RAS_WEB

A Novel View on the Inner Crusts of Neo-Neutron Stars: exotic light nuclei, diffusional and thermodynamical stability Mikhail V. Beznogov, Adriana R. Raduta arXiv:2504.12887v1 Announce Type: cross Abstract: Based on an extended nuclear statistical equilibrium model, we investigate the properties of non-accreted crusts of young and warm neo-neutron stars, i.e., of finite-temperature inhomogeneous dense matter in beta equilibrium. We present two novel results and one known, but frequently ignored property of such matter. The first new feature is the appearance, in the deep inner crust, of an extensive and almost pure $^{14}$He layer that extends up to the density of the transition to homogeneous matter.Read More →

Discovery and Dynamics of the Nontransiting Planet Kepler-139f Caleb Lammers, Joshua N. Winn arXiv:2504.13160v1 Announce Type: new Abstract: Among the ways that an outer giant planet can alter the architecture of an inner planetary system is by tilting the orbits of the inner planets and reducing their mutual transit probabilities. Here, we report on an example of this phenomenon: we show that the Kepler-139 system contains a nontransiting planet just exterior to three transiting planets, and interior to a giant planet. This newly discovered planet, Kepler-139f, has an orbital period of $355 pm 2$ days and a mass of $36 pm 10 M_oplus$ based onRead More →

Data-driven extraction, phenomenology and modeling of eccentric harmonics in binary black hole merger waveforms Tousif Islam, Tejaswi Venumadhav, Ajit Kumar Mehta, Isha Anantpurkar, Digvijay Wadekar, Javier Roulet, Jonathan Mushkin, Barak Zackay, Matias Zaldarriaga arXiv:2504.12469v1 Announce Type: cross Abstract: Newtonian and post-Newtonian (PN) calculations suggest that each spherical harmonic mode of the gravitational waveforms (radiation) emitted by eccentric binaries can be further decomposed into several eccentricity-induced modes (indexed by $j=1$ to $j=infty$), referred to as eccentric harmonics. These harmonics exhibit monotonically time-varying amplitudes and instantaneous frequencies, unlike the full eccentric spherical harmonic modes. However, computing or extracting these harmonics are not straightforward in current numerical relativityRead More →

Unveiling the trends between dust attenuation and galaxy properties at $z sim 2$-12 with JWST V. Markov, S. Gallerani, A. Pallottini, M. Bradac, S. Carniani, R. Tripodi, G. Noirot, F. Di Mascia, E. Parlanti, N. Martis arXiv:2504.12378v1 Announce Type: new Abstract: A variety of dust attenuation/extinction curves have been observed in high-redshift galaxies, with mixed results regarding their correlations with global galaxy properties. These variations are likely driven by factors such as intrinsic dust properties, total dust content, and the dust-star geometry. In this work, we explore how the shape of dust attenuation curves-quantified by the UV-optical slope (S) and UV bump strength (B)-correlates withRead More →

Freezing of the renormalized one-loop primordial scalar power spectrum Matteo Braglia, Lucas Pinol arXiv:2504.13136v1 Announce Type: new Abstract: By consistently using the effective field theory of inflationary fluctuations in the decoupling limit, we explicitly prove that the renormalized one-loop power spectrum of the primordial curvature perturbation freezes exactly on scales larger than its sound horizon.arXiv:2504.13136v1 Announce Type: new Abstract: By consistently using the effective field theory of inflationary fluctuations in the decoupling limit, we explicitly prove that the renormalized one-loop power spectrum of the primordial curvature perturbation freezes exactly on scales larger than its sound horizon.Read More →

Astrometric Measurements and Analysis of Double Star System BRT 376 Xinyue Wang arXiv:2502.11648v3 Announce Type: replace Abstract: Using new telescope images and archival data, we investigated the positions and motions of the stars in double star system 06160-0745 BRT 376. We found that the two stars share nearly identical parallaxes and exhibit a low relative proper motion, suggesting they move together through space. Furthermore, their combined 3D velocity is less than the calculated escape velocity, indicating they are gravitationally bound rather than just physically near each other. These findings point to 06160-0745 BRT 376 being a true binary system. Future observations will help refine ourRead More →

The Non-Relativistic Effective Field Theory Of Dark Matter-Electron Interactions Gordan Krnjaic, Duncan Rocha, Tanner Trickle arXiv:2407.14598v2 Announce Type: replace-cross Abstract: Electronic excitations in atomic, molecular, and crystal targets are at the forefront of the ongoing search for light, sub-GeV dark matter (DM). In many light DM-electron interactions the energy and momentum deposited is much smaller than the electron mass, motivating a non-relativistic (NR) description of the electron. Thus, for any target, light DM-electron phenomenology relies on understanding the interactions between the DM and electron in the NR limit. In this work we derive the NR effective field theory (EFT) of general DM-electron interactions from aRead More →

Robust non-minimal attractors in many-field inflation Perseas Christodoulidis, Robert Rosati, Evangelos I. Sfakianakis arXiv:2504.12406v1 Announce Type: new Abstract: Multi-field inflation can be inherently non-predictive, with the exception of models with strong attractors. In this work, we focus on models with multiple scalar fields that are non-minimally coupled to the space-time Ricci curvature scalar, motivated by the expectation of a rich particle spectrum at high energies. We show that in this family of models, the single- and multi-field predictions for CMB observables are identical, as long as there exists at least one non-minimal coupling with $xi gg 1$. We provide simple expressions for the Hubble scale,Read More →

