J/A+A/604/L6 EBLM J0555-57 photometry and RV (von Boetticher+, 2017)
The EBLM Project.
III. A Saturn-size low-mass star at the hydrogen-burning limit.
von Boetticher A., Triaud A.H.M.J, Queloz D., Gill S., Lendl M., Delrez L.,
Anderson D.R., Collier Cameron A., Faedi F., Gillon M.,
Gomez Maqueo Chew Y., Hebb L., Hellier C., Jehin E., Maxted P.F.L.,
Martin D.V., Pepe F., Pollacco D., Segransan D., Smalley B., Udry S.,
West R.
<Astron. Astrophys. 604, L6 (2017)>
=2017A&A...604L...6V 2017A&A...604L...6V (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, eclipsing ; Photometry ; Radial velocities
Keywords: binaries: eclipsing - binaries: spectroscopic - stars: low mass -
techniques: spectroscopic - techniques: photometry -
stars: individual: EBLM J0555-57Ab
Abstract:
We report the discovery of an eclipsing binary system with mass-ratio
q After identifying a periodic photometric signal received by WASP, we
obtained CORALIE spectroscopic radial velocities and follow-up light
curves with the Euler and TRAPPIST telescopes. From a joint fit of
these data we determine that EBLM J0555-57 consists of a sun-like
primary star that is eclipsed by a low-mass companion, on a weakly
eccentric 7.8-day orbit. Using a mass estimate for the primary star
derived from stellar models, we determine a companion mass of
85±4MJup (0.081M☉) and a radius of 0.84+0.14-0.04RJup
(0.084R☉) that is comparable to that of Saturn. EBLM J0555-57Ab
has a surface gravity logg2=5.50+0.03-0.13 and is one of the
densest non-stellar-remnant objects currently known. These
measurements are consistent with models of low-mass stars.
Description:
The data is composed of one TRAPPIST photometric timeseries, two EULER
photometric timeseries (one large-aperture observation of A and B
components combined, one small-aperture observation of A component)
and one set of CORALIE radial velocities. They provide evidence of a
low mass star eclipsing EBLM J0555-57A.
Objects:
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RA (2000) DE Designation(s)
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05 55 32.69 -57 17 26.0 EBLM J0555-57 = 2MASS J05553262-5717261
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
coralie1.dat 86 20 CORALIE radial velocities I
coralie2.dat 63 11 CORALIE radial velocities II
eulerl.dat 64 526 Euler z band photometry, large aperture
including A and B components
eulers.dat 64 526 Euler z band photometry, small aperture
on A component
trappist.dat 230 1188 TRAPPIST z band photometry, aperture including
A and B components
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See also:
J/A+A/549/A18 : WASP-30 and J1219-39 light + velocity curves (Triaud+, 2013)
J/A+A/572/A50 : J0113+31 light + velocity curves (Gomez Maqueo Chew+, 2014)
Byte-by-byte Description of file: coralie1.dat coralie2.dat
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Bytes Format Units Label Explanations
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1- 12 F12.6 d BJD Barycentric Julian date (BJD-2400000)
14- 21 F8.5 km/s RV Radial velocity
23- 29 F7.5 km/s e_RV 1 sigma photon noise error bars on RV
31- 38 F8.5 km/s FWHM Full-width at half-maximum of
cross-correlation function
40- 45 F6.3 --- Cont Contrast of cross-correlation function
47- 54 F8.5 km/s BisSpan Span of the bisector inverse slope
56- 60 F5.3 --- pclean ?=- Probability that spectrum is NOT
contaminated by blend
62 I1 --- Rej [0/1] Spectrum rejected:
1: rejected, 0: accepted (if pclean<0.01)
64- 86 A23 --- Com Comments
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Byte-by-byte Description of file: eulerl.dat eulers.dat
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Bytes Format Units Label Explanations
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1- 11 F11.6 d HJD Heliocentric Julian Date (HJD-2450000) UTC
13- 20 F8.6 --- Flux Normalised flux
22- 29 F8.6 --- e_Flux 1 sigma error bar on the flux
31- 35 F5.2 pix xshift Centroid shift on detector
37- 41 F5.2 pix yshift Centroid shift on detector
43- 46 F4.2 --- AM Airmass
48- 52 F5.2 pix FWHM Full-width at half-maximum of centroid
54- 58 F5.2 --- Sky Sky background flux
60- 64 F5.2 s ExpTime Exposure times
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Byte-by-byte Description of file: trappist.dat
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Bytes Format Units Label Explanations
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1- 18 F18.13 d BJD Barycentric Julian Date (BJD-2450000) UTC
20- 38 F19.17 --- Flux Normalised flux
40- 62 E23.18 --- e_Flux 1 sigma error bar on the flux
64- 87 E24.17 pix xshift Centroid shift on detector
89-114 E26.19 pix yshift Centroid shift on detector
116-133 F18.16 pix FWHMx Centroid FWHM in x
135-153 F19.16 pix FWHMy Centroid FWHM in y
155-172 F18.16 pix FWHM Centroid FWHM
174-192 F19.15 --- Sky Sky background flux
194-211 F18.16 --- AM Airmass
213-230 F18.16 s ExpTime Exposure time
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Acknowledgements:
Alexander von Boetticher, av478(at)cam.ac.uk
(End) A. von Boetticher [Cavendish Laboratory], P. Vannier [CDS] 27-Jun-2017