Search Publications
A Census of Near-UV M-dwarf Flares Using Archival GALEX Data and the gPHOTON2 Pipeline
Shvartzvald, Yossi; Perdelwitz, Volker; Ben-Ami, Sagi +1 more
M-dwarfs are common stellar hosts of habitable-zone exoplanets. Near-UV (NUV) radiation can severely impact the atmospheric and surface conditions of such planets, making the characterization of NUV flaring activity a key aspect in determining habitability. We use archival data from the Galaxy Evolution Explorer (GALEX) and XMM-Newton telescopes t…
Hadronic Processes at Work in 5BZB J0630‑2406
Marchesi, Stefano; Fichet de Clairfontaine, Gaëtan; Buson, Sara +6 more
Recent observations are shedding light on the important role that active galactic nuclei play in the production of high-energy neutrinos. In this study, we focus on one object, 5BZB J0630‑2406, which is among the blazars recently proposed as associated with neutrino emission during the first 7 yr of IceCube observations. Modeling the quasi-simulta…
Massive Star Formation in the Tarantula Nebula
Hirschauer, Alec S.; Lebouteiller, Vianney; Lee, Min-Young +17 more
In this work, we present 299 candidate young stellar objects (YSOs) in 30 Doradus discovered using Spitzer and Herschel point-source catalogs, 276 of which are new. We study the parental giant molecular clouds in which these YSO candidates form using recently published Atacama Large Millimeter/submillimeter Array (ALMA) Cycle 7 observations of
Role of Small-scale Impulsive Events in Heating the X-Ray Bright Points of the Quiet Sun
Del Zanna, Giulio; Bhardwaj, Anil; Mason, Helen E. +6 more
Small-scale impulsive events, known as nanoflares, are thought to be one of the prime candidates that can keep the solar corona hot at its multimillion-Kelvin temperature. Individual nanoflares are difficult to detect with the current generation of instruments; however, their presence can be inferred through indirect techniques such as Differentia…
A Broadband X-Ray Study of the Rabbit Pulsar Wind Nebula Powered by PSR J1418-6058
Woo, Jooyun; An, Hongjun; Mori, Kaya +4 more
We report on broadband X-ray properties of the Rabbit pulsar wind nebula (PWN) associated with the pulsar PSR J1418-6058 using archival Chandra and XMM-Newton data, as well as a new NuSTAR observation. NuSTAR data above 10 keV allowed us to detect the 110 ms spin period of the pulsar, characterize its hard X-ray pulse profile, and resolve hard X-r…
SDSS J134441.83+204408.3: A Highly Asynchronous Short-period Magnetic Cataclysmic Variable with a 56 MG Field Strength
Garnavich, Peter; Littlefield, Colin; Szkody, Paula +6 more
When the accreting white dwarf in a magnetic cataclysmic variable star (mCV) has a field strength in excess of 10 MG, it is expected to synchronize its rotational frequency to the binary orbit frequency, particularly at small binary separations, due to the steep radial dependence of the magnetic field. We report the discovery of an mCV (SDSS J1344…
The Fate of the Interstellar Medium in Early-type Galaxies. II. Observational Evidence for Morphological Quenching
Michałowski, M. J.; Hjorth, J.; Gall, C. +4 more
The mechanism by which galaxies stop forming stars and get rid of their interstellar medium (ISM) remains elusive. Here, we study a sample of more than 2000 elliptical galaxies in which dust emission has been detected. This is the largest sample of such galaxies ever analyzed. We infer the timescale for removal of dust in these galaxies and invest…
TOI-1670 c, a 40 day Orbital Period Warm Jupiter in a Compact System, Is Well Aligned
Mahadevan, Suvrath; Rice, Malena; Wright, Jason T. +21 more
We report the measurement of the sky-projected obliquity angle λ of the warm Jovian exoplanet TOI-1670 c via the Rossiter-McLaughlin effect. We observed the transit window during UT 2023 April 20 for 7 continuous hours with NEID on the 3.5 m WIYN Telescope at Kitt Peak National Observatory. TOI-1670 hosts a sub-Neptune (P ~ 11 days; planet b) inte…
Far-ultraviolet Spectroscopy of Active Galactic Nuclei with ASTROSAT/UVIT
Papadakis, I. E.; Singh, K. P.; Dewangan, G. C. +4 more
We study accretion disk emission from eight Seyfert 1-1.5 active galactic nuclei (AGN) using far-ultraviolet (FUV) (1300-1800 Å) slitless grating spectra acquired with AstroSat/UVIT. We correct for the Galactic and intrinsic extinction, contamination from the host galaxies, narrow and broad-line regions, Fe II emission, and Balmer continuum, and d…
Unraveling the Complex Structure of AGN-driven Outflows. VI. Strong Ionized Outflows in Type 1 AGNs and the Outflow Size-Luminosity Relation
Luo, Rongxin; Chung, Aeree; Baek, Junhyun +4 more
We present spatially resolved gas kinematics, ionization, and energetics of 11 type 1 and 5 type 2 active galactic nuclei (AGNs) with strong ionized gas outflows at z <0.3 using Gemini Multi-Object Spectrograph Integral Field Unit data. We find a strongly blueshifted region in [O III] velocity maps, representing an approaching cone in biconical…