Robo-AO Kepler Asteroseismic Survey. I. Adaptive optics imaging of 99 asteroseismic Kepler dwarfs and subgiants

We used the Robo-AO laser adaptive optics system to image 99 main sequence and subgiant stars that have Kepler-detected asteroseismic signals. Robo-AO allows us to resolve blended secondary sources at separations as close as 0.15" that may contribute to the measured Kepler light curves and affe...

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Bibliographic Details
Published in:arXiv.org 2017-08
Main Authors: Schonhut-Stasik, Jessica S, Baranec, Christoph, Huber, Daniel, Ziegler, Carl, Atkinson, Dani, Gaidos, Eric, Law, Nicholas M, Riddle, Reed, Hagelberg, Janis, Nienke van der Marel, Hodapp, Klaus W
Format: Article
Language:English
Subjects:
Adaptive optics
Adaptive systems
Amplitudes
Dilution
Image detection
Infrared photometry
Light curve
Maximum power
Photometry
Rangefinding
Subgiant stars
Uranus
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Summary:We used the Robo-AO laser adaptive optics system to image 99 main sequence and subgiant stars that have Kepler-detected asteroseismic signals. Robo-AO allows us to resolve blended secondary sources at separations as close as 0.15" that may contribute to the measured Kepler light curves and affect asteroseismic analysis and interpretation. We report 8 new secondary sources within 4.0" of these Kepler asteroseismic stars. We used Subaru and Keck adaptive optics to measure differential infrared photometry for these candidate companion systems. Two of the secondary sources are likely foreground objects and at least 6 of the secondaries are background sources; however we cannot exclude the possibility that three of the objects may be physically associated. We measured a range of i'-band amplitude dilutions for the candidate companion systems from 0.43% to 15.4%. We find that the measured amplitude dilutions are insufficient to explain the previously identified excess scatter in the relationship between asteroseismic oscillation amplitude and the frequency of maximum power.
ISSN:2331-8422
DOI:10.48550/arxiv.1701.07841