Search Publications
SCExAO/CHARIS Spectroscopic Characterization of Cloudy L/T Transition Companion Brown Dwarf HIP 93398 B
Jensen-Clem, Rebecca; Salama, Maïssa; Lewis, Briley L. +10 more
Brown dwarfs with measured dynamical masses and spectra from direct imaging are benchmarks that anchor substellar atmosphere cooling and evolution models. We present Subaru SCExAO/CHARIS infrared spectroscopy of HIP 93398 B, a brown dwarf companion recently discovered by Y. Li et al. (2023), as part of an informed survey using the Hipparcos–Gaia C…
Near-infrared Spectroscopy for Remote Sensing of Porosity, Density, and Cubicity of Crystalline and Amorphous H2O Ices in Astrophysical Environments
Tonauer, Christina M.; Köck, Eva-Maria; Henn, Raphael +8 more
We present laboratory spectra of pure amorphous and crystalline H2O ices in the near-infrared (NIR, 1–2.5 µm/10,000–4000 cm‑1) at 80–180 K. The aim of this study is to provide spectroscopic reference data that allow remotely accessing ice properties for icy objects such as icy moons, cometary ice, or Saturn rings. Speci…
Evidence for Type Ib/c Origin of the Supernova Remnant G292.0+1.8
Katsuda, Satoru; Sato, Toshiki; Uchida, Hiroyuki +6 more
Circumstellar material (CSM) produced by mass loss from massive stars (≳10 M ⊙) through strong stellar winds or binary stripping provides rich information for understanding progenitors of core-collapse supernova remnants. In this paper we present a grating spectroscopy of a Galactic SNR G292.0+1.8, which is claimed to be a Type Ib/c rem…
Probing Velocity Dispersion Inside Coronal Mass Ejections: New Insights on Their Initiation
Mierla, Marilena; Reiss, Martin A.; Banerjee, Dipankar +4 more
This work studies the kinematics of the leading edge and the core of six coronal mass ejections (CMEs) in the combined field of view of Sun Watcher using Active Pixel System detector and Image Processing (SWAP) on board PRoject for On-Board Autonomy (PROBA-2) and the ground-based K-Cor coronagraph of the Mauna Loa Solar Observatory. We report, for…
Radial Distribution of Electron Quasi-thermal Noise in the Inner Heliosphere
Chen, Ling; Li, Yi-Lun; Wu, De-Jin
The electron population in the solar wind plasma can be described with three different components: a core, a halo, and a magnetic field aligned strahl. The electron quasi-thermal noise (QTN) is investigated by using an electron population model consisting of a core with a Maxwellian distribution and a halo with a kappa distribution, based on the e…
Soft X-Ray Energy Spectra in the Wide-field Galactic Disk Area Revealed with HaloSat
Kaaret, Philip; Angelini, Lorella; Mitsuishi, Ikuyuki +3 more
We analyzed data from HaloSat observations for five fields in the Galactic disk located far away from the Galactic center (135° < l < 254°) to understand the nature of soft X-ray energy emission in the Galactic disk. The fields have 14° diameter and were selected to contain no significant high-flux X-ray sources. All five HaloSat soft X-ray …
A Radio-loud Semiregular Variable
Luque-Escamilla, Pedro L.; Martí, Josep
As a byproduct of our search for Galactic stellar systems with gamma-ray emission, we have identified an unrelated cool and evolved star (IRC-10412) that attracted our attention due to its strong radio emission level with a spectral index matching, almost perfectly, the canonical +0.6 value expected from an ionized stellar wind. A follow-up observ…
Historical Fermi All-sky Variability Analysis of Galactic Flares
Ajello, M.; Buehler, R.; Kocevski, D. +2 more
The Fermi All-sky Variability Analysis (FAVA) provides a photometric alternative for identifying week-long gamma-ray flares across the entire sky while being independent of any diffuse Galactic or isotropic emission model. We reviewed 779 weeks of Fermi Large Area Telescope data analyzed by FAVA to estimate the rate and origin of Galactic gamma-ra…
A Multiwavelength Approach to Constraining the Merger Properties of ACT-CL J0034.4+0225
Hilton, Matt; Sifón, Cristóbal; Hughes, John P. +10 more
ACT-CL J0034.4+0225 is a previously unrecognized merging galaxy cluster at z = 0.38588 ± 0.00068. Our primary evidence is provided by a 21 ks Chandra image that shows two surface brightness peaks separated by ∼49″ (259 kpc) surrounded by an extended cluster gas distribution. Each gas peak contains a brightest cluster galaxy, offset from the gas pe…
Escape Velocity Mass of A1063
Miller, Christopher J.; Kremin, Anthony; Rodriguez, Alexander +1 more
We measure the radius–velocity phase-space edge profile of A1063 using galaxy redshifts from Karman et al. and Mercurio et al. Combined with a cosmological model and after accounting for interlopers and sampling effects, we infer the escape velocity profile. Using the Poisson equation, we then directly constrain the gravitational potential profile…