GALEX observations of an energetic ultraviolet flare on the dM4e star GJ 3685A

Richard D. Robinson; Jonathan M. Wheatley; Barry Y. Welsh; Karl Forster; Patrick Morrissey; Mark Seibert; R. Michael Rich; Samir Salim; Tom A. Barlow; Luciana Bianchi; Yong Ik Byun; Jose Donas; Peter G. Friedman; Timothy M. Heckman; Patrick N. Jelinsky; Young Wook Lee; Barry F. Madore; Roger F. Malina; D. Christopher Martin; Bruno Milliard; Susan G. Neff; David Schiminovich; Oswald H.W. Siegmund; Todd Small; Alex S. Szalay; Ted K. Wyder

doi:10.1086/444608

GALEX observations of an energetic ultraviolet flare on the dM4e star GJ 3685A

Richard D. Robinson, Jonathan M. Wheatley, Barry Y. Welsh, Karl Forster, Patrick Morrissey, Mark Seibert, R. Michael Rich, Samir Salim, Tom A. Barlow, Luciana Bianchi, Yong Ik Byun, Jose Donas, Peter G. Friedman, Timothy M. Heckman, Patrick N. Jelinsky, Young Wook Lee, Barry F. Madore, Roger F. Malina, D. Christopher Martin, Bruno MilliardSusan G. Neff, David Schiminovich, Oswald H.W. Siegmund, Todd Small, Alex S. Szalay, Ted K. Wyder

Research output: Contribution to journal › Article

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Abstract

The Galaxy Evolution Explorer (GALEX) satellite has obtained high time resolution ultraviolet photometry during a large flare on the M4 dwarf star GJ 3685 A. Simultaneous Near-ultraviolet (NUV, 1750-2800 Å) and Far-ultraviolet (FUV, 1350-1750 Å) time-tagged photometry with time resolution better than 0.1 s shows that the overall brightness in the FUV band increased by a factor of 1000 in 200 s. Under the assumption that the NUV emission is mostly due to a stellar continuum, and that the FUV flux is shared equally between emission lines and continuum, there is evidence for two distinct flare components for this event. The first flare type is characterized by an exponential increase in flux with little or no increase in temperature. The other involves rapid increases in both temperature and flux. While the decay time for the first flare component may be several hours, the second flare event decayed over less than 1 minute, suggesting that there was little or no confinement of the heated plasma.

Original language	English
Pages (from-to)	447-451
Number of pages	5
Journal	Astrophysical Journal
Volume	633
Issue number	1 I
DOIs	https://doi.org/10.1086/444608
Publication status	Published - 2005 Nov 1

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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Robinson, R. D., Wheatley, J. M., Welsh, B. Y., Forster, K., Morrissey, P., Seibert, M., Rich, R. M., Salim, S., Barlow, T. A., Bianchi, L., Byun, Y. I., Donas, J., Friedman, P. G., Heckman, T. M., Jelinsky, P. N., Lee, Y. W., Madore, B. F., Malina, R. F., Martin, D. C., ... Wyder, T. K. (2005). GALEX observations of an energetic ultraviolet flare on the dM4e star GJ 3685A. Astrophysical Journal, 633(1 I), 447-451. https://doi.org/10.1086/444608

Robinson, Richard D. ; Wheatley, Jonathan M. ; Welsh, Barry Y. ; Forster, Karl ; Morrissey, Patrick ; Seibert, Mark ; Rich, R. Michael ; Salim, Samir ; Barlow, Tom A. ; Bianchi, Luciana ; Byun, Yong Ik ; Donas, Jose ; Friedman, Peter G. ; Heckman, Timothy M. ; Jelinsky, Patrick N. ; Lee, Young Wook ; Madore, Barry F. ; Malina, Roger F. ; Martin, D. Christopher ; Milliard, Bruno ; Neff, Susan G. ; Schiminovich, David ; Siegmund, Oswald H.W. ; Small, Todd ; Szalay, Alex S. ; Wyder, Ted K. / GALEX observations of an energetic ultraviolet flare on the dM4e star GJ 3685A. In: Astrophysical Journal. 2005 ; Vol. 633, No. 1 I. pp. 447-451.

@article{36eb8b2d42a24e6a8c6f9e0f396deb52,

title = "GALEX observations of an energetic ultraviolet flare on the dM4e star GJ 3685A",

abstract = "The Galaxy Evolution Explorer (GALEX) satellite has obtained high time resolution ultraviolet photometry during a large flare on the M4 dwarf star GJ 3685 A. Simultaneous Near-ultraviolet (NUV, 1750-2800 {\AA}) and Far-ultraviolet (FUV, 1350-1750 {\AA}) time-tagged photometry with time resolution better than 0.1 s shows that the overall brightness in the FUV band increased by a factor of 1000 in 200 s. Under the assumption that the NUV emission is mostly due to a stellar continuum, and that the FUV flux is shared equally between emission lines and continuum, there is evidence for two distinct flare components for this event. The first flare type is characterized by an exponential increase in flux with little or no increase in temperature. The other involves rapid increases in both temperature and flux. While the decay time for the first flare component may be several hours, the second flare event decayed over less than 1 minute, suggesting that there was little or no confinement of the heated plasma.",

