF: from photometric selection to multi-wavelength characterization
• A New Class of Changing-Look LINERs
• Hypercalibration: A Pan-STARRS1-based recalibration of the Sloan Digital Sky Survey
• The Broad Absorption Line Tidal Disruption Event iPTF15af: Optical and Ultraviolet Evolution
• PS18kh: A New Tidal Disruption Event with a Non-Axisymmetric Accretion Disk
• A new class of flares from accreting supermassive black holes
• Discovery and Early Evolution of ASASSN-19bt, the First TDE Detected by TESS
• Black hole masses of tidal disruption event host galaxies II
• Ultrafast Outflow in Tidal Disruption Event ASASSN-14li
• What Sets the Line Profiles in Tidal Disruption Events?
• NTT, Spitzer and Chandra spectroscopy of SDSSJ095209.56+214313.3: the most luminous coronal-line supernova ever observed, or a stellar tidal disruption event ?
• X-ray spectral properties of the AGN sample in the northern XMM-XXL field
• Transient Super-strong Coronal Lines and Broad Bumps in the Galaxy SDSS J074820.67+471214.3
• Evidence for Large Temperature Fluctuations in Quasar Accretion Disks From Spectral Variability
• A population of highly energetic transient events in the centres of active galaxies
• An Ultraviolet Spectrum of the Tidal Disruption Flare ASASSN-14li
• Comparison of the X-ray emission from Tidal Disruption Events with those of Active Galactic Nuclei
• The Ultraviolet Spectroscopic Evolution of the Low-Luminosity Tidal Disruption Event iPTF16fnl
• A search for changing-look AGN in the Grossan catalog
• The tidal disruption event AT2017eqx: spectroscopic evolution from hydrogen rich to poor suggests an atmosphere and outflow
• The Long Term Evolution of ASASSN-14li
• Discovery of Highly Blueshifted Broad Balmer and Metastable Helium Absorption Lines in a Tidal Disruption Event
• The Unusual Late-Time Evolution of the Tidal Disruption Event ASASSN-15oi
• Slow blue nuclear hypervariables in PanSTARRS-1
• A comparison between SALT/SAAO observations and kilonova models for AT 2017gfo: the first electromagnetic counterpart of a gravitational wave transient - GW170817
• Rapid "Turn-on" of type 1 AGN in a quiescent early type galaxy SDSS1115+0544
• A New Observational Upper Limit to the Low Redshift Ionizing Background Radiation
• Late time multi wavelength observations of Swift J1644+5734: A luminous optical/IR bump and quiescent X-ray emission
• Insights into Tidal Disruption of Stars from PS1-10jh
• The production of strong broad He II emission after the tidal disruption of a main-sequence star by a supermassive black hole
• Hello Darkness My Old Friend: The Fading of the Nearby TDE ASASSN-14ae
• Discovery and Follow-up of the Unusual Nuclear Transient OGLE17aaj
• Cleaning the USNO-B Catalog through automatic detection of optical artifacts
• The He II Fowler lines and the O III and N III Bowen fluorescence lines in the symbiotic nova RR Tel
• The GALEX Time Domain Survey. II. Wavelength-Dependent Variability of Active Galactic Nuclei in the Pan-STARRS1 Medium Deep Survey

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• The Rapid X-ray and UV Evolution of ASASSN-14ko
• Examining a Peak-Luminosity/Decline-Rate Relationship for Tidal Disruption Events
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• Discovery of the luminous X-ray ignition eRASSt J234402.9$-$352640; I. Tidal disruption event or a rapid increase in accretion in an active galactic nucleus?
• Recurring tidal disruption events a decade apart in IRAS F01004-2237
• The ASAS-SN Bright Supernova Catalog -- V. 2018-2020
• Scary Barbie: An Extremely Energetic, Long-Duration Tidal Disruption Event Candidate Without a Detected Host Galaxy at z = 0.995
• Application of The Wind-Driven Model to A Sample of Tidal Disruption Events
• A maximum X-ray luminosity scale of disc-dominated tidal disruption events
• Multiple Flares in the Changing-Look AGN NGC 5273
• Discovery and Follow-up of ASASSN-23bd (AT 2023clx): The Lowest Redshift and Least Luminous Tidal Disruption Event To Date
• The nascent milliquasar VT J154843.06+220812.6: tidal disruption event or extreme accretion-state change?
• Hard X-ray emission from a Compton scattering corona in large black hole mass tidal disruption events
• Optical Rebrightening of Extragalactic Transients from the Zwicky Transient Facility
• SCAT Uncovers ATLAS's First Tidal Disruption Event ATLAS18mlw: A Faint and Fast TDE in a Quiescent Balmer Strong Galaxy
• The rate of extreme coronal line emitting galaxies in the Sloan Digital Sky Survey and their relation to tidal disruption events
• TESS Shines Light on the Origin of the Ambiguous Nuclear Transient ASASSN-18el
• Flaires: A Comprehensive Catalog of Dust-Echo-like Infrared Flares
• Ultraviolet Spectral Evidence for Ansky as a Slowly Evolving Featureless Tidal Disruption Event with Quasiperiodic Eruptions
• AT 2018dyk: tidal disruption event or active galactic nucleus? Follow-up observations of an extreme coronal line emitter with the Dark Energy Spectroscopic Instrument
• AT2021acak: a candidate tidal disruption event found in the Zwicky Transient Facility survey
• An X-ray View of the Ambiguous Nuclear Transient AT2019pev
• Long-term Evolution of the Short-term X-ray Variability of the Jetted TDE Swift J1644+57
• Long-term Mid-infrared Color Variations of Narrow-Line Seyfert 1 Galaxies
• The X-ray variability of tidal disruption events
• Radio and X-ray flux rebrightening six years after outburst in a partially-obscured extreme changing-look AGN
• Discovery of a Featureless Tidal Disruption Event at z~1 with the Wide Field Survey Telescope
• Early results in the search for extreme coronal line emitters with the Dark Energy Spectroscopic Instrument