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

We present a high-contrast imaging search for Pa$\beta$ line emission fromprotoplanets in the PDS~70 system with Keck/OSIRIS integral field spectroscopy.We applied the high-resolution spectral differential imaging technique to theOSIRIS $J$-band data but did not detect the Pa$\beta$ line at the levelpredicted using the parameters of \cite{Hashimoto2020}. This lack of Pa$\beta$emission suggests the MUSE-based study may have overestimated the line width ofH$\alpha$. We compared our Pa$\beta$ detection limits with the previousH$\alpha$ flux and H$\beta$ limits and estimated $A_{\rm V}$ to be $\sim0.9$and 2.0 for PDS~70~b and c respectively. In particular, PDS~70~b's $A_{\rm V}$is much smaller than implied by high-contrast near-infrared studies, whichsuggests the infrared-continuum photosphere and the hydrogen-emitting regionsexist at different heights above the forming planet.

Keck/OSIRIS Pa$\beta$ high-contrast imaging and updated constraints on PDS~70b