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Newly detected open clusters in the Galactic disk using Gaia EDR3
Hao, C. J.; Xu, Y.; Lin, Z. H. +3 more
The astrometric satellite Gaia recently released part of its third data set, which provides a good opportunity to hunt for more open clusters in the Milky Way. In this work, we conduct a blind search for open clusters in the Galactic disk using a sample-based clustering search method with high spatial resolution, which is especially suited to find…
A Disk Instability Model for the Quasi-periodic Eruptions of GSN 069
Li, Shuang-Liang; Miniutti, Giovanni; Cao, Xinwu +2 more
GSN 069 is a recently discovered quasi-periodic eruption (QPE) source recurring about every 9 hr. The mechanism for the QPEs of GSN 069 is still unclear. In this work, a disk instability model is constructed to explain GSN 069 based on Pan et al. (PLC21), where the authors proposed a toy model for the repeating changing-look active galactic nuclei…
Results from The COPAINS Pilot Survey: four new BDs and a high companion detection rate for accelerating stars
Sozzetti, A.; Scholz, A.; Desidera, S. +7 more
The last decade of direct imaging (DI) searches for sub-stellar companions has uncovered a widely diverse sample that challenges the current formation models, while highlighting the intrinsically low occurrence rate of wide companions, especially at the lower end of the mass distribution. These results clearly show how blind surveys, crucial to co…
A tentative detection of He I in the atmosphere of GJ 1214 b
Sánchez-López, A.; López-Puertas, M.; Nagel, E. +27 more
The He I λ10833 Å triplet is a powerful tool for characterising the upper atmosphere of exoplanets and tracing possible mass loss. Here, we analysed one transit of GJ 1214 b observed with the CARMENES high-resolution spectrograph to study its atmosphere via transmission spectroscopy around the He I triplet. Although previous studies using lower re…
A 20 Second Cadence View of Solar-type Stars and Their Planets with TESS: Asteroseismology of Solar Analogs and a Recharacterization of π Men c
Barclay, Thomas; Chaplin, William J.; Hermes, J. J. +50 more
We present an analysis of the first 20 second cadence light curves obtained by the TESS space telescope during its extended mission. We find improved precision of 20 second data compared to 2 minute data for bright stars when binned to the same cadence (≈10%-25% better for T ≲ 8 mag, reaching equal precision at T ≈ 13 mag), consistent with pre-fli…
Characterizing epochs of star formation across the Milky Way disc using age-metallicity distributions of GALAH stars
Feuillet, Diane K.; Feltzing, Sofia; Sahlholdt, Christian L.
We provide a detailed map of the ages and metallicities of turn-off stars in the Milky Way disc based on data from GALAH DR3 and Gaia EDR3. From this map, we identify previously undetected features in the age-metallicity distribution of disc stars and interpret these results as indicating a three-phase formation history of the Milky Way. In the fi…
Irradiation-driven escape of primordial planetary atmospheres. II. Evaporation efficiency of sub-Neptunes through hot Jupiters
Haardt, Francesco; Rauscher, Emily; Malsky, Isaac +3 more
Making use of the publicly available 1D photoionization hydrodynamics code ATES we set out to investigate the combined effects of specific planetary gravitational potential energy (ϕp ≡ GMp/Rp) and stellar X-ray and extreme ultraviolet (XUV) irradiation (FXUV) on the evaporation efficiency (η) of moderat…
Multiple phase spirals suggest multiple origins in Gaia DR3
Price-Whelan, Adrian M.; Johnston, Kathryn V.; Darragh-Ford, Elise +1 more
Gaia Data Release 2 revealed that the Milky Way contains significant indications of departures from equilibrium in the form of asymmetric features in the phase space density of stars in the Solar neighbourhood. One such feature is the z-vz phase spiral, interpreted as the response of the disc to the influence of a perturbation perpendic…
CLEAR: The Ionization and Chemical-enrichment Properties of Galaxies at 1.1 < z < 2.3
Papovich, Casey; Finkelstein, Steven L.; Cleri, Nikko J. +15 more
We use deep spectroscopy from the Hubble Space Telescope Wide-Field-Camera 3 IR grisms combined with broadband photometry to study the stellar populations, gas ionization and chemical abundances in star-forming galaxies at z ~ 1.1-2.3. The data stem from the CANDELS Lyα Emission At Reionization (CLEAR) survey. At these redshifts, the grism spectro…
Photometry and astrometry with JWST - I. NIRCam point spread functions and the first JWST colour-magnitude diagrams of a globular cluster
Salaris, M.; Bedin, L. R.; Nardiello, D. +4 more
As the James Webb Space Telescope (JWST) has become fully operational, early release data are now available to begin building the tools and calibrations for precision point-source photometry and astrometry in crowded cluster environments. Here, we present our independent reduction of NIRCam imaging of the metal-poor globular cluster M 92, which we…