J/MNRAS/451/2263 Differential photometry of the EB* HATS551-027 (Zhou+, 2015)
A 0.24+0.18M☉ double-lined eclipsing binary from the HATSouth survey.
Zhou G., Bayliss D., Hartman J.D., Rabus M., Bakos G.A., Jordan A.,
Brahm R., Penev K., Csubry Z., Mancini L., Espinoza N., de Val-Borro M.,
Bhatti W., Ciceri S., Henning T., Schmidt B., Murphy S.J., Butler R.P.,
Arriagada P., Shectman S., Crane J., Thompson I., Suc V., Noyes R.W.
<Mon. Not. R. Astron. Soc., 451, 2263-2277 (2015)>
=2015MNRAS.451.2263Z 2015MNRAS.451.2263Z (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, eclipsing ; Stars, dwarfs ; Stars, M-type ;
Photometry, SDSS
Keywords: binaries: eclipsing - stars: individual: HATS551-027
Abstract:
We report the discovery and characterization of a new M-dwarf binary,
with component masses and radii of M1=0.244-0.003+0.003M☉,
R1=0.261-0.009+0.006R☉, M2=0.179-0.001+0.002M☉,
R2=0.218-0.011+0.007R☉, and orbital period of ∼4.1 d. The
M-dwarf binary HATS551-027 (LP 837-20) was identified as an eclipsing
binary by the HATSouth survey, and characterized by a series of
high-precision photometric observations of the eclipse events, and
spectroscopic determinations of the atmospheric parameters and radial
velocity orbits. HATS551-027 is one of few systems with both stellar
components lying in the fully convective regime of very low mass
stars, and can serve as a test for stellar interior models. The radius
of HATS551-027A is consistent with models to 1σ, whilst
HATS551-027B is inflated by 9 percent at 2σ significance. We
measure the effective temperatures for the two stellar components to
be Teff,1=3190±100K and Teff,2=2990±110K; both are slightly
cooler than theoretical models predict, but consistent with other
M-dwarfs of similar masses that have previously been studied. We also
measure significant Hα emission from both components of the
binary system, and discuss this in the context of the correlation
between stellar activity and the discrepancies between the observed
and model temperatures.
Description:
The eclipses of HATS551-027 were first identified by observations
from the HATSouth survey (Bakos et al. 2013PASP..125..154B 2013PASP..125..154B). HATSouth
is a global network of identical, fully robotic telescopes, providing
continuous monitoring of selected 128 deg2 fields of the southern sky.
A total of 16622 observations of HATS551-027 were obtained from
HATSouth units HS-1, HS-2 in Chile, HS-3, HS-4 in Namibia, and HS-6 in
Australia from 2009 September to 2010 September.
Two secondary eclipses of HATS551-027 were observed by the Merope
camera on 2-m Faulkes Telescope South (FTS), at Siding Spring Observatory,
on 2012 December 12 and 2013 March 20. A near-complete primary eclipse
of HATS551-027 was observed by the SITe#3 camera on the Swope 1 m
telescope at Las Campanas Observatory, Chile, on 2013 February 26.
Objects:
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RA (ICRS) DE Designation(s)
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05 44 57.92 -24 56 09.6 HATS551-027 = 2MASS J05445791-2456095
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 48 10690 HATS551-027 differential photometry
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See also:
V/118 : Catalog of eclipsing binaries parameters (Perevozkina+, 1999)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d BJD Barycentric Julian Date
15- 28 F14.12 --- Flux Flux in filter
30- 36 F7.5 --- e_Flux Uncertainty in Flux
38- 45 A8 --- Inst Instrument (HATSouth, FTS, SWOPE) (1)
47- 48 A2 --- Filt [r'i'] Filter
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Note (1): For the HATSouth light curve these magnitudes have been detrended
using the External Parameter Decorrelation (EPD; Bakos et al.
2007ApJ...670..826B 2007ApJ...670..826B) and Trend Filtering Algorithm (TFA;
Kovacs, Bakos & Noyes, 2005MNRAS.356..557K 2005MNRAS.356..557K) procedures prior to
fitting a transit model to the light curve. Primarily as a result of
this detrending, but also due to blending from neighbours, the
apparent HATSouth transit depth is ∼90 per cent that of the true
depth in the Sloan r filter.
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History:
From electronic version of the journal
(End) Tiphaine Pouvreau [CDS] 15-Dec-2017