Search Publications
The Red Supergiant Progenitor of Type II Supernova 2024ggi
Wang, Xiaofeng; Zhang, Jujia; Mo, Jun +8 more
We present a detailed analysis of the progenitor and its local environment for the recently discovered Type II supernova (SN) 2024ggi at a distance of about 6.7 Mpc, by utilizing the pre-explosion images from the Hubble Space Telescope and Spitzer Space Telescope. The progenitor is identified as a red bright variable star, with absolute F814W-band…
The High-Redshift Gas-Phase Mass–Metallicity Relation in FIRE-2
Faucher-Giguère, Claude-André; Hayward, Christopher C.; Feldmann, Robert +2 more
The unprecedented infrared spectroscopic capabilities of JWST have provided high-quality interstellar medium metallicity measurements and enabled characterization of the gas-phase mass–metallicity relation (MZR) for galaxies at z ≳ 5 for the first time. We analyze the gas-phase MZR and its evolution in a high-redshift suite of FIRE-2 cosmological …
Morphology of Galaxies in JWST Fields: Initial Distribution and Evolution of Galaxy Morphology
Hwang, Ho Seong; Lee, Jeong Hwan; Park, Changbom +1 more
A recent study from the Horizon Run 5 (HR5) cosmological simulation has predicted that galaxies with
CECILIA: Direct O, N, S, and Ar Abundances in Q2343-D40, a Galaxy at z ∼ 3
Rudie, Gwen C.; Strom, Allison L.; Trainor, Ryan F. +3 more
Measurements of chemical abundances in high-z star-forming (SF) galaxies place important constraints on the enrichment histories of galaxies and the physical conditions in the early Universe. The James Webb Space Telescope (JWST) is beginning to enable direct chemical abundance measurements in galaxies at z > 2 via the detection of the faint T …
No Thick Atmosphere on the Terrestrial Exoplanet Gl 486b
Eastman, Jason D.; Bean, Jacob L.; Zhang, Michael +8 more
A primary science goal for JWST is to detect and characterize the atmospheres of terrestrial planets orbiting M dwarfs (M-Earths). The existence of atmospheres on M-Earths is highly uncertain because their host stars' extended history of high X-ray and ultraviolet irradiation may act to completely remove their atmospheres. We present two JWST seco…
Active Galactic Nuclei and Host Galaxies in COSMOS-Web. I. NIRCam Images, Point-spread-function Models and Initial Results on X-Ray-selected Broad-line AGNs at 0.35 ≲ z ≲ 3.5
Shen, Yue; Zhuang, Ming-Yang; Li, Junyao
We present detailed and comprehensive data reduction and point-spread-function (PSF) model construction for all public JWST NIRCam imaging data from the COSMOS-Web treasury program (up to 2023 June, totaling 0.28 deg2). We show that the NIRCam PSF has significant short-timescale temporal variations and random spatial variations in all f…
The CHARA Array Interferometric Program on the Multiplicity of Classical Be Stars: New Detections and Orbits of Stripped Subdwarf Companions
Gies, Douglas R.; Klement, Robert; Rivinius, Thomas +8 more
Rapid rotation and nonradial pulsations enable Be stars to build decretion disks, where the characteristic line emission forms. A major but unconstrained fraction of Be stars owe their rapid rotation to mass and angular momentum transfer in a binary. The faint, stripped companions can be helium-burning subdwarf OB-type stars (sdOBs), white dwarfs …
Cold Dark Matter and Self-interacting Dark Matter Interpretations of the Strong Gravitational Lensing Object JWST-ER1
Kong, Demao; Yang, Daneng; Yu, Hai-Bo
van Dokkum et al. reported the discovery of JWST-ER1, a strong lensing object at redshift z ≈ 2, using data from the James Webb Space Telescope. The lens mass within the Einstein ring is 5.9 times higher than the expected stellar mass from a Chabrier initial mass function, indicating a high dark matter density. In this work, we show that a cold da…
TESS Stellar Rotation up to 80 Days in the Southern Continuous Viewing Zone
van Saders, Jennifer L.; Claytor, Zachary R.; Beaton, Rachael L. +3 more
The Transiting Exoplanet Survey Satellite (TESS) mission delivers time-series photometry for millions of stars across the sky, offering a probe into stellar astrophysics, including rotation, on a population scale. However, light-curve systematics related to the satellite's 13.7 day orbit have prevented stellar rotation searches for periods longer …
Carnegie Supernova Project I and II: Measurements of H 0 Using Cepheid, Tip of the Red Giant Branch, and Surface Brightness Fluctuation Distance Calibration to Type Ia Supernovae
Gall, Christa; Ryder, Stuart D.; Morrell, Nidia +44 more
We present an analysis of Type Ia supernovae (SNe Ia) from the Carnegie Supernova Project I and II and extend the Hubble diagram from optical to near-infrared wavelengths (uBgVriYJH). We calculate the Hubble constant, H 0, using various distance calibrators: Cepheids, the tip of the red giant branch (TRGB), and surface brightness fluctu…