Coronal X-ray emission from an intermediate-age brown dwarf

Yohko Tsuboi, Yoshitomo Maeda, Eric D. Feigelson, Gordon P. Garmire, George Chartas, Koji Mori, Steven H. Pravdo

Research output: Contribution to journalArticle

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Abstract

We report the X-ray detection of the brown dwarf (BD) companion TWA 5B in an ≃ 12 Myr old pre-main-sequence binary system. We clearly resolve the faint companion (35 photons) separated from the X-ray luminous primary by 2″ in a Chandra ACIS image. TWA 5B shows a soft X-ray spectrum with a low plasma temperature of only 0.3 keV and a constant flux during the 3 hr observation, of which the characteristics are commonly seen in the solar corona. The X-ray luminosity is 4 × 1027 ergs s-1 (0.1-10 keV band) or log (Lx/Lbol) = -3.4, Comparing these properties to both younger and older BDs, we discuss the evolution of the X-ray emission in BDs. During their first few megayears, they exhibit high levels of X-ray activity, as seen in higher mass pre-main-sequence stars. The level in TWA 5B is still high at t ≃ 12 Myr in log Lx/Lbol, while kT has already substantially cooled.

Original languageEnglish (US)
Pages (from-to)L51-L54
JournalAstrophysical Journal
Volume587
Issue number1 II
DOIs
StatePublished - Apr 10 2003

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x rays
pre-main sequence stars
solar corona
cold plasmas
erg
corona
luminosity
plasma
photons
temperature
detection
young

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Tsuboi, Y., Maeda, Y., Feigelson, E. D., Garmire, G. P., Chartas, G., Mori, K., & Pravdo, S. H. (2003). Coronal X-ray emission from an intermediate-age brown dwarf. Astrophysical Journal, 587(1 II), L51-L54. https://doi.org/10.1086/375017
Tsuboi, Yohko ; Maeda, Yoshitomo ; Feigelson, Eric D. ; Garmire, Gordon P. ; Chartas, George ; Mori, Koji ; Pravdo, Steven H. / Coronal X-ray emission from an intermediate-age brown dwarf. In: Astrophysical Journal. 2003 ; Vol. 587, No. 1 II. pp. L51-L54.
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Tsuboi, Y, Maeda, Y, Feigelson, ED, Garmire, GP, Chartas, G, Mori, K & Pravdo, SH 2003, 'Coronal X-ray emission from an intermediate-age brown dwarf', Astrophysical Journal, vol. 587, no. 1 II, pp. L51-L54. https://doi.org/10.1086/375017

Coronal X-ray emission from an intermediate-age brown dwarf. / Tsuboi, Yohko; Maeda, Yoshitomo; Feigelson, Eric D.; Garmire, Gordon P.; Chartas, George; Mori, Koji; Pravdo, Steven H.

In: Astrophysical Journal, Vol. 587, No. 1 II, 10.04.2003, p. L51-L54.

Research output: Contribution to journalArticle

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AU - Maeda, Yoshitomo

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AU - Chartas, George

AU - Mori, Koji

AU - Pravdo, Steven H.

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Tsuboi Y, Maeda Y, Feigelson ED, Garmire GP, Chartas G, Mori K et al. Coronal X-ray emission from an intermediate-age brown dwarf. Astrophysical Journal. 2003 Apr 10;587(1 II):L51-L54. https://doi.org/10.1086/375017