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  Photometry of K2 Campaign 9 bulge data

Poleski, R., Penny, M., Gaudi, B. S., Udalski, A., Ranc, C., Barentsen, G., et al. (2019). Photometry of K2 Campaign 9 bulge data. Astronomy and Astrophysics, 627.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0005-D004-B Version Permalink: https://hdl.handle.net/21.11116/0000-0005-D005-A
Genre: Journal Article

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https://ui.adsabs.harvard.edu/abs/2019A&A...627A..54P (Any fulltext)
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 Creators:
Poleski, R.1, Author
Penny, M.1, Author
Gaudi, B. S.1, Author
Udalski, A.1, Author
Ranc, C.1, Author
Barentsen, G.1, Author
Gould, A.1, Author
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: gravitational lensing: micro methods: observational techniques: photometric Astrophysics - Instrumentation and Methods for Astrophysics
 Abstract: In its Campaign 9, K2 observed dense regions toward the Galactic bulge in order to constrain the microlensing parallaxes and probe for free- floating planets. Photometric reduction of the K2 bulge data poses a significant challenge due to a combination of the very high stellar density, large pixels of the Kepler camera, and the pointing drift of the spacecraft. Here we present a new method to extract K2 photometry in dense stellar regions. We extended the Causal Pixel Model developed for less-crowded fields, first by using the pixel response function together with accurate astrometric grids, second by combining signals from a few pixels, and third by simultaneously fitting for an astrophysical model. We tested the method on two microlensing events and a long-period eclipsing binary. The extracted K2 photometry is an order of magnitude more precise than the photometry from other method.

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 Dates: 2019
 Publication Status: Issued
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Title: Astronomy and Astrophysics
Source Genre: Journal
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Pages: - Volume / Issue: 627 Sequence Number: - Start / End Page: - Identifier: -