José G. Fernández-Trincado et al 2021 ApJL 908 L42
New abundance analysis shows VVV CL001 is one of the most metal-deficient clusters in our galaxy, indicating it could be an ancient fossil relic left behind by a massive merger event early in our galaxy’s evolution.
Florian Peißker et al 2021 ApJ 909 62
New multiwavelength analysis of the dusty and gaseous bow shock source X7 indicate that this is a dust-enshrouded stellar object that is interacting with a nuclear wind arising from the supermassive black hole Sgr A*.
Ceri Nunn et al 2021 Planet. Sci. J. 2 36
Estimates show a proposed microseismometer placed on the Moon could detect ~74 moonquakes and impacts above a signal-to-noise ratio of 2.5 in its first year, providing valuable insight into the lunar interior.
Josephine Fenske et al 2021 AJ 161 156
A runaway B-type star is identified that may have originated in the high-mass star-forming region NGC 7538, forming one of the ~500 solar-mass elliptical ring structures seen there via its stellar wind.
Debora Pelliccia et al 2021 ApJL 908 L30
A new, spectroscopically confirmed strong-Lyα-emitting primeval galaxy at z = 7.03 shows two distinct components that may represent two stellar populations, possibly due to rejuvenation or merging events.
Fei Wang and Jinping He 2021 ApJ 909 9
The red edge, a spectral fingerprint of light-harvesting vegetation, shows significant diurnal variation on Earth, suggesting it won’t be efficiently detectable on exoplanets without proper observing geometry conditions and time.