Astrophysics Publications & Preprints
Open-access astrophysical treatises published across The Astrophysical Journal Letters, Nature Astronomy, and Physical Review D. All figures, equations, BibTeX citations, and calibrated datasets are freely accessible.
Spectroscopic Confirmation of Luminous High-Redshift Galaxies at z > 14 with JWST/NIRSpec
Dr. Eleanor Vance, Ph.D., Prof. Marcus Thorne, Dr. Alistair Chen, Harvard Astrophysics Consortium • Harvard Center for Astrophysics & STScI
We present deep NIRSpec prism and grating spectroscopy targeting candidate ultra-high-redshift systems identified in the GOODS-S / JADES field. We definitively confirm the Lyman break and rest-frame ultraviolet emission lines of JADES-GS-z14-0 at a spectroscopic redshift of z = 14.320 ± 0.008, corresponding to an era just 290 million years post-Big Bang. The stellar mass (~5 × 10⁸ M☉) and ionizing UV luminosity imply unexpectedly rapid early starburst efficiencies and low dust attenuation.
Cryovolcanic Plume Gas Chromatography & Phosphorous Ion Kinetics of Enceladus's Subsurface Ocean
Dr. Maya Lin, Ph.D., Dr. Robert J. Sterling, Prof. Sophia Rostova • Harvard Center for Astrophysics & NASA JPL
Through re-analysis of Cassini Cosmic Dust Analyzer (CDA) high-rate spectra and laboratory cryo-vacuum simulations, we report the quantification of inorganic phosphorus (orthophosphate ions) at millimolar concentrations in the alkaline subsurface ocean of Saturn's moon Enceladus. We demonstrate that serpentinization and carbonated hydrothermal seafloor leaching dissolve phosphorus at levels 100 to 1,000 times higher than Earth's oceans, fulfilling the energetic and structural requirements for self-replicating ribose-phosphate polymers.
Interferometric Signatures of Higher-Order Photon Subrings in Polarized Supermassive Black Hole Accretion
Prof. Vikram Malhotra, Dr. Katherine Price, Event Horizon Analysis Collaboration • Harvard Center for Astrophysics & EHT
General relativity dictates that strong gravitational lensing around a Kerr black hole produces an infinite nested sequence of concentric photon subrings (n = 1, 2, 3...) indexed by the number of half-orbits photons execute before reaching the observer. In this paper, we compute the visibility amplitudes of the n=1 and n=2 subrings for Sagittarius A* and M87* at 345 GHz and space-VLBI frequencies, demonstrating that subring polarimetric tracking provides a pristine test of the Kerr metric independent of turbulent accretion disk astrophysics.