Kavli Affiliate: Mark Vogelsberger | Summary:The origin and structure of the hot ($Tgtrsim10^6$K) gaseous halo around Milky Way (MW)-mass galaxies provide a critical test for galaxy formation models. We perform a comprehensive comparison for a sample of MW analogues from the TNG50 cosmological simulation by generating synthetic soft X-ray emission and O VII/O VIII absorption […]
Kavli Affiliate: Avi Shporer | Summary:Studying planetary interactions in exoplanet systems informs theories of planet formation and evolution, providing essential context for understanding our own solar system. We combine spectroscopy, transit photometry, transit timing variations, and astrometry to characterize the TOI-201 system. The co-transiting system consists of a super-Earth, warm Jupiter, and massive companion at […]
Kavli Affiliate: Andrew Vanderburg | Summary:Epsilon Indi A b is a directly imaged $sim6 M_rm Jup$ exoplanet orbiting a nearby (3.6 pc) K-dwarf at $sim 30$ AU. We analyze archival JWST/MIRI 15 $μ$m coronagraphic imaging of this planet to search for directly imaged satellites orbiting Eps Ind A b. Within the planet’s Hill sphere (radius […]
Kavli Affiliate: Mark Vogelsberger | Summary:Extreme emission-line galaxies (EELGs) probe chemical enrichment in low-mass, bursty systems where star formation, feedback, and gas accretion are poorly constrained. Using DESI DR1, we select 23 nearby EELGs with detections of 19 ionic species (S/N $geq$ 4), stellar masses $ M_* geq 10^7 M_odot$, and extreme H$α$ and [O […]
Kavli Affiliate: Saul Rappaport | Summary:Aims. We are attempting to better understand how stellar pulsations in close binary systems are affected, and possibly induced, by tidal, Coriolis, and centrifugal forces. Methods. We analyzed TESS data for some 50,000 potential eclipsing binaries selected by machine learning algorithms in order to search for pulsation multiplets split by […]
Kavli Affiliate: Erin Kara | Summary:1ES 1927+654 is an extreme active galactic nucleus (AGN) that has defied our canonical expectations for how AGN appear across the electromagnetic spectrum and how they vary on short timescales. In 2022, this source began showing a X-ray quasi-periodic oscillation (QPO) at mHz frequencies, along with a newly launched radio […]
Kavli Affiliate: Erin Kara | Summary:Little Red Dots (LRDs) are a population of compact, red sources that have emerged as one of the most puzzling findings of JWST. Variability provides a direct probe of their central engines. Here we present the first joint spectroscopic and photometric time-domain study of LRDs undertaken with the JWST TWINKLE […]
Kavli Affiliate: Anna Frebel | Summary:The actinides, including thorium (Th), are the heaviest observable elements synthesized in the universe, holding clues to the extremes of the astrophysical and nuclear conditions of $r$-process sites. We present Th abundances based on high-resolution spectroscopy for 47 metal-poor stars, the largest homogeneously analyzed sample to date. The chemical evolution […]
Kavli Affiliate: George Ricker | Summary:The PLAnetary Transits and Oscillations of stars (PLATO) mission is expected to launch in January 2027. A total of 8% of its data rate will be dedicated to complementary science targets selected from approved Guest Observer proposals. We seek to provide an open-source catalogue of variable stars in PLATO’s first […]
Kavli Affiliate: Paul Schechter | Summary:We anticipate that hundreds of thousands of distant, strongly gravitationally lensed sources will be detectable with the European Space Agency’s (ESA) Euclid mission and the Rubin Observatory Legacy Survey of Space and Time. We consider the virtues and shortcomings of the Singular Isothermal Elliptical Potential (SIEP) with Parallel External Shear […]