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Astrophysics

Research into stars, galaxies, cosmology, planets, and the physics of the universe.

CHANNEL // 04 [45]

Astrophysics

Research into stars, galaxies, cosmology, planets, and the physics of the universe.

arxiv.org
Reading the Ingredients of Planets in M-Dwarf Starlight
Source published 2026-11-04
Infrared spectra of 40 planet-hosting M dwarfs reveal stellar abundances useful for studying rocky-planet interiors and Galactic stellar populations, while exposing important modeling uncertainties.
- M dwarfs
- exoplanet host stars
- stellar abundances
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arxiv.org
A softly broken symmetry offers a route across the phantom divide
Source published 2026-11-04
A preprint proposes a modified-gravity model in which effective dark energy crosses w = −1 while fitting selected cosmological data slightly better than a common evolving-dark-energy parametrization. The result depends on model choices and awaits independent tests, especially from structure growth.
- dark energy
- modified gravity
- phantom divide
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arxiv.org
A JWST planet search reveals a galaxy masquerading as a companion
Source published 2026-11-04
A reanalysis of HIP 65426 coronagraphic images finds no additional confirmed planets, but shows how wavelength coverage and evolving calibration affect companion searches.
- HIP 65426
- JWST
- direct imaging
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