Search Publications
Radio Emission from High-redshift Active Galactic Nuclei in the JADES and CEERS Surveys
Whalen, Daniel J.; Latif, Muhammad A.; Aftab, Ammara
Recent calculations indicate that radio emission from quasars at z ∼ 6–7 could be detected at much earlier stages of evolution, at z ∼ 14–15, by the Next-Generation Very Large Array (ngVLA) and the Square Kilometer Array (SKA). However, the James Webb Space Telescope has now discovered less luminous active galactic nuclei (AGNs) at z > 4 and a …
Searching for GEMS: TOI-6383Ab, a Giant Planet Transiting an M3-dwarf Star in a Binary System
Kobulnicky, Henry A.; Cochran, William D.; Mahadevan, Suvrath +22 more
We report on the discovery of a transiting giant planet around the 3500 K M3-dwarf star TOI-6383A located 172 pc from Earth. It was detected by the Transiting Exoplanet Survey Satellite and confirmed by a combination of ground-based follow-up photometry and precise radial velocity measurements. This planet has an orbital period of ∼1.791 days, a m…
HIP 65426 is a High-frequency Delta Scuti Pulsator in Plausible Spin–Orbit Alignment with its Directly Imaged Exoplanet
Huber, Daniel; Bedding, Timothy R.; Murphy, Simon J. +4 more
HIP 65426 hosts a young giant planet that has become the first exoplanet directly imaged with JWST. Using time-series photometry from the Transiting Exoplanet Survey Satellite (TESS), we classify HIP 65426 as a high-frequency δ Scuti pulsator with a possible large-frequency separation of Δν = 7.23 ± 0.02 cycles day‑1. We check the TESS …
JWST/NIRCam Imaging of Young Stellar Objects. III. Detailed Imaging of the Nebular Environment around the HL Tau Disk
Dong, Ruobing; Wolff, Schuyler G.; Johnstone, Doug +13 more
As part of the James Webb Space Telescope (JWST) Guaranteed Time Observation program "Direct Imaging of YSOs" (program ID 1179), we use JWST NIRCam's direct imaging mode in F187N, F200W, F405N, and F410M to perform high-contrast observations of the circumstellar structures surrounding the protostar HL Tau. The data reveal the known stellar envelop…
DIAmante TESS AutoRegressive Planet Search (DTARPS). III. Understanding the DTARPS-S Candidate Transiting Planet Catalogs
Feigelson, Eric D.; Montalto, Marco; Melton, Elizabeth J. +3 more
The DIAmante Transiting Exoplanet Sky Survey (TESS) AutoRegressive Planet Search (DTARPS) project, using novel statistical methods, has identified several hundred candidates for transiting planetary systems obtained from 0.9 million full-frame Image light curves obtained in the TESS Year 1 southern-hemisphere survey. Ten lines of evidence includin…
Low-mass Stellar and Substellar Content of the Young Cluster Berkeley 59
Samal, Manash R.; Sharma, Saurabh; Panwar, Neelam +4 more
We present a multiwavelength analysis of the young star cluster Berkeley 59, based on Gaia data and deep IR observations with the 3.58 m Telescopio Nazionale Galileo and Spitzer space telescope. The mean proper motion of the cluster is found to be µ α cosδ ∼ ‑0.63 mas yr‑1 and µ δ ∼ ‑1.83 mas yr…
The Solar Neighborhood LI: A Variability Survey of Nearby M Dwarfs with Planets from Months to Decades with TESS and the CTIO/SMARTS 0.9 m Telescope
Henry, Todd J.; Jao, Wei-Chun; Vrijmoet, Eliot Halley +2 more
We present the optical photometric variability of 32 planet-hosting M dwarfs within 25 pc over timescales of months to decades. The primary goal of this project—A Trail to Life Around Stars (ATLAS)—is to follow the trail to life by revealing nearby M dwarfs with planets that are also "quiet," which may make them more amiable to habitability. There…
Cloud–Cloud Collision and Cluster Formation in the W5-NW Complex
Tej, Anandmayee; Liu, Hong-Li; Liu, Tie +5 more
We present a detailed structural and gas kinematic study of the star-forming complex W5-NW. A cloud–cloud collision scenario unravels with evidence of collision-induced star and cluster formation. Various signatures of cloud–cloud collision such as "complementary distribution" and "bridging features" are explored. At the colliding region, the two …
Post-new-horizons Orbits and Masses for the Satellites of Pluto
Jacobson, Robert A.; Brozović, Marina
We report on ephemerides for the satellites of Pluto based on the large set of astrometric measurements. Our orbit fit yielded the following masses with 1σ uncertainties: GM Pluto = 869.3 ± 0.4 km3 s‑2, GM Charon = 106.1 ± 0.3 km3 s‑2, GM Nix = 1.50 ± 0.52 × 10‑3
Revising Properties of Planet–Host Binary Systems. IV. The Radius Distribution of Small Planets in Binary Star Systems Is Dependent on Stellar Separation
Huber, Daniel; Berger, Travis A.; Gaidos, Eric +10 more
Small planets (R p ≤ 4 R ⊕) are divided into rocky super-Earths and gaseous sub-Neptunes separated by a radius gap, but the mechanisms that produce these distinct planet populations remain unclear. Binary stars are the only main-sequence systems with an observable record of the protoplanetary disk lifetime and mass reservoi…