Stellar Superflares Observed Simultaneously with Kepler and XMM-Newton

@article{Kuznetsov2021StellarSO,
  title={Stellar Superflares Observed Simultaneously with Kepler and XMM-Newton},
  author={Alexey A. Kuznetsov and Dmitrii Y. Kolotkov},
  journal={The Astrophysical Journal},
  year={2021},
  volume={912}
}
Solar and stellar flares are powerful events that produce intense radiation across the electromagnetic spectrum. Multiwavelength observations are highly important for understanding the nature of flares, because different flare-related processes reveal themselves in different spectral ranges. To study the correlation between thermal and nonthermal processes in stellar flares, we have searched the databases of Kepler (optical observations) and XMM-Newton (soft X-rays) for the flares observed… 

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References

SHOWING 1-10 OF 58 REFERENCES

Simultaneous Kepler/K2 and XMM‐Newton observations of superflares in the Pleiades

Context. Flares are powerful events ignited by a sudden release of magnetic energy which triggers a cascade of interconnected phenomena, each resulting in emission in different electromagnetic bands.

Physical Processes in Magnetically Driven Flares on the Sun, Stars, and Young Stellar Objects

The first flare on the Sun was observed exactly 150 years ago. During most of the long history, only secondary effects have been noticed, so flares remained a riddle. Now the primary flare products,

A multi-wavelength view of magnetic flaring from PMS stars

Context. Flaring is an ubiquitous manifestation of magnetic activity in low mass stars including, of course, the Sun. Although flares, both from the Sun and from other stars, are most prominently

X-ray properties of active M dwarfs as observed by XMM-Newton

We present a comparative study of X-ray emission from a sample of active M dwarfs with spectral types M3.5-M4.5 using XMM-Newton observations of two single stars, AD Leonis and EV Lacertae, and two

Superflares and variability in solar-type stars with TESS in the Southern hemisphere

Superflares on solar-type stars have been a rapidly developing field ever since the launch of Kepler. Over the years, there have been several studies investigating the statistics of these explosive

Stellar Flares Observed in Long-cadence Data from the Kepler Mission

We aim to perform a statistical study of stellar flares observed by Kepler. We want to study the flare amplitude, duration, energy, and occurrence rates, and how they are related to the spectral type

Short-duration Stellar Flares in GALEX Data

We report on a population of short-duration near-ultraviolet (NUV) flares in stars observed by the Kepler and Galaxy Evolution Explorer (GALEX) missions. We analyzed the NUV light curves of 34,276

Statistical Studies of Solar White-light Flares and Comparisons with Superflares on Solar-type Stars

Recently, many superflares on solar-type stars have been discovered as white-light flares (WLFs). The statistical study found a correlation between their energies (E) and durations (τ): , similar to

Probing the origin of stellar flares on M dwarfs using TESS data sectors 1–3

Detailed studies of the Sun have shown that sunspots and solar flares are closely correlated. Photometric data from Kepler/K2 has allowed similar studies to be carried out on other stars. Here, we

Multi-wavelength observations of Proxima Centauri

Aims. We report simultaneous observations of the nearby flare star Proxima Centauri with VLT/UVES and XMM-Newton over three nights in March 2009. Our optical and X-ray observations cover the star’s
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