author = "Robinson, {Richard D.} and Wheatley, {Jonathan M.} and Welsh, {Barry Y.} and Karl Forster and Patrick Morrissey and Mark Seibert and Rich, {R. Michael} and Samir Salim and Barlow, {Tom A.} and Luciana Bianchi and Byun, {Yong Ik} and Jose Donas and Friedman, {Peter G.} and Heckman, {Timothy M.} and Jelinsky, {Patrick N.} and Lee, {Young Wook} and Madore, {Barry F.} and Malina, {Roger F.} and Martin, {D. Christopher} and Bruno Milliard and Neff, {Susan G.} and David Schiminovich and Siegmund, {Oswald H.W.} and Todd Small and Szalay, {Alex S.} and Wyder, {Ted K.}",

year = "2005",

month = nov,

day = "1",

doi = "10.1086/444608",

language = "English",

volume = "633",

pages = "447--451",

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Robinson, RD, Wheatley, JM, Welsh, BY, Forster, K, Morrissey, P, Seibert, M, Rich, RM, Salim, S, Barlow, TA, Bianchi, L, Byun, YI, Donas, J, Friedman, PG, Heckman, TM, Jelinsky, PN, Lee, YW, Madore, BF, Malina, RF, Martin, DC, Milliard, B, Neff, SG, Schiminovich, D, Siegmund, OHW, Small, T, Szalay, AS & Wyder, TK 2005, 'GALEX observations of an energetic ultraviolet flare on the dM4e star GJ 3685A', Astrophysical Journal, vol. 633, no. 1 I, pp. 447-451. https://doi.org/10.1086/444608

GALEX observations of an energetic ultraviolet flare on the dM4e star GJ 3685A. / Robinson, Richard D.; Wheatley, Jonathan M.; Welsh, Barry Y.; Forster, Karl; Morrissey, Patrick; Seibert, Mark; Rich, R. Michael; Salim, Samir; Barlow, Tom A.; Bianchi, Luciana; Byun, Yong Ik; Donas, Jose; Friedman, Peter G.; Heckman, Timothy M.; Jelinsky, Patrick N.; Lee, Young Wook; Madore, Barry F.; Malina, Roger F.; Martin, D. Christopher; Milliard, Bruno; Neff, Susan G.; Schiminovich, David; Siegmund, Oswald H.W.; Small, Todd; Szalay, Alex S.; Wyder, Ted K.

In: Astrophysical Journal, Vol. 633, No. 1 I, 01.11.2005, p. 447-451.

Research output: Contribution to journal › Article

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T1 - GALEX observations of an energetic ultraviolet flare on the dM4e star GJ 3685A

AU - Robinson, Richard D.

AU - Wheatley, Jonathan M.

AU - Welsh, Barry Y.

AU - Forster, Karl

AU - Morrissey, Patrick

AU - Seibert, Mark

AU - Rich, R. Michael

AU - Salim, Samir

AU - Barlow, Tom A.

AU - Bianchi, Luciana

AU - Byun, Yong Ik

AU - Donas, Jose

AU - Friedman, Peter G.

AU - Heckman, Timothy M.

AU - Jelinsky, Patrick N.

AU - Lee, Young Wook

AU - Madore, Barry F.

AU - Malina, Roger F.

AU - Martin, D. Christopher

AU - Milliard, Bruno

AU - Neff, Susan G.

AU - Schiminovich, David

AU - Siegmund, Oswald H.W.

AU - Small, Todd

AU - Szalay, Alex S.

AU - Wyder, Ted K.

PY - 2005/11/1

Y1 - 2005/11/1

N2 - The Galaxy Evolution Explorer (GALEX) satellite has obtained high time resolution ultraviolet photometry during a large flare on the M4 dwarf star GJ 3685 A. Simultaneous Near-ultraviolet (NUV, 1750-2800 Å) and Far-ultraviolet (FUV, 1350-1750 Å) time-tagged photometry with time resolution better than 0.1 s shows that the overall brightness in the FUV band increased by a factor of 1000 in 200 s. Under the assumption that the NUV emission is mostly due to a stellar continuum, and that the FUV flux is shared equally between emission lines and continuum, there is evidence for two distinct flare components for this event. The first flare type is characterized by an exponential increase in flux with little or no increase in temperature. The other involves rapid increases in both temperature and flux. While the decay time for the first flare component may be several hours, the second flare event decayed over less than 1 minute, suggesting that there was little or no confinement of the heated plasma.

AB - The Galaxy Evolution Explorer (GALEX) satellite has obtained high time resolution ultraviolet photometry during a large flare on the M4 dwarf star GJ 3685 A. Simultaneous Near-ultraviolet (NUV, 1750-2800 Å) and Far-ultraviolet (FUV, 1350-1750 Å) time-tagged photometry with time resolution better than 0.1 s shows that the overall brightness in the FUV band increased by a factor of 1000 in 200 s. Under the assumption that the NUV emission is mostly due to a stellar continuum, and that the FUV flux is shared equally between emission lines and continuum, there is evidence for two distinct flare components for this event. The first flare type is characterized by an exponential increase in flux with little or no increase in temperature. The other involves rapid increases in both temperature and flux. While the decay time for the first flare component may be several hours, the second flare event decayed over less than 1 minute, suggesting that there was little or no confinement of the heated plasma.

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