J/AJ/141/78 Low-mass eclipsing binaries in KIC (Coughlin+, 2011)
Low-mass eclipsing binaries in the initial Kepler Data Release.
Coughlin J.L., Lopez-Morales M., Harrison T.E., Ule N., Hoffman D.I.
<Astron. J., 141, 78 (2011)>
=2011AJ....141...78C 2011AJ....141...78C
ADC_Keywords: Binaries, eclipsing ; Stars, masses ; Effective temperatures
Keywords: binaries: eclipsing - binaries: general -
stars: fundamental parameters - stars: late-type - stars: low-mass
Abstract:
We identify 231 objects in the newly released Cycle 0 data set from
the Kepler Mission as double-eclipse, detached eclipsing binary
systems with Teff<5500K and orbital periods shorter than ∼32 days.
We model each light curve using the JKTEBOP code with a genetic
algorithm to obtain precise values for each system. We identify 95 new
systems with both components below 1.0M☉ and eclipses of at
least 0.1mag, suitable for ground-based follow-up. Of these, 14 have
periods less than 1.0-day, 52 have periods between 1.0 and 10.0-days,
and 29 have periods greater than 10.0-days. This new sample of
main-sequence, low-mass, double-eclipse, detached eclipsing binary
candidates more than doubles the number of previously known systems
and extends the sample into the completely heretofore unexplored
P>10.0-day period regime.
Description:
The data used in our analysis consist of the 201,631 light curves made
public by the Kepler Mission7 as of 2010 June 15 from Kepler Q0 and Q1
observations. All light curves can be accessed through the
Multi-mission Archive at STScI (MAST, http://archive.stsci.edu/kepler/).
The data consist of 51,366 light curves from Kepler Q0 (observed from
2009 May 2 00:54:56 to 2009 May 11 17:51:31 UT) and 150,265 light
curves from Kepler Q1 (observed from 2009 May 13 00:15:49 to 2009 June
15 11:32:57 UT) each at 29.43 minute cadence. Individual light curves
for Q0 contain ∼470 data points and for Q1 contain ∼1600 data points.
Targets range in Kepler magnitude from 17.0 at the faintest, to 5.0 at
the brightest.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 41 7 Period, effective temperature, surface gravity,
and eclipse depth estimates for the seven new
extremely shallow eclipsing systems
table2.dat 113 231 Model system parameters via JKTEBOP for the
231 DDEBs (double-lined, detached, eclipsing
binaries) with Teff<5500K
table3.dat 52 95 Temperature, mass, and radius estimates for the
95 new LMMS (low-mass main-sequence) DDEB candidates
with amplitudes ≥0.1mag and both masses <1.0M_☉
table4.dat 62 8 Model parameters for the eight transiting
exoplanet candidates
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See also:
V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 9 I9 --- KIC Kepler identification number
11 A1 --- n_KIC [bc] Note on KIC (1)
13- 20 F8.5 d Per Period
21 A1 --- n_Per [a] Note on Per (1)
23- 26 I4 K Teff Effective temperature
28- 32 F5.3 [cm/s2] logg Surface gravity
34- 36 F3.1 % Prim Eclipse depth estimate for the primary
38- 41 F4.2 % Sec Eclipse depth estimate for the secondary
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Note (1): Notes as follows:
a = System is listed in the Kepler False Positive Catalog as likely to be an EB
b = System has non-zero eccentricity
c = Period derived assuming zero eccentricity
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 9 I9 --- KIC Kepler identification number
11- 14 I4 K Teff System effective temperature
16- 21 F6.3 mag Kpmag Apparent Kepler magnitude
23- 27 F5.3 mag Amp Magnitude range of light curve
29- 38 F10.7 d Per Period
40- 52 F13.6 d T0 Time of primary minimum; BJD-2450000
54- 58 F5.2 deg i Inclination
60- 63 F4.2 --- e Eccentricity (1)
65- 67 I3 deg omega Longitude of periastron ω (1)
69- 73 F5.3 --- rsum Sum of fractional radii
75- 83 F9.6 --- J Surface brightness ratio J=SB1/SB2
85- 91 F7.4 --- k Radii ratio k=r1/r2
93-102 F10.6 --- Lr Luminosity ratio Lr=L1/L2
104-108 F5.3 mag L1sin Amplitude of sine curve on primary (2)
110-113 F4.2 --- L3 Amount of third light
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Note (1): Although the values for e and omega are presented in this table
for ease of reading, the values of e.cos(omega) and e.sin(omega) were
actually solved for in the analysis.
Note (2): Applied to the luminosity of the primary star to account for spots.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 9 I9 --- KIC Kepler identification number
11- 17 F7.4 d Per Orbital period
19- 22 I4 K Teff System effective temperature
24- 27 I4 K T1 Primary effective temperature
29- 32 I4 K T2 Secondary effective temperature
34- 37 F4.2 Msun M1 Primary mass
39- 42 F4.2 Msun M2 Secondary mass
44- 47 F4.2 Rsun R1 Primary radius
49- 52 F4.2 Rsun R2 Secondary radius
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 9 I9 --- KIC Kepler identification number
10 A1 --- n_KIC [a] "False Positive" star (1)
12- 16 F5.2 mag Kpmag Kepler magnitude
18- 26 F9.6 d T0 Time of primary minimum; BJD-2454900
28- 36 F9.6 d Per Period
38- 41 I4 K Teff Star effective temperature
43- 47 F5.2 deg i Inclination
49- 52 F4.2 Rsun Rs Stellar radius
54- 57 F4.2 Rsun Rp Planet radius
59- 62 F4.2 Rjup Rpj Planet radius, in Jovian radius
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Note (1): Note as follows:
a = Listed in the Kepler False Positive Catalog as "velocity measurements
indicate eclipsing binary."
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 28-Jul-2012