Search Publications
Mapping the Milky Way in 5D with 170 Million Stars
Conroy, Charlie; Ting, Yuan-Sen; Cargile, Phillip A. +18 more
We present Augustus, a catalog of distance, extinction, and stellar parameter estimates for 170 million stars from 14 mag < r < 20 mag and with ∣b∣ > 10° drawing on a combination of optical to near-infrared photometry from Pan-STARRS, 2MASS, UKIDSS, and unWISE along with parallax measurements from Gaia DR2 and 3D dust extinction maps. Aft…
BP3M: Bayesian Positions, Parallaxes, and Proper Motions Derived from the Hubble Space Telescope and Gaia Data
van der Marel, Roeland P.; Watkins, Laura L.; Libralato, Mattia +9 more
We present a hierarchical Bayesian pipeline, BP3M, that measures positions, parallaxes, and proper motions (PMs) for cross-matched sources between Hubble Space Telescope (HST) images and Gaia—even for sparse fields (N * < 10 per image)—expanding from the recent GaiaHub tool. This technique uses Gaia-measured astrometry as priors to p…
An Elemental Abundance Diagnostic for Coordinated Solar Orbiter/SPICE and Hinode/EIS Observations
Matthews, Sarah A.; Warren, Harry P.; Brooks, David H. +2 more
Plasma composition measurements are a vital tool for the success of current and future solar missions, but density- and temperature-insensitive spectroscopic diagnostic ratios are sparse, and their underlying accuracy in determining the magnitude of the first ionization potential (FIP) effect in the solar atmosphere remains an open question. Here …
A 9 Month Hubble Space Telescope Near-UV Survey of M87. II. A Strongly Enhanced Nova Rate near the Jet of M87
Shara, Michael M.; Sparks, William; Lessing, Alec M. +3 more
The 135 classical novae that we have discovered in M87 with two Hubble Space Telescope imaging surveys appear to be strongly concentrated along that galaxy's jet. Detailed simulations show that the likelihood that this distribution occurred by chance is of order 0.3%. The novae near the jet display outburst characteristics (peak luminosities, colo…
Solar Eruptive Phenomena Associated with Solar Energetic Electron Spectral Types
Krucker, Säm; Wimmer-Schweingruber, Robert F.; Wang, Linghua +3 more
The energy spectral shape of solar energetic electron events carries important information on the energetic electron source/acceleration at the Sun. We investigate the association of six newly identified solar energetic electron spectral types with solar eruptive phenomena, including the downward double-power-law (DDPL) spectrum with break energy …
Host Galaxy and Nuclear Properties of IR-selected AGNs with and without Outflow Signatures
Li, Zi-Jian; Dai, Y. Sophia; Oio, Gabriel A. +1 more
Active galactic nucleus (AGN) driven outflows can have a significant impact on the evolution of the host galaxy. In this work, we compare the properties of galaxies that host AGNs with and without outflows. Our sample consists of 103 AGNs identified by mid-IR color–color selection and confirmed with optical spectroscopy at a redshift range of 0.3 …
First Direct Imaging of a Kelvin–Helmholtz Instability by PSP/WISPR
Vourlidas, Angelos; Stenborg, Guillermo; Howard, Russell A. +3 more
We present a comprehensive analysis aimed at proving the hypothesis that a train of small-scale features observed by the Wide-field Imager (WISPR) onboard the Parker Solar Probe (PSP) are the signature of a Kelvin–Helmholtz instability (KHI). These features were seen near the flank of a Coronal Mass Ejection (CME) wake between 7.5 R ⊙ a…
A Data-driven Spectral Model of Main-sequence Stars in Gaia DR3
Bedell, Megan; Angelo, Isabel; Ness, Melissa +1 more
Precise spectroscopic classification of planet hosts is an important tool of exoplanet research at both the population and individual system level. In the era of large-scale surveys, data-driven methods offer an efficient approach to spectroscopic classification that leverages the fact that a subset of stars in any given survey has stellar propert…
Obliquity Constraints for the Extremely Eccentric Sub-Saturn Kepler-1656 b
Huber, Daniel; Howard, Andrew W.; Petigura, Erik A. +25 more
The orbits of close-in exoplanets provide clues to their formation and evolutionary history. Many close-in exoplanets likely formed far out in their protoplanetary disks and migrated to their current orbits, perhaps via high-eccentricity migration (HEM), a process that can also excite obliquities. A handful of known exoplanets are perhaps caught i…
Probing the Stellar Populations and Star Formation History of Early-type Galaxies at 0 < z < 1.1 in the Rest-frame Ultraviolet
Desprez, Guillaume; Sawicki, Marcin; Gwyn, Stephen +6 more
We measure the evolution of the rest-frame near-ultraviolet (NUV)‑V colors for early-type galaxies in clusters at 0 < z < 1.1 using data from the Hyper Suprime-Cam Subaru Strategic Program, CFHT Large Area U-band Deep Survey, and local Sloan Digital Sky Survey clusters observed with Galaxy Evolution Explorer. Our results show that there is a…