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dc.contributor.authorOsten, Rachel A.
dc.contributor.authorMiguel Agustino, Enrique de 
dc.contributor.authorGehrels, Neil
dc.identifier.citationOsten, R.A., Miguel Agustino, E., Gehrels, N.: "A Very Bright, Very Hot, and Very Long Flaring Event from the M Dwarf Binary System DG CVn". The Astrophysical Journal. Vol. 838, (2016). DOI: 10.3847/0004-637X/832/2/174en_US
dc.identifier.issn1538-4357 (electrónico)
dc.description.abstractOn 2014 April 23, the Swift satellite responded to a hard X-ray transient detected by its Burst Alert Telescope, which turned out to be a stellar flare from a nearby, young M dwarf binary DG CVn. We utilize observations at X-ray, UV, optical, and radio wavelengths to infer the properties of two large flares. The X-ray spectrum of the primary outburst can be described over the 0.3–100 keV bandpass by either a single very high-temperature plasma or a nonthermal thick-target bremsstrahlung model, and we rule out the nonthermal model based on energetic grounds. The temperatures were the highest seen spectroscopically in a stellar flare, at T ( )X( ) of 290 MK. The first event was followed by a comparably energetic event almost a day later. We constrain the photospheric area involved in each of the two flares to be >10(20) cm(2), and find evidence from flux ratios in the second event of contributions to the white light flare emission in addition to the usual hot, T ∼ 10(4) K blackbody emission seen in the impulsive phase of flares. The radiated energy in X-rays and white light reveal these events to be the two most energetic X-ray flares observed from an M dwarf, with X-ray radiated energies in the 0.3–10 keV bandpass of 4 × 10(35) and 9 × 10(35) erg, and optical flare energies at E ( )V( ) of 2.8 × 10(34) and 5.2 × 10(34) erg, respectively. The results presented here should be integrated into updated modeling of the astrophysical impact of large stellar flares on close-in exoplanetary atmospheres.en_US
dc.publisherIOP Publishingen_US
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España*
dc.subject.otherStars: coronaeen_US
dc.subject.otherStars: flareen_US
dc.subject.otherStars: individual (DG CVn)en_US
dc.titleA Very Bright, Very Hot, and Very Long Flaring Event from the M Dwarf Binary System DG CVnen_US

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