J/A+A/650/A138 TRAPPIST-1 analogue stars TESS light curves (Seli+, 2021)
Activity of TRAPPIST-1 analog stars observed with TESS.
Seli B., Vida K., Moor A., Pal A., Olah K.
<Astron. Astrophys. 650, A138 (2021)>
=2021A&A...650A.138S 2021A&A...650A.138S (SIMBAD/NED BibCode)
ADC_Keywords: Stars, M-type ; Photometry ; Optical ; Stars, ages ;
Keywords: stars: activity - stars: flare - stars: late-type - stars: low-mass -
starspots - stars: statistics
Abstract:
As more exoplanets are being discovered around ultracool dwarfs,
understanding their magnetic activity - and the implications for
habitability - is of prime importance. To find stellar flares and
photometric signatures related to starspots, continuous monitoring is
necessary, which can be achieved with spaceborn observatories like the
Transiting Exoplanet Survey Satellite (TESS). We present an analysis
of TRAPPIST-1 like ultracool dwarfs with TESS full- frame image
photometry from the first two years of the primary mission. A
volume-limited sample up to 50pc is constructed consisting of 339
stars closer than 0.5mag to TRAPPIST-1 on the Gaia colour-magnitude
diagram. The 30-min cadence TESS light curves of 248 stars were
analysed, searching for flares and rotational modulation caused by
starspots. The composite flare frequency distribution of the 94
identified flares shows a power law index similar to TRAPPIST-1, and
contains flares up to ETESS=3*1033erg. Rotational periods shorter
than 5 days were determined for 42 stars, sampling the regime of fast
rotators. The ages of 88 stars from the sample were estimated using
kinematic information. A weak correlation between rotational period
and age is observed, which is consistent with magnetic braking.
Description:
We present the catalogue of TRAPPIST-1 analogue stars, and also the
additional tables with the detected rotational periods,flares, and
comoving pair candidates. The individual TESS FFI light curves are
also available, these are the final light curves after PCA detrending.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 139 339 The TRAPPIST-1 analogue sample
tablea1.dat 57 42 Rotational periods from the Lomb-Scargle analysis
tableb1.dat 90 94 Flare parameters
tablec1.dat 74 20 Comoving pair candidates from Gaia DR2
phot.dat 60 370 List of light curve files for 240 Gaia DR2
sources of table2
lc/* . 370 Individual light curves
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 19 I19 --- GaiaDR2 Gaia DR2 source_id
21- 30 I10 --- TIC ? TESS Input Catalog ID
32- 36 F5.2 mag BPmag ? Gaia BP magnitude
38- 42 F5.2 mag RPmag ? Gaia RP magnitude
44- 48 F5.2 pc Dist ? Distance
50- 53 F4.2 pc e_Dist ? Uncertainty of distance
55- 89 A35 --- TESS-Sectors Comma separated TESS sectors where the
target was observed
91- 94 F4.1 0.1nm EWHa ? Hα equivalent width
96- 99 F4.1 0.1nm e_EWHa ? Uncertainty of Hα equivalent width
101-104 F4.1 Gyr Age ? Age
106-108 F3.1 Gyr e_Age ? Uncertainty of Age
110-139 A30 --- Comm Comment on age
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 19 I19 --- GaiaDR2 Gaia DR2 source_id
21- 27 F7.5 d Per [0.1/4.92] rotational period
29- 35 F7.5 d e_Per Uncertainty of the rotational period
37- 44 E8.2 --- FAP False alarm probability
46- 49 F4.1 mmag Ampl [0.9/34.8] amplitude
51- 54 F4.1 mmag Scatter [2.8/54.1] scatter
56- 57 I2 --- Nflares [0/10] number of flares
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Byte-by-byte Description of file: tableb1.dat
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Bytes Format Units Label Explanations
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1- 19 I19 --- GaiaDR2 Gaia DR2 source_id
21- 31 F11.3 d Tpeak ? Fitted Julian time of the flare peak
33- 37 F5.3 d e_Tpeak ? Uncertainty of the fitted time of the
flare peak
39- 42 F4.1 min t12 ? Fitted half-time of the flare
44- 48 F5.1 min e_t12 ? Uncertainty of the fitted half-time of the
flare
50- 54 F5.2 --- Ampl ? Fitted amplitude of the flare
56- 59 F4.2 --- e_Ampl ? Uncertainty of the fitted amplitude of the
flare
61- 65 F5.1 min EDfit ? Equivalent duration from fitted parameters
67- 70 F4.1 min e_EDfit ? Uncertainty of the equivalent duration
from fitted parameters
72- 76 F5.1 min EDsum ? Equivalent duration from integrated flux
78- 80 F3.1 min e_EDsum ? Uncertainty of the equivalent duration
from integrated flux
82- 86 F5.1 10+34W Esum ? Flare energy in 1031erg from EDsum
88- 90 F3.1 10+34W e_Esum ? Uncertainty of the flare energy in
1031erg from EDsum
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Byte-by-byte Description of file: tablec1.dat
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Bytes Format Units Label Explanations
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1- 19 I19 --- Target Gaia DR2 source_id of the target
21- 39 I19 --- Comp Gaia DR2 source_id of the companion
41- 44 I4 AU Sep [60/9970]? Separation
46- 48 F3.1 Gyr Age ? Kinematic age
50- 52 F3.1 Gyr e_Age ? Kinematic age uncertainty
54- 74 A21 --- Comm Comment on the companion
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Byte-by-byte Description of file: phot.dat
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Bytes Format Units Label Explanations
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1- 19 I19 --- GaiaDR2 Gaia DR2 source_id
21- 22 I2 --- TESS-Sector [1/26] TESS sector
24- 60 A37 --- FileName Filename, in subdirectory lc
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Byte-by-byte Description of file: lc/*
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Bytes Format Units Label Explanations
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1- 14 F14.6 d JD Julian date
16- 25 F10.6 mag mag TESS differential magnitude
27- 35 F9.6 mag e_mag TESS magnitude uncertainty
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Acknowledgements:
Balint Seli, seli.balint(at)csfk.org
(End) Patricia Vannier [CDS] 30-Mar-2021