J/AJ/168/83 Short-period variables in TESS FFI LCs (Olmschenk+, 2024)
Short-period variables in TESS Full-Frame Image light curves identified via
convolutional neural networks.
Olmschenk G., Barry R.K., Ishitani Silva S., Schnittman J.D.,
Cieplak A.M., Powell B.P., Kruse E., Barclay T., Solanki S., Ortega B.,
Baker J., Yesenia Helem Salinas M.
<Astron. J., 168, 83 (2024)>
=2024AJ....168...83O 2024AJ....168...83O
ADC_Keywords: Stars, variable; Photometry; Optical; Stars, double and multiple;
Effective temperatures; Magnitudes, absolute; Stars, masses
Keywords: Convolutional neural networks ; Neural networks ;
Delta Scuti variable stars ; Close binary stars ; Binary stars ;
Short period variable stars
Abstract:
The Transiting Exoplanet Survey Satellite (TESS) mission measured
light from stars in ∼85% of the sky throughout its 2yr primary
mission, resulting in millions of TESS 30-minute-cadence light curves
to analyze in the search for transiting exoplanets. To search this
vast data set, we aim to provide an approach that is computationally
efficient, produces accurate predictions, and minimizes the required
human search effort. We present a convolutional neural network that we
train to identify short-period variables. To make a prediction for a
given light curve, our network requires no prior target parameters
identified using other methods. Our network performs inference on a
TESS 30-minute-cadence light curve in ∼5ms on a single GPU, enabling
large-scale archival searches. We present a collection of
14156 short-period variables identified by our network. The majority
of our identified variables fall into two prominent populations, one
of close-orbit main-sequence binaries and another of δ Scuti
stars. Our neural network model and related code are additionally
provided as open-source code for public use and extension.
Description:
The TESS observatory is positioned in a high-Earth elliptical orbit of
13.7d. TESS completed its 2yr primary mission in 2020 July. While a
principle data product of TESS's primary mission is the
2-minute-cadence photometry of more than 200000 stars, of more
relevance for this work is the FFI data. During the primary mission,
at a 30-minute cadence, TESS took flux measurements of its entire
field of view (24°x96°), resulting in the FFI data set. These
FFI data include approximately 85% of the sky and observe billions of
sources.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 172 14156 *The short-period variables table
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Note on table1.dat: The Period, Partition, Fun, Over, RelAmp, and RelAmpC
column data are form this work. The remaining columns are taken from
the TESS Input Catalog (TIC), see the TIC column documentation at:
https://outerspace.stsci.edu/display/TESS/TIC+v8.2+and+CTL+v8.xx+Data+
Release+Notes (and Cat. IV/39).
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
IV/39 : TESS Input Catalog version 8.2 (TIC v8.2) (Paegert+, 2021)
J/AJ/115/1856 : Dwarf Cepheids in Carina (Mateo+, 1998)
J/A+A/528/A90 : SuperWASP short period eclipsing binaries (Norton+, 2011)
J/AJ/156/102 : TESS Input Catalog and Candidate Target List (Stassun+, 2018)
J/AJ/161/273 : 181 new planet candidates with TESS (Olmschenk+, 2021)
J/A+A/669/A48 : Southern short-per pulsating hot-subdwarf stars (Baran+, 2023)
J/ApJS/268/4 : Stellar var with TESS 2min cadence phot. (Fetherolf+, 2023)
http://archive.stsci.edu/missions-and-data/tess : TESS on MAST
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 11 I11 --- TIC [62785/10002346363] TESS Input Catalog ID
13- 20 F8.6 d Per [0.04/0.21] TESS period from this work
22- 28 F7.4 mag Tmag [4.5/16] TESS magnitude from TIC (see IV/39)
30- 35 F6.3 mag B-V [-4.2/4.6]? The (B-V) color index
37- 42 F6.3 mag Bmag [5.7/21.6]? Apparent Johnson B band magnitude
from TIC (see IV/39)
44- 49 F6.3 mag Vmag [4.7/18.4]? Apparent Johnson V band magnitude
from TIC (see IV/39)
51- 59 F9.6 mas plx [-3.72/77.3]? Parallax from TIC (see IV/39)
61- 66 F6.3 mag VMag [-8.3/15.32]? Absolute Johnson V band magnitude
68- 73 F6.2 Lsun Lum [0/128]? Stellar luminosity from TIC (see IV/39)
75- 79 I5 K Teff [2864/37600]? Stellar effective temperature
from TIC (see IV/39)
81- 86 F6.2 Rsun Rad [0.13/105]? Stellar radius from TIC (see IV/39)
88- 91 F4.2 Msun Mass [0.12/3.2]? Stellar mass from TIC (see IV/39)
93- 98 F6.3 [Sun] [M/H] [-1.8/0.6]? Stellar metallicity
from TIC (see IV/39)
100- 108 F9.3 pc Dist [12.94/45613]? Distance from TIC (see IV/39)
110- 117 E8.2 --- Cont [4.9e-07/46.2]? Contamination ratio in TESS
data from TIC (see IV/39)
119- 126 F8.6 --- RelAmp [0.00015/0.61] Relative amplitude before
contamination correction
128- 135 F8.6 --- RelAmpC [0.00027/0.98]? Relative amplitude after
contamination correction
137- 154 A18 --- Part Partition (1)
156- 163 E8.2 --- Fun [2.9e-07/0.27] Power of fundamental (2)
165- 172 E8.2 --- Over [3e-05/0.3] Power of first overtone (2)
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Note (1): The partition of the target as seen in the paper as follows:
binary = the binary partition (6563 occurrences)
deltascutiridge0 = the delta scuti primary partition (5637 occurrences)
deltascutiridge1 = the delta scuti secondary partition (1452 occurrences)
none = targets were the necessary values to determine a
partition were not available (504 occurrences)
Note (2): Of the target from an FFT with the light curve folded on twice
period in this table. See paper for detailed explanation.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 13-Nov-2024