A VERY BRIGHT, VERY HOT, AND VERY LONG FLARING EVENT FROM THE M
DWARF BINARY SYSTEM DG CVn

J 2016

A VERY BRIGHT, VERY HOT, AND VERY LONG FLARING EVENT FROM THE M DWARF BINARY SYSTEM DG CVn

OSTEN, Rachel A., Adam KOWALSKI, Stephen A. DRAKE, Hans KRIMM, Kim PAGE et. al.

Basic information

Original name

A VERY BRIGHT, VERY HOT, AND VERY LONG FLARING EVENT FROM THE M DWARF BINARY SYSTEM DG CVn

Authors

OSTEN, Rachel A. (840 United States of America), Adam KOWALSKI (840 United States of America), Stephen A. DRAKE (840 United States of America), Hans KRIMM (840 United States of America), Kim PAGE (826 United Kingdom of Great Britain and Northern Ireland), Kosmas GAZEAS (300 Greece), Jamie KENNEA (840 United States of America), Samantha OATES (724 Spain), Mathew PAGE (826 United Kingdom of Great Britain and Northern Ireland), Enrique DE MIGUEL (724 Spain), Rudolf NOVÁK (203 Czech Republic, guarantor, belonging to the institution), Tomáš APELTAUER (203 Czech Republic) and Neil GEHRELS (840 United States of America)

Edition

Astrophysical Journal, BRISTOL, IOS Publishing, 2016, 0004-637X

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10308 Astronomy

Country of publisher

United Kingdom of Great Britain and Northern Ireland

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

URL

Impact factor

Impact factor: 5.533

RIV identification code

RIV/00216224:14310/16:00093551

Organization unit

Faculty of Science

DOI

http://dx.doi.org/10.3847/0004-637X/832/2/174

UT WoS

000390490100034

Keywords in English

stars: coronae; stars: flare; stars: individual (DG CVn)

Abstract

V originále

On 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 similar to 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 x 10(35) and 9 x 10(35) erg, and optical flare energies at E-V of 2.8 x 10(34) and 5.2 x 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.

Citovat

OSTEN, Rachel A., Adam KOWALSKI, Stephen A. DRAKE, Hans KRIMM, Kim PAGE, Kosmas GAZEAS, Jamie KENNEA, Samantha OATES, Mathew PAGE, Enrique DE MIGUEL, Rudolf NOVÁK, Tomáš APELTAUER and Neil GEHRELS. A VERY BRIGHT, VERY HOT, AND VERY LONG FLARING EVENT FROM THE M DWARF BINARY SYSTEM DG CVn. Astrophysical Journal. BRISTOL: IOS Publishing, 2016, vol. 832, No 2, p. "nestrankovano", 19 pp. ISSN 0004-637X. Available from: https://dx.doi.org/10.3847/0004-637X/832/2/174.

@article{1372542,
   author = {Osten, Rachel A. and Kowalski, Adam and Drake, Stephen A. and Krimm, Hans and Page, Kim and Gazeas, Kosmas and Kennea, Jamie and Oates, Samantha and Page, Mathew and de Miguel, Enrique and Novák, Rudolf and Apeltauer, Tomáš and Gehrels, Neil},
   article_location = {BRISTOL},
   article_number = {2},
   doi = {http://dx.doi.org/10.3847/0004-637X/832/2/174},
   keywords = {stars: coronae; stars: flare; stars: individual (DG CVn)},
   language = {eng},
   issn = {0004-637X},
   journal = {Astrophysical Journal},
   title = {A VERY BRIGHT, VERY HOT, AND VERY LONG FLARING EVENT FROM THE M DWARF BINARY SYSTEM DG CVn},
   url = {http://iopscience.iop.org/article/10.3847/0004-637X/832/2/174/meta;jsessionid=AB7A964C666CBD80C6B55F9810D105F7.c2.iopscience.cld.iop.org},
   volume = {832},
   year = {2016}
}

TY  - JOUR
ID  - 1372542
AU  - Osten, Rachel A. - Kowalski, Adam - Drake, Stephen A. - Krimm, Hans - Page, Kim - Gazeas, Kosmas - Kennea, Jamie - Oates, Samantha - Page, Mathew - de Miguel, Enrique - Novák, Rudolf - Apeltauer, Tomáš - Gehrels, Neil
PY  - 2016
TI  - A VERY BRIGHT, VERY HOT, AND VERY LONG FLARING EVENT FROM THE M DWARF BINARY SYSTEM DG CVn
JF  - Astrophysical Journal
VL  - 832
IS  - 2
SP  - "nestrankovano"
EP  - "nestrankovano"
PB  - IOS Publishing
SN  - 0004637X
KW  - stars: coronae
KW  - stars: flare
KW  - stars: individual (DG CVn)
UR  - http://iopscience.iop.org/article/10.3847/0004-637X/832/2/174/meta;jsessionid=AB7A964C666CBD80C6B55F9810D105F7.c2.iopscience.cld.iop.org
L2  - http://iopscience.iop.org/article/10.3847/0004-637X/832/2/174/meta;jsessionid=AB7A964C666CBD80C6B55F9810D105F7.c2.iopscience.cld.iop.org
N2  - On 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 similar to 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 x 10(35) and 9 x 10(35) erg, and optical flare energies at E-V of 2.8 x 10(34) and 5.2 x 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.
ER  -

OSTEN, Rachel A., Adam KOWALSKI, Stephen A. DRAKE, Hans KRIMM, Kim PAGE, Kosmas GAZEAS, Jamie KENNEA, Samantha OATES, Mathew PAGE, Enrique DE MIGUEL, Rudolf NOVÁK, Tomáš APELTAUER and Neil GEHRELS. A VERY BRIGHT, VERY HOT, AND VERY LONG FLARING EVENT FROM THE M DWARF BINARY SYSTEM DG CVn. \textit{Astrophysical Journal}. BRISTOL: IOS Publishing, 2016, vol.~832, No~2, p.~''nestrankovano'', 19 pp. ISSN~0004-637X. Available from: https://dx.doi.org/10.3847/0004-637X/832/2/174.

Detailed Information on Publication Record