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Thibault Guillemin (LAPP)25/11/2025 09:30
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Marc Betoule (LPNHE)25/11/2025 10:10
StarDICE is a photometric calibration experiment attempting to
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establish NIST-traceable spectrophotometric standard stars for the
upcoming LSST supernova survey. Since the last LSST-France meeting,
the experiment has resumed observations after upgrades in the data
acquisition, and a thorough measurement campain of the instrument
transmission curves using a dedicated instrument called... -
Dr Sylvie Dagoret (IJCLab)25/11/2025 11:00
Accurate modeling of precipitable water vapor (PWV) variations is essential to meet Rubin Observatory’s photometric precision requirements, particularly in the Y band. Simulations with getObsAtmo and rubin_sim show that achieving photometric errors below 1, 5, and 10 mmag corresponds respectively to statistical PWV uncertainties of ΔPWVₛₜₐₜ < 0.03, 0.1, and 0.5 mm.
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PWV measurements... -
Corentin Ravoux (LPC Clermont-Ferrand CNRS/IN2P3)25/11/2025 11:20
The Auxiliary telescope (AuxTel) of the Rubin Observatory is a spectrometer that precisely characterizes the atmosphere during LSST observation. Observing standard stars and comparing the resulting spectra with out-of-atmosphere CALSPEC spectra gives the whole atmospheric transmission curve. This procedure is performed with a forward modeling software called Spectractor, which is implemented...
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Rafael Kebadian (CPPM)25/11/2025 14:00
$f\sigma_8$ is a powerful probe at low redshift to discriminate between different theories of gravity. In linear theory, this parameter is directly related to the velocity field. In this talk, I will show how the peculiar velocities of ZTF Type Ia supernovae can be used to measure $f\sigma_8$ . I apply a maximum likelihood approach together with realistic simulations based on N-body mocks. I...
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Damiano Rosselli (CPPM)25/11/2025 14:20
We present the first forecast for the measurement of the cosmic growth-rate parameter, fσ8, using peculiar velocities (PVs) derived from Type Ia supernovae (SNe Ia) in the Vera C. Rubin Observatory’s Legacy Survey of Space and Time (LSST). We produce simulations of different SNe types using a realistic LSST observing strategy, incorporating noise, photometric detection from the Difference...
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Luna Dellazzeri (Institut de Physique des 2 Infinis de Lyon)25/11/2025 14:40
Realistic transient simulations are essential to interpret the observations of surveys such as LSST.
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I will present skysurvey, a Python library developed in the cosmological team in Lyon, that simulates astrophysical transients, and in particular Type Ia supernovae, for any survey, including LSST. skysurvey aims to combine computational efficiency, ease of use, and physical realism and... -
Adam Trigui (IP2I)25/11/2025 15:00
Systematic uncertainties associated to calibration, selection function and astrophysical effects are dominating the error budget of SN Ia cosmology. Correction methods applied to account for these systematics, and especially for the complex combination of selection function and astrophysical variability, are questionable, particularly given the current H0 and Lambda tensions for which SN Ia...
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Narei Lorenzo Martinez (LAPP)25/11/2025 15:20
The Halo Mass Function (HMF) is a parametric function that allows to describe the distribution of halos masses given a cosmology and the redshift. It is thus widely used in cluster analyses to extract cosmological parameters like sigma_8 and Omega_M from the observation of clusters. Many different HMF exist in the literature with different parameterizations as a function of redshift and...
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Constantin Payerne (CEA/DPhP/Irfu)25/11/2025 15:40
Galaxy clusters are among the most powerful probes of cosmology, providing key insights into the growth of structure and the nature of dark energy. However, translating cluster observations into robust cosmological constraints remains challenging, primarily due to uncertainties in mass calibration and systematic effects. Upcoming surveys such as the Rubin Observatory’s LSST and Euclid will...
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Dr Emille Ishida (CNRS/LPC-Clermont)26/11/2025 09:00
I will give an overview of the last activities of the Fink broker, and describe the status of processing Rubin alerts.
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Gabriel Teixeira (Centro Brasileiro de Pesquisas Físicas)26/11/2025 09:20
The early light curves of supernovae provide critical insights into the properties of their progenitor systems and, in some cases, play an essential role in our understanding of the evolution of the Universe. With the advent of wide-field surveys such as the Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST), large samples of early supernova light curves will become available,...
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Alex Jacquesson (IJCLab pôle a2c og)26/11/2025 09:40
The LSST will provide an excellent opportunity to study a wide range of fast transients and to better understand the diverse physical mechanisms driving explosive astrophysical events. During the first month of my PhD, I conducted research aimed at distinguishing rapid explosive transients and performed systematic scans using the Skyportal platform and the private ZTF alert stream. These same...
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Julian Hamo (IJCLab)26/11/2025 10:00
To date, blazars constitute the largest population of objects in the extragalactic gamma-ray sky. They generate over 50% of the extragalactic diffuse gamma-ray background photon flux at energies higher than 100 MeV. They are a subclass of active galactic nuclei that exhibit a relativistic jet pointing towards Earth at an angle of less than 10°. Their electromagnetic emission spans from radio...
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Dr Miguel Llamas Lanza (IRAP)26/11/2025 10:20
Tidal disruption events (TDEs) refer to the destruction of a star by the tidal forces around a black hole, leading to outbursts that can last for months. Although modern optical time-domain surveys have substantially expanded the known TDE sample, these events remain rare. Further increasing the sample is crucial for advancing our understanding of the underlying physics, making TDE discovery a...
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Matthieu Pelissier (LPSC/UGA)
Dark matter subhalos with masses from 10⁶ to 10⁹ solar masses are mostly invisible, but could impact the structure of stellar streams observed by LSST. Presentation on how LSST systematics could impact density fluctuations measurements in stellar streams, used to set dark matter constrains.
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