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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 (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). 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: ------------------------------------------------------------------ RA (ICRS) DE Designation(s) ------------------------------------------------------------------ 05 44 57.92 -24 56 09.6 HATS551-027 = 2MASS J05445791-2456095 ------------------------------------------------------------------ File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 48 10690 HATS551-027 differential photometry
See also: V/118 : Catalog of eclipsing binaries parameters (Perevozkina+, 1999) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
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
Note (1): For the HATSouth light curve these magnitudes have been detrended using the External Parameter Decorrelation (EPD; Bakos et al. 2007ApJ...670..826B) and Trend Filtering Algorithm (TFA; Kovacs, Bakos & Noyes, 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.
History: From electronic version of the journal
(End) Tiphaine Pouvreau [CDS] 15-Dec-2017
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