Search Publications
Determining the Nature of IC 10 X-2: A Comprehensive Study of the Optical/IR Emission from an Extragalactic BeHMXB
Gelfand, Joseph D.; Heinke, Craig; Lewis, Fraser +7 more
We present a comprehensive analysis of the optical and infrared (IR) properties of high-mass X-ray binary (HMXB) IC 10 X-2, classified as a supergiant HMXB and superfast X-ray transient by previous work. Our analysis of regular (daily and weekly) observations by both the Zwicky Transient Facility and Las Cumbres Observatory over a 5 yr period indi…
Calibration of Complementary Metal-oxide-semiconductor Sensor–based Photometry to a Few-millimagnitude Precision: The Case of the Mini-SiTian Array
Huang, Yang; Liu, Jifeng; Beers, Timothy C. +14 more
We present a pioneering achievement in the high-precision photometric calibration of CMOS-based photometry, by application of the Gaia Blue Photometer or Red Photometer (XP) spectra–based synthetic photometry method to the mini-SiTian array (MST) photometry. Through 79 repeated observations of the f02 field on the night, we find good internal cons…
PSR J1231–1411 Revisited: Pulse Profile Analysis of X-Ray Observation
Tao, Lian; Feng, Hua; Zhang, Shu +14 more
One of the primary goals of Neutron Star Interior Composition Explorer (NICER)-like X-ray missions is to impose stringent constraints on the neutron star equation of state by precisely measuring their masses and radii. NICER has recently expanded the data set of inferred mass–radius relations for neutron stars, including four rotation-powered mill…
Segue 2 Recently Collided with the Cetus-Palca Stream: New Opportunities to Constrain Dark Matter in an Ultra-faint Dwarf
Conroy, Charlie; Price-Whelan, Adrian M.; Bonaca, Ana +7 more
Stellar streams in the Milky Way are promising detectors of low-mass dark matter (DM) subhalos predicted by ΛCDM. Passing subhalos induce perturbations in streams that indicate the presence of the subhalos. Understanding how known DM-dominated satellites impact streams is a crucial step toward using stream perturbations to constrain the properties…
Unusual X-Ray Oxygen Line Ratios of SN 1987A Arising from the Absorption of Galactic Hot Interstellar Medium
Greco, Emanuele; Vink, Jacco; Miceli, Marco +5 more
Recent high-resolution X-ray spectroscopic studies have revealed unusual oxygen line ratios, such as the high O VII forbidden-to-resonance ratio, in several supernova remnants. While the physical origin is still under debate, for most of them it has been suggested that this phenomenon arises from either charge exchange (CX) or resonant scattering …
The Structure of the Molecular Envelope of the Ring Nebula (NGC 6720)
Wilner, David J.; De Marco, Orsola; Kastner, Joel H. +5 more
We present the first interferometric imaging of molecular line emission from the Ring Nebula, NGC 6720, in the form of Submillimeter Array (SMA) observations of CO J = 2 → 1 emission. The SMA 12CO(2–1) mapping data, with ∼3″ spatial resolution and 2 km s‑1 velocity resolution, provide an unprecedentedly detailed, 3D view of t…
Introducing the Condor Array Telescope. VI. Discovery of Extensive Ionized Gaseous Filaments of the Cosmic Web in the Direction of the M81 Group
Walter, Frederick M.; Shara, Michael M.; Lanzetta, Kenneth M. +3 more
We used the Condor Array Telescope to obtain deep imaging observations through luminance broadband and He II, [O III], He I, Hα, [N II], and [S II] narrowband filters of an extended region of the M81 Group spanning ≈8 × 8 deg2 on the sky centered near M81 and M82. Here, we report aspects of these observations that are specifically relat…
TOI-4504: Exceptionally Large Transit Timing Variations Induced by Two Resonant Warm Gas Giants in a Three-planet System
Trifonov, Trifon; Henning, Thomas; Vanderburg, Andrew +24 more
We present a joint analysis of transit timing variations (TTVs) and Doppler data for the transiting exoplanet system TOI-4504. TOI-4504 c is a warm Jupiter-mass planet that exhibits the largest known TTVs, with a peak-to-node amplitude of ∼2 days, the largest value ever observed, and a superperiod of ~930 days. TOI-4504 b and c were identified in …
Identifying Galactic Substructures in 5D Space Using All-sky RR Lyrae Stars in Gaia DR3
Liu, Gaochao; Huang, Yang; Rix, Hans-Walter +9 more
Motivated by the vast gap between photometric and spectroscopic data volumes, there is great potential in using 5D kinematic information to identify and study substructures of the Milky Way. We identify substructures in the Galactic halo using 46,575 RR Lyrae stars (RRLs) from Gaia Data Release 3, with photometric metallicities and distances newly…
A Data-driven M Dwarf Model and Detailed Abundances for ∼17,000 M Dwarfs in SDSS-V
Cunha, Katia; Souto, Diogo; Angus, Ruth +5 more
The cool temperatures of M dwarf atmospheres enable complex molecular chemistry, making robust characterization of M dwarf compositions a long-standing challenge. Recent modifications to spectral synthesis pipelines have enabled more accurate modeling of M dwarf atmospheres, but these methods are too slow for characterizing more than a handful of …