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 Tools annual

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 monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

We report signatures of episodic accretion in young stellar objects (YSOs)that emerge in protobinary configurations in a gravoturbulent gas collapse. Wefind in most of these protobinary systems strong accretion bursts between thetwo companions with a recurrence time-scale of about 1 kyr. The accretion rateonto the secondary star typically exceeds that onto the primary with a peakvalue of 2 $\times 10^{-2}$ M$_{\odot}$ yr$^{-1}$ for the former and 6 $\times10^{-3}$ M$_{\odot}$ yr$^{-1}$ for the latter. We propose that the secondarycompanion which remains more active in its episodes of accretion bursts,especially for the gas cores with subsonic velocity dispersion, may provideobservational opportunities to find traces of episodic accretion in thesurrounding gas of the embedded YSOs that are in a binary configuration. Also,protostars evolving as single objects in the same environment show feweraccretion bursts and all together a more steady mass growth history. Theprestellar cores with subsonic velocity dispersion exhibit an order ofmagnitude more intense accretion bursts than in the case of cores withsupersonic velocity dispersions. The latter shows the formation of some of theprotobinaries in which the primary acts as a more actively accreting companion.This can support these binaries to become systems of extreme mass ratio.Moreover, the YSOs in binary configurations with small semi-major axis $a$$\approx$ 50 au and high mass ratio $q$ > 0.7 support phases of intenseepisodic accretion. The eccentricity, however, seems to play no significantrole in the occurrence of accretion bursts.

Turbulence and its connection to episodic accretion in binary YSOs