J/A+A/669/A15 TESS flare events and physical parameters (Yang+, 2023)
Properties of flare events based on the light curve of TESS survey.
Yang Z., Zhang L., Meng G., Han X.L., Misra P., Yang J., Pi Q.
<Astron. Astrophys. 669, A15 (2023)>
=2023A&A...669A..15Y 2023A&A...669A..15Y (SIMBAD/NED BibCode)
ADC_Keywords: Stars, flare ; Photometry, SDSS
Keywords: stars: activity - stars: flare - stars: statistics
Abstract:
A stellar flare is a strong energy burst event. Understanding stellar
flare is important for determining the properties of stellar magnetic
activities. We aim to perform statistical analyses on stellar flare
characteristics of different stellar parameters in greater details by
using the light curves of TESS survey from July 2018 to October 2020.
By using repeated fitting to difference stellar background light curve
and flare event, we precisely detected 60810 flare events on 13478
stars from 1-30 sectors of TESS data and determined the flare
parameters. After cross-matching our samples with Gaia survey, we
obtained more stellar parameters to determine the relationship between
the flare parameters and stellar parameters.
The fractions of flare stars decrease as stellar temperatures increase
in the region 2500-6500K and stellar mass from 0.08 to 1.4M☉.
The flare energies increase as the stellar temperature and the stellar
mass decrease. There is a weak relationship between the flare
amplitude and Ro. We also confirmed that M-type stars produce flares
more frequently than FGK stars. We updated the proportion of flare
stars increases from M0 to M5, and decreases from M5 to M7. We
obtained the power-law index (1.83-0.15) of the cumulative flare
frequency distribution. The index shows a decreasing trend from F to K
type stars, and M-type stars rise for dwarf samples. The fraction of
flare stars decreased as the vertical absolute height increases in
0-200pc and stable in 200-800pc. We found that eclipsing binary
stars more frequent flare than single stars.
Description:
File table1 contains the parameters of 60810 flare events. It
includes TESS ID, the start and end time of flare, the time of flare
peak, duration and flare amplitude.
File table2 contains all targets' stellar parameters observed in 1-30
sectors of TESS mission, such as the effective temperature, stellar
radius and mass.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 101 60810 Parameters of all flare events in our sample
table2.dat 172 264670 Stellar parameters of all targets observed by
TESS in its 1-30 sectors
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See also:
IV/38 : TESS Input Catalog - v8.0 (TIC-8) (Stassun+, 2019)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- [TIC]
5- 14 I10 --- TIC TESS identification number
16- 26 F11.6 d TimeS Flare start time
28- 38 F11.6 d TimeP Flare peak moment
40- 50 F11.6 d TimeE Flare end time
52- 59 F8.6 d Dur Flare event's duration
61- 71 F11.8 --- Amp Amplitude of flare peak
73- 78 F6.1 K Teff ?=- Effective temperature of flare star
80- 86 F7.3 Rsun Rad ?=- Radius of flare star
88- 95 E8.2 10-7J E ?=- Energy released by flare event
97-101 I5 --- Num1 Order number of the star under the standards
we defined
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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- 3 A3 --- --- [TIC]
5- 15 I11 --- TIC TESS identification number
17- 22 F6.2 deg RAdeg Right ascension (J2000)
24- 33 F10.6 deg DEdeg Declination (J2000)
35- 43 F9.3 mas/yr pmRA ?=- Proper motion in right ascension
45- 53 F9.3 mas/yr pmDE ?=- Proper motion in declination
55- 61 F7.1 K Teff ?=- Effective temperature
63- 71 F9.6 [cm/s2] logg ?=- Log surface gravity
73- 83 F11.6 Rsun Rad ?=- Stellar radius
85- 89 F5.3 Msun Mass ?=- Stellar massive
91- 96 F6.3 mag umag ?=- u band magnitude
98-103 F6.3 mag gmag ?=- g band magnitude
105-110 F6.3 mag rmag ?=- r band magnitude
112-117 F6.3 mag imag ?=- i band magnitude
119-124 F6.3 mag zmag ?=- z band magnitude
126-134 F9.3 pc DistT ?=- Distance given by TESS
136-142 F7.2 km/s RV ?=- Radial velocity
144-155 F12.6 pc DistG ?=- Distance given by Gaia
157-159 A3 --- Flare [Yes No] Whether has flare event
161-163 I3 --- Nct ?=- The counts of flare events
165-170 I6 --- Num2 Order number of the star under the standards
we defined
172 I1 --- NTESS [1/4] Counts of TESS ID owned by this star
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Acknowledgements:
Yang Zilu, liy_zhang(at)hotmail.com
(End) Yang Zilu [GZU, P.R. China], Patricia Vannier [CDS] 05-Oct-2022