Search Publications
A Study of Sunspot 3 Minute Oscillations Using ALMA and GST
Yurchyshyn, Vasyl; Gary, Dale E.; Reardon, Kevin P. +1 more
Waves and oscillations are important solar phenomena, not only because they can propagate and dissipate energy in the chromosphere, but also because they carry information about the structure of the atmosphere in which they propagate. The nature of the 3 minute oscillations observed in the umbral region of sunspots is considered to be an effect of…
Combined spectroscopy and intensity interferometry to determine the distances of the blue supergiants P Cygni and Rigel
Domiciano de Souza, A.; Vakili, F.; Rivet, J. -P. +10 more
In this paper, we report on spatial intensity interferometry measurements within the Hα line on two stars: the Luminous Blue Variable supergiant P Cygni and the late-type B supergiant Rigel. The experimental setup was upgraded to allow simultaneous measurement of two polarization channels, instead of one in our previous setup, and the zero baselin…
The outermost stellar halo of NGC 5128 (Centaurus A): Radial structure
Rejkuba, M.; Greggio, L.; Crnojević, D. +2 more
Context. The extended stellar halos of galaxies contain important clues for investigating their assembly history and evolution.
Aims: We investigate the resolved stellar content and the extended halo of NGC 5128 as a function of galactocentric distance, and trace the halo outward to its currently detectable limits.
Methods: We used Hubbl…
Two New Black Widow Millisecond Pulsars in M28
Cadelano, Mario; Pallanca, Cristina; Ransom, Scott M. +18 more
We report the discovery of two Black Widow millisecond pulsars in the globular cluster (GC) M28 with the MeerKAT telescope. PSR J1824-2452M (M28M) is a 4.78 ms pulsar in a 5.82 hr orbit, and PSR J1824-2452N (M28N) is a 3.35 ms pulsar in a 4.76 hr orbit. Both pulsars have dispersion measures near 119.30 pc cm-3 and have low-mass companio…
Near-ultraviolet to visible spectroscopy of the Themis and Polana-Eulalia complex families
Tatsumi, E.; Licandro, J.; Popescu, M. +2 more
Context. Spectrophotometry data of asteroids obtained in the 1980s showed that there are large variations in their near-ultraviolet (NUV) reflectance spectra. Reflectance spectra at NUV wavelengths are important because they help detect the presence of hydrated minerals and organics on the asteroid surfaces. However, the NUV wavelength region has …
The "Maggie" filament: Physical properties of a giant atomic cloud
Schneider, N.; Klessen, R. S.; Beuther, H. +19 more
Context. The atomic phase of the interstellar medium plays a key role in the formation process of molecular clouds. Due to the line-of-sight confusion in the Galactic plane that is associated with its ubiquity, atomic hydrogen emission has been challenging to study.
Aims: We investigate the physical properties of the "Maggie" filament, a larg…
TOI-2046b, TOI-1181b, and TOI-1516b, three new hot Jupiters from TESS: planets orbiting a young star, a subgiant, and a normal star
Latham, David W.; Cochran, William D.; Endl, Michael +54 more
We present the confirmation and characterization of three hot Jupiters, TOI-1181b, TOI-1516b, and TOI-2046b, discovered by the TESS space mission. The reported hot Jupiters have orbital periods between 1.4 and 2.05 d. The masses of the three planets are 1.18 ± 0.14 MJ, 3.16 ± 0.12 MJ, and 2.30 ± 0.28 MJ, for TOI-11…
GOALS-JWST: Unveiling Dusty Compact Sources in the Merging Galaxy IIZw096
Inami, Hanae; Böker, Torsten; Kemper, Francisca +30 more
We have used the Mid-InfraRed Instrument (MIRI) on the James Webb Space Telescope (JWST) to obtain the first spatially resolved, mid-infrared images of IIZw096, a merging luminous infrared galaxy (LIRG) at z = 0.036. Previous observations with the Spitzer Space Telescope suggested that the vast majority of the total IR luminosity (L IR)…
Stellar proper motions in the outskirts of classical dwarf spheroidal galaxies with Gaia EDR3
Pace, Andrew B.; Zivick, Paul; Riley, Alexander H. +2 more
We use Gaia EDR3 data to identify stars associated with six classical dwarf spheroidals (dSphs) (Draco, Ursa Minor, Sextans, Sculptor, Fornax, Carina) at their outermost radii, beyond their nominal King stellar limiting radius. For all of the dSphs examined, we find radial velocity matches with stars residing beyond the King limiting radius and wi…
Frontiers in accretion physics at high X-ray spectral resolution
Díaz Trigo, M.; Cappi, M.; Done, C. +14 more
Microcalorimeters have shown remarkable success in delivering high-spectral-resolution observations of the hot and energetic Universe, and have paved the way to revolutionary new science possibilities in X-ray astronomy. There are several research areas in compact-object science that can only be addressed with energy resolution ΔE ≲ 5 eV at photon…