J/ApJ/812/46 Transit metric for Q1-Q17 Kepler candidates (Thompson+, 2015)
A machine learning technique to identify transit shaped signals.
Thompson S.E., Mullally F., Coughlin J., Christiansen J.L., Henze C.E.,
Haas M.R., Burke C.J.
<Astrophys. J., 812, 46 (2015)>
=2015ApJ...812...46T 2015ApJ...812...46T (SIMBAD/NED BibCode)
ADC_Keywords: Planets ; Stars, double and multiple
Keywords: binaries: eclipsing; methods: data analysis; planetary systems
Abstract:
We describe a new metric that uses machine learning to determine if a
periodic signal found in a photometric time series appears to be
shaped like the signature of a transiting exoplanet. This metric uses
dimensionality reduction and k-nearest neighbors to determine whether
a given signal is sufficiently similar to known transits in the same
data set. This metric is being used by the Kepler Robovetter to
determine which signals should be part of the Q1-Q17 DR24 catalog of
planetary candidates. The Kepler Mission reports roughly 20000
potential transiting signals with each run of its pipeline, yet only a
few thousand appear to be sufficiently transit shaped to be part of
the catalog. The other signals tend to be variable stars and
instrumental noise. With this metric, we are able to remove more than
90% of the non-transiting signals while retaining more than 99% of the
known planet candidates. When tested with injected transits, less than
1% are lost. This metric will enable the Kepler mission and future
missions looking for transiting planets to rapidly and consistently
find the best planetary candidates for follow-up and cataloging.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 64 20366 Locality Preserving Projections (LPP) transit
metric for DR24 (Seader+, 2015, J/ApJS/217/18)
Threshold Crossing Events (TCEs)
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See also:
V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)
J/ApJ/810/95 : Kepler pipeline S/N studies. II. 2011 (Christiansen+, 2015)
J/ApJ/809/8 : Terrestrial planet occurrence rates for KOIs (Burke+, 2015)
J/ApJ/807/45 : Potentially habitable planets around M dwarfs (Dressing+, 2015)
J/ApJS/217/31 : Kepler planetary candidates. VI. 4yr Q1-Q16 (Mullally+, 2015)
J/ApJS/217/18 : Potential transit signals in Kepler Q1-Q17 (Seader+, 2015)
J/ApJS/217/16 : Kepler planetary candidates. V. 3yr Q1-Q12 (Rowe+, 2015)
J/ApJS/210/19 : Kepler planetary candidates. IV. 22 months (Burke+, 2014)
J/ApJS/207/35 : Kepler pipeline signal-to-noise studies (Christiansen+, 2013)
J/ApJS/204/24 : Kepler planetary candidates. III. (Batalha+, 2013)
J/ApJS/199/24 : The first three quarters of Kepler mission (Tenenbaum+, 2012)
J/AJ/142/160 : Kepler Mission. II. eclipsing binaries (Slawson+, 2011)
J/AJ/142/112 : KIC photometric calibration (Brown+, 2011)
J/ApJ/736/19 : Kepler planetary candidates. II. (Borucki+, 2011)
J/AJ/141/83 : Eclipsing binaries in Kepler first data release (Prsa+, 2011)
J/ApJ/728/117 : Kepler planetary candidates. I. (Borucki+, 2011)
http://exoplanetarchive.ipac.caltech.edu/ : NASA exoplanet archive
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 I8 --- KIC KIC number (1)
9 A1 --- --- [-]
10- 11 I2 --- Pl Planet number (1)
13- 21 F9.5 d Per TCE period (2)
23- 27 F5.2 h Dur TCE transit duration (2)
29- 40 F12.1 --- MES TCE multiple-event statistic
42- 49 F8.6 --- DVmed LPP transit metric calculated using the
DV-median detrended light curve
51- 58 F8.6 --- pLS LPP transit metric calculated using the
penalized-LS detrended light curve
60- 64 A5 --- Label Label (3)
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Note (1): The TCE name is in the format of KIC number and planet number
separated by a hyphen.
Note (2): The TCE period and duration are given for reference, see the NExScI
TCE table for full precision of these values.
Note (3): Used for training and testing the metric. The labels can be
interpreted with the following key:
TL = transit-like;
C = candidate;
SS = significant secondary;
NOT = not-transit-like (1039 events);
UNK = unknown (13649 events).
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 03-Feb-2016