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 present the first analysis of JWST near-infrared spectroscopy of stellarflares from TRAPPIST-1 during transits of rocky exoplanets. Four flares wereobserved from 0.6--2.8 $\mu$m with NIRISS and 0.6--3.5 $\mu$m with NIRSpecduring transits of TRAPPIST-1b, f, and g. We discover P$\alpha$ and Br$\beta$line emission and characterize flare continuum at wavelengths from 1--3.5$\mu$m for the first time. Observed lines include H$\alpha$,P$\alpha$-P$\epsilon$, Br$\beta$, He I $\lambda$0.7062$\mu$m, two Ca IIinfrared triplet (IRT) lines, and the He I IRT. We observe a reversed Paschendecrement from P$\alpha$-P$\gamma$ alongside changes in the light curve shapesof these lines. The continuum of all four flares is well-described by blackbodyemission with an effective temperature below 5300 K, lower than temperaturestypically observed at optical wavelengths. The 0.6--1 $\mu$m spectra wereconvolved with the TESS response, enabling us to measure the flare rate ofTRAPPIST-1 in the TESS bandpass. We find flares of 10$^{30}$ erg large enoughto impact transit spectra occur at a rate of 3.6$\substack{+2.1 \\ -1.3}$ flared$^{-1}$, $\sim$10$\times$ higher than previous predictions from K2. We measurethe amount of flare contamination at 2 $\mu$m for the TRAPPIST-1b and ftransits to be 500$\pm$450 and 2100$\pm$400 ppm, respectively. We find up to80% of flare contamination can be removed, with mitigation most effective from1.0--2.4 $\mu$m. These results suggest transits affected by flares may still beuseful for atmospheric characterization efforts.

Characterizing the Near-infrared Spectra of Flares from TRAPPIST-1 During JWST Transit Spectroscopy Observations