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

The star EPIC 210894022 has been identified from a light curve acquiredthrough the K2 space mission as possibly orbited by a transiting planet. Ouraim is to confirm the planetary nature of the object and derive its fundamentalparameters. We combine the K2 photometry with reconnaissance spectroscopy andradial velocity (RV) measurements obtained using three separate telescope andspectrograph combinations. The spectroscopic synthesis package SME has beenused to derive the stellar photospheric parameters that were used as input tovarious stellar evolutionary tracks in order to derive the parameters of thesystem. The planetary transit was also validated to occur on the assumed hoststar through adaptive imaging and statistical analysis. The star is found to belocated in the background of the Hyades cluster at a distance at least 4 timesfurther away from Earth than the cluster itself. The spectrum and the spacevelocities of EPIC 210894022 strongly suggest it to be a member of the thickdisk population. We find that the star is a metal poor ([Fe/H]=-0.53+/-0.05dex) and alpha-rich somewhat evolved solar-like object of spectral type G3 withTeff=5730+/-50 K, logg=4.15+/-0.1 (cgs), radius of 1.3+/-0.1 R_Sun, and mass of0.88+/-0.02 M_Sun. The RV detection together with the imaging confirms with ahigh level of significance that the transit signature is caused by asuper-Earth orbiting the star EPIC 210894022. We measure a mass of 8.6+/-3.9M_Earth and a radius of 1.9+/-0.2 R_Earth. A second more massive object with aperiod longer than about 120 days is indicated by a long term linearacceleration. With an age of > 10 Gyrs this system is one of the oldest whereplanets is hitherto detected. Further studies of this planetary system isimportant since it contains information about the planetary formation processduring a very early epoch of the history of our Galaxy.

EPIC 210894022b - A short period super-Earth transiting a metal poor, evolved old star