Results 11 to 20 of about 2,620 (256)
Minutes-duration optical flares with supernova luminosities [PDF]
Nature, 2023 In recent years, certain luminous extragalactic optical transients have been observed to last only a few days. Their short observed duration implies a different powering mechanism from the most common luminous extragalactic transients (supernovae) whose timescale is weeks.
Yuhan Yao +2 more
exaly +10 more sources
GAMMA-RAY BURST FLARES: ULTRAVIOLET/OPTICAL FLARING. I. [PDF]
Astrophysical Journal, 2013 We present a previously unused method for the detection of flares in gamma-ray burst (GRB) light curves and use this method to detect flares in the ultraviolet/optical. The algorithm makes use of the Bayesian Information Criterion to analyze the residuals of the fitted light curve, removing all major features, and to determine the statistically best ...
Swenson, C. A. +3 more
exaly +3 more sources
OPTICAL DISCOVERY OF PROBABLE STELLAR TIDAL DISRUPTION FLARES [PDF]
Astrophysical Journal, 2011 Using archival SDSS multi-epoch imaging data (Stripe 82), we have searched for the tidal disruption of stars by super-massive black holes in non-active galaxies. Two candidate tidal disruption events (TDEs) are identified. They have optical black-body temperatures 2 10^4 K and observed peak luminosities M_g=-18.3 and -20.4; their cooling rates are very
Sjoert Van Velzen +2 more
exaly +6 more sources
Radio and Optical Flares on the dMe Flare Star EV Lac
The Astrophysical JournalWe present the results of a coordinated campaign to observe radio and optical stellar flares from the nearby M dwarf flare star EV Lac. From a total of 27 hr of radio and 29 hr of optical observations, we examine the correspondence of the action of ...
Rachel A. Osten +6 more
doaj +3 more sources
Living Reviews in Solar PhysicsMagnetic storms on stars manifest as remarkable, randomly occurring changes of the luminosity over durations that are tiny in comparison to the normal evolution of stars.
Adam F. Kowalski
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Optical properties of impulsive flares
Astrophysical Journal, Supplement Series, 1990 The optical and morphological properties of impulsive flares are examined, showing that all impulsive flares occur close to sunspots and on magnetic inversion lines with steep gradients. Impulsive flares are defined and flare brightness variations and the magnetic structure of flares are discussed.
Harold Zirin, Frances Tang
exaly +2 more sources
The Astrophysical Journal, 2023 We present a multiwavelength study of stellar flares on primarily G-type stars using overlapping time domain surveys in the near-ultraviolet (NUV) and optical regimes. The NUV (the Galaxy Evolution Explorer; GALEX) and optical (Kepler) wavelength domains
C. E. Brasseur +3 more
doaj +1 more source
LOW-POWER SOLAR FLARES OF OPTICAL AND X-RAY WAVELENGTHS FOR SOLAR CYCLES 21–24
Solar-Terrestrial Physics, 2020 Using data obtained in optical and X-ray wavelengths, we have analyzed solar flare activity for cycles 21–24. Over the last three cycles, solar activity is shown to decrease significantly.
A.V. Borovik , A.A. Zhdanov
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The Astrophysical Journal, 2023 ASASSN-14ko is a nuclear transient at the center of the AGN ESO 253−G003 that undergoes periodic flares. Optical flares were first observed in 2014 by the All-Sky Automated Survey for Supernovae (ASAS-SN) and their peak times are well-modeled with a ...
Anna V. Payne +11 more
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Dynamics of small-scale magnetic fields before small and large solar flares
Solar-Terrestrial Physics, 2023 We have examined the dynamics of the longitudinal magnetic field of active region NOAA 12673, using data from the Solar Dynamics Observatory (SDO). During the passage of the active region (AR) across the solar disk, its spots and background fields showed
Borovik A. V., Zhdanov A. A.
doaj +1 more source