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Robo-AO Kepler Asteroseismic Survey. I. Adaptive Optics Imaging of 99 Asteroseismic Kepler Dwarfs and Subgiants

Schonhut-Stasik, Jessica S. and Baranec, Christoph and Huber, Daniel and Ziegler, Carl and Atkinson, Dani and Gaidos, Eric and Law, Nicholas M. and Riddle, Reed and Hagelberg, Janis and van der Marel, Nienke and Hodapp, Klaus W. (2017) Robo-AO Kepler Asteroseismic Survey. I. Adaptive Optics Imaging of 99 Asteroseismic Kepler Dwarfs and Subgiants. Astrophysical Journal, 847 (2). Art. No. 97. ISSN 1538-4357. http://resolver.caltech.edu/CaltechAUTHORS:20170926-111646660

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Abstract

We used the Robo-AO laser adaptive optics (AOs) 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 eight new secondary sources within 4.”0 of these Kepler asteroseismic stars. We used Subaru and Keck AOs to measure differential infrared photometry for these candidate companion systems. Two of the secondary sources are likely foreground objects, while the remaining six 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.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.3847/1538-4357/aa886fDOIArticle
http://iopscience.iop.org/article/10.3847/1538-4357/aa886f/metaPublisherArticle
https://arxiv.org/abs/1701.07841arXivDiscussion Paper
ORCID:
AuthorORCID
Schonhut-Stasik, Jessica S.0000-0002-1043-8853
Baranec, Christoph0000-0002-1917-9157
Huber, Daniel0000-0001-8832-4488
Ziegler, Carl0000-0002-0619-7639
Atkinson, Dani0000-0001-8589-1938
Law, Nicholas M.0000-0001-9380-6457
Riddle, Reed0000-0002-0387-370X
Hagelberg, Janis0000-0002-1096-1433
Hodapp, Klaus W.0000-0003-0786-2140
Additional Information:© 2017 The American Astronomical Society. Received 2017 January 17; revised 2017 August 4; accepted 2017 August 22; published 2017 September 27. This research is supported by the NASA Exoplanets Research Program, grant #NNX 15AC91G. J.S. acknowledges the UK. S.L.C. C.B. acknowledges support from the Alfred P. Sloan Foundation. We thank Joanna Bulger for helping with the Subaru observations. The Robo-AO system was developed by collaborating partner institutions, the California Institute of Technology and the Inter-University Centre for Astronomy and Astrophysics, and with the support of the National Science Foundation under grant Nos. AST-0906060, AST-0960343, and AST-1207891, the Mt. Cuba Astronomical Foundation, and by a gift from Samuel Oschin. Some of the data presented herein were obtained at the W.M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W.M. Keck Foundation. This work is based in part on data collected at Subaru Telescope, which is operated by the National Astronomical Observatory of Japan. SNIFS on the UH 2.2 m telescope is part of the Nearby Supernova Factory project, a scientific collaboration among the Centre de Recherche Astronomique de Lyon, Institut de Physique Nuclaire de Lyon, Laboratoire de Physique Nuclaire et des Hautes Energies, Lawrence Berkeley National Laboratory, Yale University, University of Bonn, Max Planck Institute for Astrophysics, Tsinghua Center for Astrophysics, and the Centre de Physique des Particules de Marseille. The authors recognize and acknowledge the very significant cultural role and reverence that the summit of Maunakea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain. Facilities: PO:1.5m (Robo-AO) - , Keck:II (NIRC2-NGS) - , Subaru (IRCS) - , UH:2.2m (SNIFS) - .
Funders:
Funding AgencyGrant Number
NASANNX 15AC91G
Alfred P. Sloan FoundationUNSPECIFIED
NSFAST-0906060
NSFAST-0960343
NSFAST-1207891
Mt. Cuba Astronomical FoundationUNSPECIFIED
Samuel OschinUNSPECIFIED
W. M. Keck FoundationUNSPECIFIED
Subject Keywords:asteroseismology; binaries: close; instrumentation: adaptive optics; methods: observational; stars: fundamental parameters; techniques: high angular resolution
Record Number:CaltechAUTHORS:20170926-111646660
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20170926-111646660
Official Citation:Jessica S. Schonhut-Stasik et al 2017 ApJ 847 97
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:81835
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:26 Sep 2017 19:28
Last Modified:21 Mar 2019 22:09

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