Stellar magnetic fields have a major impact on space weather around exoplanets orbiting low-mass stars. From an analysis of Zeeman-broadened Fe I lines measured in near-infrared SDSS/APOGEE spectra, mean magnetic […]
MARCS
Posted inAstrochemistry, Astrogeology, Exoplanets, -moons, -comets, Gas Giants, Status Report
The Wanderer: Charting WASP-77A b’s Formation and Migration Using a System-Wide Inventory of Carbon and Oxygen Abundances
The elemental and isotopic abundances of volatiles like carbon, oxygen, and nitrogen may trace a planet’s formation location relative to H2O, CO2, CO, NH3, and N2 “snowlines”, or the distance […]
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Magnetic Fields, Electromagnetism, bioelectricity,, Status Report, Stellar Cartography
Magnetic Fields of M Dwarfs from the Pleiades Open Cluster
Average magnetic field measurements are presented for 62 M-dwarf members of the Pleiades open cluster, derived from Zeeman-enhanced Fe I lines in the H-band. An MCMC methodology was employed to […]
Posted inAstrochemistry, Astronomy & Telescopes, Imaging & Spectroscopy, Status Report
Non-LTE Abundances Of Nitrogen In The Sun And Reference A-F Type Stars
A new model atom of nitrogen was developed using the energy levels of N I from laboratory measurements and also predicted in atomic structure calculations and the most up-to-date atomic […]