J/A+A/689/A103 TESS 20 second cadence flare (Zhang+, 2024)
Properties of flare events based on light curves from the TESS survey.
II. 20-second cadence.
Zhang L., Yang Z., Su T., Han X.L., Misra P.
<Astron. Astrophys. 689, A103 (2024)>
=2024A&A...689A.103Z 2024A&A...689A.103Z (SIMBAD/NED BibCode)
ADC_Keywords: Stars, flare ; Optical
Keywords: stars: activity - stars: flare
Abstract:
Stellar flares are sudden bursts of energy as a result of magnetic
activity. We have used light curves from the TESS 20 second cadence
survey from 2020 to 2023 to detect flare events, and determine their
properties.
By means of repeated fitting to distinguish stellar background light
curves and flare events, we detected 32978 flare events associated with
5463 flaring stars. Furthermore, we cross-matched our samples with the
Gaia and SDSS surveys, and obtained additional stellar parameters for
determination of relationships between stellar and flare properties.
We found that the durations of 55% of the studied flares were less
than 8 minutes. Flare energies of the TESS 20 second cadence are
usually smaller than those obtained by TESS 2-min cadence data. We
identified 28425 flare events associated with4,784 flaring stars. The
relationship between flare energy and duration for both giant and main
sequence stars display a consistentV-shaped distribution. There is a
positive correlation trend on both sides with 1034erg. Stars with
lower effective temperature and mass generate more frequent flare
events. In summary, it is necessary to detect more flare events with
higher time resolution and our flare samples with 20-second cadence are
important for discovering additional new properties.
Description:
table1 compiles the specific parameters of flares in the TESS 20
second cadence light curves, along with the some stellar parameters.It
includes TESS ID, RA, DEC, the start and end time of flare, the time
of flare peak, amplitude and bolometric flare energy. Necessary
stellar parameters, such as effective temperature, spectral type, and
evolutionary stage, are also provided in the table.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 139 32978 Flare parameters of TESS 20 second cadence data
for 5471 stars
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See also:
IV/38 : TESS Input Catalog - v8.0 (TIC-8) (Stassun+, 2019)
J/A+A/669/A15 : TESS flare events and physical parameters (Yang+, 2023)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- [TIC]
5- 14 I10 --- TIC TESS ID number
16- 26 F11.7 deg RAdeg Right ascension (J2000)
28- 39 F12.8 deg DEdeg Declination (J2000)
41- 51 F11.6 d TimeS Flare begin time
53- 63 F11.6 d TimeP Flare peak time
65- 75 F11.6 d TimeE Flare end time
77- 90 F14.9 --- Amp Flare amplitude
92- 97 A6 K Teff Stellar effective temperature
99-108 A10 Rsun Rad Stellar radius
110-114 A5 Msun Mass Stellar TESS mass
116-123 A8 10-7W Ebol Flare energy
125 A1 --- SpType Stellar spectral type
127 I1 --- revol03 [0/2]?=- Stellar evolution stage
129-130 A2 --- IfEB [EB -] Single or binary star flag
132-134 A3 --- ifDiscuss [Yes No] Detailed analysis flag
136-139 I4 --- GroupID1 [1/5463] Identification number of flaring star
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Acknowledgements:
Liyun Zhang, liy_zhang(at)hotmail.com
References:
Yang et al., Paper I 2023A&A...669A..15Y 2023A&A...669A..15Y, Cat. J/A+A/669/A15
(End) Liyun Zhang [GZU, P.R. China], Patricia Vannier [CDS] 13-Jun-2024