SONG policies

SONG policies

Below you will find the latest SONG policy document which include publication policies and general policies on the SONG project.

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Latest published SONG papers

29/04 - 2020 |

Paul A. Dalba: The TESS-Keck Survey. I. A Warm Sub-Saturn-mass Planet and a...

We report the detection of a Saturn-size exoplanet orbiting HD 332231 (TOI 1456) in light curves from the Transiting Exoplanet Survey Satellite (TESS). HD 332231—an F8 dwarf star with a $V$-band magnitude of 8.56—was observed by TESS in Sectors 14 and 15. We detect a single-transit event in the Sector 15 presearch data conditioning (PDC) light curve. We obtain spectroscopic follow-up observations of HD 332231 with the Automated Planet Finder, Keck I, and SONG telescopes. The orbital...

28/04 - 2020 |

Yue Xiang: Doppler imaging and differential rotation of $\sigma^{2}$ Coronae...

We present new Doppler images of both components of the double-lined binary $\sigma^{2}$ CrB, based on the high-resolution spectroscopic data collected during 11 nights in 2015 March–April. The observed spectra form two independent data sets with sufficient phase coverage. We apply the least-squares deconvolution to all observed spectra to obtain high signal-to-noise mean profiles, from which we derive the Doppler images of both components of $\sigma^{2}$ CrB simultaneously. The surfaces of...

5/03 - 2020 |

O. Creevey: Sun-like Oscillations in the Population II giant HD 122563

We have been monitoring the metal-poor Population II giant, HD 122563, for radial velocity variations since 2016 using the SONG telescope on Tenerife. We have detected the global seismic quantity $\nu_{\rm max}$ which provides information related to the stellar parameters. By combining these data with complementary data, we derive a new precise surface gravity, radius and distance to the star. Our results are corroborated by using the parallax from Gaia DR2. We present these results and some...

8/11 - 2019 |

Amalie Stokholm: The subgiant HR 7322 as an asteroseismic benchmark star

We present an in-depth analysis of the bright subgiant star HR 7322 (KIC 10005473) using Kepler short-cadence photometry, optical interferometry from CHARA, high-resolution spectroscopy using SONG spectra, and stellar modelling using garstec grids and the Bayesian grid-fitting algorithm basta. HR 7322 is only the second subgiant with high-quality Kepler asteroseismology for which we also have interferometric data. We find a limb-darkened angular diameter of $0.443 \pm 0.007$ mas, which...

20/09 - 2019 |

Will M. Farr: Aldebaran b’s Temperate Past Uncovered in Planet Search Data

The nearby red giant Aldebaran is known to host a gas giant planetary companion from decades of ground-based spectroscopic radial velocity measurements. Using Gaussian Process-based Continuous Auto-Regressive Moving Average models, we show that these historic data also contain evidence of acoustic oscillations in the star itself, and verify this result with further dedicated ground-based spectroscopy using the SONG telescope and space-based photometry with the Kepler Space Telescope. From the...

3/07 - 2019 |

A. Bonanno: Acoustic oscillations and dynamo action in the G8 sub-giant EK Eri

We present further evidence of the presence of acoustic oscillations on the slowly-rotating, over-active G8 sub-giant EK Eri. This star was observed with the 1-m Hertzsprung SONG telescope, at the Observatorio del Teide. We determined a significant excess of power around $\nu_{\rm max} = 253 \pm 3\,\mu$Hz in one observing run and we were able to determine the large separation $\Delta\nu = 16.43 \pm 0.22\,\mu$Hz. No significant excess of power was instead detected in a subsequent observing...

8/05 - 2019 |

O. Creevey: First detection of oscillations in the Halo giant HD 122563...

The nearby metal-poor giant HD122563 is an important astrophysical laboratory for which to test stellar atmospheric and interior physics. It is also a benchmark star for which to calibrate methods to apply to large scale surveys. Recently it has been remeasured using various methodologies given the new high precision instruments at our disposal. However, inconsistencies in the observations and models have been found. In order to better characterise this star we have been measuring its...

21/03 - 2019 |

M. Fredslund Andersen: Oscillations in the Sun with SONG: Setting the scale...

Context. We present the first high-cadence multi-wavelength radial-velocity observational campaign of the Sun-as-a-star, carried out during 57 consecutive days using the stellar échelle spectrograph at the Hertzsprung SONG Telescope operating at the Teide Observatory on Tenerife. Aims. The aim was to produce a high-quality data set and reference values for the global helioseismic parameters $\nu_{max, \odot}$, and $\Delta \nu_{\odot}$ of the spectrum of solar p-modes using the SONG...

21/03 - 2019 |

M. Fredslund Andersen: Conducting the SONG: The Robotic Nature and Efficiency of...

We present a description of "the Conductor," an automated software package that handles all observations at the first Stellar Observations Network Group (SONG) node telescope at the Teide Observatory on the island of Tenerife. The idea was to provide a complete description on the automated procedures for target selection and execution of observations and to demonstrate how the SONG robotic telescope is being operated. The Conductor is a software package developed in Python and running on a...

1/03 - 2019 |

T. Arentoft: Asteroseismology of the Hyades red giant and planet host $\epsilon...

Asteroseismic analysis of solar-like stars allows us to determine physical parameters such as stellar mass, with a higher precision compared to most other methods. Even in a well-studied cluster such as the Hyades, the masses of the red giant stars are not well known, and previous mass estimates are based on model calculations (isochrones). The four known red giants in the Hyades are assumed to be clump (core-helium-burning) stars based on their positions in colour-magnitude diagrams, however...