Optical-Ultraviolet Tidal Disruption Events

Velzen, S. van; Holoien, T. W. S.; Onori, F.; Hung, T.; Arcavi, I.

doi:10.1007/s11214-020-00753-z

Cited by 164 publications

(143 citation statements)

References 112 publications

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“…ZTF has detected 19 spectroscopically confirmed TDEs, 16 of which were originally presented in van Velzen et al (2020b), and 3 of which that have been detected by ZTF but have not yet been reported in the literature. The light curves and spectra of these three new TDEs will be presented in E. K. Hammerstein et al (2021, in preparation).…”

Section: Ztf Tde Host Galaxiesmentioning

confidence: 74%

“…The light curves and spectra of these three new TDEs will be presented in E. K. Hammerstein et al (2021, in preparation). The discovery history for the first 16 can be found in van Velzen et al (2020b). We present this sample in Table 1 with the redshift, host galaxy stellar mass, and TDE class.…”

Section: Ztf Tde Host Galaxiesmentioning

confidence: 99%

“…. Stellar population synthesis of the preflare photometry, obtained from SDSS, Pan-STARRS1 (PS1), and GALEX was used to estimate the total stellar mass of each galaxy as well as obtain extinction-corrected, synthetic rest-frame colors (see van Velzen et al 2020b). We adopt the same model choices as Mendel et al (2014), a catalog we use for our comparison sample.…”

Section: Ztf Tde Host Galaxiesmentioning

confidence: 99%

“…TDEs occur when a star is kicked into an orbit that brings it close enough to the SMBH to be tidally disrupted and accreted (e.g., Hills 1975;Frank & Rees 1976;Rees 1988). These events are observed as bright, nuclear flares and have been discovered via observations from X-ray to optical wavelengths (Saxton et al 2020;van Velzen et al 2020a). In order for these TDEs to be observable, the star's tidal disruption radius must be outside of the SMBH event horizon.…”

Section: Introductionmentioning

confidence: 99%

“…The ZTF sample selection criteria are also totally agnostic to host galaxy type, apart from rejecting galaxies that can be classified as broad-line active galactic nucleus (AGN), and is therefore a prime sample for understanding properties of TDE host galaxies. See van Velzen et al (2020b) for a more detailed overview of the ZTF alert filtering and photometric selection criteria used to discover new TDEs. We then perform further follow-up of TDE candidates with spectroscopy to confirm the TDE classification and determine the TDE spectral class, discussed further in Section 2.1, as well as to perform UV monitoring with Swift.…”

Section: Introductionmentioning

confidence: 99%

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Tidal Disruption Event Hosts Are Green and Centrally Concentrated: Signatures of a Post-merger System

Hammerstein

Gezari

Velzen

et al. 2021

ApJL

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We study the properties of the galaxies hosting the first 19 tidal disruption events (TDEs) detected with the Zwicky Transient Facility (ZTF) within the context of a carefully constructed, representative host galaxy sample. We find that the ZTF sample of TDE hosts is dominated by compact "green valley" galaxies. After we restrict the comparison sample to galaxies with a similar concentration, as measured by the Sérsic index, we find this green valley overrepresentation is even larger. That is, concentrated red sequence galaxies are not producing TDEs at elevated levels. We present host galaxy spectra that show that E + A galaxies are overrepresented in the ZTF sample by a factor of ≈22, which is lower than previous TDE host galaxy studies have found. We find that this overrepresentation can be fully accounted for when taking into account the masses, colors, and Sérsic indices of the ZTF TDE hosts. The combination of both green colors and high Sérsic index of the typical TDE host galaxy could be explained if the TDE rate is temporarily enhanced following a merger that leads to a higher central concentration of stars.

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Section: Ztf Tde Host Galaxiesmentioning

confidence: 74%

Section: Ztf Tde Host Galaxiesmentioning

confidence: 99%

Section: Ztf Tde Host Galaxiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Tidal Disruption Event Hosts Are Green and Centrally Concentrated: Signatures of a Post-merger System

Hammerstein

Gezari

Velzen

et al. 2021

ApJL

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Distinguishing Tidal Disruption Events from Impostors

Zabludoff

Arcavi

Massa³

et al. 2021

Space Sci Rev

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Reverberation in Tidal Disruption Events: Dust Echoes, Coronal Emission Lines, Multi-wavelength Cross-correlations, and QPOs

et al. 2021

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Stellar tidal disruption events (TDEs) are typically discovered by transient emission due to accretion or shocks of the stellar debris. Yet this luminous flare can be reprocessed by gas or dust that inhabits a galactic nucleus, resulting in multiple reverberation signals. Nuclear dust heated by the TDE will lead to an echo at infrared wavelengths (1-10 μm) and transient coronal lines in optical spectra of TDEs trace reverberation by gas that orbits the black hole. Both of these signal have been detected, here we review this rapidly developing field. We also review the results that have been extracted from TDEs with high-quality X-ray light curves: quasi periodic oscillations (QPOs), reverberation lags of fluorescence lines, and cross-correlations with emission at other wavelengths. The observational techniques that are covered in this review probe the emission from TDEs over a wide range of scales: from $\sim 1$ ∼ 1 light year to the innermost parts of the newly formed accretion disk. They provide insights into important properties of TDEs such as their bolometric output and the geometry of the accretion flow. While reverberation signals are not detected for every TDE, we anticipate they will become more commonplace when the next generation of X-ray and infrared instruments become operational.

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Optical-Ultraviolet Tidal Disruption Events

Cited by 164 publications

References 112 publications

Tidal Disruption Event Hosts Are Green and Centrally Concentrated: Signatures of a Post-merger System

Tidal Disruption Event Hosts Are Green and Centrally Concentrated: Signatures of a Post-merger System

Distinguishing Tidal Disruption Events from Impostors

Reverberation in Tidal Disruption Events: Dust Echoes, Coronal Emission Lines, Multi-wavelength Cross-correlations, and QPOs

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