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11 September 2020
Article (Scientific journals)
Global analysis of the TRAPPIST Ultra-Cool Dwarf Transit Survey
Lienhard, F.; Queloz, D.; Gillon, Michaël  et al.
2020 • In Monthly Notices of the Royal Astronomical Society, 497 (3), p. 3790
Peer reviewed
 

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Keywords :
atmospheric effects; techniques: photometric; planets and satellites: detection; Astrophysics - Earth and Planetary Astrophysics; Astrophysics - Instrumentation and Methods for Astrophysics; Astrophysics - Solar and Stellar Astrophysics
Abstract :
[en] 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[SUB]⊕[/SUB] and the orbital period between 1.4 and 1.8 d.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Lienhard, F.;  Cavendish Laboratory, JJ Thomson Avenue, Cambridge CB3 0HE, UK
Queloz, D.;  Cavendish Laboratory, JJ Thomson Avenue, Cambridge CB3 0HE, UK
Gillon, Michaël  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic
Burdanov, A.;  Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
Delrez, Laetitia ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic
Ducrot, Elsa ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic
Handley, W.;  Cavendish Laboratory, JJ Thomson Avenue, Cambridge CB3 0HE, UK
Jehin, Emmanuel  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Murray, C. A.;  Cavendish Laboratory, JJ Thomson Avenue, Cambridge CB3 0HE, UK
Triaud, A. H. M. J.;  School of Physics & Astronomy, University of Birmingham, Edgbaston, Birmingham B152TT, UK
Gillen, E.;  Cavendish Laboratory, JJ Thomson Avenue, Cambridge CB3 0HE, UK
Mortier, Annelies
Rackham, B. V.;  Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA)
More authors (3 more) Less
Language :
English
Title :
Global analysis of the TRAPPIST Ultra-Cool Dwarf Transit Survey
Publication date :
01 July 2020
Journal title :
Monthly Notices of the Royal Astronomical Society
ISSN :
0035-8711
eISSN :
1365-2966
Publisher :
Oxford University Press, Oxford, United Kingdom
Volume :
497
Issue :
3
Pages :
3790
Peer reviewed :
Peer reviewed

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