Search Publications
Fast and Wide CMEs without Observed >20 MeV Protons
Thompson, B. J.; Lario, D.; Krupar, V. +6 more
Statistical studies have found a close association between large solar energetic particle (SEP) events and fast and wide coronal mass ejections (CMEs). However, not all fast and wide CMEs have an associated SEP event. From the Coordinated Data Analysis Web catalog of CMEs observed by the Solar and Heliospheric Observatory (SOHO) between 2009 Janua…
Secular Extragalactic Parallax: Measurement Methods and Predictions for Gaia
Darling, Jeremy; Paine, Jennie; Graziani, Romain +1 more
Secular extragalactic parallax caused by the solar system's velocity relative to the cosmic microwave background rest frame may be observable as a dipole proper motion field with amplitude 78 µas yr-1 Mpc. Nearby galaxies also exhibit proper motions caused by their transverse peculiar velocities that prevent detection of secular p…
Study of the Decay Rates of the Umbral Area of Sunspot Groups Using a High-resolution Database
Muraközy, Judit
The emergence and decay of the sunspot groups are important components of the solar dynamo models. There are two different types of studies on the evolution of active regions. One of them is based on fewer data with higher spatial resolution, the other one uses more data with lower spatial resolution. The input data of the present study allow the …
The Space Environment and Atmospheric Joule Heating of the Habitable Zone Exoplanet TOI 700 d
Drake, Jeremy J.; Garraffo, C.; Alvarado-Gómez, J. D. +4 more
We investigate the space environment conditions near the Earth-size planet TOI 700 d using a set of numerical models for the stellar corona and wind, the planetary magnetosphere, and the planetary ionosphere. We drive our simulations using a scaled-down stellar input and a scaled-up solar input in order to obtain two independent solutions. We find…
Infrared Properties of Asymptotic Giant Branch Stars in Our Galaxy and the Magellanic Clouds
Suh, Kyung-Won
We investigate the infrared properties of asymptotic giant branch (AGB) stars in our Galaxy and the Magellanic Clouds using various infrared observational data and theoretical models. We use catalogs for the sample of 4996 AGB stars in our Galaxy and about 39,000 AGB stars in the Magellanic Clouds from the available literature. For each object in …
Cosmological 3D H I Gas Map with HETDEX Lyα Emitters and eBOSS QSOs at z = 2: IGM-Galaxy/QSO Connection and a ∼40 Mpc Scale Giant H II Bubble Candidate
Ono, Yoshiaki; Ouchi, Masami; Finkelstein, Steven L. +20 more
We present cosmological (30-400 Mpc) distributions of neutral hydrogen (H I) in the intergalactic medium (IGM) traced by Lyα emitters (LAEs) and QSOs at z = 2.1-2.5, selected with the data of the ongoing Hobby-Eberly Telescope Dark Energy Experiment (HETDEX) and the eBOSS survey. Motivated by a previous study of Mukae et al., we investigate spatia…
Soft X-Ray Observations of Quiescent Solar Active Regions Using the Novel Dual-zone Aperture X-Ray Solar Spectrometer
Woods, Thomas N.; Caspi, Amir; Mason, James Paul +3 more
The Dual-zone Aperture X-ray Solar Spectrometer (DAXSS) was flown on 2018 June 18 on the NASA 36.336 sounding rocket flight and obtained the highest resolution to date for solar soft X-ray (SXR) spectra over a broad energy range. This observation was during a time with quiescent (nonflaring) small active regions on the solar disk and when the 10.7…
Intermediate-mass Stars Become Magnetic White Dwarfs
Caiazzo, Ilaria; Heyl, Jeremy; Richer, Harvey +8 more
When a star exhausts its nuclear fuel, it either explodes as a supernova or more quiescently becomes a white dwarf, an object about half the mass of our Sun with a radius of about that of the Earth. About one-fifth of white dwarfs exhibit the presence of magnetic fields, whose origin has long been debated as either the product of previous stages o…
CO, Water, and Tentative Methanol in η Carinae Approaching Periastron
Corcoran, Michael; Gull, Theodore R.; Damineli, Augusto +12 more
The complex circumstellar environment around the massive binary and luminous blue variable η Carinae is known to harbor numerous light molecules, emitting most strongly in rotational states with upper level energies to ∼300 K. In circumstellar gas, the complex organic molecule methanol (CH3OH) has been found almost exclusively around yo…
The Hyperluminous, Dust-obscured Quasar W2246-0526 at z = 4.6: Detection of Parsec-scale Radio Activity
Knudsen, Kirsten K.; Yang, Jun; An, Tao +4 more
WISE J224607.56-052634.9 (W2246-0526) is a hyperluminous (Lbol ≈ 1.7 × 1014 L⊙), dust-obscured, and radio-quiet quasar at redshift z = 4.6. It plays a key role in probing the transition stage between dusty starbursts and unobscured quasars in the coevolution of galaxies and supermassive black holes (SMBHs). To sear…