Astrophysical Distance Scale VII: A Self-Consistent, Multi-Wavelength Calibration of the Slopes and Relative Zero Points for the Run of Luminosity with Color of Stars Defining the Tip of the Red Giant Branch

Posted by dbos Chicago

Kavli Affiliate: Wendy L. Freedman | First 5 Authors: Barry F. Madore, Wendy L. Freedman, Kayla Owens, , | Summary: Given the recent successful launch of the James Webb Space Telescope, determining robust calibrations of the slopes and absolute magnitudes of the near- to mid-infrared Tip of the Red Giant Branch (TRGB) will be essential […]


Continue.. Astrophysical Distance Scale VII: A Self-Consistent, Multi-Wavelength Calibration of the Slopes and Relative Zero Points for the Run of Luminosity with Color of Stars Defining the Tip of the Red Giant Branch

The Strength and Variability of the Helium 10830 Å Triplet in Young Stars, with Implications for Exosphere Detection

Posted by dbos MIT

Kavli Affiliate: Andrew Vanderburg | First 5 Authors: Daniel M. Krolikowski, Adam L. Kraus, Benjamin M. Tofflemire, Caroline V. Morley, Andrew W. Mann | Summary: Young exoplanets trace planetary evolution, particularly the atmospheric mass loss that is most dynamic in youth. However, the high activity level of young stars can mask or mimic the spectroscopic […]


Continue.. The Strength and Variability of the Helium 10830 Å Triplet in Young Stars, with Implications for Exosphere Detection

Cavity Soliton-Induced Topological Edge States

Posted by dbos Caltech

Kavli Affiliate: Alireza Marandi | First 5 Authors: Christian R. Leefmans, Nicolas Englebert, James Williams, Robert M. Gray, Nathan Goldman | Summary: Over the past decade, cavity solitons have attracted substantial attention for their rich dynamics and their myriad potential applications. Recently, there has been growing interest in understanding cavity solitons in systems of coupled […]


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The High Energy X-ray Probe (HEX-P): resolving the nature of Sgr A* flares, compact object binaries and diffuse X-ray emission in the Galactic Center and beyond

Posted by dbos MIT

Kavli Affiliate: Melania Nynka | First 5 Authors: Kaya Mori, Gabriele Ponti, Matteo Bachetti, Arash Bodaghee, Jonathan Grindlay | Summary: HEX-P is a probe-class mission concept that will combine high spatial resolution X-ray imaging ($<10"$ FWHM) and broad spectral coverage (0.2-80 keV) with an effective area far superior to current facilities’ (including XMM-Newton and NuSTAR). […]


Continue.. The High Energy X-ray Probe (HEX-P): resolving the nature of Sgr A* flares, compact object binaries and diffuse X-ray emission in the Galactic Center and beyond

Learning to Control under Uncertainty with Data-Based Iterative Linear Quadratic Regulator

Posted by dbos Peking

Kavli Affiliate: Ran Wang | First 5 Authors: Ran Wang, Raman Goyal, Suman Chakravorty, , | Summary: This paper studies the learning-to-control problem under process and sensing uncertainties for dynamical systems. In our previous work, we developed a data-based generalization of the iterative linear quadratic regulator (iLQR) to design closed-loop feedback control for high-dimensional dynamical […]


Continue.. Learning to Control under Uncertainty with Data-Based Iterative Linear Quadratic Regulator

The High Energy X-ray Probe (HEX-P): Bringing the Cosmic X-ray Background into Focus

Posted by dbos Peking

Kavli Affiliate: Claudio Ricci | First 5 Authors: Francesca Civano, Xiurui Zhao, Peter Boorman, Stefano Marchesi, Tonima Ananna | Summary: Since the discovery of the cosmic X-ray background (CXB), astronomers have strived to understand the accreting supermassive black holes (SMBHs) contributing to its peak in the 10-40 keV band. Existing soft X-ray telescopes could study […]


Continue.. The High Energy X-ray Probe (HEX-P): Bringing the Cosmic X-ray Background into Focus

The High Energy X-ray Probe (HEX-P): Bringing the Cosmic X-ray Background into focus

Posted by dbos Peking

Kavli Affiliate: Claudio Ricci | First 5 Authors: Francesca Civano, Xiurui Zhao, Peter Boorman, Stefano Marchesi, Tonima Ananna | Summary: Since the discovery of the Cosmic X-ray Background, astronomers have strived to understand the accreting super massive black holes contributing to its peak in the 10-40 keV band. Existing soft X-ray telescopes could study this […]


Continue.. The High Energy X-ray Probe (HEX-P): Bringing the Cosmic X-ray Background into focus

The High Energy X-ray Probe (HEX-P): Supernova remnants, pulsar wind nebulae, and nuclear astrophysics

Posted by dbos MIT

Kavli Affiliate: Melania Nynka | First 5 Authors: Stephen Reynolds, Hongjun An, Moaz Abdelmaguid, Jason Alford, Chris L. Fryer | Summary: HEX-P is a probe-class mission concept that will combine high spatial resolution X-ray imaging ($<10"$ full width at half maximum) and broad spectral coverage (0.2–80 keV) with an effective area far superior to current […]


Continue.. The High Energy X-ray Probe (HEX-P): Supernova remnants, pulsar wind nebulae, and nuclear astrophysics

The High Energy X-ray Probe (HEX-P): Supernova remnants, pulsar wind nebulae, and nuclear astrophysics

Posted by dbos MIT

Kavli Affiliate: Melania Nynka | First 5 Authors: Stephen Reynolds, Hongjun An, Moaz Abdelmaguid, Jason Alford, Chris L. Fryer | Summary: HEX-P is a probe-class mission concept that will combine high spatial resolution X-ray imaging ($<10"$ full width at half maximum) and broad spectral coverage (0.2–80 keV) with an effective area far superior to current […]


Continue.. The High Energy X-ray Probe (HEX-P): Supernova remnants, pulsar wind nebulae, and nuclear astrophysics

X-Ray Polarized View on the Accretion Geometry in the X-Ray Binary Circinus X-1

Posted by dbos MIT

Kavli Affiliate: Herman L. Marshall | First 5 Authors: John Rankin, Fabio La Monaca, Alessandro Di Marco, Juri Poutanen, Anna Bobrikova | Summary: Cir X-1 is a neutron star X-ray binary characterized by strong variations in flux during its eccentric $sim$16.6 days orbit. There are also strong variations in the spectral state, and historically it […]


Continue.. X-Ray Polarized View on the Accretion Geometry in the X-Ray Binary Circinus X-1