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Multiband photometric detection of a huge flare on the M9 dwarf 2MASSW J1707183+643933
Article first published online: 13 FEB 2006
DOI: 10.1111/j.1365-2966.2006.09961.x
Issue
Monthly Notices of the Royal Astronomical Society
Volume 367, Issue 1, pages 407–411, March 2006
Additional Information
How to Cite
Rockenfeller, B., Bailer-Jones, C. A. L., Mundt, R. and Ibrahimov, M. A. (2006), Multiband photometric detection of a huge flare on the M9 dwarf 2MASSW J1707183+643933. Monthly Notices of the Royal Astronomical Society, 367: 407–411. doi: 10.1111/j.1365-2966.2006.09961.x
Publication History
- Issue published online: 7 MAR 2006
- Article first published online: 13 FEB 2006
- Accepted 2005 December 6. Received 2005 December 5; in original form 2005 October 31
- Abstract
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- References
- Cited By
Keywords:
- methods: data analysis;
- techniques: photometric;
- stars: activity;
- stars: flare;
- stars: late-type;
- stars: rotation
ABSTRACT
We present simultaneous UV, G, R and I monitoring of 19 M dwarfs that reveal a huge flare on the M9 dwarf with an amplitude in the UV of at least 6 mag. This is one of the strongest detections ever of an optical flare in an M star and one of the first in an ultracool dwarf (spectral types later than about M7). Four intermediate-strength flares (ΔmUV < 4 mag) were found in this and three other targets. For the whole sample we deduce a flare probability of 0.013 (rate of 0.022 h−1), and 0.049 (0.090 h−1) for 2M1707+64 alone. Deviations of the flare emission from a blackbody is consistent with strong Hα line emission. We also confirm our previously found rotation period for 2M1707+64 and determine it more precisely to be 3.619 ± 0.015 h.