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Superflare with massive, high-velocity prominence eruption

Date:
April 27, 2023
Source:
National Institutes of Natural Sciences
Summary:
A team of Japanese astronomers used simultaneous ground-based and space-based observations to capture a more complete picture of a superflare on a star. The observed flare started with a very massive, high-velocity prominence eruption. These results give us a better idea of how superflares and stellar prominence eruptions occur.
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A team of Japanese astronomers used simultaneous ground-based and space-based observations to capture a more complete picture of a superflare on a star. The observed flare started with a very massive, high-velocity prominence eruption. These results give us a better idea of how superflares and stellar prominence eruptions occur.

Some stars have been seen releasing superflares over 10 times larger than the largest solar flare ever seen on the Sun. The hot ionized gas released by solar flares can influence the environment around the Earth, referred to as space weather. More powerful superflares must have an even greater impact on the evolution of any planets forming around the star, or the evolution of any life forming on those planets. But the details of how superflares and prominence eruptions on stars occur have been unclear.

A team led by Shun Inoue at Kyoto University used the 3.8-m Seimei Telescope in Japan and the Transiting Exoplanet Survey Satellite (TESS) to monitor the binary star system V1355 Orionis which is known to frequently release large-scale superflares. V1355 Orionis is located 400 light years away in the constellation Orion.

The team succeeded in capturing a superflare with continuous, high temporal resolution observations. Data analysis shows that the superflare originated with a phenomenon known as a prominence eruption. Calculating the velocity of the eruption requires making some assumptions about aspects that aren't directly observably, but even the most conservative estimates far exceed the escape velocity of the star (347 km/s), indicating that the prominence eruption was capable of breaking free of the star's gravity and developing into Coronal Mass Ejections (CMEs). The prominence eruption was also one of the most massive ever observed, carrying trillions of tons of material.


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Materials provided by National Institutes of Natural Sciences. Note: Content may be edited for style and length.


Journal Reference:

  1. Shun Inoue, Hiroyuki Maehara, Yuta Notsu, Kosuke Namekata, Satoshi Honda, Keiichi Namizaki, Daisaku Nogami, Kazunari Shibata. Detection of a High-velocity Prominence Eruption Leading to a CME Associated with a Superflare on the RS CVn-type Star V1355 Orionis. The Astrophysical Journal, 2023; 948 (1): 9 DOI: 10.3847/1538-4357/acb7e8

Cite This Page:

National Institutes of Natural Sciences. "Superflare with massive, high-velocity prominence eruption." ScienceDaily. ScienceDaily, 27 April 2023. <www.sciencedaily.com/releases/2023/04/230427223227.htm>.
National Institutes of Natural Sciences. (2023, April 27). Superflare with massive, high-velocity prominence eruption. ScienceDaily. Retrieved May 27, 2024 from www.sciencedaily.com/releases/2023/04/230427223227.htm
National Institutes of Natural Sciences. "Superflare with massive, high-velocity prominence eruption." ScienceDaily. www.sciencedaily.com/releases/2023/04/230427223227.htm (accessed May 27, 2024).

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