Probing TRAPPIST-1-like Systems with K2

Demory, Brice-Olivier; Queloz, Didier; Alibert, Yann; Gillen, Ed; Gillon, Michael (2016). Probing TRAPPIST-1-like Systems with K2. Astrophysical Journal Letters, 825(2), L25. Institute of Physics Publishing IOP 10.3847/2041-8205/825/2/L25

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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.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences
08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences > Theoretical Astrophysics and Planetary Science (TAPS)
10 Strategic Research Centers > Center for Space and Habitability (CSH)
08 Faculty of Science > Physics Institute > NCCR PlanetS

UniBE Contributor:

Alibert, Yann

Subjects:

500 Science > 520 Astronomy
600 Technology > 620 Engineering
500 Science > 530 Physics

ISSN:

2041-8205

Publisher:

Institute of Physics Publishing IOP

Language:

English

Submitter:

Yann Alibert

Date Deposited:

13 Sep 2016 09:28

Last Modified:

13 Sep 2016 09:28

Publisher DOI:

10.3847/2041-8205/825/2/L25

ArXiv ID:

arXiv:1606.08622

Uncontrolled Keywords:

planetary systems, techniques: photometric

BORIS DOI:

10.7892/boris.87764

URI:

https://boris.unibe.ch/id/eprint/87764

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