Search Publications
Characterization of a Set of Small Planets with TESS and CHEOPS and an Analysis of Photometric Performance
Torres, Guillermo; Bieryla, Allyson; Stassun, Keivan G. +41 more
The radius valley carries implications for how the atmospheres of small planets form and evolve, but this feature is visible only with highly precise characterizations of many small planets. We present the characterization of nine planets and one planet candidate with both NASA TESS and ESA CHEOPS observations, which adds to the overall population…
Properties of luminous red supergiant stars in the Magellanic Clouds
Boutsia, K.; Zapartas, E.; de Wit, S. +5 more
Context. There is evidence that some red supergiants (RSGs) experience short-lived phases of extreme mass loss, producing copious amounts of dust. These episodic outburst phases help strip the hydrogen envelope from evolved massive stars, drastically affecting their evolution. However, to date, the observational data of episodic mass loss is limit…
Beyond the ultradeep frontier fields and legacy observations (BUFFALO): a high-resolution strong+weak-lensing view of Abell 370
Sharon, K.; Diego, J. M.; Zitrin, A. +16 more
The HST treasury programme BUFFALO provides extended wide-field imaging of the six Hubble Frontier Fields galaxy clusters. Here we present the combined strong and weak-lensing analysis of Abell 370, a massive cluster at z = 0.375. From the reconstructed total projected mass distribution in the 6 arcmin × 6 arcmin BUFFALO field-of-view, we obtain t…
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 …