J/MNRAS/485/5616 Red giant solar-like oscillations in Kepler data (Hon+, 2019)
A search for red giant solar-like oscillations in all Kepler data.
Hon M., Stello D., Garcia R.A., Mathur S., Sharma S., Colman I.L.,
Bugnet L.
<Mon. Not. R. Astron. Soc., 485, 5616-5630 (2019)>
=2019MNRAS.485.5616H 2019MNRAS.485.5616H (SIMBAD/NED BibCode)
ADC_Keywords: Stars, giant ; Asteroseismology ; Stars, diameters ; Optical
Keywords: asteroseismology - methods: data analysis -
techniques: image processing - stars: oscillations - stars: statistics
Abstract:
The recently published Kepler mission Data Release 25 (DR25) reported
on ∼197000 targets observed during the mission. Despite this, no wide
search for red giants showing solar-like oscillations have been made
across all stars observed in Kepler's long-cadence mode. In this work,
we perform this task using custom apertures on the Kepler pixel files
and detect oscillations in 21914 stars, representing the largest
sample of solar-like oscillating stars to date. We measure their
frequency at maximum power, νmax, down to νmax~=4µHz and
obtain log(g) estimates with a typical uncertainty below 0.05dex,
which is superior to typical measurements from spectroscopy.
Additionally, the νmax distribution of our detections show good
agreement with results from a simulated model of the Milky Way, with a
ratio of observed to predicted stars of 0.992 for stars with
10<νmax<270µHz. Among our red giant detections, we find 909 to
be dwarf/subgiant stars whose flux signal is polluted by a
neighbouring giant as a result of using larger photometric apertures
than those used by the NASA Kepler science processing pipeline. We
further find that only 293 of the polluting giants are known Kepler
targets. The remainder comprises over 600 newly identified oscillating
red giants, with many expected to belong to the Galactic halo,
serendipitously falling within the Kepler pixel files of targeted
stars.
Description:
From all 196581 Kepler stars observed in long cadence, we detected
21914 stars showing solar-like oscillations with our deep learning
classifier, yielding the current largest list of stars showing
solar-like oscillations that will provide many more targets of
interest for various asteroseismic and Galactic archaeology analyses.
We also predict νmax for each detection, which will provide
useful prior values for more precise measurements using asteroseismic
model-fitting pipelines. In addition, our νmax values provide
log(g) estimates, for which ∼88 per cent are good to within 0.05dex,
which is still superior to typical spectroscopic log(g)
determinations.
From our list of 21914 detections, we identified 21005 Kepler targets
with Gaia-derived radii representative of red giants. Even though we
do not account for giants with R≳40R☉, our number of detections
is within estimates of the total number of red giants (∼21000) as
reported by Berger et al. (2018ApJ...866...99B 2018ApJ...866...99B, Cat. J/ApJ/866/99)
(B18) because we also detect giant oscillations in stars with
R~<10R☉ that they classified as subgiants. We also found 1671
stars with R=<40R☉ that are predicted as non-detections but have
been classified as red giants by Berger et al. (2018ApJ...866...99B 2018ApJ...866...99B,
Cat. J/ApJ/866/99).
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 54 21914 Kepler long-cadence stars showing red giant
solar-like oscillations
table2.dat 31 909 A list of blended targets, each assigned with
the identity of its polluting star
tablea1.dat 15 1671 A list of Kepler targets with radii, R, smaller
than 40R☉ that are predicted to not show
giant oscillations but are classified as red
giants by Berger et al. (2018ApJ...866...99B 2018ApJ...866...99B,
Cat. J/ApJ/866/99)
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See also:
V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)
J/ApJ/866/99 : Revised radii of KIC stars & planets using Gaia DR2
(Berger+, 2018)
J/AJ/142/112 : KIC photometric calibration (Brown+, 2011)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 I8 --- KIC KIC object identifier (NNNNNNNN) (G1)
10- 16 F7.3 --- p ?=-99 Detection probability (1)
18- 24 F7.3 --- e_p ?=-99 Error on p (1)
26- 31 F6.2 uHz numax Frequency at maximum power of the star
33- 37 F5.2 uHz e_numax Error on numax
39- 44 F6.2 [cm/s2] logg ?=-99 Surface gravity (2)
46- 51 F6.2 [cm/s2] e_logg ?=-99 Error on logg (2)
53- 54 A2 --- f_KIC Flag on KIC (3)
--------------------------------------------------------------------------------
Note (1): There is no value assigned to p and e_p for false positives that have
been rectified by visual verification
Note (2): There is no value assigned to logg and e_logg for stars that have no
measured Teff from B18 (Berger et al. 2018ApJ...866...99B 2018ApJ...866...99B,
Cat. J/ApJ/866/99) or from the Kepler DR25 stellar properties
catalogue (Mathur et al. 2017ApJS..229...30M 2017ApJS..229...30M, Cat. J/ApJS/229/30)
Note (3): Flag as follows:
0 = Stars above the fiducial dwarf/giant-separating line
1 = Stars below the fiducial dwarf/giant-separating line
2 = Stars that do not have Teff and R from the Berger et al.
(2018ApJ...866...99B 2018ApJ...866...99B, Cat. J/ApJ/866/99) (B18) catalogue
M = Marginal detection
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Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 I8 --- KIC KIC object identifier (NNNNNNNN) (G1)
10- 28 I19 --- Poll ?=-99 Polluting star ID
30- 31 A2 --- f_Poll Flag on Poll (1)
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Note (1): Flag as follows:
0 = The polluting star is a Kepler target
1 = The polluting star is a non-Kepler target in the KIC
2 = The polluting star is only identified in the Gaia DR2 catalogue
(for which the 19-digit Gaia source ID is listed instead)
3 = Unidentified polluting star
M = Marginal detection
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Byte-by-byte Description of file: tablea1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 I8 --- KIC KIC object identifier (NNNNNNNN) (G1)
10- 15 F6.3 Rsun Radius Star radius adopted from the Berger et al.
(2018ApJ...866...99B 2018ApJ...866...99B, Cat. J/ApJ/866/99)
(B18) catalogue
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Global Notes:
Note (G1): Kepler input catalogue (KIC) ID (Brown et al. 2011AJ....142..112B 2011AJ....142..112B,
Cat. J/AJ/142/112)
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History:
From electronic version of the journal
(End) Ana Fiallos [CDS] 11-Oct-2022