J/A+A/657/A31 Solar-like oscillations in Kepler DR25 SC data (Mathur+, 2022)
Detections of solar-like oscillations in dwarfs and subgiants with
Kepler DR25 short-cadence data.
Mathur S., Garcia R.A., Breton S.N., Santos A.R.G., Mosser B., Huber D.,
Sayeed M., Bugnet L., Chontos A.
<Astron. Astrophys. 657, A31 (2022)>
=2022A&A...657A..31M 2022A&A...657A..31M (SIMBAD/NED BibCode)
ADC_Keywords: Stars, dwarfs ; Stars, masses ; Stars, fundamental ; Photometry
Keywords: asteroseismology - stars: solar-type - stars: activity -
stars: rotation - stars: fundamental parameters -
methods: data analysis
Abstract:
During the survey phase of the Kepler mission, several thousand stars
were observed in short cadence, allowing for the detection of
solar-like oscillations in more than 500 main-sequence and subgiant
stars. These detections showed the power of asteroseismology in
determining fundamental stellar parameters. However, the Kepler
Science Office discovered an issue in the calibration that affected
half of the store of short-cadence data, leading to a new data release
(DR25) with corrections on the light curves. In this work, we
re-analyzed the one-month time series of the Kepler survey phase to
search for solar-like oscillations that might have been missed when
using the previous data release. We studied the seismic parameters of
99 stars, among which there are 46 targets with new reported
solar-like oscillations, increasing, by around 8%, the known sample of
solar-like stars with an asteroseismic analysis of the short-cadence
data from this mission. The majority of these stars have mid- to
high-resolution spectroscopy publicly available with the LAMOST and
APOGEE surveys, respectively, as well as precise Gaia parallaxes. We
computed the masses and radii using seismic scaling relations and we
find that this new sample features massive stars (above 1.2M☉
and up to 2M☉) and subgiants. We determined the granulation
parameters and amplitude of the modes, which agree with the scaling
relations derived for dwarfs and subgiants. The stars studied here are
slightly fainter than the previously known sample of main-sequence and
subgiants with asteroseismic detections. We also studied the surface
rotation and magnetic activity levels of those stars. Our sample of 99
stars has similar levels of activity compared to the previously known
sample and is in the same range as the Sun between the minimum and
maximum of its activity cycle. We find that for seven stars, a
possible blend could be the reason for the non-detection with the
early data release. Finally, we compared the radii obtained from the
scaling relations with the Gaia ones and we find that the Gaia radii
are overestimated by 4.4%, on average, compared to the seismic radii,
with a scatter of 12.3% and a decreasing trend according to the
evolutionary stage. In addition, for homogeneity purposes, we
re-analyzed the DR25 of the main-sequence and subgiant stars with
solar-like oscillations that were previously detected and, as a
result, we provide the global seismic parameters for a total of 525
stars.
Description:
The NASA Kepler satellite observed more than 2500 stars in short
cadence during the survey phase of the nominal mission. While more
than 500 solar-like stars had a detection of solar-like oscillations,
we report seismic detection of additional 99 stars where we analyzed
the one month of short-cadence observations from the last data release
of the mission (DR25). In this paper we present the global seismic
parameters of those stars as well as the stellar properties- namely
surface gravities, radii, and masses- obtained from seismic scaling
relations. For a subsample of stars we also provide surface rotation
periods and the level of magnetic activity.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 99 99 *Global Seismic/non-seismic parameters, stellar
table2.dat 36 525 Global Seismic parameters for the 525 stars with
previous detection of modes
levels of the stars with seismic detection
table3.dat 36 63 Rotation periods and photometric magnetic activity
properties for 99 stars
tableb1.dat 60 26 Global Seismic parameters for the candidates with
seismic detection
tablee1.dat 41 624 Global Seismic parameters for the full sample of
Kepler dwarfs and subgiants with seismic detection
--------------------------------------------------------------------------------
Note on table1.dat: One set of effective temperatures and metallicity were
derived from spectroscopy with the Apache Point Observatory for Galactic
Evolution Experiment (APOGEE, Ahumeda et al., 2020ApJS..249....3A 2020ApJS..249....3A).
Another set was obtained with the Large Sky Area Multi-ObjectFiber
Spectroscopic Telescope (LAMOST, Zong et al., 2018ApJS..238...30Z 2018ApJS..238...30Z).
