Search Publications
A High Incidence of Dusty Hα Emitters at z > 3 Among UltraVISTA Dropout Galaxies in COSMOS Revealed by JWST
Rinaldi, Pierluigi; Caputi, Karina I.; Ashby, Matthew L. N. +3 more
We have characterized 26 Spitzer/IRAC-selected sources from the SMUVS program that are undetected in the UltraVISTA DR5 H- and/or K s-band images, covering 94 arcmin2 of the COSMOS field, which have deep multiwavelength JWST photometry. We analyzed the JWST/NIRCam imaging from the PRIMER survey and ancillary HST data to revea…
Evidence for a Fast Soft X-Ray Wind in M82 from XMM-RGS
Boettcher, Erin; Hodges-Kluck, Edmund
Starburst wind models predict that metals and energy are primarily carried out of the disk by hot gas (T > 106 K), but the low energy resolution of X-ray CCD observations results in large uncertainties on the mass and energy loading. Here, we present evidence for a fast soft X-ray wind from the prototypical starburst galaxy M82 using…
Asteroseismic Inversions for Internal Sound Speed Profiles of Main-sequence Stars with Radiative Cores
Basu, Sarbani; Hekker, Saskia; Christensen-Dalsgaard, Jørgen +3 more
The theoretical oscillation frequencies of even the best asteroseismic models of solar-like oscillators show significant differences from observed oscillation frequencies. Structure inversions seek to use these frequency differences to infer the underlying differences in stellar structure. While used extensively to study the Sun, structure inversi…
Chandra X-Ray Observatory Observations of 13 Fermi LAT Sources
Kargaltsev, Oleg; Yang, Hui; Hare, Jeremy +3 more
In the latest data release from the Fermi Gamma-ray Space Telescope (the 4th Fermi LAT 14 yr Catalog, or 4FGL), more than 50% of the Galactic sources are yet to be identified. We observed 13 unidentified Fermi LAT sources with the Chandra X-Ray Observatory to explore their nature. We report the results of the classification of X-ray sources in the…
Generalized Rotation Curves of the Milky Way from the GAIA DR3 Data Set: Constraints on Mass Models
Sylos Labini, Francesco
The circular velocity curve traced by stars provides a direct means of investigating the potential and mass distribution of the Milky Way. Recent measurements of the Galaxy's rotation curve have revealed a significant decrease in velocity for Galactic radii larger than approximately 15 kpc. While these determinations have primarily focused on the …
Atmospheric Retrievals of the Phase-resolved Spectra of Irradiated Brown Dwarfs WD-0137B and EPIC-2122B
Lothringer, Joshua D.; Apai, Dániel; Parmentier, Vivien +3 more
We present an atmospheric retrieval analysis of Hubble Space Telescope/Wide Field Camera 3/G141 spectroscopic phase curve observations of two brown dwarfs, WD-0137B and EPIC-2122B, in ultrashort period orbits around white dwarf hosts. These systems are analogous to hot and ultra-hot Jupiter systems, enabling a unique and high-precision comparison …
AstroSat and Insight-HXMT Observations of the Long-period X-Ray Pulsar 4U 2206+54
Wang, Wei; Epili, Prahlad R.
We report the timing and spectral studies of the accreting X-ray pulsar 4U 2206+54 using AstroSat and Insight-HXMT observations taken in 2016 and 2020 respectively. X-ray pulsations from the system are detected by both missions. The AstroSat discovered a significant periodic signal at ∼5619 s in 2016, and Insight-HXMT found a pulsation period at ∼…
Wind-line Variability and Intrinsic Errors in Observational Mass-loss Rates
Massa, Derck; Oskinova, Lidia M.; Prinja, Raman K.
UV wind-line variability in OB stars appears to be universal. In order to quantify this variation and to estimate its effect on a mass-loss rate determined from a single observation, we use the International Ultraviolet Explorer archive to identify nonpeculiar OB stars with well-developed but unsaturated Si IV λ1400 doublets and at least 10 indepe…
The Massive and Distant Clusters of WISE Survey 2: A Stacking Analysis Investigating the Evolution of Star Formation Rates and Stellar Masses in Groups and Clusters
Alberts, Stacey; Connor, Thomas; Eisenhardt, Peter R. M. +8 more
The evolution of galaxies depends on their masses and local environments; understanding when and how environmental quenching starts to operate remains a challenge. Furthermore, studies of the high-redshift regime have been limited to massive cluster members, owing to sensitivity limits or small fields of view when the sensitivity is sufficient, in…
Lessons from Hubble and Spitzer: 1D Self-consistent Model Grids for 19 Hot Jupiter Emission Spectra
Fortney, Jonathan J.; Line, Michael R.; Mansfield, Megan +4 more
We present a population-level analysis of the dayside thermal emission spectra of 19 planets observed with Hubble WFC3 and Spitzer IRAC 3.6 and 4.5 µm, spanning equilibrium temperatures 1200–2700 K and 0.7–10.5 Jupiter masses. We use grids of planet-specific 1D, cloud-free, radiative–convective–thermochemical equilibrium models (1D-RCTE) com…