Mapping the subsurface structure and flow field of sunspots has been a challenging task for helioseismology. In this work, we investigate the propagation of acoustic waves in a sunspot in NOAA active region 11312 using time─distance helioseismology. Travel-times of waves traveling into and out of the sunspot are measured as functions of travel

The balloon-borne stratospheric solar observatory SUNRISE III successfully completed 6.5 days of observations in 2024 July. One of its focal-plane instruments, the Sunrise Chromospheric Infrared spectroPolarimeter (SCIP), is a slit-scanning spectropolarimeter that simultaneously measures full Stokes profiles of multiple spectral lines in the 850 nm

A wide range of variability mechanisms exist among intermediate-mass and massive stars, which are not yet fully understood. Using complementary data sources for a large population of B- and O-type stars, we aim to study the prevalence and interplay of different types of variability, including binarity, pulsation, and rotation, to prepare for future

We characterize the radius-dependent observed transiting eccentricity distribution of 219 warm (P = 8─50 days) systems with only one transiting planetary candidate identified during Sectors 1─69 of the Transiting Exoplanet Survey Satellite (TESS) mission. Using the "photoeccentric effect" in a hierarchical Bayesian framework, we first model the

Of the >500 confirmed transiting hot Jupiters and ≈2000 additional candidates today, only 10 are known to have nearby companion planets. The survival of nearby companions means that these hot Jupiters cannot have migrated to their present location via dynamically disruptive high-eccentricity migration but instead have undergone disk migration or

The population of active galactic nuclei (AGNs) newly discovered by the James Webb Space Telescope (JWST) exhibits peculiar properties that distinguish it from both local type I AGNs and high-redshift quasars. Most of these sources are compact, appearing as `little dots'; among them, the sub-class (10-30% of the total) characterised by