The third set was obtained with the Gaia-Kepler catalog (Berger et al., 2020,
Cat. J/AJ/159/280). See Section 3.1 for further explanations.
--------------------------------------------------------------------------------
See also:
V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)
J/AJ/159/280 : Gaia-Kepler stellar properties catalog. I. KIC stars
(Berger+, 2020)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
2- 9 I8 --- KIC Kepler identifier (Cat. V/133)
12- 15 I4 K Teff [5129/6932] Effective temperature
18- 20 I3 K e_Teff Uncertainty in Teff
23- 26 F4.2 [cm/s2] logg [3.42/4.34] Surface gravity
29- 32 F4.2 [cm/s2] e_logg Uncertainty in logg
35- 39 F5.2 [-] [Fe/H] [-1.16/0.40] Metallicity
42- 45 F4.2 [-] e_[Fe/H] [0.01/0.19] Uncertainty in [Fe/H]
48- 51 I4 uHz numax [300/2500] Frequency of maximum oscillations
power
54- 56 I3 uHz e_numax Uncertainty in numax
59- 64 F6.2 uHz Dnu [22.22/119.05] Average large frequency
separation
68- 72 F5.2 uHz e_Dnu Uncertainty in Dnu
75- 78 F4.2 Msun Mass [0.57/2.58] Mass
81- 84 F4.2 Msun e_Mass Uncertainty in Mass
87- 90 F4.2 Rsun Rad [1.03/3.67] Radius
93- 96 F4.2 Rsun e_Rad Uncertainty in Rad
99 I1 [-] Flag [0/3]?=-999 Flag (1)
--------------------------------------------------------------------------------
Note (1): Provenance of the atmospheric parameters as follows:
0 = APOGEE
1 = LAMOST
2 = Kepler-Gaia Catalog
3 = Gaia DR2
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
2- 9 I8 --- KIC Kepler identifier
12- 15 I4 uHz numax [247/4119] Frequency of maximum oscillations
power
18- 20 I3 uHz e_numax Uncertainty in numax
23- 28 F6.2 uHz Dnu [17.33/172.04] Average large frequency
separation
33- 36 F4.2 uHz e_Dnu Uncertainty in Dnu
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 I8 --- KIC Kepler identifier
10- 14 F5.2 d Prot [2.15/60.42] Rotation period
16- 19 F4.2 d e_Prot Uncertainty in Prot
21- 26 F6.1 ppm Sph [9.30/5137.40] Magnetic activity proxy
28- 31 F4.1 ppm e_Sph Uncertainty in Sph
33- 36 I4 --- Flag ?=-999 CP/CB1 flag
(1 if candidate, -999 otherwise)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tableb1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
2- 9 I8 --- KIC Kepler identifier (Cat. V/133)
13- 16 I4 K Teff [5791/ 6814] Effective temperature
21- 23 I3 K e_Teff Uncertainty in Teff
27- 30 F4.2 [cm/s2] logg [3.64/4.33] Surface gravity
34- 37 F4.2 [cm/s2] e_logg Uncertainty in logg
40- 44 F5.2 [-] [Fe/H] [-0.43/0.45] Metallicity
48- 51 F4.2 [-] e_[Fe/H] [0.01/0.19] Uncertainty in [Fe/H]
54- 57 I4 uHz numax [350/2321] Frequency of maximum oscillations
power
60 I1 [-] Flag [0/3]? Flag (1)
--------------------------------------------------------------------------------
Note (1): Provenance of the atmospheric parameters as follows:
0 = APOGEE
1 = LAMOST
2 = Kepler-Gaia Catalog
3 = Gaia DR2
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tablee1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
2- 9 I8 --- KIC Kepler identifier
13- 16 I4 uHz numax [247/4119] Frequency of maximum oscillations
power
21- 23 I3 uHz e_numax Uncertainty in numax
27- 32 F6.2 uHz Dnu [17.33/172.04] Average large frequency
separation
37- 41 F5.2 uHz e_Dnu Uncertainty in Dnu
--------------------------------------------------------------------------------
Acknowledgements:
Savita Mathur, smathur(at)iac.es
(End) Savita Mathur [IAC, Spain], Patricia Vannier [CDS] 13-Dec-2021