Search Publications
Early Results from GLASS-JWST. IX. First Spectroscopic Confirmation of Low-mass Quiescent Galaxies at z > 2 with NIRISS
Santini, Paola; Calabrò, Antonello; Castellano, Marco +20 more
How passive galaxies form, and the physical mechanisms which prevent star formation over long timescales, are some of the most outstanding questions in understanding galaxy evolution. The properties of quiescent galaxies over cosmic time provide crucial information to identify the quenching mechanisms. Passive galaxies have been confirmed and stud…
The stellar halo in Local Group Hestia simulations. II. The accreted component
Vogelsberger, Mark; Steinmetz, Matthias; Grand, Robert J. J. +12 more
Recent progress in understanding the assembly history of the Milky Way (MW) is driven by the tremendous amount of high-quality data delivered by Gaia (ESA), revealing a number of substructures potentially linked to several ancient accretion events. In this work we aim to explore the phase-space structure of accreted stars by analysing six M31/MW a…
TESS spots a mini-neptune interior to a hot saturn in the TOI-2000 system
Trifonov, Trifon; Henning, Thomas; Barclay, Thomas +52 more
Hot jupiters (P < 10 d, M > 60 M⊕) are almost always found alone around their stars, but four out of hundreds known have inner companion planets. These rare companions allow us to constrain the hot jupiter's formation history by ruling out high-eccentricity tidal migration. Less is known about inner companions to hot Saturn-mass p…
Gas-rich, Field Ultra-diffuse Galaxies Host Few Globular Clusters
Janowiecki, Steven; Sand, David J.; Leisman, Lukas +7 more
We present Hubble Space Telescope imaging of 14 gas-rich, low-surface-brightness galaxies in the field at distances of 25-36 Mpc, with mean effective radii and g-band central surface brightnesses of 1.9 kpc and 24.2 mag arcsec-2. Nine meet the standard criteria to be considered ultra-diffuse galaxies (UDGs). An inspection of point-like …
Mapping Protoplanetary Disk Vertical Structure with CO Isotopologue Line Emission
Wilner, David J.; Andrews, Sean M.; Bae, Jaehan +21 more
High-spatial-resolution observations of CO isotopologue line emission in protoplanetary disks at mid-inclinations (≈30°–75°) allow us to characterize the gas structure in detail, including radial and vertical substructures, emission surface heights and their dependencies on source characteristics, and disk temperature profiles. By combining observ…
Application of the Disk Instability Model to All Quasiperiodic Eruptions
Li, Shuang-Liang; Cao, Xinwu; Pan, Xin
After the first quasiperiodic eruption (QPE; GSN 069) was reported in 2019, four other sources have been identified as a QPE or a candidate. However, the physics behind QPEs is still unclear, although several models have been proposed. Pan et al. proposed an instability model for an accretion disk with magnetically driven outflows in the first QPE…
The impact of time-dependent stellar activity on exoplanet atmospheres
Loyd, R. O. Parke; France, Kevin; Tsai, Shang-Min +3 more
M-dwarfs are thought to be hostile environments for exoplanets. Stellar events are very common on such stars. These events might cause the atmospheres of exoplanets to change significantly over time. It is not only the major stellar flare events that contribute to this disequilibrium, but the smaller flares might also affect the atmospheres in an …
The SOUX AGN sample: optical/UV/X-ray SEDs and the nature of the disc
Done, Chris; Lusso, Elisabeta; Landt, Hermine +4 more
We use the SOUX sample of ~700 active galactic nucleus (AGN) to form average optical-ultraviolet (UV)-X-rays spectral energy distributions (SEDs) on a two-dimensional (2D) grid of MBH and L2500. We compare these with the predictions of a new AGN SED model, QSOSED, which includes prescriptions for both hot and warm Comptonizat…
A Unified Treatment of Kepler Occurrence to Trace Planet Evolution. I. Methodology
Dattilo, Anne; Batalha, Natalie M.; Bryson, Steve
We present Kepler exoplanet occurrence rates for planets between 0.5 and 16 R ⊕ and between 1 and 400 days. To measure occurrence, we use a nonparametric method via a kernel density estimator and use bootstrap random sampling for uncertainty estimation. We use a full characterization of completeness and reliability measurements from the…
A cosmic stream of atomic carbon gas connected to a massive radio galaxy at redshift 3.8
Lehnert, Matthew D.; De Breuck, Carlos; Mandelker, Nir +7 more
The growth of galaxies in the early Universe is driven by accretion of circum- and intergalactic gas. Simulations have predicted that steady streams of cold gas penetrate the dark matter halos of galaxies and provide the raw material necessary to sustain star formation. We report a filamentary stream of gas that extends for 100 kiloparsecs and con…