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The GALAH Survey: Stellar parameters and abundances for 800 000 Gaia RVS spectra using GALAH DR4 and The Cannon
Lewis, Geraint F.; Casey, Andrew R.; Buder, Sven +15 more
Analysing stellar parameters and abundances from nearly one million Gaia Data Release 3 (DR3) Radial Velocity Spectrometer (RVS) spectra poses challenges due to the limited spectral coverage (restricted to the infrared Ca II triplet) and variable signal-to-noise ratios of the data. To address this, we use The Cannon, a data-driven method, to trans…
Constraining the scattered light properties of LTT 9779 b using HST/WFC3 UVIS
Wakeford, Hannah R.; Cowan, Nicolas B.; Parmentier, Vivien +5 more
A planet's albedo is a fundamental property that sets its energy budget by dictating the fraction of incident radiation absorbed versus reflected back to space. Generally, optical eclipse observations have revealed the majority of hot, giant planets to have low albedos, indicating dayside atmospheres dominated by absorption instead of reflection. …
Astrometric Calibration of MagAO-X with Updated Solutions for HD 165054 Field Stars
Guyon, Olivier; Close, Laird M.; Males, Jared R. +13 more
MagAO-X is a recently commissioned extreme adaptive optics instrument for the Magellan Clay 6.5 m telescope at Las Campanas Observatory in Chile. MagAO-X had first light in 2019 and subsequent commissioning observations in 2022 and 2023. An essential step for the commissioning of any new instrument is the calibration of the conversion of detector …
Can the Central Compact Object in HESS J1731–347 Be Indeed the Lightest Neutron Star Observed?
Zhang, S. R.; Rueda Hernandez, J. A.; Negreiros, R.
The exceptionally low mass of
On the origin of the Hercules group - I. Chemical signatures indicating the outer bar origin
Jerjen, Helmut; Buder, Sven; Freeman, Kenneth +3 more
The Hercules kinematic group is a kinematic anomaly of stars observed in the solar neighbourhood (SNd). In this series of papers, we present a comprehensive study of this structure. This paper focuses on its chemical signatures over several groups of elements. The next paper discusses its kinematical properties. While studies suggested a non-nativ…
Preparing for the Early eVolution Explorer: Characterizing the Photochemical Inputs and Transit Detection Efficiencies of Young Planets Using Multiwavelength Flare Observations by TESS and Swift
MacGregor, Meredith A.; Cody, Ann Marie; Vega, Laura D. +6 more
Ultraviolet flare emission can drive photochemistry in exoplanet atmospheres and even serve as the primary source of uncertainty in atmospheric retrievals. Additionally, flare energy budgets are not well understood due to a paucity of simultaneous observations. We present new near-UV (NUV) and optical observations of flares from three M dwarfs obt…
The NCORES programme: precise planetary masses, null results, and insight into the planet mass distribution near the radius gap
Lester, Kathryn V.; Wheatley, Peter J.; Bayliss, Daniel +39 more
NCORES was a large observing programme on the ESO HARPS spectrograph, dedicated to measuring the masses of Neptune-like and smaller transiting planets discovered by the TESS satellite using the radial velocity technique. This paper presents an overview of the programme, its scientific goals and published results, covering 35 planets in 18 planetar…
The 3D morphology of open clusters in the solar neighborhood: III. Fractal dimension of open clusters
Vallenari, A.; Kouwenhoven, M. B. N.; Pasquato, M. +2 more
We analyzed the fractal dimension of open clusters using 3D spatial data from Gaia DR 3 for 93 open clusters from Pang et al. and 127 open clusters from Hunt & Reffert mainly within 500 pc. The box-counting method was adopted to calculate the fractal dimension of each cluster in three regions: the all-member region, r ≤ rt (inside t…
Uniform characterization of an ensemble of main-sequence benchmark stars: effect of Gaia-based data on grid search models
Nsamba, Benard; Weiss, Achim; Kamulali, Juma
The inference of stellar parameters (such as radius and mass) through asteroseismic forward modelling depends on the number, accuracy, and precision of seismic and atmospheric constraints. ESA's Gaia space mission is providing precise parallaxes which yield an additional constraint to be included in the model grid search. Using a handful of main-s…
Discovery of 226 δ γ
Zhou, Ai-Ying
We present the discovery of 269 pulsating variable stars of