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 catalog of panchromatic spectral energy distributions (SEDs) for7 M and 4 K dwarf stars that span X-ray to infrared wavelengths (5 {\AA} - 5.5{\mu}m). These SEDs are composites of Chandra or XMM-Newton data from 5 - ~50{\AA}, a plasma emission model from ~50 - 100 {\AA}, broadband empiricalestimates from 100 - 1170 {\AA}, HST data from 1170 - 5700 {\AA}, including areconstruction of stellar Ly{\alpha} emission at 1215.67 {\AA}, and a PHOENIXmodel spectrum from 5700 - 55000 {\AA}. Using these SEDs, we computed thephotodissociation rates of several molecules prevalent in planetary atmosphereswhen exposed to each star's unattenuated flux ("unshielded" photodissociationrates) and found that rates differ among stars by over an order of magnitudefor most molecules. In general, the same spectral regions drive unshieldedphotodissociations both for the minimally and maximally FUV active stars.However, for ozone visible flux drives dissociation for the M stars whereas NUVflux drives dissociation for the K stars. We also searched for an FUV continuumin the assembled SEDs and detected it in 5/11 stars, where it contributesaround 10% of the flux in the range spanned by the continuum bands. Anultraviolet continuum shape is resolved for the star {\epsilon} Eri that showsan edge likely attributable to Si II recombination. The 11 SEDs presented inthis paper, available online through the Mikulski Archive for Space Telescopes,will be valuable for vetting stellar upper-atmosphere emission models andsimulating photochemistry in exoplanet atmospheres.

The MUSCLES Treasury Survey III: X-ray to Infrared Spectra of 11 M and K Stars Hosting Planets