Global Analysis of the TRAPPIST Ultra-Cool Dwarf Transit Survey. (arXiv:2007.07278v1 [astro-ph.EP])
<a href="http://arxiv.org/find/astro-ph/1/au:+Lienhard_F/0/1/0/all/0/1">F. Lienhard</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Queloz_D/0/1/0/all/0/1">D. Queloz</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Gillon_M/0/1/0/all/0/1">M. Gillon</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Burdanov_A/0/1/0/all/0/1">A. Burdanov</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Delrez_L/0/1/0/all/0/1">L. Delrez</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ducrot_E/0/1/0/all/0/1">E. Ducrot</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Handley_W/0/1/0/all/0/1">W. Handley</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Jehin_E/0/1/0/all/0/1">E. Jehin</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Murray_C/0/1/0/all/0/1">C. A. Murray</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Triaud_A/0/1/0/all/0/1">A. H. M. J. Triaud</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Gillen_E/0/1/0/all/0/1">E. Gillen</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Mortier_A/0/1/0/all/0/1">A. Mortier</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Rackham_B/0/1/0/all/0/1">B. V. Rackham</a>
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 $R_oplus$ and the orbital period between 1.4 and 1.8
days.
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 $R_oplus$ and the orbital period between 1.4 and 1.8
days.
http://arxiv.org/icons/sfx.gif
