Robo-AO Kepler Asteroseismic Survey. II. Do Stellar Companions Inhibit Stellar Oscillations?

Abstract

The Kepler space telescope observed over 15,000 stars for asteroseismic studies. Of these, 75% of dwarfs (and 8% of giants) were found to show anomalous behavior: such as suppressed oscillations (low amplitude) or no oscillations at all. The lack of solar-like oscillations may be a consequence of multiplicity, due to physical interactions with spectroscopic companions or due to the dilution of oscillation amplitudes from "wide'" (AO detected; visual) or spectroscopic companions introducing contaminating flux. We present a search for stellar companions to 327 of the Kepler asteroseismic sample, which were expected to display solar-like oscillations. We used direct imaging with Robo-AO, which can resolve secondary sources at ~0."15, and followed up detected companions with Keck AO. Directly imaged companion systems with both separations of $\le$0."5 and amplitude dilutions >10% all have anomalous primaries, suggesting these oscillation signals are diluted by a sufficient amount of excess flux. We also used the high-resolution spectrometer ESPaDOnS at CFHT to search for spectroscopic binaries. We find tentative evidence for a higher fraction of spectroscopic binaries with high radial velocity scatter in anomalous systems, which would be consistent with previous results suggesting that oscillations are suppressed by tidal interactions in close eclipsing binaries.

arXiv comment19 pages, 13 of text. 12 plots, 6 tables. Accepted to ApJ

References in corpus (37)

• Astropy: A Community Python Package for Astronomy
• Gaia Data Release 2. Summary of the contents and survey properties
• The SIMBAD astronomical database
• A Survey of Stellar Families: Multiplicity of Solar-Type Stars
• Kepler Input Catalog: Photometric Calibration and Stellar Classification
• SB9: The Ninth Catalogue of Spectroscopic Binary Orbits
• Tertiary companions to close spectroscopic binaries
• Kepler Eclipsing Binary Stars. II. 2165 Eclipsing Binaries in the Second Data Release
• Binarity in Brown Dwarfs: T Dwarf Binaries Discovered with the Hubble Space Telescope WPFC2
• Testing Scaling Relations for Solar-Like Oscillations from the Main Sequence to Red Giants using Kepler Data
• The APOKASC Catalog: An Asteroseismic and Spectroscopic Joint Survey of Targets in the Kepler Fields
• Revised Radii of Kepler Stars and Planets Using Gaia Data Release 2
• Ensemble Asteroseismology of Solar-Type Stars with the NASA Kepler Mission
• The Stellar Populations of Praesepe and Coma Berenices
• Revised Stellar Properties of Kepler Targets for the Q1-17 (DR25) Transit Detection Run
• Asteroseismology of 16000 Kepler Red Giants: Global Oscillation Parameters, Masses, and Radii
• Evidence for the impact of stellar activity on the detectability of solar-like oscillations observed by Kepler
• Predicting the detectability of oscillations in solar-type stars observed by Kepler
• Robotic Laser-Adaptive-Optics Imaging of 715 Kepler Exoplanet Candidates using Robo-AO
• A small survey of the magnetic fields of planet-host stars
• Measuring the Recoverability of Close Binaries in Gaia DR2 with the Robo-AO Kepler Survey
• High-efficiency Autonomous Laser Adaptive Optics
• Surface Activity and Oscillation Amplitudes of Red Giants in Eclipsing Binaries
• The catalogue of radial velocity standard stars for Gaia I. Pre-launch release
• Robo-AO Kepler Planetary Candidate Survey II: Adaptive Optics Imaging of 969 Kepler Exoplanet Candidate Host Stars
• Robo-AO Kepler Planetary Candidate Survey III: Adaptive Optics Imaging of 1629 Kepler Exoplanet Candidate Host Stars
• Assessing the Effect of Stellar Companions from High-Resolution Imaging of Kepler Objects of Interest
• Robo-AO Kepler Survey IV: the effect of nearby stars on 3857 planetary candidate systems
• A Search for Red Giant Solar-like Oscillations in All Kepler Data
• Robo-AO Kepler Survey V: The effect of physically associated stellar companions on planetary systems
• Refined Properties of the HD 130322 Planetary System
• The Performance of the Robo-AO Laser Guide Star Adaptive Optics System at the Kitt Peak 2.1-m Telescope
• Evidence for compact binary systems around Kepler red giants
• Probability of Physical Association of 104 Blended Companions to \textit{Kepler} Objects of Interest Using Visible and Near-Infrared Adaptive Optics Photometry
• Robo-AO Kepler Asteroseismic Survey. I. Adaptive optics imaging of 99 asteroseismic Kepler dwarfs and subgiants
• SRAO: optical design and the dual-knife-edge WFS
• Presence of mixed modes in red giants in binary systems

Cited by in corpus (6)

• Probing the interior physics of stars through asteroseismology
• Unresolved Binary Exoplanet Host Stars Fit as Single Stars: Effects on the Stellar Parameters
• Asteroseismology of luminous red giants with Kepler I: Long Period Variables with radial and non-radial modes
• FluxCT: A Web Tool for Identifying Contaminating Flux in Kepler and TESS Target Pixel Files
• The highest mass Kepler red giants -- II. Spectroscopic parameters, the amplitude-activity relation, and unexpected halo orbits
• FluxCT V2.0: Updates to a Web Tool Identifying Contaminating Flux in Space Telescope Data