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

Abstract

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.

16 pages, 8 figures, 5 tables. Updated version, accepted to AJ

References in corpus (19)

• How to Constrain Your M Dwarf: measuring effective temperature, bolometric luminosity, mass, and radius
• The Stellar Populations of Praesepe and Coma Berenices
• Revised Stellar Properties of Kepler Targets for the Q1-17 (DR25) Transit Detection Run
• A survey of the high order multiplicity of nearby solar-type binary stars with Robo-AO
• The Impact of Stellar Multiplicity on Planetary Systems, I.: The Ruinous Influence of Close Binary Companions
• The Automated Palomar 60-Inch Telescope
• An ancient extrasolar system with five sub-Earth-size planets
• Influence of Stellar Multiplicity On Planet Formation. II. Planets Are Less Common in Multiple-Star Systems with Separations Smaller than 1500 AU
• Impact on asteroseismic analyses of regular gaps in Kepler data
• High-efficiency Autonomous Laser Adaptive Optics
• Orbital Architectures of Planet-Hosting Binaries: I. Forming Five Small Planets in the Truncated Disk of Kepler-444A
• Robo-AO Kepler Planetary Candidate Survey II: Adaptive Optics Imaging of 969 Kepler Exoplanet Candidate Host Stars
• Oscillation mode linewidths and heights of 23 main-sequence stars observed by Kepler
• A lucky imaging multiplicity study of exoplanet host stars II
• Bringing the Visible Universe into Focus with Robo-AO
• Robo-AO Kitt Peak: Status of the system and deployment of a sub-electron readnoise IR camera to detect low-mass companions
• Probability of Physical Association of 104 Blended Companions to \textit{Kepler} Objects of Interest Using Visible and Near-Infrared Adaptive Optics Photometry
• The Robo-AO automated intelligent queue system
• The Robo-AO KOI Survey: laser adaptive optics imaging of every Kepler exoplanet candidate

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• Testing abundance-age relations beyond solar analogues with Kepler LEGACY stars
• Robo-AO Kepler Asteroseismic Survey. II. Do Stellar Companions Inhibit Stellar Oscillations?
• FluxCT: A Web Tool for Identifying Contaminating Flux in Kepler and TESS Target Pixel Files
• FluxCT V2.0: Updates to a Web Tool Identifying Contaminating Flux in Space Telescope Data