Kavli Affiliate: Anna Frebel | First 5 Authors: Mohammad K. Mardini, Anna Frebel, Anirudh Chiti, Yohai Meiron, Kaley V. Brauer | Summary: We have developed a chemo-dynamical approach to assign 36,010 metal-poor SkyMapper stars to various Galactic stellar populations. Using two independent techniques (velocity and action space behavior), $Gaia$ EDR3 astrometry, and photometric metallicities, we […]
Kavli Affiliate: Herman L. Marshall | First 5 Authors: Victor Doroshenko, Juri Poutanen, Sergey Tsygankov, Valery Suleimanov, Matteo Bachetti | Summary: Using observations of X-ray pulsar Her X-1 by the Imaging X-ray Polarimetry Explorer, we report on a highly significant detection of the polarization signal from an accreting neutron star. The observed degree of the […]
Kavli Affiliate: Anna Frebel | First 5 Authors: Kaley Brauer, Hillary D. Andales, Alexander P. Ji, Anna Frebel, Mohammad K. Mardini | Summary: The Milky Way has accreted many ultra-faint dwarf galaxies (UFDs), and stars from these galaxies can be found throughout our Galaxy today. Studying these stars provides insight into galaxy formation and early […]
Kavli Affiliate: George R. Ricker | First 5 Authors: Elisabeth R. Newton, Rayna Rampalli, Adam L. Kraus, Andrew W. Mann, Jason L. Curtis | Summary: The public, all-sky surveys Gaia and TESS provide the ability to identify new young associations and determine their ages. These associations enable study of planetary evolution by providing new opportunities […]
Kavli Affiliate: Gabor Furesz | First 5 Authors: Elisabeth R. Newton, Rayna Rampalli, Adam L. Kraus, Andrew W. Mann, Jason L. Curtis | Summary: The public, all-sky surveys Gaia and TESS provide the ability to identify new young associations and determine their ages. These associations enable study of planetary evolution by providing new opportunities to […]
Kavli Affiliate: Mark Vogelsberger | First 5 Authors: Sergey Khoperskov, Ivan Minchev, Noam Libeskind, Vasily Belokurov, Matthias Steinmetz | Summary: Since the chemical abundances of stars are the fossil records of the physical conditions in galaxies, they provide the key information for recovering the assembly history of galaxies. In this work, we explore the chemo-chrono-kinematics […]
Kavli Affiliate: Mark Vogelsberger | First 5 Authors: Sergey Khoperskov, Ivan Minchev, Noam Libeskind, Vasily Belokurov, Matthias Steinmetz | Summary: Since the chemical abundances of stars are the fossil records of the physical conditions in galaxies, they provide the key information for recovering the assembly history of galaxies. In this work, we explore the chemo-chrono-kinematics […]
Kavli Affiliate: David P. Huenemoerder | First 5 Authors: Sean J. Gunderson, Kenneth G. Gayley, Pragati Pradhan, David P. Huenemoerder, Nathan A. Miller | Summary: We fit a new line shape model to textit{Chandra} X-ray spectra of the O supergiant $zeta$ Puppis to test the robustness of mass-loss rates derived from X-ray wind line profiles […]
Kavli Affiliate: Ronald A. Remillard | First 5 Authors: Megan Masterson, Erin Kara, Claudio Ricci, Javier A. García, Andrew C. Fabian | Summary: 1ES 1927+654 is a paradigm-defying AGN and one of the most peculiar X-ray nuclear transients. In early 2018, this well-known AGN underwent a changing-look event, in which broad optical emission lines appeared […]
Kavli Affiliate: Anna Frebel | First 5 Authors: Anirudh Chiti, Joshua D. Simon, Anna Frebel, Andrew B. Pace, Alexander P. Ji | Summary: We present a chemodynamical study of the Grus I ultra-faint dwarf galaxy (UFD) from medium-resolution ($Rsim11,000$) Magellan/IMACS spectra of its individual member stars. We identify eight confirmed members of Grus I, based […]