Detection of a 2.85 micrometer Feature on 5 Spinel-rich Asteroids from JWST Jonathan Gomez Barrientos, Katherine de Kleer, Bethany L. Ehlmann, Francois L. H. Tissot, Jessica Mueller arXiv:2405.12281v1 Announce Type: new Abstract: Ground-based observations of `Barbarian’ L-type asteroids at 1 to 2.5-$mu$m indicate that their near-infrared spectra are dominated by the mineral spinel, which has been attributed to a high abundance of calcium-aluminum inclusions (CAIs) — the first solids to condense out of the protoplanetary disk during the formation of the Solar System. However, the spectral properties of these asteroids from 2.5 to 5-$mu$m, a wavelength region that covers signatures of hydrated minerals, water, andRead More →

DESI Dark Energy Time Evolution is Recovered by Cosmologically Coupled Black Holes Kevin S. Croker, Gregory Tarl’e, Steve P. Ahlen, Brian G. Cartwright, Duncan Farrah, Nicolas Fernandez, Rogier A. Windhorst arXiv:2405.12282v1 Announce Type: new Abstract: Recent results from baryon acoustic oscillation measurements by the Dark Energy Spectroscopic Instrument (DESI) have found preliminary evidence that dark energy (DE) evolves with time, as parameterized by a $w_0 w_a$ equation of state. In this study, we point out that the DESI-preferred $w_0w_a$ models are recovered when a $w_0w_a$ model is fit to DE produced by baryon conversion in cosmologically coupled black holes (BHs). This recovery does not requireRead More →

Beyond the surface: hydrodynamical N-body simulations of the interacting dwarf galaxies NGC 5238 and UGC 8760 R. Pascale, F. Annibali, M. Tosi, C. Nipoti, F. Marinacci, M. Bellazzini, J. M. Cannon, L. Schisgal, E. Sacchi F. Calura arXiv:2405.12284v1 Announce Type: new Abstract: From deep imaging data obtained with the Large Binocular Telescope as part of the Smallest Scale of Hierarchy Survey (SSH), we have discovered low-surface brightness tidal features around NGC 5238 and UGC 8760, two nearby and relatively isolated dwarf galaxies with stellar masses of approximately $10^8 M_odot$ and $2times10^7 M_odot$, respectively. In this study, we present detailed hydrodynamical $N$-body simulations that explain theRead More →

Massive Star Cluster Formation II. Runaway Stars as Fossils of Sub-Cluster Mergers Brooke Polak, Mordecai-Mark Mac Low, Ralf S. Klessen, Simon Portegies Zwart, Eric P. Andersson, Sabrina M. Appel, Claude Cournoyer-Cloutier, Simon C. O. Glover, Stephen L. W. McMillan arXiv:2405.12286v1 Announce Type: new Abstract: Two main mechanisms have classically been proposed for the formation of runaway stars. The binary supernova scenario (BSS) suggests that a massive star in a binary explodes as a supernova, ejecting its companion. The dynamical ejection scenario suggests that a star is ejected through a strong dynamical encounter between multiple stars. We propose a third mechanism for the formation of runawayRead More →

Improved model of the Supernova Refsdal cluster MACS J1149.5+2223 thanks to VLT/MUSE S. Schuldt, C. Grillo, G. B. Caminha, A. Mercurio, P. Rosati, T. Morishita, M. Stiavelli, S. H. Suyu, P. Bergamini, M. Brescia, F. Calura, M. Meneghetti arXiv:2405.12287v1 Announce Type: new Abstract: We present new VLT/MUSE observations of the Hubble Frontier Field (HFF) galaxy cluster MACS J1149.5+2223, lensing the well-known supernova “Refsdal” into multiple images, which enabled the first cosmological applications with a strongly lensed supernova. Thanks to these data, targeting a northern region of the cluster and thus complementing our previous MUSE program on the cluster core, we release a new catalog containingRead More →

HST/JWST Long-Term Monitoring Working Group Final Report Saurabh W. Jha, Dana I. Casetti-Dinescu, Gary M. Bernstein, Matthew J. Hayes, Lidia M. Oskinova, Andrew B. Pace, Robert M. Quimby, Megan Reiter, Armin Rest, Adam G. Riess, David J. Sand, Daniel R. Weisz arXiv:2405.12297v1 Announce Type: new Abstract: The Astro2020 Decadal Survey recognizes time-domain astronomy as a key science area over the next decade and beyond. With over 30 years of HST data and the potential for 20 years of JWST operations, these flagship observatories offer an unparalleled prospect for a half-century of space-based observations in the time domain. To take best advantage of this opportunity, STScIRead More →

The Significance of Void Shape: Neutrino Mass from Voronoi Void-Halos? Adrian E. Bayer, Jia Liu, Christina D. Kreisch, Alice Pisani arXiv:2405.12302v1 Announce Type: new Abstract: Massive neutrinos suppress the growth of cosmic structure on nonlinear scales, motivating the use of information beyond the power spectrum to tighten constraints on the neutrino mass, for example by considering cosmic voids. It was recently proposed that constraints on neutrino mass from the halo mass function (HMF) can be improved by considering only the halos that reside within voids — the void-halo mass function (VHMF). We extend this analysis, which made spherical assumptions about the shape of voids, toRead More →

