J/MNRAS/497/3790 TRAPPIST-South UCD Transit Survey (Lienhard+, 2020)
Global analysis of the TRAPPIST Ultra-Cool Dwarf Transit Survey.
Lienhard F., Queloz D., Gillon M., Burdanov A., Delrez L., Ducrot E.,
Handley W., Jehin E., Murray C.A., Triaud A.H.M.J., Gillen E., Mortier A.,
Rackham B.V.
<Mon. Not. R. Astron. Soc., 497, 3790-3808 (2020)>
=2020MNRAS.497.3790L 2020MNRAS.497.3790L (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Stars, M-type ; Stars, late-type ; Photometry
Keywords: atmospheric effects - techniques: photometric -
planets and satellites: detection
Abstract:
We conducted a global analysis of the TRAPPIST Ultra-Cool Dwarf
Transit Survey - a prototype of the SPECULOOS transit search conducted
with the TRAPPIST-South robotic telescope in Chile from 2011 to 2017 -
to estimate the occurrence rate of close-in planets such as
TRAPPIST-1b orbiting ultra-cool dwarfs. For this purpose, the
photometric data of 40 nearby ultra-cool dwarfs were reanalysed in a
self-consistent and fully automated manner starting from the raw
images. The pipeline developed specifically for this task generates
differential light curves, removes non-planetary photometric features
and stellar variability, and searches for transits. It identifies the
transits of TRAPPIST-1b and TRAPPIST-1c without any human
intervention. To test the pipeline and the potential output of similar
surveys, we injected planetary transits into the light curves on a
star-by-star basis and tested whether the pipeline is able to detect
them. The achieved photometric precision enables us to identify
Earth-sized planets orbiting ultra-cool dwarfs as validated by the
injection tests. Our planet-injection simulation further suggests a
lower limit of 10 per cent on the occurrence rate of planets similar
to TRAPPIST-1b with a radius between 1 and 1.3 R⊕ and the
orbital period between 1.4 and 1.8d.
Description:
We tabulate the light curves (I + z filter) of 40 nearby ultra-cool
dwarfs. The data were collected by the TRAPPIST-South telescope in
Chile from 2011 to 2017 and used to compute the estimated planet yield
depending on the occurrence rate of planets around ultra-cool dwarfs.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 63 40 Target description
table2.dat 70 234675 234675 Light curves (i-z)
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Number Target number
4- 26 A23 --- Name Target name
28- 35 F8.4 deg RAdeg Right Ascension (ICRS) at Ep=J2015
37- 44 F8.4 deg DEdeg Declination (ICRS) at Ep=J2015
46- 51 F6.3 mag Kmag Magnitude (apparent) in K filter
53- 57 F5.3 Rsun Rad Radius from Kmag
59- 63 F5.3 Msun Mass Mass from Kmag
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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- 2 I2 --- Number Target number
4- 26 A23 --- Name Target name
28- 39 F12.4 d Time Heliocentric Julian date
41- 46 F6.4 --- alc Artificial light curve
48- 58 F11.4 --- dlc Differential light curve (1)
60- 63 F4.2 --- FWHM Pixel FWHM of star
65- 70 F6.4 --- dlcc ?=0 Cleaned differential light curve (2)
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Note (1): Absolute light curves divided by artificial light curve and
decorrelated from pixel position.
Note (2): Nightly median-normalised differential light curve without flares or
cosmics. 0 if masked. Cf. Fig. 3, panel 4 in 2020MNRAS.497.3790L 2020MNRAS.497.3790L.
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Acknowledgements:
Florian Lienhard, fl386(at)cam.ac.uk
References:
Gillon M., Jehin E., Magain P., Chantry V., Hutsemekers D., Manfroid J.,
Queloz D., Udry S., 2011, EPJ Web Conf., 06002, 2011EPJWC..1106002G 2011EPJWC..1106002G
Gillon M., Jehin E., Fumel A., Magain P., Queloz D., 2013, EPJ Web Conf.,
03001, 2013EPJWC..4703001G 2013EPJWC..4703001G
(End) Patricia Vannier [CDS] 20-Aug-2021