Search Publications
A Photoionization Model for the Infrared Coronal Line Emission in the Classical Nova V1716 Scorpii
Evans, A.; Starrfield, S.; Page, K. L. +2 more
A near-infrared spectrum of nova V1716 Scorpii (PNV J17224490-4137160), a recent bright (
Are WASP-107-like Systems Consistent with High-eccentricity Migration?
Dai, Fei; Yu, Hang
WASP-107 b seems to be a poster child of the long-suspected high-eccentricity migration scenario. It is on a 5.7 day, polar orbit. The planet is Jupiter-like in radius but Neptune-like in mass with exceptionally low density. WASP-107 c is on a 1100 day, e = 0.28 orbit with at least Saturn mass. Planet b may still have a residual eccentricity of 0.…
X-Rays from RS Ophiuchi's 2021 Eruption: Shocks In and Out of Ionization Equilibrium
Sokoloski, J. L.; Mukai, Koji; Islam, Nazma
The recurrent nova RS Ophiuchi (RS Oph) underwent its most recent eruption on 2021 August 8 and became the first nova to produce both detectable GeV and TeV emission. We used extensive X-ray monitoring with the Neutron Star Interior Composition Explorer Mission (NICER) to model the X-ray spectrum and probe the shock conditions throughout the 2021 …
The Atmosphere of HD 149026b: Low Metal Enrichment and Weak Energy Transport
Fortney, Jonathan J.; Batalha, Natasha E.; Mukherjee, Sagnick +1 more
Recent JWST eclipse spectra of the high-density hot Saturn HD 149026b between 2.35 and 5.08 µm have allowed for in-depth study of its atmosphere. To understand its atmospheric properties, we have created a grid of 1D radiative-convective–thermochemical–equilibrium atmosphere models and spectra with PICASO 3.0. In agreement with previous work…
Synthetic Gaia DR3 Surveys from the FIRE Cosmological Simulations of Milky Way-mass Galaxies
Sanderson, Robyn; Wetzel, Andrew; Necib, Lina +4 more
The third data release (DR3) of Gaia has provided a fivefold increase in the number of radial velocity measurements of stars, as well as a stark improvement in parallax and proper motion measurements. To help with studies that seek to test models and interpret Gaia DR3, we present nine Gaia synthetic surveys, based on three solar positions in thre…
Protosolar D-to-H Abundance and One Part per Billion PH3 in the Coldest Brown Dwarf
Fortney, Jonathan J.; Apai, Dániel; Marley, Mark +24 more
The coldest Y spectral type brown dwarfs are similar in mass and temperature to cool and warm (∼200–400 K) giant exoplanets. We can therefore use their atmospheres as proxies for planetary atmospheres, testing our understanding of physics and chemistry for these complex, cool worlds. At these cold temperatures, their atmospheres are cold enough fo…
eDIG-CHANGES. II. Project Design and Initial Results on NGC 3556
Bregman, Joel N.; Li, Hui; Martini, Paul +19 more
The extraplanar diffuse ionized gas (eDIG) represents ionized gases traced by optical/UV lines beyond the stellar extent of galaxies. We herein introduce a novel multislit narrow-band spectroscopy method to conduct spatially resolved spectroscopy of the eDIG around a sample of nearby edge-on disk galaxies (eDIG-CHANGES). In this paper, we introduc…
Kinematics of Supernova Remnants Using Multiepoch Maximum Likelihood Estimation: Chandra Observation of Cassiopeia A as an Example
Sato, Toshiki; Yamada, Shinya; Sakai, Yusuke +2 more
Decadal changes in a nearby supernova remnant (SNR) were analyzed using a multiepoch maximum likelihood estimation (MLE) approach. To achieve greater accuracy in capturing the dynamics of SNRs, kinematic features and point-spread function effects were integrated into the MLE framework. Using Cassiopeia A as a representative example, data obtained …
Fast Outflows and Luminous He II Emission in Dwarf Galaxies with Active Galactic Nuclei (AGN)
Tripp, Todd M.; Hamann, Fred; Veilleux, Sylvain +6 more
While stellar processes are believed to be the main source of feedback in dwarf galaxies, the accumulating discoveries of active galactic nuclei (AGN) in dwarf galaxies over recent years arouse the interest to also consider AGN feedback in them. Fast, AGN-driven outflows, a major mechanism of AGN feedback, have indeed been discovered in dwarf gala…
VLA FRAMEx. I. Wideband Radio Properties of the AGN in NGC 4388
Fischer, Travis C.; Secrest, Nathan J.; Johnson, Megan C. +5 more
We present the first results from Karl G. Jansky Very Large Array (VLA) observations as a part of the Fundamental Reference Active Galactic Nucleus (AGN) Monitoring Experiment, a program to understand the relationship between AGN accretion physics and wavelength-dependent position as a function of time. With this VLA survey, we investigate the rad…