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

In our Galaxy, star formation occurs in a variety of environments, with alarge fraction of stars formed in clusters hosting massive stars. OB stars havean important feedback on the evolution of protoplanetary disks around nearbyyoung stars and likely on the process of planet formation occurring in them.The nearby massive association Cygnus OB2 is an outstanding laboratory to studythis feedback. It is the closest massive association to our Sun, and hostshundreds of massive stars and thousands of low mass members. In this paper, weanalyze the spatial variation of the disk fraction in Cygnus OB2 and we studyits correlation with the local values of Far and Extreme ultraviolet radiationfields and the local stellar surface density. We present definitive evidencethat disks are more rapidly dissipated in the regions of the associationcharacterized by intense local UV field and large stellar density. Inparticular, the FUV radiation dominates disks dissipation timescales in theproximity (i.e. within 0.5 pc) of the O stars. In the rest of the association,EUV photons potentially induce a significant mass loss from the irradiateddisks across the entire association, but the efficiency of this process isreduced at increasing distances from the massive stars due to absorption by theintervening intracluster material. We find that disk dissipation due to closestellar encounters is negligible in Cygnus OB2, and likely to have affected 1%or fewer of the stellar population. Disk dissipation is instead dominated byphotoevaporation. We also compare our results to what has been found in otheryoung clusters with different massive populations, concluding that massiveassociations like Cygnus OB2 are potentially hostile to protoplanetary disks,but that the environments where disks can safely evolve in planetary systemsare likely quite common in our Galaxy.

Photoevaporation and close encounters: how the environment around Cygnus OB2 affects the evolution of protoplanetary disks