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Dynamics of Four Triple Systems
Tokovinin, Andrei
Orbital motions in four hierarchical stellar systems discovered by speckle interferometry are studied. Their inner orbits are relatively well constrained, while the long outer orbits are less certain. The eccentric and misaligned inner orbits in the early-type hierarchies ϵ Cha (B9V, central star of the 5 Myr old association, P = 6.4 yr, e = 0.73)…
VaTEST. II. Statistical Validation of 11 TESS-detected Exoplanets Orbiting K-type Stars
Triaud, Amaury H. M. J.; Bieryla, Allyson; Littlefield, Colin +48 more
NASA's Transiting Exoplanet Survey Satellite (TESS) is an all-sky survey mission designed to find transiting exoplanets orbiting nearby bright stars. It has identified more than 329 transiting exoplanets, and almost 6000 candidates remain unvalidated. In this manuscript, we discuss the findings from the ongoing Validation of Transiting Exoplanets …
Age Distribution of Exoplanet Host Stars: Chemical and Kinematic Age Proxies from GAIA DR3
Manoj, P.; Narang, Mayank; Swastik, C. +4 more
The GAIA space mission is impacting astronomy in many significant ways by providing a uniform, homogeneous, and precise data set for over 1 billion stars and other celestial objects in the Milky Way and beyond. Exoplanet science has greatly benefited from the unprecedented accuracy of the stellar parameters obtained from GAIA. In this study, we co…
Metallicity-PAH Relation of MIR-selected Star-forming Galaxies in AKARI North Ecliptic Pole-wide Survey
Hashimoto, Tetsuya; Jeong, Woong-Seob; Hwang, Ho Seong +9 more
We investigate the variation in the mid-infrared spectral energy distributions of 373 low-redshift (z < 0.4) star-forming galaxies, which reflects a variety of polycyclic aromatic hydrocarbon (PAH) emission features. The relative strength of PAH emission is parameterized as q PAH, which is defined as the mass fraction of PAH particle…
MagAO-X and HST High-contrast Imaging of the AS209 Disk at Hα
Edwards, Suzan; Zhou, Yifan; Bae, Jaehan +22 more
The detection of emission lines associated with accretion processes is a direct method for studying how and where gas giant planets form, how young planets interact with their natal protoplanetary disk, and how volatile delivery to their atmosphere takes place. Hα (λ = 0.656 µm) is expected to be the strongest accretion line observable from …
The On-orbit Performance of the Colorado Ultraviolet Transit Experiment Mission
France, Kevin; Fleming, Brian; Nell, Nicholas +5 more
We present the on-orbit performance of the Colorado Ultraviolet Transit Experiment (CUTE). CUTE is a 6U CubeSat that launched on 2021 September 27 and is obtaining near-ultraviolet (NUV; 2480 Å-3306 Å) transit spectroscopy of short-period exoplanets. The instrument comprises a 20 cm × 8 cm rectangular Cassegrain telescope, an NUV spectrograph with…
SPar: Estimating Stellar Parameters from Multiband Photometries with Empirical Stellar Libraries
Yang, Ming; Chen, Bingqiu; Zhao, He +3 more
Modern large-scale photometric surveys have provided us with multiband photometries of billions of stars. Determining the stellar atmospheric parameters, such as the effective temperature (T eff) and metallicities ([Fe/H]), absolute magnitudes (M G ), distances (d), and reddening values (E(G BP - G RP))…
Giant Outer Transiting Exoplanet Mass (GOT 'EM) Survey. III. Recovery and Confirmation of a Temperate, Mildly Eccentric, Single-transit Jupiter Orbiting TOI-2010
Barclay, Thomas; Hellier, Coel; Bieryla, Allyson +48 more
Large-scale exoplanet surveys like the Transiting Exoplanet Survey Satellite (TESS) mission are powerful tools for discovering large numbers of exoplanet candidates. Single-transit events are commonplace within the resulting candidate list due to the unavoidable limitation of the observing baseline. These single-transit planets often remain unveri…
A Survey of Herbig Ae/Be Multiplicity
Bouvier, J.; Beuzit, J. -L.; Thomas, S. J. +5 more
Although the majority of Herbig Ae/Be (HAEBE) stars are likely multiple systems, relatively few multiples have been identified. We aim to create a statistically significant survey of HAEBE multiplicity as a function of stellar mass, to shed light on mixed-mass star formation. Two independent adaptive optics IR imaging surveys were conducted, betwe…
TOI-3785 b: A Low-density Neptune Orbiting an M2-dwarf Star
Kobulnicky, Henry A.; Cochran, William D.; Mahadevan, Suvrath +19 more
Using both ground-based transit photometry and high-precision radial velocity spectroscopy, we confirm the planetary nature of TOI-3785 b. This transiting Neptune orbits an M2-Dwarf star with a period of ~4.67 days, a planetary radius of 5.14 ± 0.16 R ⊕, a mass of ${14.95}_{-3.92}^{+4.10}$ M ⊕, and a density of $\rho ={0.61}_…