Tidal Disruption Events through the Lens of the Cooling Envelope Model

Sarin, Nikhil; Metzger, Brian D.

doi:10.3847/2041-8213/ad16d8

Cited by 4 publications

(1 citation statement)

References 113 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For the disruption of solar-like stars with R p = r t , the debris circularization efficiency (h µ M c • 2 3 ) decreases more slowly than the disk efficiency (h µ ~M (Sarin & Metzger 2024). TDEMASS assumes that the UV emission originates from shocks near the apocenter of the most bound debris (Piran et al 2015), while REDBACK postulates that the UV emission arises from the cooling envelope formed by the returning debris (Metzger 2022).…”

Section: The Origin Of the Uv/optical Emissionmentioning

confidence: 99%

AT2018fyk: Candidate Tidal Disruption Event by a (Super)Massive Black Hole Binary

Wen,

Jonker,

Levan

et al. 2024

ApJ

View full text Add to dashboard Cite

The tidal disruption event (TDE) AT2018fyk has unusual X-ray, UV, and optical light curves that decay over the first ∼600 days, rebrighten, and decay again around 1200 days. We explain this behavior as a one-off TDE associated with a massive black hole (BH) binary. The sharp drop-offs from t −5/3 power laws at around 600 days naturally arise when one BH interrupts the debris fallback onto the other BH. The BH mass M • derived from fitting X-ray spectra with a slim disk accretion model and, independently, from fitting the early UV/optical light curves, is smaller by 2 orders of magnitude than predicted from the M •–σ * host galaxy relation, suggesting that the debris is accreted onto the secondary, with the fallback cut off by the primary. Furthermore, if the rebrightening were associated with the primary, it should occur around 5000 days, not the observed 1200 days. The secondary’s mass and dimensionless spin is M • , s = 2.7 − 1.5 + 0.5 × 10 5 M ⊙ and a •,s > 0.3 (X-ray spectral fitting), while the primary’s mass is M •,p = 107.7±0.4 M ⊙ (M •–σ * relation). An intermediate mass BH secondary is consistent with the observed UV/optical light-curve decay, i.e., the secondary’s outer accretion disk is too faint to produce a detectable emission floor. The time of the first accretion cutoff constrains the binary separation to be (6.7 ± 1.2) × 10−3 pc. X-ray spectral fitting and timing analyses indicate that the hard X-rays arise from a corona above the secondary’s disk. The early UV/optical emission, suggesting a super-Eddington phase for the secondary, possibly originates from shocks arising from debris circularization.

show abstract

Section: The Origin Of the Uv/optical Emissionmentioning

confidence: 99%

AT2018fyk: Candidate Tidal Disruption Event by a (Super)Massive Black Hole Binary

Wen,

Jonker,

Levan

et al. 2024

ApJ

View full text Add to dashboard Cite

show abstract

Discovery and follow-up of ASASSN-23bd (AT 2023clx): the lowest redshift and luminosity optically selected tidal disruption event

Hoogendam,

Hinkle,

Shappee

et al. 2024

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

We report the All-Sky Automated Survey for SuperNovae discovery of the tidal disruption event (TDE) ASASSN-23bd (AT 2023clx) in NGC 3799, a LINER galaxy with no evidence of strong AGN activity over the past decade. With a redshift of z = 0.01107 and a peak UV/optical luminosity of (5.4 ± 0.4) × 1042 erg s−1, ASASSN-23bd is the lowest-redshift and least-luminous TDE discovered to date. Spectroscopically, ASASSN-23bd shows Hα and He i emission throughout its spectral time series, there are no coronal lines in its NIR spectrum, and the UV spectrum shows nitrogen lines without the strong carbon and magnesium lines typically seen for AGN. Fits to the rising ASAS-SN light curve show that ASASSN-23bd started to brighten on MJD 59988$^{+1}_{-1}$, ∼9 days before discovery, with a nearly linear rise in flux, peaking in the g band on MJD $60000^{+3}_{-3}$. Scaling relations and TDE light curve modelling find a black hole mass of ∼106 M⊙, which is on the lower end of supermassive black hole masses. ASASSN-23bd is a dim X-ray source, with an upper limit of L0.3 − 10 keV < 1.0 × 1040 erg s−1 from stacking all Swift observations prior to MJD 60061, but with soft (∼0.1 keV) thermal emission with a luminosity of L0.3 − 2 keV ∼ 4 × 1039 erg s−1 in XMM-Newton observations on MJD 60095. The rapid (t < 15 days) light curve rise, low UV/optical luminosity, and a luminosity decline over 40 days of ΔL40 ≈ −0.7 dex make ASASSN-23bd one of the dimmest TDEs to date and a member of the growing ‘Low Luminosity and Fast’ class of TDEs.

show abstract

redback: a Bayesian inference software package for electromagnetic transients

Sarin,

Hübner,

Omand

et al. 2024

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

Fulfilling the rich promise of rapid advances in time-domain astronomy is only possible through confronting our observations with physical models and extracting the parameters that best describe what we see. Here, we introduce Redback; a Bayesian inference software package for electromagnetic transients. Redback provides an object-orientated python interface to over 12 different samplers and over 100 different models for kilonovae, supernovae, gamma-ray burst afterglows, tidal disruption events, engine-driven transients among other explosive transients. The models range in complexity from simple analytical and semi-analytical models to surrogates built upon numerical simulations accelerated via machine learning. Redback also provides a simple interface for downloading and processing data from various catalogs such as Swift and Fink. The software can also serve as an engine to simulate transients for telescopes such as the Zwicky Transient Facility and Vera Rubin with realistic cadences, limiting magnitudes, and sky-coverage or a hypothetical user-constructed survey or a generic transient for target-of-opportunity observations with different telescopes. As a demonstration of its capabilities, we show how Redback can be used to jointly fit the spectrum and photometry of a kilonova, enabling a more powerful, holistic probe into the properties of a transient. We also showcase general examples of how Redback can be used as a tool to simulate transients for realistic surveys, fit models to real, simulated, or private data, multi-messenger inference with gravitational waves, and serve as an end-to-end software toolkit for parameter estimation and interpreting the nature of electromagnetic transients.

show abstract

Tidal Disruption Events through the Lens of the Cooling Envelope Model

Cited by 4 publications

References 113 publications

AT2018fyk: Candidate Tidal Disruption Event by a (Super)Massive Black Hole Binary

AT2018fyk: Candidate Tidal Disruption Event by a (Super)Massive Black Hole Binary

Discovery and follow-up of ASASSN-23bd (AT 2023clx): the lowest redshift and luminosity optically selected tidal disruption event

redback: a Bayesian inference software package for electromagnetic transients

Contact Info

Product

Resources

About