JWST NIRISS/SOSS data yield a transmission spectrum of the 23 Myr V1298 Tau c showing H2O absorption and an atmospheric metallicity of 14.8^{+56}_{-12} times solar, lower than mature planets of similar mass.
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The transmission spectrum of AU Mic b is dominated by the transit light source effect from stellar spots, yielding only weak atmospheric constraints with a preferred scale height below 185 km.
Synthetic spectra tests show Zeeman broadening recovers M dwarf magnetic field strengths more reliably with joint abundance fitting and WAIC selection than with free line strengths or BIC/AIC, which underestimate by 30-50% in active cases.
Rotationally modulated radio pulses with near-100% circular polarization from M dwarf ASKAP J181335-604720 are interpreted as coherent electron cyclotron maser emission from its magnetosphere based on simultaneous radio-optical observations.
Pandora simulations recover stellar photospheric temperatures to ~30 K with no bias and reduce simple spot contamination from 100-1000 ppm to under 10 ppm, but complex spot geometries leave ~1000 ppm residuals.
Proposes a two-generation Nautilus observatory program using time-series spectroscopy of transiting systems and stellar monitoring to benchmark models of stellar photospheric heterogeneities for exoplanet transmission spectroscopy.
HD 251108 is a binary with a 1.3 solar-mass K giant and 0.25 solar-mass M dwarf, featuring a migrating spot that explains 12-year photometric modulation and RV variations from both activity and orbit.
Tentative evidence for a super-Jupiter at 15-100 AU or brown dwarf at 20-170 AU in 51 Pegasi from RV curvature, but the signal is likely driven by Lick/Hamilton instrument drift.
Updated masses, spot model, and third-body candidate for the detached eclipsing binary IR Cas from combined TESS, ground photometry, and spectroscopy.
New spectroscopic measurements of RGB stars in nine open clusters confirm mass-dependent extra-mixing processes and indicate that initial 17O and 18O abundances may vary.
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KRONOS I: The $1{-}2.8\mu$m JWST Transmission Spectrum of the 23 Myr V1298 Tau c
JWST NIRISS/SOSS data yield a transmission spectrum of the 23 Myr V1298 Tau c showing H2O absorption and an atmospheric metallicity of 14.8^{+56}_{-12} times solar, lower than mature planets of similar mass.