Atidal disruption event (TDE) is atransient astronomical source produced when astar passes so close to asupermassive black hole (SMBH) that it is pulled apart by the black hole'stidal force.^[2][3] The star undergoesspaghettification, producing atidal stream of material that loops around the black hole. Some portion of the stellar material is captured into orbit, forming anaccretion disk around the black hole, which emitselectromagnetic radiation. In a small fraction of TDEs, arelativistic jet is also produced. As the material in the disk is gradually consumed by the black hole, the TDE fades over several months or years. TheJames Webb Space Telescope is detecting more TDEs because of its ability to detect infra-red light when a star is consumed^[4] .

TDEs were predicted in the 1970s and first observed in the 1990s. Over a hundred have since been observed, with detections at optical, infrared, radio and X-ray wavelengths. Sometimes a star can survive the encounter with an SMBH, leaving a remnant; those events are termed partial TDEs.^[5][6]

TDEs were first theorized byJack G. Hills in 1975.^[7] A consequence of a star getting sufficiently close to a SMBH that the tidal forces between the star will overcome the star'sself-gravity. In 1988Martin Rees described how approximately half of the disrupted stellar material will remain bound, eventually accreting onto the black hole and forming a luminous accretion disk.^[8]

According to early^[when?] studies, tidal disruption events are an inevitable consequence of massive black holes' activity hidden in galaxy nuclei. Later theorists concluded that the resulting explosion or flare of radiation from the accretion of the stellar debris could reveal the presence of a dormant black hole in the center of a normal galaxy.^[9]

TDEs were first observed in the early 1990s using the X-rayROSAT All-Sky Survey.^[10]

As of May 2024^[update], roughly 100 TDEs are known,^[11][12][13] and have been discovered through several astronomical methods. such as optical transient surveys includingZwicky Transient Facility (ZTF)^[13] and theAll Sky Automated Survey for SuperNovae (ASAS-SN).^[14] Other TDEs have been discovered in X-rays, using theROSAT,XMM-Newton, andeROSITA.^[15] TDEs have also been discovered in theultraviolet.^[16]

Thelight curves of TDEs have an initially sharp rise in brightness, as the disrupted stellar material falls towards the black hole, followed by a more gradual decline lasting months or years. During the declining phase, the luminosity is proportional to${\displaystyle t^{-5/3}}$, where t is time,^[17] although some TDEs have been observed to deviate from the typical${\displaystyle t^{-5/3}}$rate.^[18] These properties allow TDEs to be distinguished from othertransient astronomical sources, such assupernovae. The peak luminosity of TDEs is proportional to the central black hole mass; it can approach or exceed that of their host galaxies, making them some of the brightest sources observed in the Universe.^[19]

There are two broad classes of TDEs. The majority of TDEs consist of "non-relativistic" events, where the outflows from the TDE are akin to the energetics seen inType Ib and Ic supernovae.^[20]

Approximately 1% of TDEs, however, are relativistic TDEs, where anastrophysical jet is launched from the black hole shortly after the star is destroyed. This jet persists for several years before shutting off.^[21] As of 2023^[update] only four TDEs with jets have been observed.^[22]

A star gets tidally disrupted when thetidal force exerted by a black hole${\displaystyle f_{tidal}\approx \frac{2G{M}_{BH}{R}^{\ast }}{R^3}}$ exceeds theself-gravity at the surface of the star${\displaystyle f_{sg}\approx \frac{G{M}^{\ast }}{R^{\ast 2}}}$ . The distance below which${\displaystyle f_{tidal}>f_{sg}}$ is called the tidal radius and is given approximately by:^[23][24]

${\displaystyle R_T\approx R^{\ast }{\left(\frac{2M_{BH}}{M^{\ast }}\right)}^{\frac{1}{3}}}$

This is identical to theRoche limit for disruptions of solid planetary bodies.

Usually, the tidal-disruption radius of a black hole is bigger than itsSchwarzschild radius,${\displaystyle R_S=\frac{2GM}{c^2}}$, but considering the radius and mass of the star fixed there is a mass for the black hole where both radii become equal meaning that at this point the star would simply disappear before being torn apart.^[25][8]

This sectionmay containunverified orindiscriminate information inembedded lists. Please helpclean up the lists by removing items or incorporating them into the text of the article.(May 2024)

• Swift J1644+57^[26] A relativistic jet that was launched during the disruption of a star 3.8 billion light years away. The jet lasted 1.5 years, at which point it shut off.^[27]
• ASASSN-14li^[28][29] The first radio detection of a non-relativistic outflow from a TDE, in 2014.
• AT2018hyz^[30] A TDE that was radio quiet until approximately 750 days after the initial TDE event, and has been rising rapidly in radio frequencies since. This has been interpreted as a delayed radio outflow, or an off-axis jet.^[31]
• ASASSN-19bt was discovered by theAll Sky Automated Survey for SuperNovae (ASAS-SN) project, with early-time, detailed observations by theTESS satellite.^[14][32]
• AT2019qiz^[33]
• AT2022cmc^[34] is a jetted TDE discovered in 2022 by ZTF.
• AT 2022dbl is hypothesized to be a repetitive TDE, where a star has passed at least twice near asupermassive black hole and survived the first encounter, implying that perhaps at least some “standard” optical TDEs are in fact partial disruptions.^[35]
• ASASSN-20hx, located near the nucleus of galaxy NGC 6297, was discovered in July 2020 and noted that the observation represented one of the "very few tidal disruption events withhard powerlaw X-ray spectra".^[36][37]
• AT2024tvd - the first TDE that doesn't seem to be located at the center of a galaxy, but rather 2600 light years from a larger supermassive black hole at the center of the host galaxy.^[38]

• Gamma-ray burst#Tidal disruption events
• Super soft X-ray source#Large amplitude outbursts
• RX J1242-11

• The Open TDE catalog, a catalog of claimed tidal disruption events.

• Black holes
• Stellar phenomena
• Gamma-ray bursts
• Astronomical events
• Astronomical X-ray sources
• Tidal disruption events

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