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/

Zendy Plus

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

Zendy Tools

Zendy Open

We present aperture masking interferometry (AMI) observations of the star HIP65426 at $3.8\,\rm{\mu m}$ as a part of the JWST Direct Imaging Early ReleaseScience (ERS) program obtained using the Near Infrared Imager and SlitlessSpectrograph (NIRISS) instrument. This mode provides access to very small innerworking angles (even separations slightly below the Michelson limit of$0.5\lambda/D$ for an interferometer), which are inaccessible with theclassical inner working angles of the JWST coronagraphs. When combined withJWST's unprecedented infrared sensitivity, this mode has the potential to probea new portion of parameter space across a wide array of astronomicalobservations. Using this mode, we are able to achieve a $5\sigma$ contrast of$\Delta m{\sim}7.62{\pm}0.13$ mag relative to the host star at separations${\gtrsim}0.07{"}$, and the contrast deteriorates steeply at separations${\lesssim}0.07{"}$. However, we detect no additional companions interior tothe known companion HIP 65426 b (at separation ${\sim}0.82{"}$ or,$87^{+108}_{-31}\,\rm{au}$). Our observations thus rule out companions moremassive than $10{-}12\,\rm{M_{Jup}}$ at separations ${\sim}10{-}20\,\rm{au}$from HIP 65426, a region out of reach of ground or space-based coronagraphicimaging. These observations confirm that the AMI mode on JWST is sensitive toplanetary mass companions at close-in separations (${\gtrsim}0.07{"}$), evenfor thousands of more distant stars at $\sim$100 pc, in addition to the starsin the nearby young moving groups as stated in previous works. This result willallow the planning and successful execution of future observations to probe theinner regions of nearby stellar systems, opening an essentially unexploredparameter space.

The JWST Early Release Science Program for Direct Observations of  Exoplanetary Systems III: Aperture Masking Interferometric Observations of  the star HIP 65426 at 3.8 um