884 datasets found

Young, low-mass brown dwarfs orbiting early-type stars, with low mass ratios (q<~0.01), appear to be intrinsically rare and present a formation dilemma: could a handful of...

We present 1-5{mu}m spectroscopy of the coldest known brown dwarf, WISEJ085510.83-071442.5 (WISE0855), performed with the Near-Infrared Spectrograph (NIRSpec) on board the James...

We present stellar age determinations for 4661 red giant branch stars in the APO-K2 catalog, derived using mass estimates from K2 asteroseismology from the K2 Galactic...

Superpuffs are planets with exceptionally low densities ({rho}<~0.1g/cm^3^) and core masses (Mc<~5M{Earth}). Many lower-mass (Mp<~10M{Earth}) superpuffs are expected to...

Spectra of young benchmark brown dwarfs with well-known ages are vital to characterize other brown dwarfs, for which ages are in general not known. These spectra are also...

Understanding when and how circumstellar disks disperse is crucial to constrain planet formation and migration. Thermal winds powered by high-energy stellar photons have long...

We developed a tool that measures equivalent widths of various lines in low-resolution optical spectra, and it was applied to stellar spectra obtained as part of SDSS-V and...

TOI-1899b is a rare exoplanet, a temperate warm Jupiter orbiting an M-dwarf, first discovered by Canas et al. (2020) from a TESS single-transit event. Using new radial...

The carbon-to-oxygen (C/O) ratio in an exoplanet atmosphere has been suggested as a potential diagnostic of planet formation. Now that a number of exoplanets have measured C/O...

Excess infrared flux from white dwarf stars is likely to arise from a dusty debris disk or a cool companion. In this work, we present near-infrared spectroscopic observations...

We present measurements of the interferometrically resolved binary star system 12Com and the single giant star 31 Com in the cluster Coma Berenices. 12Com is a double-lined...

Near-infrared bandpasses on spaceborne observatories diverge from their ground-based counterparts as they are free of atmospheric telluric absorption. Available transformations...

V1298 Tau is a young pre-main-sequence star hosting four known exoplanets that are prime targets for transmission spectroscopy with current-generation instruments. This work...

We report on the first detailed infrared chemical analysis of five binary members (S277, S997, S975, S1031, and S1195) in the open cluster M67 (NGC2682). These stars are located...

We assemble a large sample of 12784 high-velocity stars with total velocity VGSR>~300km/s, selected from RAVE DR5, SDSS DR12, LAMOST DR8, APOGEE DR16, GALAH DR2, and Gaia...

We propose Sirius as an improved zero-point-defining star and calibrate its spectrum to an accuracy of ~0.6% in both the visible and infrared. This result is based on a newly...

This work presents ground-based spectrally resolved water emission at R=30000-100000 over infrared wavelengths covered by the JWST (2.9-12.8{mu}m). Two new surveys with iSHELL...

Benchmark brown dwarf companions with well-determined ages and model- independent masses are powerful tools to test substellar evolutionary models and probe the formation of...

Hot Jupiters orbiting extremely close to their host star may experience atmospheri; c escape due to the large amounts of high-energy radiation they receive. Understanding the...

We select and characterize a sample of massive (log(M*/M{sun})>10.6) quiescent galaxies (QGs) at 3<z<5 in the latest Cosmological Evolution Survey catalog (COSMOS2020)....