Search Publications
Uncertain times: the redshift-time relation from cosmology and stars
Weisz, Daniel R.; Boylan-Kolchin, Michael
Planck data provide precise constraints on cosmological parameters when assuming the base ΛCDM model, including a 0.17 per cent measurement of the age of the Universe, $t_0=13.797 \pm 0.023\, {\rm Gyr}$. However, the persistence of the 'Hubble tension' calls the base ΛCDM model's completeness into question and has spurred interest in models such a…
Rotation and Lithium Confirmation of a 500 pc Halo for the Open Cluster NGC 2516
Winn, J. N.; Bouma, L. G.; Bakos, G. Á. +2 more
Recent analyses of the Gaia data have identified diffuse stellar populations surrounding nearby open clusters. It is important to verify that these "halos," "tails," and "strings" are of similar ages and compositions as stars in the denser part of the cluster. We present an analysis of NGC 2516 (≈150 Myr), which has a classical tidal radius of 10 …
Outflows from Super Star Clusters in the Central Starburst of NGC 253
Meier, David S.; Ott, Jürgen; Lenkić, Laura +13 more
Young massive clusters play an important role in the evolution of their host galaxies, and feedback from the high-mass stars in these clusters can have profound effects on the surrounding interstellar medium. The nuclear starburst in the nearby galaxy NGC 253 at a distance of 3.5 Mpc is a key laboratory in which to study star formation in an extre…
Observational Signature of Tightly Wound Spirals Driven by Buoyancy Resonances in Protoplanetary Disks
Bae, Jaehan; Teague, Richard; Zhu, Zhaohuan
Besides the spirals induced by the Lindblad resonances, planets can generate a family of tightly wound spirals through buoyancy resonances. The excitation of buoyancy resonances depends on the thermal relaxation timescale of the gas. By computing timescales of various processes associated with thermal relaxation, namely, radiation, diffusion, and …
The properties of polycyclic aromatic hydrocarbons in galaxies: constraints on PAH sizes, charge and radiation fields
Rigopoulou, D.; Pereira-Santaella, M.; Alonso-Herrero, A. +7 more
Based on theoretical spectra computed using Density Functional Theory we study the properties of polycyclic aromatic hydrocarbons (PAH). In particular using bin-average spectra of PAH molecules with varying number of carbons we investigate how the intensity of the mid-infrared emission bands, 3.3, 6.2, 7.7, and 11.3 $\mu$m, respond to changes in t…
A Population of Heavily Reddened, Optically Missed Novae from Palomar Gattini-IR: Constraints on the Galactic Nova Rate
Soria, Roberto; Tinyanont, Samaporn; De, Kishalay +25 more
The nova rate in the Milky Way remains largely uncertain, despite its vital importance in constraining models of Galactic chemical evolution as well as understanding progenitor channels for Type Ia supernovae. The rate has been previously estimated to be in the range of ≈10-300 yr-1, either based on extrapolations from a handful of very…
The vertical structure of CO in the Martian atmosphere from the ExoMars Trace Gas Orbiter
Forget, F.; Montmessin, F.; Korablev, O. +11 more
Carbon monoxide (CO) is the main product of CO2 photolysis in the Martian atmosphere. Production of CO is balanced by its loss reaction with OH, which recycles CO into CO2. CO is therefore a sensitive tracer of the OH-catalysed chemistry that contributes to the stability of CO2 in the atmosphere of Mars. To date, C…
An Ab Initio Approach to Antiproton Modulation in the Inner Heliosphere
Engelbrecht, N. Eugene; Moloto, K. D.
Recent advances in the detection of cosmic-ray (CR) antiproton intensities at Earth have the potential to provide valuable new insights in the search for dark matter. As such, a fuller understanding of the modulation of these particles due to the influence of the Sun is of vital importance. Valuable insights can be gained through the study of gala…
The Infrared Emission and Vigorous Star Formation of Low-redshift Quasars
Ho, Luis C.; Zhuang, Ming-Yang; Shangguan, Jinyi +1 more
The star formation activity of the host galaxies of active galactic nuclei provides valuable insights into the complex interconnections between black hole growth and galaxy evolution. A major obstacle arises from the difficulty of estimating accurate star formation rates (SFRs) in the presence of a strong active galactic nucleus. Analyzing the 1-5…
TOI-2076 and TOI-1807: Two Young, Comoving Planetary Systems within 50 pc Identified by TESS that are Ideal Candidates for Further Follow Up
Vanderburg, Andrew; Lester, Kathryn V.; Bieryla, Allyson +47 more
We report the discovery of two planetary systems around comoving stars: TOI-2076 (TIC 27491137) and TOI-1807 (TIC 180695581). TOI-2076 is a nearby (41.9 pc) multiplanetary system orbiting a young (204 ± 50 Myr), bright (K = 7.115 in TIC v8.1) start. TOI-1807 hosts a single transiting planet and is similarly nearby (42.58 pc), similarly young (180 …