ASASSN-19bt

ASASSN-19bt was a tidal disruption event (TDE) known for being the first such event discovered. It was discovered by the All Sky Automated Survey for SuperNovae (ASAS-SN) project, with early-time, detailed observations by the TESS satellite. It was first detected on January 21, 2019, and reached peak brightness on March 4.[1][2][3]

The black hole which caused the TDE has a mass of around 6 million suns and is in the 16th magnitude galaxy 2MASX J07001137-6602251 in the constellation Volans at a redshift of 0.0262, around 375 million light years away.[1][4]

Observations in UV light made with NASA's Neil Gehrels Swift Observatory showed a drop in the temperature of the tidal disruption from around 71,500 to 35,500 degrees Fahrenheit (40,000 to 20,000 degrees Celsius) over a few days. This is the first time such an early temperature drop has been seen in a tidal disruption event.[2] The transient resulting from the tidal disruption event has been cataloged as AT 2019ahk.[5]

## References

1. ↑ 1.0 1.1 Holoien, Thomas W.-S.; Vallely, Patrick J.; Auchettl, Katie; Stanek, K. Z.; Kochanek, Christopher S.; French, K. Decker; Prieto, Jose L.; Shappee, Benjamin J. et al. (2019). "Discovery and Early Evolution of ASASSN-19bt, the First TDE Detected by TESS". The Astrophysical Journal 883 (2): 111. doi:10.3847/1538-4357/ab3c66. Bibcode: 2019ApJ...883..111H.
2. ↑ 2.0 2.1 Garner, Rob (2019-09-25). "TESS Spots Its 1st Star-shredding Black Hole". http://www.nasa.gov/feature/goddard/2019/nasa-s-tess-mission-spots-its-1st-star-shredding-black-hole.
3. ↑ "NASA's TESS Mission Spots Its 1st Star-shredding Black Hole - NASA" (in en-US). 2019-09-26. https://www.nasa.gov/universe/nasas-tess-mission-spots-its-1st-star-shredding-black-hole/.
4. ↑ Kazmierczak, Scott Wiessinger and Jeanette (2019-09-26). "NASA Scientific Visualization Studio | TESS Catches Its First Star-destroying Black Hole" (in english). https://svs.gsfc.nasa.gov/13237.
5. ↑ Cite error: Invalid `<ref>` tag; no text was provided for refs named `2019ahk`

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