J/AJ/147/34 SpeX library of L-type dwarfs (Schneider+, 2014)
Discovery of the young L dwarf WISE J174102.78-464225.5.
Schneider A.C., Cushing M.C., Kirkpatrick J.D., Mace G.N., Gelino C.R.,
Faherty J.K., Fajardo-Acosta S., Sheppard S.S.
<Astron. J., 147, 34 (2014)>
=2014AJ....147...34S 2014AJ....147...34S
ADC_Keywords: Stars, dwarfs ; Spectral types
Keywords: brown dwarfs - stars: individual: WISE J174102.78-464225.5 -
stars: low-mass
Abstract:
We report the discovery of the L dwarf WISE J174102.78-464225.5, which
was discovered as part of a search for nearby L dwarfs using the
Wide-field Infrared Survey Explorer (WISE). The distinct triangular
peak of the H-band portion of its near-infrared spectrum and its red
near-infrared colors (J-KS=2.35±0.08mag) are indicative of a young
age. Via comparison to spectral standards and other red L dwarfs, we
estimate a near-infrared spectral type of L7±2 (pec). From a
comparison to spectral and low-mass evolutionary models, we determine
self-consistent effective temperature, logg, age, and mass values of
1450±100K, 4.0±0.25 (cm/s2), 10-100Myr, and 4-21MJup,
respectively. With an estimated distance of 10-30pc, we explore the
possibility that WISE J174102.78-464225.5 belongs to one of the young
nearby moving groups via a kinematic analysis and we find potential
membership in the β Pictoris or AB Doradus associations. A
trigonometric parallax measurement and a precise radial velocity can
help to secure its membership in either of these groups.
Description:
To extend the work of Canty et al. (2013MNRAS.435.2650C 2013MNRAS.435.2650C) into the L
dwarf regime, we gathered all available spectra from the Spex Prism
Spectral Library (maintained by Adam Burgasser at
http://pono.ucsd.edu/~adam/browndwarfs/spexprism) for which a
resolving power ≥120 is available. Since many of the given or
published spectral types were not determined homogeneously, we
independently derived near-infrared spectral types for each available
spectrum based on the Kirkpatrick et al. 2010 (J/ApJS/190/100) L dwarf
classification scheme.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 55 175 Classifications of L dwarfs in the
SpeX prism spectral library
refs.dat 63 24 References
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See also:
II/328 : AllWISE Data Release (Cutri+ 2013)
II/311 : WISE All-Sky Data Release (Cutri+ 2012)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
J/ApJ/710/1142 : SpeX spectroscopy of low mass binaries. I. (Burgasser+, 2010)
J/ApJS/190/100 : NIR proper motion survey using 2MASS (Kirkpatrick+, 2010)
J/AJ/131/2722 : New L and T dwarfs from the SDSS (Chiu+, 2006)
J/AJ/127/2856 : Brown dwarfs in the 2MASS Survey (Burgasser+, 2004)
http://pono.ucsd.edu/~adam/browndwarfs/spexprism : Spex Prism Spectral Library
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- --- [2M]
3- 11 A9 --- 2M 2MASS short name (HHMM-DDMM; J2000) (1)
13- 21 A9 --- OSpT Previously derived Optical spectral type
23- 32 A10 --- NSpT Previously derived Near-infrared spectral type
34- 37 A4 --- SSpT Newly derived infrared SpeX spectral type (2)
39- 43 F5.3 --- H2(K) [1.0/1.21]? The H2(K) index (3)
45- 46 I2 --- r_SSpT [1/23]? Reference for SpeX spectral type (4)
48- 55 A8 --- Color Spectra color (blue or red) (5)
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Note (1): 2M0310-1648, 2M0205-0795, 2M0300-2130, 2M1219-3128, and 2M0354+2540
are likely misprints for 2M0310+1648, 2M0205-0759, 2M0300+2130,
2M1219+3128, and 0345+2540, respectively (corrected at CDS).
Note (2): Each spectrum was inspected by-eye over the entire near-IR range
from 0.8 to 2.5µm.
Note (3): Canty et al. (2013MNRAS.435.2650C 2013MNRAS.435.2650C) defined an H2(K) index to
quantify the K-band continuum slope, given as:
H2(K)=[Fλ(2.17)]/[Fλ(2.24)], where
Fλ(2.17) and Fλ(2.24) are the median fluxes over a
total range of 0.02µm centered at 2.17 and 2.24µm, respectively.
Note (4): Reference to where the original near-infrared SpeX spectrum was
published.
Note (5): The spectra with blue or red near-infrared colors compared to their
best fitting spectral type are labeled as blue or red (Sl.=slightly)
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference identifier
4- 22 A19 --- BibCode Bibliographic code
24- 43 A20 --- Aut Author's name
45- 63 A19 --- Cat VizieR catalog
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History:
From electronic version of the journal
(End) Sylvain Guehenneux [CDS] 03-Sep-2014