J/A+A/626/A119 EBLM J2349-32 photometry, RV and spectra (Gill+, 2019)
The EBLM project.
VI: Mass and radius of five low-mass stars in F+M binaries discovered by the
WASP survey.
Gill S., Maxted P.F.L., Evans J.A., Evans D.F., Southworth J., Smalley B.,
Gary B.L., Anderson D.R., Bouchy F., Cameron A.C., Dominik M., Faedi F.,
Gillon M., Gomez Maqueo Chew L.Hebb Y., Hellier C., Jorgensen U.G.,
Longa-Pena P., Martin D.V., McCormac J., Pepe F.V., Pollaco D., Queloz D.,
Segransan D., Snodgrass C., Turner O.D., Triaud A.H.M., Udry S., West R.G.
<Astron. Astrophys. 626, A119 (2019)>
=2019A&A...626A.119G 2019A&A...626A.119G (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, eclipsing ; Radial velocities ; Photometry ;
Spectra, optical
Keywords: binaries: eclipsing; spectroscopic - stars: low-mass -
stars: techniques: spectroscopic; photometry
Abstract:
Some M-dwarfs around F-/G-type stars have been measured to be hotter
and larger than predicted by stellar evolution models. Inconsistencies
between observations and models need to be addressed with more mass,
radius, and luminosity measurements of low-mass stars to test and
refine evolutionary models. Our aim is to measure the masses, radii
and ages of the stars in five low-mass eclipsing binary systems
discovered by the WASP survey. We used WASP photometry to establish
eclipse-time ephemerides and to obtain initial estimates for the
transit depth and width. Radial velocity measurements were
simultaneously fitted with follow-up photometry to find the
best-fitting orbital solution. This solution was combined with
measurements of atmospheric parameters to interpolate evolutionary
models and estimate the mass of the primary star, and the mass and
radius of the M-dwarf companion. We assess how the best fitting
orbital solution changes if an alternative limb-darkening law is used
and quantify the systematic effects of unresolved companions. We also
gauge how the best-fitting evolutionary model changes if different
values are used for the mixing length parameter and helium
enhancement. We report the mass and radius of five M-dwarfs and find
little evidence of inflation with respect to evolutionary models. The
primary stars in two systems are near the "blue hook" stage of
their post sequence evolution, resulting in two possible solutions for
mass and age. We find that choices in helium enhancement and
mixing-length parameter can introduce an additional 3-5% uncertainty
in measured M-dwarf mass. Unresolved companions can introduce an
additional 3-8% uncertainty in the radius of an M-dwarf, while the
choice of limb-darkening law can introduce up to an additional 2%
uncertainty. The choices in orbital fitting and evolutionary models
can introduce significant uncertainties in measurements of physical
properties of such systems.
Description:
We used the SAAO 1-m telescope in Bessel I filter to observe J2349-32.
Radial velocity measurements were obtained with CORALIE as part of
the EBLM project.
