Article (Scientific journals)
Probing TRAPPIST-1-like Systems with K2
Demory, Brice-Olivier; Queloz, Didier; Alibert, Yann et al.
2016In Astrophysical Journal. Letters, 825
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Keywords :
planetary systems; techniques: photometric
Abstract :
[en] The search for small planets orbiting late M dwarfs holds the promise of detecting Earth-size planets for which their atmospheres could be characterized within the next decade. The recent discovery of TRAPPIST-1 entertains hope that these systems are common around hosts located at the bottom of the main sequence. In this Letter, we investigate the ability of the repurposed Kepler mission (K2) to probe planetary systems similar to TRAPPIST-1. We perform a consistent data analysis of 189 spectroscopically confirmed M5.5 to M9 late M dwarfs from Campaigns 1-6 to search for planet candidates and inject transit signals with properties matching TRAPPIST-1b and c. We find no transiting planet candidates across our K2 sample. Our injection tests show that K2 is able to recover both TRAPPIST-1 planets for 10% of the sample only, mainly because of the inefficient throughput at red wavelengths resulting in Poisson-limited performance for these targets. Increasing injected planetary radii to match GJ 1214b’s size yields a recovery rate of 70%. The strength of K2 is its ability to probe a large number of cool hosts across the different campaigns, out of which the recovery rate of 10% may turn into bona fide detections of TRAPPIST-1-like systems within the next two years.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Demory, Brice-Olivier ;  Astrophysics Group, Cavendish Laboratory, J.J. Thomson Avenue, Cambridge CB3 0HE, UK
Queloz, Didier ;  Astrophysics Group, Cavendish Laboratory, J.J. Thomson Avenue, Cambridge CB3 0HE, UK
Alibert, Yann;  Physikalisches Institut & Center for Space and Habitability, Universität Bern, 3012 Bern, Switzerland
Gillen, Ed ;  Astrophysics Group, Cavendish Laboratory, J.J. Thomson Avenue, Cambridge CB3 0HE, UK
Gillon, Michaël  ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Language :
English
Title :
Probing TRAPPIST-1-like Systems with K2
Publication date :
01 July 2016
Journal title :
Astrophysical Journal. Letters
ISSN :
2041-8205
eISSN :
2041-8213
Publisher :
IOP Publishing, Bristol, United Kingdom
Volume :
825
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
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