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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

CONTEXT. Little is known about the planetary systems around single whitedwarfs although there is strong evidence that they do exist.  AIMS. We performed a pilot study with the extreme-AO system on theSpectro-Polarimetric High-contrast Exoplanet REsearch (SPHERE) on the VeryLarge Telescopes (VLT) to look for giant planets around a young white dwarf, GD50.  METHODS. We were awarded science verification time on the new ESO instrumentSPHERE. Observations were made with the InfraRed Dual-band Imager andSpectrograph in classical imaging mode in H band.  RESULTS. Despite the faintness of the target (14.2 mag in R band), the AOloop was closed and a strehl of 37\% was reached in H band. No objects weredetected around GD 50. We achieved a 5-sigma contrast of 6.2, 8.0 and 8.25 magsat 0{\farcs}2, 0{\farcs}4 and 0{\farcs}6 and beyond, respectively. We excludeany substellar objects more massive than 4.0 M$_\textrm{J}$ at 6.2 AU, 2.9M$_\textrm{J}$ at 12.4 AU and 2.8 M$_\textrm{J}$ at 18.6 AU and beyond. Thisrivals the previous upper limit set by Spitzer. We further show that SPHERE isthe most promising instrument available to search for close-in substellarobjects around nearby white dwarfs.

An Extreme-AO Search for Giant Planets around a White Dwarf --VLT/SPHERE performance on a faint target GD 50