Kavli Affiliate: Gabor Furesz | First 5 Authors: Robert A. Simcoe, Masafusa Onoue, Anna-Christina Eilers, Eduardo Banados, Thomas J. Cooper | Summary: We analyze relative abundances and ionization conditions in a strong absorption system at z=6.84, seen in the spectrum of the z=7.54 background quasar ULAS J134208.10+092838.61. Singly ionized C, Si, Fe, Mg, and Al […]

Kavli Affiliate: Anna Frebel | First 5 Authors: Guilherme Limberg, Silvia Rossi, Timothy C. Beers, Hélio D. Perottoni, Angeles Pérez-Villegas | Summary: We analyze the dynamical properties of $sim$1500 very metal-poor (VMP; [Fe/H] $lesssim -2.0$) halo stars, based primarily on medium-resolution spectroscopic data from the HK and Hamburg/ESO surveys. These data, collected over the past […]

Kavli Affiliate: David P. Huenemoerder | First 5 Authors: Joy S. Nichols, Yael Naze, David P. Huenemoerder, Anthony F. J. Moffat, Nathan Miller | Summary: Analysis of the recent long exposure Chandra X-ray observation of the early-type O star zeta Pup shows clear variability with a period previously reported in optical photometric studies. These 813 […]

Kavli Affiliate: Christopher J. Burke | First 5 Authors: Douglas A. Caldwell, Peter Tenenbaum, Joseph D. Twicken, Jon M. Jenkins, Eric Ting | Summary: We report the delivery to the Mikulski Archive for Space Telescopes of target pixel and light curve files for up to 160,000 targets selected from full-frame images (FFI) for each TESS […]

Kavli Affiliate: Max Tegmark | First 5 Authors: Ziming Liu, Max Tegmark, , , | Summary: We present AI Poincar’e, a machine learning algorithm for auto-discovering conserved quantities using trajectory data from unknown dynamical systems. We test it on five Hamiltonian systems, including the gravitational 3-body problem, and find that it discovers not only all […]

Kavli Affiliate: Kiyoshi Masui | First 5 Authors: Shriharsh P. Tendulkar, Armando Gil de Paz, Aida Yu. Kirichenko, Jason W. T. Hessels, Mohit Bhardwaj | Summary: Fast Radio Burst FRB 20180916B in its host galaxy SDSS J015800.28+654253.0 at 149 Mpc is by far the closest-known FRB with a robust host galaxy association. The source also […]

Kavli Affiliate: Paul L. Schechter | First 5 Authors: Anowar J. Shajib, Eden Molina, Adriano Agnello, Peter R. Williams, Simon Birrer | Summary: We report upon three years of follow-up and confirmation of doubly imaged quasar lenses through imaging campaigns from 2016-2018 with the Near-Infrared Camera2 (NIRC2) on the W. M. Keck Observatory. A sample […]

Kavli Affiliate: J. S. Villasenor | First 5 Authors: J. Fernando Barbero G., Bogar Díaz, Juan Margalef-Bentabol, Eduardo J. S. Villaseñor, | Summary: We discuss a simple symplectic formulation for tetrad gravity that leads to the real Ashtekar variables in a direct and transparent way. It also sheds light on the role of the Immirzi […]

Kavli Affiliate: Robert F. Goeke | First 5 Authors: William C. Waalkes, Zachory K. Berta-Thompson, Karen A. Collins, Adina D. Feinstein, Benjamin M. Tofflemire | Summary: We report the discovery and validation of TOI 122b and TOI 237b, two warm planets transiting inactive M dwarfs observed by textit{TESS}. Our analysis shows TOI 122b has a […]

Kavli Affiliate: Anna Frebel | First 5 Authors: Kaley Brauer, Alexander P. Ji, Maria R. Drout, Anna Frebel, | Summary: It is unclear if neutron star mergers can explain the observed r-process abundances of metal-poor stars. Collapsars, defined here as rotating massive stars whose collapse results in a rapidly accreting disk around a black hole […]