Tootfinder

The Communiqués Podcasts
The cases are the accounts from completed medico-legal death investigations of the Coroners Courts, and our team of senior medical and nursing practitioners present this information to meet the needs of clinicians...
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Space Astrometry with Gaia: Advances in Understanding our Galaxy
Michael Perryman
https://arxiv.org/abs/2509.10883 https://arxiv.org/pdf/2509.10883

Space Astrometry with Gaia: Advances in Understanding our Galaxy
Gaia is a satellite mission of the European Space Agency which is creating a catalogue of extremely accurate positions, distances and space motions of two billion stars in our Galaxy, along with more than one hundred thousand solar system asteroids, and several million distant quasars, all on the same extragalactic reference system. Complementary information on each object's multi-epoch photometry and spectra provides a vast and unprecedented data base of (model-dependent) fundamental physical …

YOLO-CIANNA: Galaxy detection with deep learning in radio data: II. Winning the SKA SDC2 using a generalized 3D-YOLO network
D. Cornu, B. Semelin, P. Salom\'e, X. Lu, S. Aicardi, J. Freundlich, F. Mertens, A. Marchal, G. Sainton, F. Combes, C. Tasse
https://arxiv.org/abs/2509.12082

YOLO-CIANNA: Galaxy detection with deep learning in radio data: II. Winning the SKA SDC2 using a generalized 3D-YOLO network
As the scientific exploitation of the Square Kilometre Array (SKA) approaches, there is a need for new advanced data analysis and visualization tools capable of processing large high-dimensional datasets. In this study, we aim to generalize the YOLO-CIANNA deep learning source detection and characterization method for 3D hyperspectral HI emission cubes. We present the adaptations we made to the regression-based detection formalism and the construction of an end-to-end 3D convolutional neural ne…

Testing $n_s=1$ in light of the latest ACT and SPT data
Ze-Yu Peng, Jun-Qian Jiang, Hao Wang, Yun-Song Piao
https://arxiv.org/abs/2509.11902 https://arxiv.…

Testing $n_s=1$ in light of the latest ACT and SPT data
It is commonly recognized that the primordial scalar spectral index $n_s$ is approximately $0.96-0.975$, depending on the dataset. However, this view is being completely altered by the early dark energy (EDE) resolutions of the Hubble tension, known as the most prominent tension the standard $Λ$CDM model is suffering from. In corresponding models with pre-recombination EDE, resolving the Hubble tension (i.e., achieving $H_0\sim 73$km/s/Mpc) must be accompanied by a shift of $n_s$ towards unity…

A systematic search for orbital periods of polars with TESS. Methods, detection limits, and results
Santiago Hern\'andez-D\'iaz (Institut f\"ur Astronomie und Astrophysik, Eberhard Karls Universit\"at T\"ubingen), Beate Stelzer (Institut f\"ur Astronomie und Astrophysik, Eberhard Karls Universit\"at T\"ubingen), Axel Schwope (Leibniz Institut f\"ur Astrophysik Potsdam), Daniela Mu\~noz-Giraldo (Institut f\"ur Astronomie und Astrophysik, E…

A systematic search for orbital periods of polars with TESS. Methods, detection limits, and results
Context. Determining the orbital periods of cataclysmic variable stars (CVs) is essential for confirming candidates and for the understanding of their evolutionary state. The Transiting Exoplanet Survey Satellite (TESS) provides month-long photometric data across nearly the entire sky that can be used to search for periodic variability in such systems. Aims. This study aims to identify and confirm the orbital periods for members of a recent compilation of magnetic CVs (known as polars) using TE…

The rings of (2060) Chiron: Evidence of an evolving system
C. L. Pereira, F. Braga-Ribas, B. Sicardy, R. Leiva, M. Assafin, B. E. Morgado, J. L. Ortiz, P. Santos-Sanz, J. I. B. Camargo, G. Margoti, Y. Kilic, G. Benedetti-Rossi, R. Vieira-Martins, T. F. L. L. Pinheiro, R. Sfair, F. L. Rommel, A. R. Gomes-J\'unior, R. C. Boufleur, R. Duffard, J. Desmars, D. Souami, N. Morales, F. Arrese, K. Barkaoui, A. Burdanov, C. A. Colazo, C. A. Domingues, H. Dutra, R. C. Gargalhone, C. Jacques, …