Contemporaneous X-ray and Optical Polarization of EHSP Blazar H 1426+428 Anuvab Banerjee, Akash Garg, Divya Rawat, Svetlana Jorstad, Alan P. Marscher, Ivan Agudo, Jorge Otero-Santos, Daniel Morcuende, Juan Escudero Pedrosa, Alberto Dominguez, Ayan Bhattacharjee, Isaiah Cox, Indrani Pal, Xiurui Zhao, Andrealuna Pizzetti, Stefano Marchesi, Nuria Torres-Alba, Kouser Imam, Ross Silver, Marco Ajello arXiv:2504.12410v1 Announce Type: new Abstract: We present the first contemporaneous X-ray and optical polarimetric measurement of the extremely high synchrotron peaked (EHSP) blazar H 1426+428. The X-ray polarimetric observations were undertaken using the Imaging X-ray Polarimetry Explorer (textit{IXPE}) on 2024 May 27, and 2024 July 5. The textit{IXPE} pointings were accompanied by contemporaneousRead More →

Insights into environmental quenching at $zsim1$: an enhancement of faint, low-mass passive galaxies in clusters Harry Gully, Nina Hatch, Syeda Lammim Ahad, Yannick Bah’e, Michael Balogh, Devontae C. Baxter, Pierluigi Cerulo, M. C. Cooper, Ricardo Demarco, Ben Forrest, Umberto Rescigno, Gregory Rudnick, Benedetta Vulcani, Gillian Wilson arXiv:2504.12394v1 Announce Type: new Abstract: Understanding the processes that transform star-forming galaxies into quiescent ones is key to unraveling the role of environment in galaxy evolution. We present measurements of the luminosity functions (LFs) and stellar mass functions (SMFs) of passive red-sequence galaxies in four galaxy clusters at $0.8 arXiv:2504.12394v1 Announce Type: new Abstract: Understanding the processes that transformRead More →

Galactic warps: from cosmic noon to the current epoch Vladimir P. Reshetnikov, Ilia V. Chugunov, Alexander A. Marchuk, Aleksandr V. Mosenkov, Matvey D. Kozlov, Sergey S. Savchenko, Dmitry I. Makarov, Aleksandra V. Antipova, Anastasia M. Sypkova arXiv:2504.12403v1 Announce Type: new Abstract: Approximately half of all disc galaxies exhibit appreciable warps in both their stellar and HI discs. The typical warp amplitude is small (a few degrees), becoming noticeable only at the periphery of the galaxy disc. As a result, warps remain a relatively poorly studied phenomenon. In this study, we investigate a large sample of distant edge-on galaxies (approximately 1,000 objects) to examine the frequencyRead More →

N-body simulations of dark matter-baryon interactions Moritz S. Fischer, Klaus Dolag, Mathias Garny, Vera Gluscevic, Frederick Groth, Ethan O. Nadler arXiv:2504.12393v1 Announce Type: new Abstract: Dark matter (DM) particles can interact with particles of the Standard Model. Although there exist constraints from direct and indirect detection experiments, the dynamical evolution of astrophysical objects could provide a promising probe for these interactions. Obtaining astrophysical predictions is challenging and limited by our ability to simulate scatterings between DM and baryonic particles within N-body and hydrodynamics simulations. We develop a novel scheme that allows simulating these interacting dark matter (IDM) models and accurately accounts for their angular andRead More →

WINTER on S250206dm: A near-infrared search for an electromagnetic counterpart Danielle Frostig, Viraj R. Karambelkar, Robert D. Stein, Nathan P. Lourie, Mansi M. Kasliwal, Robert A. Simcoe, Mattia Bulla, Tomas Ahumada, Geoffrey Mo, Josiah Purdum, Jill Juneau, Andrew Malonis, Gabor Furesz arXiv:2504.12384v1 Announce Type: new Abstract: We present near-infrared follow-up observations of the International Gravitational Wave Network (IGWN) event S250206dm with the Wide-Field Infrared Transient Explorer (WINTER). WINTER is a near-infrared time-domain survey designed for electromagnetic follow-up of gravitational-wave sources localized to $leq$300 deg$^{2}$. The instrument’s wide field of view (1.2 deg$^2$), dedicated 1-m robotic telescope, and near-infrared coverage (0.9-1.7 microns) are optimized for searchingRead More →

Origin of the IRAS Vela Shell: New Insights from 3D Dust Mapping Bore Annie Gao, Catherine Zucker, Tirupati Kumara Sridharan, Cameren Swiggum, Shmuel Bialy, Theo J. O’Neill, J. E. G. Peek, Luciana Bianchi, Robert Benjamin, Lewis McCallum, Alyssa Goodman, Jo~ao Alves, Charles Lada, Gordian Edenhofer, Rowan Smith, Elizabeth Watkins, Kenneth Wood, Doni Anderson arXiv:2504.12381v1 Announce Type: new Abstract: The IRAS Vela Shell (IVS) is a structure of enhanced FIR emission located towards the Gum Nebula, a prominent region of $rm Halpha$ emission in the local Milky Way shaped by various galactic stellar feedback over the past several million years. We constrain the 3D spatial geometryRead More →