Evidence for solar-like oscillations in beta Hydri

Abstract

We have made a clear detection of excess power, providing strong evidence for solar-like oscillations in the G2 subgiant beta Hyi. We observed this star over five nights with the UCLES echelle spectrograph on the 3.9-m Anglo-Australian Telescope, using an iodine absorption cell as a velocity reference. The time series of 1196 velocity measurements shows an rms scatter of 3.30 m/s, and the mean noise level in the amplitude spectrum at frequencies above 0.5 mHz is 0.11 m/s. We see a clear excess of power centred at 1.0 mHz, with peak amplitudes of about 0.5 m/s, in agreement with expectations for this star. Fitting the asymptotic relation to the power spectrum indicates the most likely value for the large separation is 56.2 microHz, also in good agreement with the known properties of beta Hyi.

Accepted by ApJ Letters

Cited by in corpus (41)

• Helioseismology
• Probing the interior physics of stars through asteroseismology
• Solar-like oscillations in alpha Centauri B
• Detection of Solar-like Oscillations in the G7 Giant Star xi Hya
• The fundamental definition of 'radial velocity'
• Solar-like Oscillations (Invited Review)
• Asymptotic and measured large frequency separations
• Asteroseismology and Interferometry
• P-mode observations on Alpha Cen A
• The acoustic spectrum of alpha Cen A
• Ultra-high-precision velocity measurements of oscillations in alpha Cen A
• Solar-like oscillations in the G2 subgiant beta Hydri from dual-site observations
• Impact of instrumental systematic errors on fine-structure constant measurements with quasar spectra
• Characterizing solar-type stars from full-length Kepler data sets using the Asteroseismic Modeling Portal
• Confirmation of solar-like oscillations in eta Bootis
• Radial Velocity Fitting Challenge. I. Simulating the data set including realistic stellar radial-velocity signals
• Asteroseismic modelling of the solar-type subgiant star $\beta$ Hydri
• p-mode frequencies in solar-like stars : I. Procyon A
• Solar-like oscillations of semiregular variables
• The Impact of Stellar Oscillations on Doppler Velocity Planet Searches
• Asteroseismic Signatures of Stellar Magnetic Activity Cycles
• Discover of the "missing" mode in HR 1217 by the Whole Earth Telescope
• The Age and Interior Rotation of Stars from Asteroseismology
• Asteroseismology of 36 \emph{Kepler} subgiants -- I. Oscillation frequencies, linewidths and amplitudes
• Oscillations in Arcturus from WIRE photometry
• Solar-like oscillations in Delta Scuti stars
• Empirical Constraints on Convective Core Overshoot
• The Current Status of Asteroseismology
• Asteroseismic modelling of the metal-poor star Tau Ceti
• Convective Excitation and Damping of Solar-like Oscillations
• Stellar Oscillations Network Group
• The relationship between photometric and spectroscopic oscillation amplitudes from 3D stellar atmosphere simulations
• Luminaries in the Sky: The TESS Legacy Sample of Bright Stars. I. Asteroseismic detections in naked-eye main-sequence and sub-giant solar-like oscillators
• Uncertainties and biases in modelling 16 Cyg A and B
• Asteroseismic modelling of the solar-like star $\beta$ Hydri
• The CARMENES search for exoplanets around M dwarfs. Line-by-line sensitivity to activity in M dwarfs
• TESS asteroseismology of $\beta$ Hydri: a subgiant with a born-again dynamo
• The frequency separations of stellar p-modes
• Evolution of Solar-Type Activity: Acoustic and Magnetic Energy Generation and Propagation in Beta Hydri (G2 IV)
• Asteroseismic Signatures of Magnetic Activity Variations in Solar-type Stars
• A Compact Spectrograph to Search for Extrasolar Planets