Kavli Affiliate: Mark Vogelsberger | First 5 Authors: Alvaro Pozo, Tom Broadhurst, George F. Smoot, Tzihong Chiueh, Hoang Nhan Luu | Summary: Low mass galaxies in the Local Group are dominated by dark matter and comprise the well studied “dwarf Spheroidal" (dSph) class, with typical masses of $10^{9-10}M_odot$ and also the equally numerous “ultra faint […]
Kavli Affiliate: Ronald A. Remillard | First 5 Authors: Benjamin J. Ricketts, James F. Steiner, Cecilia Garraffo, Ronald A. Remillard, Daniela Huppenkothen | Summary: Black hole X-ray binary systems (BHBs) contain a close companion star accreting onto a stellar-mass black hole. A typical BHB undergoes transient outbursts during which it exhibits a sequence of long-lived […]
Kavli Affiliate: Ronald A. Remillard | First 5 Authors: Erin Barillier, Victoria Grinberg, David Horn, Michael A. Nowak, Ronald A. Remillard | Summary: 4U 1957+11 is a black hole candidate system that has been in a soft X-ray spectral state since its discovery. We present analyses of recent joint NICER and NuSTAR spectra, which are […]
Kavli Affiliate: Sara Seager | First 5 Authors: Dominic Oddo, Diana Dragomir, Alexis Brandeker, Hugh P. Osborn, Karen Collins | Summary: The radius valley carries implications for how the atmospheres of small planets form and evolve, but this feature is visible only with highly precise characterizations of many small planets. We present the characterization of […]
Kavli Affiliate: Dheeraj Pasham | First 5 Authors: Andrew Mummery, Thomas Wevers, Richard Saxton, Dheeraj Pasham, | Summary: We perform a comprehensive analysis of a population of 19 X-ray bright tidal disruption events (TDEs), fitting their X-ray spectra with a new, physically self consistent, relativistic accretion disc model. Not all of the TDEs inhabit regions […]
Kavli Affiliate: Saul A. Rappaport | First 5 Authors: Iminhaji Ablimit, Philipp Podsiadlowski, Rosanne Di Stefano, Saul A. Rappaport, James Wicker | Summary: Various white-dwarf (WD) binary scenarios have been proposed trying to understand the nature and the diversity of Type Ia supernovae (SNe Ia). In this work, we study the evolution of carbon-oxygen WD […]
Kavli Affiliate: Lee McCuller | First 5 Authors: Chris Whittle, Lee McCuller, Vivishek Sudhir, Matthew Evans, | Summary: Contemporary gravitational-wave detectors are fundamentally limited by thermal noise — due to dissipation in the mechanical elements of the test mass — and quantum noise — from the vacuum fluctuations of the optical field used to probe […]
Kavli Affiliate: Sarah N. T. Heine | First 5 Authors: Joseph S. Adams, Robert Baker, Simon R. Bandler, Noemie Bastidon, Daniel Castro | Summary: The flight of the Micro-X sounding rocket on July 22, 2018 marked the first operation of Transition-Edge Sensors and their SQUID readouts in space. The instrument combines the microcalorimeter array with […]
Kavli Affiliate: Dheeraj R. Pasham | First 5 Authors: Yanan Wang, Ranieri D. Baldi, Santiago del Palacio, Muryel Guolo, Xiaolong Yang | Summary: AT 2019avd is a nuclear transient detected from infrared to soft X-rays, though its nature is yet unclear. The source has shown two consecutive flaring episodes in the optical and the infrared […]
Kavli Affiliate: Dheeraj Pasham | First 5 Authors: Yukta Ajay, Muryel Guolo, Dheeraj Pasham, , | Summary: We present multiwavelength analyses of an active optical transient AT2021fxu which shows the appearance of previously absent broad emission lines in a recent optical spectrum, suggesting a Changing-look (CL) Active Galactic Nucleus (AGN). During the spectral transition, the […]