Verification of astrometrically accelerating stars from Hipparcos and Gaia: I. Methodology and application to HIP 44842 Valeri V. Makarov, Andrei Tokovinin arXiv:2405.12315v1 Announce Type: new Abstract: A large number of candidate binary stars with apparent acceleration on the sky has emerged from analysis of astrometric data collected by the Hipparcos, Tycho-2, and Gaia space missions. Although the apparent acceleration can serve as a relatively reliable indicator of binarity, it provides scarce information about the orbital and physical parameters of the components. With an emphasis on the search for stellar-mass black holes and neutron stars hidden in binary systems, we start a broader effort to characterizeRead More →

Robust 1-norm periodograms for analysis of noisy non-Gaussian time series with irregular cadences: Application to VLBI astrometry of quasars Valeri V. Makarov, S’ebastien Lambert, Phil Cigan, Christopher DiLullo, David Gordon arXiv:2405.12324v1 Announce Type: new Abstract: Astronomical time series often have non-uniform sampling in time, or irregular cadences, with long gaps separating clusters of observations. Some of these data sets are also explicitly non-Gaussian with respect to the expected model fit, or the simple mean. The standard Lomb-Scargle periodogram is based on the least squares solution for a set of test periods and, therefore, is easily corrupted by a subset of statistical outliers or an intrinsicallyRead More →

Close Binary Fractions in accreted and in-situ Halo Stars Dolev Bashi, Vasily Belokurov, Simon Hodgkin arXiv:2405.12335v1 Announce Type: new Abstract: The study of binary stars in the Galactic halo provides crucial insights into the dynamical history and formation processes of the Milky Way. In this work, we aim to investigate the binary fraction in a sample of accreted and in-situ halo stars, focusing on short-period binaries. Utilising data from Gaia DR3, we analysed the radial velocity (RV) uncertainty $sigma_{mathrm{RV}}$ distribution of a sample of main-sequence stars. We used a novel Bayesian framework to model the dependence in $sigma_{mathrm{RV}}$ of single and binary systems allowing usRead More →

Unveiling the Complex Circumgalactic Medium: A Comparative Study of Merging and Non-Interacting Galaxy Groups Antonia Fernandez-Figueroa, Glenn G. Kacprzak, Nikole M. Nielsen, Tania M. Barone, Hasti Nateghi, Sameer, Deanne B. Fisher, Bronwyn Reichardt Chu arXiv:2405.12348v1 Announce Type: new Abstract: While most galaxies live in group environments where they undergo an accelerated evolution, the characteristics of their circumgalactic medium (CGM) remain uncertain. We present an analysis of the CGM of two galaxy groups in different stages of interaction: (G1) a close pair of galaxies ($z=0.043$) separated by 87 kpc that do not show signs of interactions and (G2) four merging galaxies ($z=0.098$) separated by 10 kpc.Read More →

The influence of ionized gas kinematics on HII galaxies. The cases of Tol 1004-296 and Tol 0957-278 Henri Plana, Vitor G. Alves, Maiara S. Carvalho arXiv:2405.12361v1 Announce Type: new Abstract: Blue Compact Galaxies (BCGs), also known as HII galaxies, are dwarf, star-forming objects with relatively simple dynamics, which allows for the investigation of star formation mechanisms in a cleaner manner compared to late-type objects. In this study, we have examined various characteristics of the interstellar medium, in connection with the kinematics and dynamics of ionized gas, in Tol 1004-296 and Tol 0957-278. These two objects were observed using the SOAR Integral Field Spectrometer (SIFS) attachedRead More →

A New Asteroseismic $textit{Kepler}$ Benchmark Constrains the Onset of Weakened Magnetic Braking in Mature Sun-Like Stars Vanshree Bhalotia, Daniel Huber, Jennifer L. van Saders, Travis S. Metcalfe, Keivan G. Stassun, Timothy R. White, V’ictor Aguirre B{o}rsen-Koch, Warrick H. Ball, Sarbani Basu, Aldo M. Serenelli, Erica Sawczynec, Joyce A. Guzik, Andrew W. Howard, Howard Isaacson arXiv:2405.12362v1 Announce Type: new Abstract: Stellar spin down is a critical yet poorly understood component of stellar evolution. In particular, results from the Kepler Mission imply that mature age, solar-type stars have inefficient magnetic braking, resulting in a stalled spin down rate. However, a large number of precise asteroseismic ages areRead More →

