Photometry of very bright stars with Kepler and K2 smear data
Article
Article Title | Photometry of very bright stars with Kepler and K2 smear data |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Pope, B. J. S. (Author), White, T. R. (Author), Huber, D. (Author), Murphy, S. J. (Author), Bedding, T. R. (Author), Caldwell, D. A. (Author), Sarai, A. (Author), Aigrain, S. (Author) and Barclay, T. (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 455 (1), pp. L36-L40 |
Number of Pages | 5 |
Year | 2015 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnrasl/slv143 |
Web Address (URL) | https://academic.oup.com/mnrasl/article/455/1/L36/2589594 |
Abstract | High-precision time series photometry with the Kepler satellite has been crucial to our understanding both of exoplanets, and via asteroseismology, of stellar physics. After the failure of two reaction wheels, the Kepler satellite has been repurposed as Kepler-2 (K2), observing fields close to the ecliptic plane. As these fields contain many more bright stars than the original Kepler field, K2 provides an unprecedented opportunity to study nearby objects amenable to detailed follow-up with ground-based instruments. Due to bandwidth constraints, only a small fraction of pixels can be downloaded, with the result that most bright stars which saturate the detector are not observed. We show that engineering data acquired for photometric calibration, consisting of collateral ‘smear’ measurements, can be used to reconstruct light curves for bright targets not otherwise observable with Kepler/K2. Here we present some examples from Kepler Quarter 6 and K2 Campaign 3, including the δ Scuti variables HD 178875 and 70 Aqr, and the red giant HR 8500 displaying solar-like oscillations. We compare aperture and smear photometry where possible, and also study targets not previously observed. These encouraging results suggest this new method can be applied to most Kepler and K2 fields. |
Keywords | 70 Aqr; Asteroseismology; HD 178875; Stars: individual: HR 8500; Stars: variables: general; Techniques: photometric; Astrophysics - Instrumentation and Methods for Astrophysics; Astrophysics - Earth and Planetary Astrophysics |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Byline Affiliations | University of Oxford, United Kingdom |
Georg August University of Gottingen, Germany | |
University of Sydney | |
NASA Ames Research Center, United States | |
National Aeronautics and Space Administration (NASA), United States | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q73vq/photometry-of-very-bright-stars-with-kepler-and-k2-smear-data
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