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GJ 806 (TOI-4481): A bright nearby multi-planetary system with a transiting hot low-density super-Earth
Amado, P. J.; Caballero, J. A.; Reiners, A. +63 more
One of the main scientific goals of the TESS mission is the discovery of transiting small planets around the closest and brightest stars in the sky. Here, using data from the CARMENES, MAROON-X, and HIRES spectrographs together with TESS, we report the discovery and mass determination of aplanetary system around the M1.5 V star GJ 806 (TOI-4481). …
Large Interferometer For Exoplanets (LIFE). X. Detectability of currently known exoplanets and synergies with future IR/O/UV reflected-starlight imaging missions
Beichman, Charles A.; García Muñoz, Antonio; Stapelfeldt, Karl R. +10 more
Context. The next generation of space-based observatories will characterize the atmospheres of low-mass, temperate exoplanets with the direct-imaging technique. This will be a major step forward in our understanding of exoplanet diversity and the prevalence of potentially habitable conditions beyond the Earth.
Aims: We compute a list of curre…
r-process Abundance Patterns in the Globular Cluster M92
Kovalev, Mikhail; Ji, Alexander P.; Kirby, Evan N.
Whereas light-element abundance variations are a hallmark of globular clusters, there is little evidence for variations in neutron-capture elements. A significant exception is M15, which shows a star-to-star dispersion in neutron-capture abundances of at least one order of magnitude. The literature contains evidence both for and against a neutron-…
SPYGLASS. IV. New Stellar Survey of Recent Star Formation within 1 kpc
Rizzuto, Aaron C.; Kraus, Adam L.; Kerr, Ronan
Young stellar populations provide a powerful record that traces millions of years of star formation history in the solar neighborhood. Using a revised form of the SPYGLASS young star identification methodology, we produce an expanded census of nearby young stars (age < 50 Myr). We then use the HDBSCAN clustering algorithm to produce a new SPYGL…
How close dark matter haloes and MOND are to each other: three-dimensional tests based on Gaia DR2
Huang, Yang; Chang, Liang; Dong, Xiao-Bo +7 more
Aiming at discriminating different gravitational potential models of the Milky Way, we perform tests based on the kinematic data powered by the Gaia DR2 astrometry over a large range of (R, z) locations. Invoking the complete form of Jeans equations that admit three integrals of motion, we use the independent R- and z-directional equations as two …
Stellar Parameters and Chemical Abundances Estimated from LAMOST-II DR8 MRS Based on Cycle-StarNet
Ting, Yuan-Sen; Luo, A. -Li; Zhang, Shuo +3 more
Deriving stellar atmospheric parameters and chemical abundances from stellar spectra is crucial for understanding the evolution of the Milky Way. By performing a fitting with MARCS model atmospheric theoretical synthetic spectra combined with a domain-adaptation method, we estimate the fundamental stellar parameters (T eff, log g, [Fe/H…
Discovery of an Exceptional Optical Nebulosity in the Suspected Galactic SN Iax Remnant Pa 30 Linked to the Historical Guest Star of 1181 CE
Schaefer, Bradley E.; Fesen, Robert A.; Patchick, Dana
A newly recognized young Galactic supernova (SN) remnant, Pa 30 (G123.1+4.6), centered on a hot central star with a ~16,000 km s-1 wind velocity, has recently been proposed to be the result of a double-degenerate merger leading to an SN Iax event associated with the guest star of 1181 CE. Here we present deep optical [S II] λλ6716,6731 …
Asteroseismology and Spectropolarimetry of the Exoplanet Host Star λ Serpentis
Li, Yaguang; Ayres, Thomas R.; Kochukhov, Oleg +31 more
The bright star λ Ser hosts a hot Neptune with a minimum mass of 13.6 M ⊕ and a 15.5 day orbit. It also appears to be a solar analog, with a mean rotation period of 25.8 days and surface differential rotation very similar to the Sun. We aim to characterize the fundamental properties of this system and constrain the evolutionary pathway …
Probing the Star Formation Main Sequence Down to 108 M ⊙ at 1.0 < z < 3.0
Barro, Guillermo; Pérez-González, Pablo G.; Costantin, Luca +8 more
We investigate the star formation main sequence (MS; SFR-M ⋆) down to 108-9 M ⊙ using a sample of 34,061 newly discovered ultrafaint (27 mag ≲ i ≲ 30 mag) galaxies at 1 < z < 3 detected in the GOODS-N field. Virtually none of these galaxies are contained in previous public catalogs, effectively doubling the n…
Formation of hub-filament structure triggered by a cloud-cloud collision in the W33 complex
Liu, Hong-Li; Liu, Tie; Li, Shanghuo +6 more
Hub-filament systems are suggested to be the birth cradles of high-mass stars and clusters, but the formation of hub-filament structure is still unclear. Using FUGIN 13CO (1-0), C18O (1-0) and SEDIGISM 13CO (2-1) survey data, we investigate the formation of hub-filament structure in the W33 complex. The W33 complex…