The rings of (2060) Chiron: Evidence of an evolving system
The centaur (2060) Chiron has long been a candidate for hosting material in orbit, based on occultation and photometric and spectroscopic data. Here, we present a multichord stellar occultation observed on 2023 September 10 UT that reveals new and complex structures surrounding Chiron. High-cadence light curves show multiple secondary events that are best explained (when compared with a multishell interpretation) with a system of three confined rings located at average radii of 273, 325, and 43…

The SRG/eROSITA All-Sky Survey $J$-Band Follow-Up Observations for Selected High-Redshift Galaxy Cluster Candidates
N. Zimmermann, M. Kluge, S. Grandis, T. Schrabback, F. Balzer, E. Bulbul, J. Comparat, B. Csizi, V. Ghirardini, H. Jansen, F. Kleinebreil, A. Liu, A. Merloni, M. E. Ramos-Ceja, J. Sanders, X. Zhang, P. Aschenbrenner, F. Enescu, S. Keiler, M. M\"ark, M. Rinner, P. Schweitzer, E. Silvestre-Rosello, L. Stepman

The SRG/eROSITA All-Sky Survey $J$-Band Follow-Up Observations for Selected High-Redshift Galaxy Cluster Candidates
We select galaxy cluster candidates from the high-redshift (BEST_Z > 0.9) end of the first SRG/eROSITA All-Sky Survey (eRASS1) galaxy cluster catalogue, for which we obtain moderately deep J-band imaging data with the OMEGA2000 camera at the 3.5m telescope of the Calar Alto Observatory. We include J-band data of four additional targets obtained with the three-channel camera at the 2m Fraunhofer telescope at the Wendelstein Observatory. We complement the new J-band photometric catalogue with for…

Deep Learning in Astrophysics
Yuan-Sen Ting
https://arxiv.org/abs/2510.10713 https://arxiv.org/pdf/2510.10713

Deep Learning in Astrophysics
Deep learning has generated diverse perspectives in astronomy, with ongoing discussions between proponents and skeptics motivating this review. We examine how neural networks complement classical statistics, extending our data analytical toolkit for modern surveys. Astronomy offers unique opportunities through encoding physical symmetries, conservation laws, and differential equations directly into architectures, creating models that generalize beyond training data. Yet challenges persist as un…

Central-star extinctions towards planetary nebulae
Alexander Csukai, Albert A. Zijlstra, Iain McDonald, Orsola De Marco
https://arxiv.org/abs/2509.10621 https://

Central-star extinctions towards planetary nebulae
Planetary nebulae trace the hottest and most luminous phase of evolution of solar-type stars. We use these hot, bright stars to investigate extinctions towards a complete sample of 262 confirmed PNe with large angular diameters, which have the most reliable photometry and hottest central stars. For 162 of these PNe, we identify central stars, produce spectral energy distributions from survey data using PySSED, then fit reddened model spectra to the observed photometry to obtain extinctions accu…

Analytic Model for Scattered Ly$\boldsymbol{\alpha}$ Emission in the Post-reionization Intergalactic Medium
Hyunbae Park, Hyunmi Song, Chris Byrohl, Aaron Smith, Yajima Hidenobu, Zarija Luki\'c
https://arxiv.org/abs/2509.11268

Analytic Model for Scattered Ly$\boldsymbolα$ Emission in the Post-reionization Intergalactic Medium
Ly$α$ intensity mapping is emerging as a new probe of faint galaxies consisting the cosmic web that elude traditional surveys. However, the resonant nature of Ly$α$ radiative transfer complicates the interpretation of observed data. In this study, we develop a fast and accurate analytic prescription for computing the Ly$α$ intensity field on Mpc scales in the post-reionization Universe. Motivated by insights from Monte Carlo radiative transfer (MCRT) experiments, we exploit the fact that in …