Swift J1727.8-1613 has the Largest Resolved Continuous Jet Ever Seen in an X-ray Binary Callan M. Wood, James C. A. Miller-Jones, Arash Bahramian, Steven J. Tingay, Steve Prabu, Thomas D. Russell, Pikky Atri, Francesco Carotenuto, Diego Altamirano, Sara E. Motta, Lucas Hyland, Cormac Reynolds, Stuart Weston, Rob Fender, Elmar K"ording, Dipankar Maitra, Sera Markoff, Simone Migliari, David M. Russell, Craig L. Sarazin, Gregory R. Sivakoff, Roberto Soria, Alexandra J. Tetarenko, Valeriu Tudose arXiv:2405.12370v1 Announce Type: new Abstract: Multi-wavelength polarimetry and radio observations of Swift J1727.8-1613 at the beginning of its recent 2023 outburst suggested the presence of a bright compact jet aligned in the north-southRead More →

Widespread disruption of resonant chains during protoplanetary disk dispersal Brad M. S. Hansen, Tze-Yeung Yu, Yasuhiro Hasegawa arXiv:2405.12388v1 Announce Type: new Abstract: We describe the evolution of low mass planets in a dispersing protoplanetary disk around a Solar mass star. The disk model is based on the results of Yu, Hansen & Hasegawa (2023), which describes a region of the inner disk where the direction of the migration torque is outwards due to the diffusion of the stellar magnetic field into the disk and the resultant gradual increase in surface density outwards. We demonstrate that the magnetospheric rebound phase in such a disk leads toRead More →

SALTUS Probe Class Space Mission: Observatory Architecture and Mission Design Leon K. Harding, Jonathan W. Arenberg, Benjamin Donovan, Dave Oberg, Ryan Goold, Bob Chang, Christopher Walker, Dana Turse, Jim Moore, Jim C. Pearson Jr, John N. Kidd Jr, Zach Lung, Dave Lung arXiv:2405.12394v1 Announce Type: new Abstract: We describe the space observatory architecture and mission design of the SALTUS mission, a NASA Astrophysics Probe Explorer concept. SALTUS will address key far-infrared science using a 14-m diameter arXiv:2405.12394v1 Announce Type: new Abstract: We describe the space observatory architecture and mission design of the SALTUS mission, a NASA Astrophysics Probe Explorer concept. SALTUS will address key far-infraredRead More →

Searching for gravitational wave optical counterparts with the Zwicky Transient Facility: summary of O4a Tom’as Ahumada, Shreya Anand, Michael W. Coughlin, Vaidehi Gupta, Mansi M. Kasliwal, Viraj R. Karambelkar, Robert D. Stein, Gaurav Waratkar, Vishwajeet Swain, Theophile Jegou du Laz, Akash Anumarlapudi, Igor Andreoni, Mattia Bulla, Gokul P. Srinivasaragavan, Andrew Toivonen, Avery Wold, Eric C. Bellm, S. Bradley Cenko, David L. Kaplan, Jesper Sollerman, Varun Bhalerao, Daniel Perley, Anirudh Salgundi, Aswin Suresh, K-Ryan Hinds, Simeon Reusch, Jannis Necker, David O. Cook, Natalya Pletskova, Leo P. Singer, Smaranika Banerjee, Tyler Barna, Christopher M. Copperwheat, Brian Healy, R. Weizmann Kiendrebeogo, Harsh Kumar, Ravi Kumar, Marianna Pezzella, AnaRead More →

HD 110067 c has an aligned orbit J. Zak, H. M. J. Boffin, E. Sedaghati, A. Bocchieri, Q. Changeat, A. Fukui, A. Hatzes, T. Hillwig, K. Hornoch, D. Itrich, V. D. Ivanov, D. Jones, P. Kabath, Y. Kawai, L. V. Mugnai, F. Murgas, N. Narita, E. Palle, E. Pascale, P. Pravec, S. Redfield, G. Roccetti, M. Roth, J. Srba, Q. Tian, A. Tsiaras, D. Turrini, J. P. Vignes arXiv:2405.12409v1 Announce Type: new Abstract: Planetary systems in mean motion resonances hold a special place among the planetary population. They allow us to study planet formation in great detail as dissipative processes are thought to have playedRead More →

On the Origin of Fast Rotating Stars. I. Photometric calibration and results of AO-assisted BVRI+Halpha imaging of NGC330 with SAMI/SOAR Felipe Navarete (SOAR Telescope/NSF’s NOIRLab, La Serena, Chile), Pedro Ticiani dos Santos (Universidade de S~ao Paulo, Instituto de Astronomia, Geof’isica e Ci^encias Atmosf’ericas, Cidade Universit’aria S~ao Paulo-SP, Brazil), Alex Cavali’eri Carciofi (Universidade de S~ao Paulo, Instituto de Astronomia, Geof’isica e Ci^encias Atmosf’ericas, Cidade Universit’aria S~ao Paulo-SP, Brazil), Andr’e Luiz Figueiredo (Universidade de S~ao Paulo, Instituto de Astronomia, Geof’isica e Ci^encias Atmosf’ericas, Cidade Universit’aria S~ao Paulo-SP, Brazil) arXiv:2405.12429v1 Announce Type: new Abstract: H$alpha$ emission is a clear indicator of circumstellar activity in Be stars, historically employedRead More →