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

Tight binaries discovered in young, nearby associations, with knowndistances, are ideal targets to provide dynamical mass measurements to test thephysics of evolutionary models at young ages and very low masses. We report forthe first time the binarity of TWA22, possible new dynamical calibrator forevolutionary models at young ages. Based on an accurate trigonometric distance(17.53 +- 0.21 pc) determination, we infer a total dynamical mass of 220 +- 21MJup for the system. From the resolved near-infrared integral-fieldspectroscopy, we find an effective temperature Teff=2900+200-200 K for TWA22 Aand Teff=2900+200-100 K for TWA22 B and surface gravities between 4.0 and 5.5dex. From our photometry and a M6 +- 1 spectral type for both components, wefind luminosities of log(L/Lsun)=-2.11 +- 0.13 dex and log(L/Lsun)=-2.30 +-0.16 dex for TWA22 A and B respectively. By comparing these parameters withevolutionary models, we question the age and the multiplicity of this system.We also discuss a possible underestimation of the mass predicted byevolutionary models for young stars close to the substellar boundary.

The young, tight and low mass binary TWA22AB: a new calibrator for evolutionary models ? Orbit, spectral types and temperatures determination