English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We present a new precision radial velocity (RV) dataset that reveals multipleplanets orbiting the stars in the $\sim$360 AU, G2$+$G2 "twin" binary HD133131AB. Our 6 years of high-resolution echelle observations from MIKE and 5years from PFS on the Magellan telescopes indicate the presence of twoeccentric planets around HD 133131A with minimum masses of 1.43$\pm$0.03 and0.63$\pm$0.15 $\mathcal{M}_{\rm J}$ at 1.44$\pm$0.005 and 4.79$\pm$0.92 AU,respectively. Additional PFS observations of HD 133131B spanning 5 yearsindicate the presence of one eccentric planet of minimum mass 2.50$\pm$0.05$\mathcal{M}_{\rm J}$ at 6.40$\pm$0.59 AU, making it one of the longest periodplanets detected with RV to date. These planets are the first to be reportedprimarily based on data taken with PFS on Magellan, demonstrating theinstrument's precision and the advantage of long-baseline RV observations. Weperform a differential analysis between the Sun and each star, and between thestars themselves, to derive stellar parameters and measure a suite of 21abundances across a wide range of condensation temperatures. The host stars areold (likely $\sim$9.5 Gyr) and metal-poor ([Fe/H]$\sim$-0.30), and we detect a$\sim$0.03 dex depletion in refractory elements in HD 133131A versus B (withstandard errors $\sim$0.017). This detection and analysis adds to a small butgrowing sample of binary "twin" exoplanet host stars with precise abundancesmeasured, and represents the most metal-poor and likely oldest in that sample.Overall, the planets around HD 133131A and B fall in an unexpected regime inplanet mass-host star metallicity space and will serve as an importantbenchmark for the study of long period giant planets.

The Magellan PFS Planet Search Program: Radial Velocity and Stellar Abundance Analyses of the 360 AU, Metal-Poor Binary "Twins" HD 133131A & B