Kavli Affiliate: Michael Miller | Authors: Janine L. Gray, Mia C. Callens, Amelia Henley, Daniel Zaidman, Carmen Jimenez Antunez, Andrew P. Thompson, Zhihe Lei, Rachael Skyner, Michael Miller, Eleanor P. Williams, Anya Robinson, Raina Seupal, Matt T. Fry, Mihajlo Filep, Frank von Delft, Michael P. Willis, Annette R. von Delft, Nir London and Paul E. […]
Kavli Affiliate: Alexander Ji | Summary:We report an independent identification of the ultra metal-poor (UMP) star ($rm[Fe/H] =-4.06$) $Gaia$ DR3 $textttsource_id$ 4795913112968206720 (GDR3_479591) in the $Gaia$ mission’s Blue and Red Photometer ‘XP’ spectro-photometric catalog. We combine multi-band photometry, astrometry, and high-resolution spectroscopy to confirm GDR3_479591 as a red giant-branch (RGB) star located at $sim 6,rm […]
Kavli Affiliate: Michael McDonald | Summary:This is the second paper in a series where we examine archival far-ultraviolet spectroscopy of 29 massive elliptical galaxies from the Far Ultraviolet Spectroscopic Explorer (FUSE) with modern methods. In the first paper, we performed SED modeling with aperture-matched photometry and analyzed the young and old stellar populations in these […]
Kavli Affiliate: Erin Kara | Summary:Measurements of stellar-mass black hole spin probe accretion under strong gravity and constrain black hole formation and evolution. Intermediate states, in which thermal disk, coronal, and reflection emission all contribute significantly, are particularly complex environments for spin measurements and useful for probing spectral-modeling systematics. We investigate these effects using paired, […]
Kavli Affiliate: Ali Javey | Summary:Helical order can facilitate symmetry breaking and emergent physical responses in crystalline materials, yet how intrinsic chirality manifests beyond atomic length scales remains poorly understood. Here, the direct observation and quantitative characterization of long-range crystallographic helicity in template-grown tellurium (Te) quantum wires on amorphous substrates are reported. Four-dimensional scanning transmission […]
Kavli Affiliate: Subo Dong | Summary:Recent studies found a number of short-timescale microlensing events that are thought to be produced by free-floating or wide-orbit planets. The microlensing event KMT-2024-BLG-0792/OGLE-2024-BLG-0516 is currently the only free-floating planet candidate with a directly measured mass ($0.73^+0.25_-0.15$ Saturn masses), derived from joint ground-based and Gaia satellite observations. However, it remains […]
Kavli Affiliate: Luis Ho | Summary:We present a comparative analysis of long-term mid-infrared (MIR) color variations (MCVs) for 1,977 narrow-line Seyfert 1 (NLSy1) and 4,113 broad-line Seyfert 1 (BLSy1) galaxies at $z < 0.3$. Using 14 years of WISE and NEOWISE data, we quantify the correlation between $W1-W2$ color and $W1$ magnitude. We categorize sources […]
Kavli Affiliate: Ali Javey | Summary:Tellurium (Te) is an intriguing one-dimensional (1D) semiconductor that has recently attracted considerable interest as a p-type channel material. However, scalable synthesis methods have lacked control over the orientation and patterning of the Te atomic chains, thus limiting its practical use. Guided by theory, we overcome this challenge using nanowire-shaped […]