Tootfinder

Imprints of gravitational-wave polarizations on projected tidal tensor in three dimensions
Yusuke Mikura, Teppei Okumura, Misao Sasaki
https://arxiv.org/abs/2507.23302 https://

Imprints of gravitational-wave polarizations on projected tidal tensor in three dimensions
Gravitational waves (GWs) distort galaxy shapes through the tidal effect, offering a novel avenue to probe the nature of gravity. In this paper, we investigate how extra GW polarizations beyond those predicted by general relativity imprint observable signatures on galaxy shapes. Since galaxy shapes are measured as two-dimensional images projected onto the celestial sphere, we present three-dimensional statistical quantities of the projected tidal tensor sourced by the tensor perturbation. We sh…

Dynamical tide modified Roche limit in eccentric, asynchronous binaries
Hang Yu, Shu Yan Lau, Ethan Mckeever, Phil Arras, Nevin N. Weinberg
https://arxiv.org/abs/2508.20183 http…

Dynamical tide modified Roche limit in eccentric, asynchronous binaries
The Roche limit, or the threshold separation within which a celestial object (the donor) M cannot remain in a stable configuration due to a companion's tidal field, has been well established when M is in hydrostatic equilibrium and has synchronous rotation in a circular orbit. However, limited analyses exist considering corrections to the Roche limit due to hydrodynamical effects. We fill in the gap by providing a general theoretical framework involving nonlinear hydrodynamics. We consider both…

Validate the bright Gaia celestial reference frame with new VLBI astrometry of radio stars
Jingdong Zhang, Bo Zhang, Shuangjing Xu, Xiaofeng Mai
https://arxiv.org/abs/2506.18758

Validate the bright Gaia celestial reference frame with new VLBI astrometry of radio stars
There exist inconsistencies between the bright and faint Gaia Celestial Reference Frame 3 (Gaia-CRF3), which manifests as a systematic rotation and needs to be independently estimated then corrected in future data releases. We collected 64 radio stars with VLBI astrometry, of which 16 have new VLBI observations with reference epochs close to Gaia. We estimated the orientation and spin biases of the bright Gaia-CRF3 by comparing VLBI radio star astrometry with their Gaia DR3 counterparts. We als…

Stability and bifurcations of resonances in ring's dynamics
Alessandra Celletti, Irene De Blasi, Sara Di Ruzza
https://arxiv.org/abs/2507.15745 https:/…

Stability and bifurcations of resonances in ring's dynamics
We use perturbation theory and bifurcation theory to analyze the dynamical behavior of resonances, associated to a model describing a particle moving within a ring around a celestial object. The central body is modeled as a homogeneous triaxial ellipsoid, rotating about its shortest physical axis at a constant angular velocity. It is assumed that the massless ring particle moves within the equatorial plane of the ellipsoid. The dynamics of the particle is studied using epicyclic variables, that…

Low Speed Oblique Impact Behavior On Granular Media Across Gravitational Conditions; The role of cohesion
Seungju Yeo, Rachel Glade, Alice Quillen, Hesam Askari
https://arxiv.org/abs/2507.14645

Low Speed Oblique Impact Behavior On Granular Media Across Gravitational Conditions; The role of cohesion
Analyses of impact provide rich insights from the evolution of granular bodies to their structural properties of the surface and subsurface layers of celestial bodies. Although chemical cohesive bonding has been observed in asteroid samples, and low-speed impact has been a subject of many studies, our understanding of the role of cohesion in these dynamics is limited, especially at small gravities such as those observed on asteroid surfaces. In this work, we use numerical discrete element metho…

Relativistic compact stars coupled with dark energy in Heintzmann spacetime
Susmita Sarkar, Nayan Sarkar
https://arxiv.org/abs/2508.10930 https://arxiv.org…

Relativistic compact stars coupled with dark energy in Heintzmann spacetime
The literature suggests that dark energy is responsible for the accelerating expansion of the universe due to its negative pressure, therefore, dark energy can be used as a possible option to prevent the gravitational collapse of compact objects into singularities. In this regard, there is a great possibility that dark energy can interact with the compact stellar matter configuration [Phys. Rev. D 103, 084042 (2021)]. In this article, we introduce a physically viable model for celestial compact…

The Nineteenth Data Release of the Sloan Digital Sky Survey
SDSS Collaboration, Gautham Adamane Pallathadka, Mojgan Aghakhanloo, James Aird, Andr\'es Almeida, Singh Amrita, Friedrich Anders, Scott F. Anderson, Stefan Arseneau, Consuelo Gonz\'alez Avila, Shir Aviram, Catarina Aydar, Carles Badenes, Jorge K. Barrera-Ballesteros, Franz E. Bauer, Aida Behmard, Michelle Berg, F. Besser, Christian Moni Bidin, Dmitry Bizyaev, Guillermo Blanc, Michael R. Blanton, Jo Bovy, William Niels…

The Nineteenth Data Release of the Sloan Digital Sky Survey
Mapping the local and distant Universe is key to our understanding of it. For decades, the Sloan Digital Sky Survey (SDSS) has made a concerted effort to map millions of celestial objects to constrain the physical processes that govern our Universe. The most recent and fifth generation of SDSS (SDSS-V) is organized into three scientific ``mappers". Milky Way Mapper (MWM) that aims to chart the various components of the Milky Way and constrain its formation and assembly, Black Hole Mapper (BHM),…