Search Publications
Discovery of the Remarkably Red L/T Transition Object VHS J183135.58-551355.9
Meisner, Aaron M.; Kirkpatrick, J. Davy; Burgasser, Adam J. +13 more
We present the discovery of VHS J183135.58‑551355.9 (hereafter VHS J1831‑5513), an L/T transition dwarf identified as a result of its unusually red near-infrared colors (J ‑ K S = 3.633 ± 0.277 mag; J ‑ W2 = 6.249 ± 0.245 mag) from the VISTA Hemisphere Survey and CatWISE2020 surveys. We obtain low-resolution near-infrared spectroscopy o…
Spectroastrometric Survey of Protoplanetary Disks with Inner Dust Cavities
Banzatti, Andrea; Najita, Joan R.; Brittain, Sean D. +6 more
We present high-resolution spectra and spectroastrometric (SA) measurements of fundamental rovibrational CO emission from nine nearby (≲300 pc) protoplanetary disks where large inner dust cavities have been observed. The emission-line profiles and SA signals are fit with a slab disk model that allows the eccentricity of the disk and intensity of t…
HybPSF: Hybrid Point-spread Function Reconstruction for the Observed JWST NIRCam Image
Cheng, Cheng; Cui, Qifan; Nie, Lin +7 more
The James Webb Space Telescope (JWST) marks a new era of astronomical observation and discovery, providing unrivaled precision in various measurements, including photometry, morphology, and shear measurement. Accurate point-spread function (PSF) models are essential for many of these measurements. In this paper, we introduce HybPSF, a hybrid PSF c…
WIYN Open Cluster Study. XC. Radial-velocity Measurements and Spectroscopic Binary Orbits in the Open Cluster NGC 2506
Latham, David W.; Linck, Evan; Mathieu, Robert D.
NGC 2506 is a rich, intermediate-age (2.0 Gyr), metal-poor ([Fe/H] ∼ ‑0.2) open cluster. This work presents the results of 12,157 spectroscopic radial-velocity measurements of 2442 stars in the NGC 2506 field obtained over 41 yr, made as part of the WIYN Open Cluster Study. Radial-velocity measurements are complete for the population of proper-mot…
Planet Hunters TESS. V. A Planetary System Around a Binary Star, Including a Mini-Neptune in the Habitable Zone
Hogg, David W.; Aigrain, Suzanne; Bedell, Megan +61 more
We report on the discovery and validation of a transiting long-period mini-Neptune orbiting a bright (V = 9.0 mag) G dwarf (TOI 4633; R = 1.05 R ⊙, M = 1.10 M ⊙). The planet was identified in data from the Transiting Exoplanet Survey Satellite by citizen scientists taking part in the Planet Hunters TESS project. Modelling of …
Binary Fraction in Galactic Star Clusters: FSR 866, NGC 1960, and STOCK 2
Carraro, G.; Yalyalieva, L.; Glushkova, E. +1 more
The study of binary stars in different astronomical environments offers insights into the dynamical state of the hosting stellar systems. The binary fraction in fact plays a crucial role in the dynamical evolution of stellar systems, regulating processes like mass segregation and dynamical heating, and in some cases leading to the formation of exo…
A Volume-limited Radio Search for Magnetic Activity in 140 Exoplanets with the Very Large Array
Berger, Edo; Ortiz Ceballos, Kevin N.; Cendes, Yvette +1 more
We present results from a search for radio emission in 77 stellar systems hosting 140 exoplanets, predominantly within 17.5 pc using the Very Large Array (VLA) at 4–8 GHz. This is the largest and most sensitive search to date for radio emission in exoplanetary systems in the GHz frequency range. We obtained new observations of 58 systems and analy…
The Galactic Bulge Exploration. III. Calcium Triplet Metallicities for RR Lyrae Stars
Kunder, Andrea; Reggiani, Henrique; Covey, Kevin R. +5 more
RR Lyrae stars (RRLs) are excellent tracers of stellar populations for old, metal-poor components in the the Milky Way and the Local Group. Their luminosities have a metallicity dependence, but determining spectroscopic [Fe/H] metallicities for RRLs, especially at distances outside the solar neighborhood, is challenging. Using 40 RRLs with metalli…
Investigating the Star-forming Sites in the Outer Galactic Arm
Sharma, Saurabh; Verma, Aayushi; Kaur, Harmeen +7 more
We aim to investigate the global star formation scenario in star-forming sites AFGL 5157, [FSR2007] 0807 (hereafter FSR0807), [HKS2019] E70 (hereafter E70), [KPS2012] MWSC 0620 (hereafter KPS0620), and IRAS 05331+3115 in the outer Galactic arm. The distribution of young stellar objects in these sites coincides with a higher extinction and H2<…
Counting the Unseen. I. Nuclear Density Scaling Relations for Nucleated Galaxies
Stone, Nicholas C.; Seth, Anil C.; van Velzen, Sjoert +1 more
The volumetric rate of tidal disruption events (TDEs) encodes information on the still-unknown demographics of central massive black holes (MBHs) in low-mass galaxies (≲109 M ⊙). Theoretical TDE rates from model galaxy samples can extract this information, but this requires accurately defining the nuclear stellar density stru…