THE WISE DETECTION OF AN INFRARED ECHO IN TIDAL DISRUPTION EVENT ASASSN-14li

Jiang, Ning; Dou, Liming; Wang, Tinggui; Yang, Chenwei; Lyu, Jianwei; Zhou, Hongyan

doi:10.3847/2041-8205/828/1/l14

Cited by 108 publications

(101 citation statements)

References 30 publications

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“…The WISE and NEOWISE-R data afford us an excellent opportunity to study the dust reverberation effect of TDEs at theinfrared band (see also our work Jiang et al 2016, and therecent work of van Velzen et al 2016b). Using the full released WISE and NEOWISE-R data, we are examining such dust reverberation effectsin all known TDEs systematically.…”

Section: Resultsmentioning

confidence: 99%

“…The first WISE observations were all more than five years after the peak of the UV/optical burst, and lasted for at least another three years. In contrast to the short echos of ASASSN-14li, for which the mid-IR echo is detectable only in 36-220 days after its UV/optical flare (Jiang et al 2016). Thus, the dust in TDEs with ECLs would be much farther and thicker than that of ASASSN-14li.…”

Section: On the Relation With Coronal Line Emissionmentioning

confidence: 85%

“…There are ∼12 exposures in each epoch, provided by the unique-designed observational cadence of WISE for the detection of intraday variability. Using the same method as described in Jiang et al (2012Jiang et al ( , 2016, we first examine the short-term variability, and find that all magnitudes within each epoch are consistent with being a constant. So we average these magnitudes to yield a mean value for each epoch when examining the long-term variability ( Table 1).…”

Section: The Mid-infrared Light Curvesmentioning

confidence: 99%

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Long Fading Mid-Infrared Emission in Transient Coronal Line Emitters: Dust Echo of a Tidal Disruption Flare

Dou¹,

Wang²,

Jiang³

et al. 2016

ApJ

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The sporadic accretion following the tidal disruption of a star by a super-massive black hole (TDE) leads to a brightUV and soft X-ray flare in the galactic nucleus. The gas and dust surrounding the black hole responses to such a flare with an echo in emission lines and infrared emission. In this paper, we report the detection of long fading mid-IR emission lasting up to 14 years after the flare in four TDE candidates with transient coronal lines using the WISE public data release. We estimate that the reprocessed mid-IR luminosities are in the range betweeń 4 10 42 and2 10 43 erg s −1 and dust temperature in the range of 570-800 K when WISE first detected these sources three to five years after the flare. Both luminosity and dust temperature decrease with time. We interpret the mid-IR emission as the infrared echo of the tidal disruption flare. We estimate the UV luminosity at the peak flare to be 1to 30 times 10 44 erg s −1 and that forwarm dust masses to bein the range of 0.05-1.3  M within a few parsecs. Our results suggest that themid-infrared echo is a general signature of TDE in the gas-rich environment.

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Section: Resultsmentioning

confidence: 99%

Section: On the Relation With Coronal Line Emissionmentioning

confidence: 85%

Section: The Mid-infrared Light Curvesmentioning

confidence: 99%

See 1 more Smart Citation

Long Fading Mid-Infrared Emission in Transient Coronal Line Emitters: Dust Echo of a Tidal Disruption Flare

Dou¹,

Wang²,

Jiang³

et al. 2016

ApJ

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“…Unfortunately, our dataset does not meet the criteria necessary for such an analysis, but reverberation studies in TDEs have recently been attempted (e.g. Jiang et al 2016;Kara et al 2016). …”

Section: Evolution Of the Uvot Photometrymentioning

confidence: 99%

“…This is in contrast with ASASSN-14ae, in which the He ii λ4686 line became stronger relative to the Balmer lines as the event progressed (Brown et al 2016). Unlike the two other ASASSN TDEs, ASASSN-14li showed strong X-ray emission, and, due to it's proximity, was the target of several groundbased (Alexander et al 2016;van Velzen et al 2016;Romero-Cañizales et al 2016), space-based (Miller et al 2015;Cenko et al 2016;Peng, Tang & Wang 2016;Jiang et al 2016), and theoretical efforts (Krolik et al 2016;Kochanek 2016a).…”

Section: Introductionmentioning

confidence: 99%

The Long Term Evolution of ASASSN-14li

Brown

Holoien

Auchettl

et al. 2017

Mon. Not. R. Astron. Soc.

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We present late-time optical spectroscopy taken with the Large Binocular Telescope's Multi-Object Double Spectrograph, late-time Swift UVOT and XRT observations, as well as improved ASAS-SN pre-discovery limits on the nearby (d = 90.3 Mpc, z = 0.0206) tidal disruption event (TDE) ASASSN-14li. The late-time optical spectra show Hα emission well in excess of that seen in the SDSS host galaxy spectrum, indicating that the processes powering the luminous flares associated with TDEs can operate for several hundreds of days. The Swift observations reveal the presence of lingering apparently thermal UV (T UV ∼ 3.5 × 10 4 K) and X-ray (T X ∼ 7 × 10 5 K) emission. The characteristic temperatures evolve by, at most, a factor of ∼ 2 over the 600 day follow-up campaign. The X-ray, UV, and Hα luminosities evolve roughly in tandem and at a rate that is consistent with a power-law decay at late times. This behavior is in stark contrast with the majority of optically discovered TDEs, which are X-ray faint and evolve on shorter timescales. Finally we address how the unique properties of ASASSN-14li can be used to probe the relationship between the TDE rate and host galaxy properties.

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The Astronomy in Ancient China: An Overview

Jiang

2021

History of Science and Technology in China

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Recently, three optical tidal disruption event (TDE) candidates discovered by the Zwicky Transient Facility (ZTF) have been suggested to be coincident with high-energy neutrinos. They all exhibit unusually strong dust infrared (IR) echoes, with their peak times matching the neutrino arrival time even better than the optical peaks. We hereby report on two new TDE candidates that are spatially and temporally coincident with neutrinos by matching our sample of mid-infrared outbursts in nearby galaxies (MIRONG) with Gold alerts of IceCube high-energy neutrino events up to June 2022. The two candidates show negligible optical variability according to their ZTF light curves and can therefore be classified as part of the growing population of obscured TDE candidates. The chance probability of finding two such candidates about ∼ 3% by redistributing the MIRONG sources randomly in the SDSS footprint, which will be as low as ∼ 0.1% (or ∼ 0.2%) if we limit to sources with increased fluxes (or variability amplitudes) comparable with the matched two sources. Our findings further support the potential connection between high-energy neutrinos and TDEs in dusty environments by increasing the total number of neutrino-associated TDE and TDE candidates to five, although the underlying physics remains poorly understood.

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THE WISE DETECTION OF AN INFRARED ECHO IN TIDAL DISRUPTION EVENT ASASSN-14li

Cited by 108 publications

References 30 publications

Long Fading Mid-Infrared Emission in Transient Coronal Line Emitters: Dust Echo of a Tidal Disruption Flare

Long Fading Mid-Infrared Emission in Transient Coronal Line Emitters: Dust Echo of a Tidal Disruption Flare

The Long Term Evolution of ASASSN-14li

The Astronomy in Ancient China: An Overview

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