Objects:
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RA (2000) DE Designation(s)
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23 49 15.24 -32 46 17.5 EBLM J2349-32 = TYC 7519-142-1
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 74 5 List of studied stars
rv.dat 41 155 Radial velocities
saao.dat 72 929 SAAO photometry
ctio.dat 42 281 CTIO photometry
hao.dat 46 1287 HAO photometry
wasp.dat 88 47209 WASP photometry
list.dat 168 17 List of fits spectra
fits/* . 18 Individual fits spectra
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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)
J/A+A/604/L6 : EBLM J0555-57 photometry and RV (von Boetticher+, 2017)
J/A+A/625/A150 : 10 very-low-mass stars photometry (von Boetticher+, 2019)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- Name Star name
10- 11 I2 h RAh Right ascension (J2000)
13- 14 I2 min RAm Right ascension (J2000)
16- 20 F5.2 s RAs Right ascension (J2000)
22 A1 --- DE- Declination sign (J2000)
23- 24 I2 deg DEd Declination (J2000)
26- 27 I2 arcmin DEm Declination (J2000)
29- 32 F4.1 arcsec DEs Declination (J2000)
34- 38 F5.2 mag Vmag V magnitude
40- 52 A13 --- SName Simbad name
54- 55 A2 --- RV rv indicates radial velocity data in
rv.dat file
57- 60 A4 --- SAAO saao indicates photometric data in
saao.dat file
62- 65 A4 --- CTIO ctio indicates photometric data in
ctio.dat file
67- 69 A3 --- HAO hao indicates photometric data in
hao.dat file
71- 74 A4 --- WASP wasp indicates photometric data in
wasp.dat file
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Byte-by-byte Description of file: rv.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name Star name
10- 21 F12.6 d BJD Barycentric Julian date
24- 33 F10.5 km/s RV Radial velocity
35- 41 F7.5 km/s e_RV rms uncertainty on radial velocity
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Byte-by-byte Description of file: saao.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- Name Star name
10 A1 --- Band [RI] SAAO observed band
12- 29 F18.10 d BJD Barycentric Julian date
31- 49 F19.16 mag mag SAAO 1m magnitude in Band
52- 72 F21.19 mag e_mag rms uncertainty on mag
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Byte-by-byte Description of file: ctio.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- Name Star name
10 A1 --- Band [griz] CTIO observed band
12- 22 F11.6 d BJD Barycentric Julian date
25- 32 F8.5 mag mag SAAO 1m magnitude in Band
36- 42 F7.5 mag e_mag rms uncertainty on mag
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Byte-by-byte Description of file: hao.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name Star name
10- 12 A3 --- Band [CBB gz ] HAO observed band
14- 23 F10.5 d BJD Barycentric Julian date
25- 31 F7.4 mag mag SAAO 1m magnitude in Band
33- 38 F6.4 mag e_mag rms uncertainty on mag
41- 46 F6.4 mag e_mag2 Second rms uncertainty on mag
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Byte-by-byte Description of file: wasp.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- Name Star name
10- 24 F15.7 d HJD Heliocentric Julian date, TDB
26- 40 F15.7 d JD Julian date, TDB
42- 56 F15.7 d BJD Barycentirc Julian date, TDB
58- 65 F8.5 mag mag WASP magnitude
67- 74 F8.6 mag e_mag rms uncertainty on WASP magnitude
76- 86 F11.9 --- Phase Phase
88 I1 --- Field [1/7] Field number
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 8 F8.4 deg RAdeg Right Ascension of center (J2000)
9- 17 F9.5 deg DEdeg Declination of center (J2000)
19- 24 I6 --- Nx Number of pixels along X-axis
26- 44 A19 "datime" Obs.date Observation date
46- 52 F7.2 0.1nm blambda Lower value of wavelength interval
54- 60 F7.2 0.1nm Blambda Upper value of wavelength interval
62- 66 F5.3 0.1nm dlambda Wavelenght resolution
68- 71 I4 Kibyte size Size of FITS file
73-115 A43 --- FileName Name of FITS file, in subdirectory fits
116-168 A53 --- Title Title of the FITS file
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Acknowledgements:
Samuel Gill, samuel.gill(at)warwick.ac.uk
References:
Triaud et al., Paper I 2013A&A...549A..18T 2013A&A...549A..18T, Cat. J/A+A/549/A18
Gomez Maqueo Chew et al., Paper II 2014A&A...572A..50G 2014A&A...572A..50G, Cat. J/A+A/572/A50
von Boetticher et al., Paper III 2017A&A...604L...6V 2017A&A...604L...6V
Triaud et al., Paper IV 2017A&A...608A.129T 2017A&A...608A.129T
von Boetticher et al., Paper V 2019A&A...625A.150V 2019A&A...625A.150V, Cat. J/A+A/572/A50
(End) Patricia Vannier [CDS] 18-Jun-2019