Tootfinder

JWST/NIRCam Detection of the Fomalhaut C Debris Disk in Scattered Light
Kellen Lawson, Joshua E. Schlieder, Jarron M. Leisenring, Ell Bogat, Charles A. Beichman, Geoffrey Bryden, Andr\'as G\'asp\'ar, Tyler D. Groff, Michael W. McElwain, Michael R. Meyer, Thomas Barclay, Per Calissendorff, Matthew De Furio, Yiting Li, Marcia J. Rieke, Marie Ygouf, Thomas P. Greene, Julien H. Girard, Mario Gennaro, Jens Kammerer, Armin Rest, Thomas L. Roellig, Ben Sunnquist

JWST/NIRCam Detection of the Fomalhaut C Debris Disk in Scattered Light
Observations of debris disks offer important insights into the formation and evolution of planetary systems. Though M dwarfs make up approximately 80% of nearby stars, very few M-dwarf debris disks have been studied in detail -- making it unclear how or if the information gleaned from studying debris disks around more massive stars extends to the more abundant M dwarf systems. We report the first scattered-light detection of the debris disk around the M4 star Fomalhaut C using JWST's Near Infra…

Star-Image Centering with Deep Learning II: HST/WFPC2 Full Field of View
Dana I. Casetti-Dinescu, Roberto Baena-Galle, Terrence M. Girard, Alejandro Cervantes-Rovira, Sebastian Todeasa
https://arxiv.org/abs/2404.16995

Star-Image Centering with Deep Learning II: HST/WFPC2 Full Field of View
We present an expanded and improved deep-learning (DL) methodology for determining centers of star images on HST/WFPC2 exposures. Previously, we demonstrated that our DL model can eliminate the pixel-phase bias otherwise present in these undersampled images; however that analysis was limited to the central portion of each detector. In the current work we introduce the inclusion of global positions to account for the PSF variation across the entire chip and instrumental magnitudes to account f…

SPHERE RefPlanets: Search for epsilon Eridani b and warm dust
C. Tschudi, H. M. Schmid, M. Nowak, H. Le Coroller, S. Hunziker, R. G. van Holstein, C. Perrot, D. Mouillet, J. -C. Augereau, A. Bazzon, J. L. Beuzit, A. Boccaletti, M. J. Bonse, G. Chauvin, S. Desidera, K. Dohlen, C. Dominik, N. Engler, M. Feldt, J. H. Girard, R. Gratton, Th. Henning, M. Kasper, P. Kervella, A. -M. Lagrange, M. Langlois, P. Martinez, F. M\'enard, M. R. Meyer, J. Milli, J. Pragt, P. Puget, S. P. Quanz, R…

SPHERE RefPlanets: Search for epsilon Eridani b and warm dust
We carried out very deep VLT/SPHERE imaging polarimetry of the nearby system Eps Eri based on 38.5 hours of integration time with a 600 - 900 nm broadband filter to search for polarized scattered light from a planet or from circumstellar dust using AO, coronagraphy, high precision differential polarimetry, and angular differential imaging. We have improved several data reduction and post-processing techniques and also developed new ones to further increase the sensitivity of SPHERE/ZIMPOL. The …

«Tandis que le Plan québécois des infrastructures (PQI) bonifie de 10% les sommes allouées au réseau routier pour la période 2024-2034, les investissements en infrastructure de transport collectif ne sont augmentés que de 0,29%.» Le message de la CAQ est clair: achetez vous un char. 😟
https:/…

Budget du Québec 2024: un prélude à l’austérité
Eric Girard déposait aujourd’hui son 6e

This https://arxiv.org/abs/2312.06542 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

On inverse Goodstein sequences
In the late 1980s, Abrusci, Girard and van de Wiele defined a variant of Goodstein sequences: the so-called inverse Goodstein sequence. In their work, they show that it terminates precisely at the Bachmann-Howard ordinal. This reveals that a proof of this fact requires substantial consistency strength. Moreover, the authors could show that sequences of this kind terminate even if the hereditary base change at the heart of their construction is replaced by a generalization using arbitrary dilato…

Memoryless concretization relation
Julien Calbert, S\'ebastien Mattenet, Antoine Girard, Rapha\"el M. Jungers
https://arxiv.org/abs/2403.09556 htt…

Memoryless concretization relation
We introduce the concept of memoryless concretization relation (MCR) to describe abstraction within the context of controller synthesis. This relation is a specific instance of alternating simulation relation (ASR), where it is possible to simplify the controller architecture. In the case of ASR, the concretized controller needs to simulate the concurrent evolution of two systems, the original and abstract systems, while for MCR, the designed controllers only need knowledge of the current concr…

Shrinkage for Extreme Partial Least-Squares
Julyan Arbel, St\'ephane Girard, Hadrien Lorenzo
https://arxiv.org/abs/2403.09503 https://

Shrinkage for Extreme Partial Least-Squares
This work focuses on dimension-reduction techniques for modelling conditional extreme values. Specifically, we investigate the idea that extreme values of a response variable can be explained by nonlinear functions derived from linear projections of an input random vector. In this context, the estimation of projection directions is examined, as approached by the Extreme Partial Least Squares (EPLS) method--an adaptation of the original Partial Least Squares (PLS) method tailored to the extreme-…

Pour l'Institut d'information et de recherches socioéconomiques (IRIS), le budget du Québec présente un portrait artificiellement assombri des finances publiques. Le but: nous préparer Š des coupures dans les services publics comme le firent les libéraux avant eux.
https://

Budget du Québec 2024: un prélude à l’austérité
Eric Girard déposait aujourd’hui son 6e

3D Growth and Remodeling Theory Supports the Hypothesis of Staphyloma Formation from Local Scleral Weakening under Normal Intraocular Pressure
Fabian A. Braeu, St\'ephane Avril, Micha\"el J. A. Girard
https://arxiv.org/abs/2404.03330

3D Growth and Remodeling Theory Supports the Hypothesis of Staphyloma Formation from Local Scleral Weakening under Normal Intraocular Pressure
$\bf{Purpose}$: To assess whether Growth & Remodeling (G&R) theory could explain staphyloma formation from a local scleral weakening. $\bf{Methods}$: A finite element model of a healthy eye was reconstructed, including the following connective tissues: the lamina cribrosa, the peripapillary sclera, and the peripheral sclera. The scleral shell was modelled as a constrained mixture, consisting of an isotropic ground matrix and two collagen fiber families (circumferential and meridional). The ho…