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KPF Confirms a Polar Orbit for KELT-18 b
Howard, Andrew W.; Petigura, Erik A.; Behmard, Aida +24 more
We present the first spectroscopic transit results from the newly commissioned Keck Planet Finder on the Keck-I telescope at W. M. Keck Observatory. We observed a transit of KELT-18 b, an inflated ultrahot Jupiter orbiting a hot star (T eff = 6670 K) with a binary stellar companion. By modeling the perturbation to the measured cross-cor…
Two Young Eclipsing Binaries in Orion with Temperatures and Radii Affected by Spots and Third Bodies
Stassun, Keivan G.; Kounkel, Marina
In this work we present a model of two young eclipsing binaries in the Orion complex. Both heavily spotted, they present radii and temperatures that are in disagreement with the predictions of standard stellar models. 2M05‑06 consists of two stars with different masses (∼0.52 and ∼0.42 M ⊙) but with very similar radii (∼0.9 R ⊙
The TESS–Keck Survey. XIX. A Warm Transiting Sub-Saturn-mass Planet and a Nontransiting Saturn-mass Planet Orbiting a Solar Analog
Batalha, Natalie M.; Bieryla, Allyson; Latham, David W. +45 more
The Transiting Exoplanet Survey Satellite (TESS) continues to increase dramatically the number of known transiting exoplanets, and is optimal for monitoring bright stars amenable to radial velocity (RV) and atmospheric follow-up observations. TOI-1386 is a solar-type (G5V) star that was detected via TESS photometry to exhibit transit signatures in…
NGC 1856: Using Machine Learning Techniques to Uncover Detailed Stellar Abundances from MUSE Data
Hernandez, S.; Wang, Z.; Matteucci, F. +5 more
We present the first application of the novel approach based on data-driven machine learning methods applied to Multi-Unit Spectroscopic Explorer (MUSE) field data to derive stellar abundances of star clusters. MUSE has been used to target more than 10,000 fields, and it is unique in its ability to study dense stellar fields such as stellar cluste…
Identification and Distance Measurement of Dust Clouds at High Latitude by a Clustering Hierarchical Algorithm
Jiang, Biwei; Cui, Wenyuan; Sun, Mingxu +1 more
We present a catalog of dust clouds at high Galactic latitude based on the Planck 857 GHz dust emission data. Using a clustering hierarchical algorithm, 315 dust clouds at high Galactic latitudes are identified. Additionally, using the optical and ultraviolet extinction of 4 million and 1 million stars, respectively, provided by Sun et al., we der…
The Destiny of the Open Cluster NGC 6530: Past and Future
Li, Lu; Shao, Zhengyi; Jia, Delong +1 more
Studying the structures of open clusters is crucial for understanding stellar evolution and galactic dynamics. Based on Gaia DR3 data, we apply the hierarchical clustering algorithm to the young open cluster NGC 6530 and group its members into five substructures. By linear tracing with the kinematic information of their members, we find that sub 1…
Haro 5-2: A New Pre-main-sequence Quadruple Stellar System
Flores, C.; Geballe, T. R.; Reipurth, Bo +9 more
We have discovered that the Hα emission-line star Haro 5-2, located in the 3–6 Myr old Ori OB1b association, is a young quadruple system. The system has a 2+2 configuration, with an outer separation of 2.″6 and with resolved subarcsecond inner binary components. The brightest component, Aa, dominates the A-binary; it is a weak-line T Tauri star wi…
Pixel-level Terrain Processing of the Martian Surface from Moderate Resolution Images of Tianwen-1
Liu, Dingxin; Yan, Wei; Liu, Jianjun +3 more
The moderate-resolution camera (MoRIC) of the Tianwen-1 orbiter, China's first Mars exploration mission, is a frame-imaging scheme color camera. However, generating a precise digital elevation model (DEM) from these images faces challenges due to the presence of featureless and repetitive regions on the Martian surface. Traditional photogrammetric…
SuperBIT Superpressure Flight Instrument Overview and Performance: Near-diffraction-limited Astronomical Imaging from the Stratosphere
Massey, Richard; Jauzac, Mathilde; Harvey, David +26 more
SuperBIT was a 0.5 m near-UV to near-infrared wide-field telescope that launched on a NASA superpressure balloon into the stratosphere from New Zealand for a 45-night flight. SuperBIT acquired multiband images of galaxy clusters to study the properties of dark matter using weak gravitational lensing. We provide an overview of the instrument and it…
Gemini Planet Imager Observations of a Resolved Low-inclination Debris Disk around HD 156623
Crotts, Katie A.; Matthews, Brenda C.; Duchêne, Gaspard +12 more
The 16 Myr old A0V star HD 156623 in the Scorpius–Centaurus association hosts a high-fractional-luminosity debris disk, recently resolved in scattered light for the first time by the Gemini Planet Imager (GPI) in polarized intensity only. We present a new analysis of the GPI H-band polarimetric detection of the HD 156623 debris disk, with particul…