Kreidberg, Laura and Luger, Rodrigo and Bedell, Megan (2019) No Evidence for Lunar Transit in New Analysis of Hubble Space Telescope Observations of the Kepler-1625 System. The Astrophysical Journal, 877 (2). L15. ISSN 2041-8213
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Abstract
Observations of the Kepler-1625 system with Kepler and the Hubble Space Telescope have suggested the presence of a candidate exomoon, Kepler-1625b I, a Neptune-radius satellite orbiting a long-period Jovian planet. Here we present a new analysis of the Hubble observations, using an independent data reduction pipeline. We find that the transit light curve is well fit with a planet-only model, with a best-fit ${\chi }_{\nu }^{2}$ equal to 1.01. The addition of a moon does not significantly improve the fit quality. We compare our results directly with the original light curve from Teachey & Kipping, and find that we obtain a better fit to the data using a model with fewer free parameters (no moon). We discuss possible sources for the discrepancy in our results, and conclude that the lunar transit signal found by Teachey & Kipping was likely an artifact of the data reduction. This finding highlights the need to develop independent pipelines to confirm results that push the limits of measurement precision.
Item Type: | Article |
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Subjects: | Open STM Article > Physics and Astronomy |
Depositing User: | Unnamed user with email support@openstmarticle.com |
Date Deposited: | 02 Jun 2023 05:53 |
Last Modified: | 23 May 2024 07:04 |
URI: | http://asian.openbookpublished.com/id/eprint/955 |