Search Publications
Elemental Abundances in the Diffuse Interstellar Medium from Joint Far-ultraviolet and X-Ray Spectroscopy: Iron, Oxygen, Carbon, and Sulfur
Costantini, E.; Mehdipour, M.; García, J. A. +10 more
In this study, we investigate interstellar absorption lines along the line of sight toward the galactic low-mass X-ray binary Cygnus X-2. We combine absorption line data obtained from high-resolution X-ray spectra collected with the Chandra and XMM-Newton satellites, along with far-UV absorption lines observed by the Hubble Space Telescope's (HST)…
Firmamento: A Multimessenger Astronomy Tool for Citizen and Professional Scientists
Giommi, Paolo; Doro, Michele; Pollock, A. M. T. +12 more
Firmamento (https://firmamento.hosting.nyu.edu) is a new-concept, web-based, and mobile-friendly data analysis tool dedicated to multifrequency/multimessenger emitters, as exemplified by blazars. Although initially intended to support a citizen researcher project at New York University–Abu Dhabi, Firmamento has evolved to be a valuable tool for pr…
Fast and Robust Noise Background Modeling and Quasiperiodic Oscillation Detection for Astronomical Time Series
Xu, Chang
Spectrum with confidence levels is a commonly used method for quasiperiodic oscillation (QPO) detection, but it is prone to yield false positives for two reasons: poor choice and/or biased modeling of the null hypothesis (or noise background). Motivated by this, we propose a new time-domain maximum-likelihood estimation method, which can quickly a…
Extinction of Taurus, Orion, Perseus and California Molecular Clouds Based on the LAMOST, 2MASS, and Gaia Surveys. II. The Extinction Law
Wang, Shu; Jiang, Biwei; Li, Jun +1 more
The extinction law from ultraviolet (UV) to infrared (IR; 0.2–24 µm) is determined by relying on the blue-edge method and color-excess ratios for some nearby molecular clouds, from the low-mass star-forming region to the massive star-forming region. The observational data are collected from nine photometric surveys, along with stellar parame…
Demography of Stellar Radio Population within 500 pc: A VLASS-Gaia DR3 Study
Narang, Mayank; Tyagi, H.; Shridharan, B. +5 more
In this work, we have carried out a systematic analysis of the Very Large Array Sky Survey (VLASS) quick look catalogs together with Gaia DR3 to identify the optical counterparts of 3 GHz radio emitters within 500 pc to obtain a homogeneous statistical sample of stellar radio sources. We have identified distinct populations of 3 GHz emitters acros…
Detecting Exoplanet Transits with the Next Generation of X-Ray Telescopes
Cilley, Raven; King, George W.; Corrales, Lía
Detecting exoplanet transits at X-ray wavelengths would provide a window into the effects of high-energy irradiation on the upper atmospheres of planets. However, stars are relatively dim in the X-ray, making exoplanet transit detections difficult with current X-ray telescopes. To date, only one exoplanet (HD 189733 b) has an X-ray transit detecti…
A Phenomenon Resembling Early Superhumps in a New SU UMa-type Dwarf Nova with a 2 hr Orbital Period
Garnavich, Peter; Littlefield, Colin; Szkody, Paula +4 more
We investigate K2BS5, an optical transient that we identified in Campaign 13 of the Kepler/K2 archives by the K2 Background Survey, and classify it as a new SU UMa-type dwarf nova. Using the light curve generated from Keplers long-cadence observation mode, we analyze the dwarf nova during quiescence and superoutburst. Following 20 days of quiescen…
Joint Deconvolution of Astronomical Images in the Presence of Poisson Noise
van Dyk, David A.; Kashyap, Vinay L.; Siemiginowska, Aneta +2 more
We present a new framework for joint likelihood deconvolution (Jolideco) of a set of astronomical observations of the same sky region in the presence of Poisson noise. The observations may be obtained from different instruments with different resolution, and different point-spread functions (PSFs). Jolideco reconstructs a single flux image by opti…
Search for Young Stellar Objects within 4XMM-DR13 Using CatBoost and SPE
Zhang, Jingyi; Zhang, Yanxia; Kang, Zihan +3 more
Classifying and summarizing large data sets from different sky survey projects is essential for various subsequent scientific research. By combining data from 4XMM-DR13, Sloan Digital Sky Survey (SDSS) DR18, and CatWISE, we formed an XMM-WISE-SDSS sample that included information in the X-ray, optical, and infrared bands. By cross matching this sa…