Search Publications
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…
Solar Electron Beam-Langmuir Wave Interactions and How They Modify Solar Electron Beam Spectra: Solar Orbiter Observations of a Match Made in the Heliosphere
Verscharen, Daniel; Maksimovic, Milan; Ryan, Daniel F. +7 more
Solar Orbiter's four in situ instruments have recorded numerous energetic electron events at heliocentric distances between 0.5 and 1 au. We analyze energetic electron fluxes, spectra, pitch-angle distributions, associated Langmuir waves, and type III solar radio bursts for three events to understand what causes modifications in the electron flux …
Are "Changing-look" Active Galactic Nuclei Special in the Coevolution of Supermassive Black Holes and Their Hosts? I.
Filippenko, A. V.; Wang, J.; Gao, C. +5 more
The nature of the so-called "changing-look" (CL) active galactic nucleus (AGN), which is characterized by spectral-type transitions within ~10 yr, remains an open question. As the first in our series of studies, we attempt here to understand the CL phenomenon from the view of the coevolution of AGNs and their host galaxies (i.e., if CL-AGNs are at…
The Isotropic Center of NGC 5419-A Core in Formation?
Bender, Ralf; Thomas, Jens; Naab, Thorsten +5 more
With its cored surface brightness profile, the elliptical galaxy NGC 5419 appears as a typical high-mass early-type galaxy (ETG). However, the galaxy hosts two distinct nuclei in its center. We use high-signal MUSE (Multi-unit Spectroscopic Explorer (Based on observations collected at the European Organisation for Astronomical Research in the Sout…
Time Dependence of 50-250 MeV Galactic Cosmic-Ray Protons between Solar Cycles 24 and 25, Measured by the High-energy Particle Detector on board the CSES-01 Satellite
Vitale, V.; Ubertini, P.; Potgieter, M. S. +54 more
Time-dependent energy spectra of galactic cosmic rays (GCRs) carry crucial information regarding their origin and propagation throughout the interstellar environment. When observed at the Earth, after traversing the interplanetary medium, such spectra are heavily affected by the solar wind and the embedded solar magnetic field permeating the inner…
NEID Reveals That the Young Warm Neptune TOI-2076 b Has a Low Obliquity
Mahadevan, Suvrath; Wisniewski, John; Wright, Jason T. +27 more
TOI-2076 b is a sub-Neptune-sized planet (R = 2.39 ± 0.10 R ⊕) that transits a young (204 ± 50 MYr) bright (V = 9.2) K-dwarf hosting a system of three transiting planets. Using spectroscopic observations obtained with the NEID spectrograph on the WIYN 3.5 m Telescope, we model the Rossiter-McLaughlin effect of TOI-2076 b, and derive a s…
Resolved Velocity Profiles of Galactic Winds at Cosmic Noon
Kacprzak, Glenn G.; Glazebrook, Karl; Tran, Kim-Vy H. +7 more
We study the kinematics of the interstellar medium (ISM) viewed "down the barrel" in 20 gravitationally lensed galaxies during cosmic noon (z = 1.5-3.5). We use moderate-resolution spectra (R ~ 4000) from Keck's Echellette Spectrograph and Imager and Magellan/MagE to spectrally resolve the ISM absorption in these galaxies into ~10 independent elem…
Identification of a Helium Donor Star in NGC 247 ULX-1
Feng, Hua; Bian, Fuyan; Zhou, Changxing
With Very Large Telescope Multi Unit Spectroscopic Explorer (MUSE) observations, we detected highly variable helium emission lines from the optical counterpart of the supersoft ultraluminous X-ray source (ULX) NGC 247 ULX-1. No Balmer lines can be seen in the source spectrum. This is the first evidence for the presence of a helium donor star in UL…