A JWST Transit of a Jupiter Analog. II. A Search for Exomoons

01/08/2026 - Exoplanets

We present a search for exomoons around the Jupiter-like exoplanet Kepler-167e using a NIRSpec JWST transit. Our 60 hr time series clearly reveals the enormous impact of long-term trends in NIRSpec data, specifically a gradual flux drift occurring over each of six 10 hr exposures. We weighed the evidence for exomoons by comparing a planet-only…

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Towards a consistent framework of determining the active galactic nucleus contribution fraction and host galaxy properties

01/08/2026 - Low-Energy

Decomposing the contributions of active galactic nuclei (AGNs) from their host galaxies is essential for identifying AGN-dominated galaxies and accurately deriving key physical properties of both supermassive black holes (SMBHs) and their host galaxies, such as black hole accretion rates, stellar masses, and star formation rates. However, decomposing AGN contributions from multi-wavelength photometry remains challenging…

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Observation of a Solar-like Magnetic Reconnection Event in an AGN Corona with XRISM

01/08/2026 - High-Energy

The X-ray source in active galactic nuclei (AGNs) is commonly referred to as the corona by analogy to stellar coronae. The similarities between the two suggest that the heating mechanism of AGN coronae is magnetic reconnection—as in cool stars—but this has not yet been directly observed. This work presents the first observational evidence for a…

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