J/AJ/164/17 GJ 1243 flares properties with Kepler and TESS (Mendoza+, 2022)
Llamaradas Estelares; Modeling the Morphology of White-light Flares.
Mendoza G.T., Davenport J.R.A., Agol E., Jackman J.A.G., Hawley S.L.
<Astron. J., 164, 17 (2022)>
=2022AJ....164...17M 2022AJ....164...17M
ADC_Keywords: Stars, M-type; Stars, flare; Optical
Keywords: M dwarf stars ; Stellar flares ; Starspots
Abstract:
Stellar variability is a limiting factor for planet detection and
characterization, particularly around active M-type stars. Here we
revisit one of the most active stars from the Kepler mission, the M4
star GJ1243, and use a sample of 414 flare events from 11 months of
1-minute cadence light curves to study the empirical morphology of
white-light stellar flares. We use a Gaussian process detrending
technique to account for the underlying starspots. We present an
improved analytic, continuous flare template that is generated by
stacking the flares onto a scaled time and amplitude and uses a Markov
Chain Monte Carlo analysis to fit the model. Our model is defined
using classical flare events but can also be used to model complex,
multipeaked flare events. We demonstrate the utility of our model
using TESS data at the 10minute, 2minute, and 20s cadence modes. Our
new flare model code is made publicly available on GitHub.
Description:
We studied the morphology of GJ1243 flares in both the Kepler and TESS
data sets. The data set of 133 flare events detected by Tansiting
Exoplanet Survey Satellite (TESS) allowed us to test our updated
analytic flare template using a new data set. We see more scatter in
the 2minute TESS sample in comparison to the 1minute Kepler data due
to cadence and signal-to-noise ratio differences but find that our
updated flare template is able to model the flares from a different
data set.
Objects:
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RA (2000) DE Designation(s)
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19 51 09.32 +46 29 00.2 GJ 1243 = G 208-42
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 79 439 Classical flare properties
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See also:
J/AJ/141/50 : White-light flares on cool stars from Kepler (Walkowicz+, 2011)
J/ApJS/207/15 : M dwarf flare spectra (Kowalski+, 2013)
J/ApJS/209/5 : Superflares of Kepler stars. I. (Shibayama+, 2013)
J/ApJS/211/9 : Variability in UV line emission of F-M stars (Loyd+, 2014)
J/ApJ/829/23 : Stellar flares from Q0-Q17 Kepler LCs (Davenport, 2016)
J/A+A/590/A11 : BVRI light curves of V374 Peg (Vida+, 2016)
J/MNRAS/474/2094 : Inferring probabilistic stellar Prot (Angus+, 2018)
J/MNRAS/483/5045 : R-band light-curve properties SN Ia (Papadogiannakis+, 2019)
J/ApJ/876/115 : Optical follow-up of ASAS-SN M dwarf flares (Schmidt+, 2019)
J/AJ/157/234 : ACRONYM. III. Candidate young low-mass stars (Schneider+, 2019)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 12 F12.7 d Tpeak [539/1736] Peak time, days
14- 24 F11.9 d FWHM [0.0002/0.02] Full time width at half the max of
the flux
26- 36 F11.9 --- Amp [0.003/0.48] Amplitude, relative units
38- 48 A11 d e_Tpeak Uncertainty in tpeak
50- 60 A11 d e_FWHM Uncertainty in FWHM
62- 72 F11.9 --- e_Amp [0.0002/0.05] Uncertainty in Amp
74- 79 A6 --- Inst Source; Kepler or TESS
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 20-Oct-2022