MIT – Kavli Institute Pre-Print Publications

XRISM Pre-Pipeline and Singularity: Container-Based Data Processing for the X-Ray Imaging and Spectroscopy Mission and High-Performance Computing

Posted by klaurent July 24, 2025July 28, 2025MIT, This Week: Astrophysics

Kavli Affiliate: Eric D. Miller | First 5 Authors: Satoshi Eguchi, Satoshi Eguchi, , , | Summary: The X-Ray Imaging and Spectroscopy Mission (XRISM) is the seventh Japanese X-ray observatory whose development and operation are in collaboration with universities and research institutes in Japan, the United States, and Europe, including JAXA, NASA, and ESA. The […]

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Stellar Mass-Dispersion Measure Correlations Constrain Baryonic Feedback in Fast Radio Burst Host Galaxies

Posted by klaurent July 22, 2025July 28, 2025MIT, This Week: Astrophysics

Kavli Affiliate: Kiyoshi W. Masui | First 5 Authors: Calvin Leung, Calvin Leung, , , | Summary: Low redshift fast radio bursts (FRBs) provide robust measurements of the host-galaxy contribution to the dispersion measure (DM), which can constrain the circumgalactic medium (CGM) of the hosts. We curate a sample of 20 nearby FRBs with low […]

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The THESAN project: environmental drivers of Local Group reionization

Posted by klaurent July 22, 2025July 28, 2025MIT, This Week: Astrophysics

Kavli Affiliate: Mark Vogelsberger | First 5 Authors: Yu Zhao, Yu Zhao, , , | Summary: The timing of cosmic reionization across Local Group (LG) analogues provides insights into their early histories and surrounding large-scale structure. Using the radiation-hydrodynamic simulation THESAN-1 and its dark matter-only counterpart THESAN-DARK-1, we track the reionization histories of all haloes, […]

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Updated Masses for the Gas Giants in the Eight-Planet Kepler-90 System Via Transit-Timing Variation and Radial Velocity Observations

Posted by klaurent July 18, 2025July 28, 2025MIT

Kavli Affiliate: Avi Shporer | First 5 Authors: David E. Shaw, David E. Shaw, , , | Summary: The eight-planet Kepler-90 system exhibits the greatest multiplicity of planets found to date. All eight planets are transiting and were discovered in photometry from the NASA Kepler primary mission. The two outermost planets, g ($P_g$ = 211 […]

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Supersonic Turbulence in Primordial Halos: A Comparison With and Without The Stream Velocity

Posted by klaurent July 17, 2025July 28, 2025MIT

Kavli Affiliate: Mark Vogelsberger | First 5 Authors: Avi Chen, Avi Chen, , , | Summary: Turbulence plays a critical role in regulating star formation in molecular clouds and is also observed in simulations of primordial halos that host Population III (Pop III) stars. The relative velocity between baryons and dark matter at the time […]

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Hidden diffeos in the Hamiltonian formulation of a background independent field theory

Posted by klaurent July 16, 2025July 28, 2025MIT

Kavli Affiliate: J. S. Villasenor | First 5 Authors: J. Fernando Barbero G., J. Fernando Barbero G., , , | Summary: We analyze from a geometric perspective the Hamiltonian formulation of a recent modification of the Husain-Kuchavr model where, while preserving the connection as a dynamical variable, the other field is restricted to be the […]

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High-redshift AGN population in radiation-hydrodynamics simulations

Posted by klaurent July 15, 2025July 28, 2025MIT

Kavli Affiliate: Mark Vogelsberger | First 5 Authors: Teodora-Elena Bulichi, Teodora-Elena Bulichi, , , | Summary: High-redshift active galactic nuclei (AGN) have long been recognized as key probes of early black hole growth and galaxy evolution. However, modeling this population remains difficult due to the wide range of luminosities and black hole masses involved, and […]

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A New Brown Dwarf Orbiting an M star and An Investigation on the Eccentricity Distribution of Transiting Long-Period Brown Dwarfs

Posted by klaurent July 13, 2025MIT

Kavli Affiliate: Sara Seager | First 5 Authors: , , , , | Summary: The orbital eccentricities of brown dwarfs encode valuable information of their formation and evolution history, providing insights into whether they resemble giant planets or stellar binaries. Here, we report the discovery of TOI-5575b, a long-period, massive brown dwarf orbiting a low-mass […]

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Universal energy limits of radiation belts in planetary and brown dwarf magnetospheric systems

Posted by klaurent July 10, 2025July 21, 2025MIT

Kavli Affiliate: George Clark | First 5 Authors: Drew L. Turner, Drew L. Turner, , , | Summary: Radiation belts are regions of magnetically trapped particle radiation found around all of the sufficiently magnetized planets in the Solar System and recently also observed around brown dwarfs, yet despite their ubiquity, there is not yet a […]

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Broad-band Spectral Modeling of Prompt Emission from Gamma-Ray Bursts Observed by the Transiting Exoplanet Survey Satellite

Posted by klaurent July 8, 2025MIT

Kavli Affiliate: Michael Fausnaugh | First 5 Authors: Rahul Jayaraman, Rahul Jayaraman, , , | Summary: Optical observations of gamma-ray bursts (GRBs) contemporaneous with their prompt high-energy emission are rare, but they can provide insights into the physical processes underlying these explosive events. The Transiting Exoplanet Survey Satellite’s (TESS) large field of view and continuous […]

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