J/ApJ/699/1196 JHKs light curves of 2MASS J05352184-0546085 (Gomez+, 2009)
Near-infrared light curves of the brown dwarf eclipsing binary
2MASS J05352184-0546085: can spots explain the temperature reversal?
Gomez Maqueo Chew Y., Stassun K.G., Prsa A., Mathieu R.D.
<Astrophys. J., 699, 1196-1208 (2009)>
=2009ApJ...699.1196G 2009ApJ...699.1196G
ADC_Keywords: Photometry, infrared ; Binaries, eclipsing ; YSOs
Keywords: binaries: eclipsing - stars: fundamental parameters - stars:
individual (2MASS J05352184-0546085) - stars: low-mass, brown dwarfs -
stars: pre-main sequence - stars: spots
Abstract:
We present near-infrared JHKS light curves for the double-lined
eclipsing binary system Two Micron All Sky Survey J05352184-0546085,
in which both components have been shown to be brown dwarfs with an
age of ∼1Myr. We analyze these light curves together with the
previously published IC-band light curve and radial velocities to
provide refined measurements of the system's physical parameters. The
component masses and radii are here determined with an accuracy of
∼6.5% and ∼1.5%, respectively. In addition, we confirm the previous
surprising finding that the primary brown dwarf has a cooler effective
temperature than its lower mass companion. Our analysis reveals two
low-amplitude (∼0.02mag) periodic signals, one attributable to the
rotation of the primary with a period of 3.293±0.001d and the other
to the rotation of the secondary with a period of 14.05±0.05d. Both
periods are consistent with the measured vsin i and radii.
Description:
The observations of 2MASS J05352184-0546085 presented in this paper
were taken in the 2MASS near-infrared bands JHKS from 2003 October
to 2006 April at Cerro Tololo Inter-American Observatory in Chile.
They were observed with the SMARTS 1.3m telescope using the ANDICAM
instrument which allows for simultaneous optical and infrared imaging
(the optical measurements have been reported in Paper I (Stassun et
al. 2006Natur.440..311S 2006Natur.440..311S) and Paper II (Stassun et al. Cat.
J/ApJ/664/1154). The integration times were typically of 490s.
Objects:
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RA (2000) DE Designation(s)
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05 35 21.8 -05 46 09 2M0535-05 = 2MASS J05352184-0546085
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 24 362 Differential J band light curve of 2M0535-05
table3.dat 24 567 Differential H band light curve of 2M0535-05
table4.dat 24 385 Differential Ks band light curve of 2M0535-05
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See also:
J/ApJ/664/1154 : Light curve of 2MASS J05352184-0546085 (Stassun+, 2007)
Byte-by-byte Description of file: table[234].dat
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Bytes Format Units Label Explanations
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1- 14 F14.6 d HJD Heliocentric Julian Date
16- 23 F8.5 mag Dmag Differential J, H or Ks band magnitude
24 A1 --- --- [0]
(table 2, table 3 or table 4 respectively)
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History:
From electronic version of the journal
References:
Stassun et al. Paper I. 2006Natur.440..311S 2006Natur.440..311S
Stassun et al. Paper II. 2007ApJ...664.1154S 2007ApJ...664.1154S Cat. J/ApJ/664/1154
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 06-Jul-2011