Chandra Detection of an X-Ray Flare from the Brown Dwarf LP 944-20

@article{Rutledge2000ChandraDO,
  title={Chandra Detection of an X-Ray Flare from the Brown Dwarf LP 944-20},
  author={R. Rutledge and G. Basri and E. Mart{\'i}n and L. Bildsten},
  journal={The Astrophysical Journal},
  year={2000},
  volume={538}
}
We have detected a bright X-ray flare from the nearby (d = 5.0 pc) brown dwarf LP 944-20 with the Chandra Advanced CCD Imaging Spectrometer-S. This is an old (500 Myr), rapidly rotating, lithium-bearing M9 object, with a bolometric luminosity of ≈6 × 10^(29) ergs s^(-1). It was detected only by Chandra during an X-ray flare of duration 1-2 hr near the end of a 12.1 hr observation. The peak X-ray luminosity was 1.2^(+0.5)_(-0.3) × 10^(26) ergs s^(-1) in the brightest ≈550 s, corresponding to L_X… Expand

Tables from this paper

X-ray emission from a brown dwarf in the Pleiades
We report on the first detection of X-ray emission from a brown dwarf in the Pleiades, the M7-type Roque 14, obtained using the EPIC detectors on XMM‐Newton. This is the first X-ray detection of aExpand
A Chandra X-ray detection of the L dwarf binary Kelu-1 - Simultaneous Chandra and Very Large Array observations
Context. Magnetic activity in ultracool dwarfs, as measured in X-rays and Hα, shows a steep decline after spectral type M7-M8. So far, no L dwarf has been detected in X-rays. In contrast, L dwarfsExpand
X-ray detections of two young bona-fide brown dwarfs
I report the detection of two bona-fide brown dwarfs by XMM-Newton: (GY92) 141 in the ρ-Ophiuchus star-forming region and DENIS J155601-233809 in the Upper Scorpius OB association. The two objectsExpand
X-Ray-emitting Young Stars in the Orion Nebula
The Orion Nebula Cluster and the molecular cloud in its vicinity have been observed with the ACIS-I detector on board the Chandra X-ray Observatory with 23 hr exposure in two observations. We detectExpand
Chasing coronaij x-ray emission to the end of the pleiades main sequence … and beyond?
We have used a 40-ks XMM-Newton observation to examine the X-ray emission of 33 proposed M-type members in. the core of the Pleiades. We reach a limiting X-ray luminosity of LX ≈ × 1027 erg s−1 inExpand
X-ray emission from the young brown dwarfs of the Taurus Molecular Cloud
AIMS. We report the X-ray properties of young (~3 Myr) bona fide brown dwarfs (BDs) of the Taurus Molecular Cloud (TMC). METHODS. The XMM-Newton Extended Survey of the TMC (XEST) is a large programExpand
The Magnetic Properties of an L Dwarf Derived from Simultaneous Radio, X-Ray, and Hα Observations
We present the first simultaneous, multiwavelength observations of an L dwarf, the L3.5 candidate brown dwarf 2MASS J00361617+1821104, conducted with the Very Large Array, the Chandra X-RayExpand
Simultaneous optical and X-ray observations of a giant flare on the ultracool dwarf LP 412-31
Cool stars are known to produce flares probably as a result of the magnetic reconnection in their outer atmospheres. We present simultaneous XMM-Newton optical V band and X-ray observations of the M8Expand
X-ray emission from the ultracool dwarf LHS 2065
We report the results of a 68 ks long X-ray observation of the M9V ultracool dwarf star LHS 2065 with the ROSAT high resolution imager (HRI). During the observations a major X-ray flare occurred withExpand
X-Ray Detection from Bona Fide and Candidate Brown Dwarfs in the ρ Ophiuchi Cloud with Chandra
We present results of an X-ray search from bona fide and candidate brown dwarfs in the ρ Ophiuchi cloud cores with the Chandra X-ray Observatory. The selected areas are two fields near the cloudExpand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 21 REFERENCES
An X-Ray Flare Detected on the M8 Dwarf VB 10
We have detected an X-ray flare on the very low mass star VB 10 (GL 752 B; M8V) using the ROSAT High Resolution Imager. VB 10 is the latest type (lowest mass) main-sequence star known to exhibitExpand
ROSAT X-ray detection of a young brown dwarf in the chamaeleon I dark cloud
Photometry and spectroscopy of the object Cha Halpha 1, located in the Chamaeleon I star-forming cloud, show that it is a approximately 10(6)-year-old brown dwarf with spectral type M7.5 to M8 andExpand
A 2MASS Ultracool M Dwarf Observed in a Spectacular Flare
2MASSW J0149090+295613 (hereafter 2M0149) is unique among the very late M/L dwarf counterparts to Two Micron All Sky Survey (2MASS) point sources in having shown, in the first set of spectra taken onExpand
The intermediate-age brown dwarf LP 944-20
Observations are presented which show that Li I λ 6708 is detected with an equivalent width of 0.53 ± 0.05A in the proper-motion object LP 944-20 (which is also known as BRI 0337-3535). Hα isExpand
Four Nearby L Dwarfs
We present spectroscopic, photometric and astrometric observations of four bright L dwarfs identified in the course of the 2MASS near-infrared survey. Our spectroscopic data extend to wavelengthsExpand
High-resolution spectra of very low-mass stars
We present the results of high-resolution (1–0.4 A) optical spectroscopy of a sample of very low-mass stars. These data are used to examine the kinematics of the stars at the bottom of theExpand
A surprise at the bottom of the main sequence: Rapid rotation and NO H-alpha emission
We report Kech Observatory high-resolution echelle spectra from 640-850 nm for eight stars near the faint end of the main sequence. These spectra are the highest resolution spectra of such late-typeExpand
High-Energy Processes in Young Stellar Objects
▪ Abstract Observational studies of low-mass stars during their early stages of evolution, from protostars through the zero-age main sequence, show highly elevated levels of magnetic activity. ThisExpand
Stellar coronae at the end of the main sequence: A Rosat survey of the late M dwarfs
We present X-ray data, both detections and upper limits, from the ROSAT all-sky survey for most known M dwarfs later than type MS, as well as from selected ROSAT pointed observations of some of theseExpand
A Nongray Theory of Extrasolar Giant Planets and Brown Dwarfs
We present the results of a new series of nongray calculations of the atmospheres, spectra, colors, and evolution of extrasolar giant planets (EGPs) and brown dwarfs for effective temperatures belowExpand
...
1
2
3
...