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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…
Characterisation of the upper atmospheres of HAT-P-32 b, WASP-69 b, GJ 1214 b, and WASP-76 b through their He I triplet absorption
Sánchez-López, A.; López-Puertas, M.; Amado, P. J. +14 more
Characterisation of atmospheres undergoing photo-evaporation is key to understanding the formation, evolution, and diversity of planets. However, only a few upper atmospheres that experience this kind of hydrodynamic escape have been characterised. Our aim is to characterise the upper atmospheres of the hot Jupiters HAT-P-32b and WASP-69 b, the wa…
A Mars orbital catalog of aqueous alteration signatures (MOCAAS)
Bibring, Jean-Pierre; Langevin, Yves; Gondet, Brigitte +3 more
We describe the completion of the MOCAAS project providing a global repository of secondary minerals formed through interaction with water on Mars. This work is based on the analysis of orbital imaging spectroscopy data from the OMEGA/Mars Express and CRISM/MRO near-infrared instruments. A database and a set of high-resolution global maps (200 m/p…
Minor Merger Growth in Action: JWST Detects Faint Blue Companions around Massive Quiescent Galaxies at 0.5 ≤ z ≤ 3.0
Carniani, Stefano; Übler, Hannah; D'Eugenio, Francesco +17 more
Minor mergers are thought to drive the structural evolution of massive quiescent galaxies; however, existing Hubble Space Telescope (HST) imaging is primarily sensitive to stellar mass ratios ≳1:10. Here, we report the discovery of a large population of low-mass companions within 35 kpc of known $\mathrm{log}{M}_{* }/{M}_{\odot }\gtrsim 10.5$ quie…