Search Publications
Icarus: A Flat and Fast Prograde Stellar Stream in the Milky Way Disk
Cignoni, Michele; Lattanzi, Mario G.; Re Fiorentin, Paola +1 more
We explore the local volume of the Milky Way via chemical and kinematical measurements from high-quality astrometric and spectroscopic data recently released by the Gaia, APOGEE, and GALAH programs. We chemically select 1137 stars up to 2.5 kpc of the Sun and [Fe/H] ≤ -1.0 dex, and find evidence of statistically significant substructures. Clusteri…
Measurements of Coronal Magnetic Field Strengths in Solar Active Region Loops
Landi, Enrico; Warren, Harry P.; Brooks, David H.
The characteristic electron densities, temperatures, and thermal distributions of 1 MK active region loops are now fairly well established, but their coronal magnetic field strengths remain undetermined. Here we present measurements from a sample of coronal loops observed by the Extreme-ultraviolet Imaging Spectrometer on Hinode. We use a recently…
The Influence of Age on the Relative Frequency of Super-Earths and Sub-Neptunes
David, Trevor J.; Contardo, Gabriella; Sandoval, Angeli
There is growing evidence that the population of close-in planets discovered by the Kepler mission was sculpted by atmospheric loss, though the typical timescale for this evolution is not well-constrained. Among a highly complete sample of planet hosts of varying ages the age-dependence of the relative fraction of super-Earth and sub-Neptune detec…
TIC 454140642: A Compact, Coplanar, Quadruple-lined Quadruple Star System Consisting of Two Eclipsing Binaries
Kostov, Veselin B.; Powell, Brian P.; Rappaport, Saul A. +30 more
We report the discovery of a compact, coplanar, quadruple-lined, eclipsing quadruple star system from Transiting Exoplanet Survey Satellite data, TIC 454140642, also known as TYC 0074-01254-1. The target was first detected in Sector 5 with a 30-minute cadence in full-frame images and then observed in Sector 32 with a 2-minute cadence. The light cu…
Mapping the Galactic Disk with the LAMOST and Gaia Red Clump Sample. VII. The Stellar Disk Structure Revealed by the Mono-abundance Populations
Shi, Jianrong; Xiang, Maosheng; Huang, Yang +7 more
Using a sample of 96,201 primary red clump stars selected from the LAMOST and Gaia surveys, we investigate the stellar structure of the Galactic disk. The sample stars show two separated sequences of high-[α/Fe] and low-[α/Fe] in the [α/Fe]-[Fe/H] plane. We divide the sample stars into five mono-abundance populations (MAPs) with different ranges o…
First HETDEX Spectroscopic Determinations of Lyα and UV Luminosity Functions at z = 2-3: Bridging a Gap between Faint AGNs and Bright Galaxies
Ono, Yoshiaki; Ouchi, Masami; Finkelstein, Steven L. +21 more
We present Lyα and ultraviolet (UV)-continuum luminosity functions (LFs) of galaxies and active galactic nuclei (AGNs) at z = 2.0-3.5 determined by the untargeted optical spectroscopic survey of the Hobby-Eberly Telescope Dark Energy Experiment (HETDEX). We combine deep Subaru imaging with HETDEX spectra resulting in 11.4 deg2 of fiber …
Toward Precision Cosmology with Improved PNLF Distances Using VLT-MUSEI. Methodology and Tests
Weilbacher, Peter M.; Roth, Martin M.; Ciardullo, Robin +3 more
The [O III] λ5007 planetary nebula luminosity function (PNLF) is an established distance indicator that has been used for more than 30 yr to measure the distances of galaxies out to ~15 Mpc. With the advent of the Multi-Unit Spectroscopic Explorer on the Very Large Telescope (MUSE) as an efficient wide-field integral-field spectrograph, the PNLF m…
Three K2 Campaigns Yield Rotation Periods for 1013 Stars in Praesepe
Cargile, Phillip A.; Rampalli, Rayna; Law, Nicholas M. +8 more
We use three campaigns of K2 observations to complete the census of rotation in low-mass members of the benchmark, ≈670 Myr old open cluster Praesepe. We measure new rotation periods (P rot) for 220 ≲1.3 M ⊙ Praesepe members and recovery periods for 97% (793/812) of the stars with a P rot in the literature. Of the …
Formation of Phosphorus Monoxide (PO) in the Interstellar Medium: Insights from Quantum-chemical and Kinetic Calculations
Jiménez-Serra, Izaskun; Roncero, Octavio; García de la Concepción, Juan +2 more
In recent years, phosphorus monoxide (PO), an important molecule for prebiotic chemistry, has been detected in star-forming regions and in the comet 67P/Churyumov-Gerasimenko. These studies have revealed that, in the interstellar medium (ISM), PO is systematically the most abundant P-bearing species, with abundances that are about one to three tim…
The Sloan Digital Sky Survey Reverberation Mapping Project: The MBH-Host Relations at 0.2 ≲ z ≲ 0.6 from Reverberation Mapping and Hubble Space Telescope Imaging
Trump, Jonathan R.; Brandt, W. N.; Shen, Yue +10 more
We present the results of a pilot Hubble Space Telescope (HST) imaging study of the host galaxies of ten quasars from the Sloan Digital Sky Survey Reverberation Mapping (SDSS-RM) project. Probing more than an order of magnitude in black hole (BH) and stellar masses, our sample is the first statistical sample to study the BH-host correlations beyon…