Searching for Exoplanets Born Outside the Milky Way: VOYAGERS Survey Design
Robert Aloisi, Andrew Vanderburg, Melinda Soares-Furtado, Phillip Cargile, Ke Zhang, Lina Necib, David W. Latham, Sam Quinn, Emily Pass, Anne Dattilo, Giacomo Mantovan, Francesco Amadori, Mariona Badenas-Agusti, Perry Berlind, Francesco Borsa, Walter Boschin, Lorenzo Cabona

TL;DR
This paper presents the design and early implementation of the VOYAGERS survey, aiming to detect exoplanets around ancient dwarf galaxy stars that merged with the Milky Way, to compare their planetary populations.
Contribution
It introduces a novel radial velocity survey targeting low-metallicity stars from Gaia-Enceladus to explore exoplanet occurrence outside the Milky Way.
Findings
778 observations on 22 candidates collected so far
Survey sensitive to sub-Neptune mass planets with periods up to hundreds of days
Expected to detect three planets if Milky Way-like occurrence rates are valid
Abstract
Observations over the past few decades have found that planets are common around nearby stars in our Galaxy, but little is known about planets that formed outside the Milky Way. We describe the design and early implementation of a survey to test whether planets also exist orbiting the remnant stars of ancient dwarf galaxies that merged with the Milky Way, and if so, how they differ from their Milky Way counterparts. VOYAGERS (Views Of Yore - Ancient Gaia-enceladus Exoplanet Revealing Survey) is a radial velocity (RV) search using precision spectrographs to discover exoplanets orbiting very low metallicity () stars born in the dwarf galaxy Enceladus, which merged with the Milky Way galaxy about 10 Gyr ago. A sample of 22 candidates have been screened from a catalog of Gaia-Enceladus-Sausage (GES) members using a combination of stellar properties and…
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Taxonomy
TopicsStellar, planetary, and galactic studies · Astronomy and Astrophysical Research · Gamma-ray bursts and supernovae
