Astronomical observations reveal a major deficiency in our understanding of physics—the
detectable mass is insufficient to explain the observed motions in a huge variety of systems …

Access to microarcsecond astrometry is now routine in the radio, infrared (IR), and optical
domains. In particular, the publication of the second data release (Gaia DR2) from the Gaia …

Astrometry, the precise measurement of star motions, offers an alternative avenue to
investigate low-frequency gravitational waves through the spatial deflection of photons …

Axion-like particles (ALPs) are leading candidates to explain the dark matter in the universe.
Their production via the misalignment mechanism has been extensively studied for cosine …

Astrometric surveys offer us a method for searching for elusive cosmic signatures, such as
ultralight dark photon dark matter and gravitational waves (GWs), by observing the temporal …

Abstract The Closeby Habitable Exoplanet Survey (CHES) constitutes a mission intricately
designed to systematically survey approximately 100 solar-type stars located within the …

Being one of the most fundamental physical parameter of astronomical objects, mass plays
a vital role in the study of exoplanets, including their temperature structure, chemical …

Determining the mass of neutron stars is crucial for understanding their formation, evolution,
and interior structure. Currently, only a few dozen neutron stars have had their masses …

We use the kinematic data of the stars in eight dwarf spheroidal galaxies to assess whether f
(R) gravity can fit the observed profiles of the line-of-sight velocity dispersion of these …

The Gaia space telescope allows for unprecedented accuracy for astrometric measurements
of stars in the Galaxy. In this work, we explore the sensitivity of Gaia to detect primordial …