Search Publications
Optical Identification of the Shortest-period Spider Pulsar System M71E
Dong, Subo; Liu, Zhuokai
M71E is a spider pulsar (i.e., a millisecond pulsar with a tight binary companion) with the shortest known orbital period of P = 53.3 minutes, which was discovered by Pan et al. Their favored evolutionary model suggests that it bridges between two types of spider pulsars, namely, it descended from a "redback" and will become a "black widow." Using…
Nonextensive Behavior of Stellar Rotation in the Galactic Disk Components
da Silva, M. P.; do Nascimento, J. -D.; de Lima, M. M. F. +1 more
The solar neighborhood is a unique stellar astrophysical laboratory formed by a variety of stars from different origins. In particular, two of the most notable populations known are the thick and thin disk stars, each characterized by distinct chemical compositions, ages, kinematics, and origins. Based on Tsallis nonextensive statistics, we invest…
The GeMS/GSAOI Galactic Globular Cluster Survey (G4CS). II. Characterization of 47 Tuc with Bayesian Statistics
Dotter, Aaron; Monty, Stephanie; Puzia, Thomas H. +5 more
We present a photometric analysis of globular cluster 47 Tuc (NGC 104) using near-IR imaging data from the GeMS/GSAOI Galactic Globular Cluster Survey (G4CS), which is in operation at Gemini-South telescope. Our survey is designed to obtain AO-assisted deep imaging with near diffraction-limited spatial resolution of the central fields of Milky Way…
Does Turbulence along the Coronal Current Sheet Drive Ion Cyclotron Waves?
Telloni, Daniele; Zank, Gary P.; Adhikari, Laxman +32 more
Evidence for the presence of ion cyclotron waves (ICWs), driven by turbulence, at the boundaries of the current sheet is reported in this paper. By exploiting the full potential of the joint observations performed by Parker Solar Probe and the Metis coronagraph on board Solar Orbiter, local measurements of the solar wind can be linked with the lar…
Spacecraft Charging Simulations of Probe B1 of Comet Interceptor during the Cometary Flyby
Henri, P.; Miyake, Y.; Johansson, F. L. +2 more
Comet Interceptor will be the first mission to make a flyby of a long-period or interstellar comet. After launch, the spacecraft will wait at the Sun-Earth Lagrange point L2 for a yet-to-be-discovered comet to appear. The mission comprises three spacecraft: One main spacecraft, A, developed by ESA, and two subprobes, B1 and B2, developed by JAXA a…
XMM-Newton and Chandra Observations of the Candidate Fermi-LAT Pulsar 4FGL J1015.5-6030
Pavlov, George G.; Kargaltsev, Oleg; Younes, George +2 more
4FGL J1015.5-6030 is an unidentified Fermi-LAT source hosting a bright, extended X-ray source whose X-ray spectrum is consistent with that of a young pulsar, yet no pulsations have been found. Here we report on XMM-Newton timing and Chandra imaging observations of the X-ray counterpart of 4FGL J1015.5-6030. We find no significant periodicity from …
Multiple Populations in Low-mass Globular Clusters: Eridanus
Li, Chengyuan; Baumgardt, Holger; Geisler, Doug +5 more
Multiple populations (MPs), characterized by variations in light elemental abundances, have been found in stellar clusters in the Milky Way, Magellanic Clouds, as well as several other dwarf galaxies. Based on a large number of observations, mass has been suggested to be a key parameter affecting the presence and appearance of MPs in stellar clust…
Mass Ratio Distribution of Hierarchical Triple Systems from the LAMOST-MRS Survey
Han, Zhanwen; Chen, Xuefei; Li, Jiangdan +3 more
Hierarchical triple-star systems consists of three components organized into an inner binary (M 1, M 2) and a more distant outer tertiary (M 3) star. The LAMOST Medium-Resolution Spectroscopic Survey has offered a great sample for the study of triple-system populations. We used the peak amplitude ratio method to ob…
RZ Piscium Hosts a Compact and Highly Perturbed Debris Disk
Hughes, A. Meredith; Liu, Hauyu Baobab; Rieke, G. H. +6 more
RZ Piscium (RZ Psc) is well known in the variable star field because of its numerous irregular optical dips in the past 5 decades, but the nature of the system is heavily debated in the literature. We present multiyear infrared monitoring data from Spitzer and WISE to track the activities of the inner debris production, revealing stochastic infrar…
Simultaneous Estimates of Star-cluster Age, Metallicity, Mass, and Extinction (SESAMME). I. Presenting an MCMC Approach to Spectral Stellar Population Fitting
Hernandez, Svea; Smith, Linda J.; Aloisi, Alessandra +3 more
We present the first version release of SESAMME, a public, Python-based full spectrum fitting tool for Simultaneous Estimates of Star-cluster Age, Metallicity, Mass, and Extinction. SESAMME compares an input spectrum of a star cluster to a grid of stellar population models with an added nebular continuum component, using Markov Chain Monte Carlo m…