Search Publications
Narrow absorption line outflow in Seyfert 1 galaxy J1429+4518: outflow's distance from the central source and its energetics
Arav, N.; Dehghanian, M.; Walker, G. +2 more
In the Hubble Space Telescope/Cosmic Origins Spectrograph spectrum of the Seyfert 1 galaxy 2MASX J14292507+4518318, we have identified a narrow absorption line outflow system with a velocity of -151 km s-1. This outflow exhibits absorption troughs from the resonance states of ions like C IV, N V, S IV, and Si II, as well as excited stat…
The HST Nondetection of SN Ia 2011fe 11.5 yr after Explosion Further Restricts Single-degenerate Progenitor Systems
Shappee, B. J.; Tucker, M. A.
We present deep Hubble Space Telescope imaging of the nearby Type Ia supernova (SN Ia) 2011fe obtained 11.5 yr after explosion. No emission is detected at the SN location to a 1σ (3σ) limit of F555W > 30.2 (29.0) mag, or equivalently M V > 1.2 (‑0.1) mag, neglecting the distance uncertainty to M101. We constrain the presence of …
Searching for magnetar binaries disrupted by core-collapse supernovae
El-Badry, Kareem; Connor, Liam; Sharma, Kritti +5 more
Core-collapse supernovae (CCSNe) are considered the primary magnetar formation channel, with 15 magnetars associated with supernova remnants (SNRs). A large fraction of these should occur in massive stellar binaries that are disrupted by the explosion, meaning that $\sim 45~{{\ \rm per\ cent}}$ of magnetars should be nearby high-velocity stars. He…
Pulsar-based map of galactic acceleration
Moran, Abigail; Mingarelli, Chiara M. F.; Van Tilburg, Ken +1 more
Binary pulsars can be used to probe Galactic potential gradients through calculating their line-of-sight accelerations. We present the first data release of direct line-of-sight acceleration measurements for 29 binary pulsars. We validate these data with a local acceleration model, and compare our results to those from earlier works. We find evide…
Front-row Seat of the Recent R Aqr Periastron Passage: X-Ray Multiepoch Spectral and Spatial Analysis
Raymond, John; Sacchi, Andrea; Karovska, Margarita +7 more
We report on the X-ray spectral and spatial evolution of the symbiotic star R Aqr. Through a multiepoch observational campaign performed with Chandra between 2017 and 2022, we study the X-ray emission of this binary system, composed of an evolved red giant star and a white dwarf (WD). This analysis is particularly timely as the WD approached the p…
The Milky Way tomography with Subaru Hyper Suprime-Cam. I. Halo substructures
Komiyama, Yutaka; Takada, Masahiro; Tanaka, Masayuki +7 more
We analyze the photometric data in the Wide layer of the Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP) over ~1200 deg2 to uncover new halo substructures beyond the distance, D⊙ ~ 30 kpc, from the Sun. For this purpose, we develop an isochrone filter for an old, metal-poor stellar system to extract the faint main-sequen…
Star formation in extreme environments: A 200 pc high velocity gas stream in the Galactic centre
Menten, K. M.; Schilke, P.; Fuller, G. A. +9 more
Context. The expanding molecular ring (EMR) manifests itself as a parallelogram in the position-velocity diagram of spectral line emission from the Central Molecular Zone (CMZ) surrounding the Galactic centre (GC). It is a high velocity (| VLSR | > 100 km s‑1) extended molecular gas structure. The formation of the EMR is b…
The missing radial velocities of Gaia: a catalogue of Bayesian estimates for DR3
Widmark, Axel; Naik, Aneesh P.
In an earlier work, we demonstrated the effectiveness of Bayesian neural networks in estimating the missing line-of-sight velocities of Gaia stars, and published an accompanying catalogue of blind predictions for the line-of-sight velocities of stars in Gaia DR3. These were not merely point predictions, but probability distributions reflecting our…
Implementation of Aerosol Mie Scattering in POSEIDON with Application to the Hot Jupiter HD 189733 b's Transmission, Emission, and Reflected Light Spectrum
MacDonald, Ryan J.; Lewis, Nikole K.; Mullens, Elijah
Aerosols are a ubiquitous feature of planetary atmospheres and leave clear spectral imprints in exoplanet spectra. Pre-JWST, exoplanet retrieval frameworks mostly adopted simple parametric approximations. With JWST, we now have access to mid-infrared wavelengths where aerosols have detectable composition-specific resonance features. Here, we imple…
A VLITE Search for Millisecond Pulsars in Globular Clusters: Discovery of a Pulsar in GLIMPSE-C01
Freire, Paulo C. C.; Ransom, Scott M.; Maccarone, Thomas J. +8 more
We present results from a search for pulsars in globular clusters, including the discovery of a new millisecond pulsar in the stellar cluster GLIMPSE-C01. We searched for low-frequency radio sources within 97 globular clusters using images from the VLA Low-band Ionosphere and Transient Experiment (VLITE) and epochs 1 and 2 of the VLITE Commensal S…