Journees de l'ATPEM 2025

1 oct. 2025, 09:00 → 3 oct. 2025, 17:00 Europe/Paris

Amphithéatre IAP ou salle Charpak LPNHE (IAP/Paris ou Jussieu)

The Action Thématique Phénomènes Extrêmes et Multi-messagers (ATPEM, formerly PNHE) is an INSU thematic action since 2011, supported by IN2P3, INP, CNES, and CEA/IRFU.

The ATPEM days will take place from October 1 to 3, 2025 either in the IAP amphitheater or the LPNHE Charpak room in Jussieu. The event will provide an opportunity to make an overview of the current state of extreme and multi-messenger phenomena in France.

The deadline for submission of contributions is: June 1
The final program will be distributed on June 15.

Deadline for registration (and for the participation to the apéritif dînatoire): July 1

mer. 1 octobre

Welcome, Organisation des journées: P.O. Petrucci, D. Maurin

Processus physiques en jeu dans l’environnement des objets compacts (NS & PWNe & Magnetars, systèmes binaires, AGN, BH): Session 1

1 HPC Results of black hole environment - Benjamin Crinquand (IRAP)

2 Spectro-polarimetric modelling of XrB observations in the JED-SAD/MONK framework: Rafan Muhammad (IPAG)

3 Pulsar wind nebulae in wind-blown bubbles: Lioni-Moana Bourguinat (GSSI)

10:00 Coffee Break

Origine, production et transport des particules de HE (photons, neutrinos et RC): Session 1

4 Particle acceleration in extreme environment: Martin Lemoine (APC)

5 Facilitating multi-messenger modelling using Gammapy: Lea Heckmann (APC)

6 In-ice radio signatures of cosmic-ray air showers for identification and background rejection: Simon Chiche (IIHE)

Conclusions of the CNES propsectives: Philippe Laudet (CNES)

Conclusions of the INSU Prospectives: Benoit Famaey (OAS)

Discussion: prospectives INSU et CNES

12:30 Lunch break

Enjeux sociétaux: The Carbon Footprint of Astronomy Research: Jurgen Knödlseder (IRAP)

Origine, émissions multi-messagers et évolution temporelle des phénomènes transitoires (GRB, Supernovae, FRB,...): Session 1

7 Science with SVOM (and Einstein Probe) - Bertrand Cordier (CEA)

8 Colibri: Where are we now? first results and opening up to the community: Stéphane Basa (LAM)

9 Internal hydrodynamical shocks as a mechanism for GRB prompt emission: Arthur Charlet (ARCO)

10 Formation Channels of Gravitational-Wave Sources: Insights from Isolated Binary Evolution and Beyond: Aleksandra Olejak (MPIA)

11 A new scenario for short GRB precursor flares: tidal resonances of gravito-inertial modes in binary neutron stars: Alexis Reboul-Salze (AEI)

12 Unfolding the high-redshift Universe with GRBs: Andrea Saccardi (AIM/CEA)

16:10 Break

Recherche de nouvelle physique dans les données astrophysiques

13 Multi-wavelengths analyses of the millisecond pulsar PSR J0437-4715 to constrain dense matter physics: Pierre Stammler (IRAP)

14 Using Millisecond Pulsars to constrain dense matter with NICER: Lucien Mauviard (IRAP)

15 Spacetime imprints in black hole light curve autocorrelations: Irene Urso (LIRA)

Les moyens d'observation pour les thématiques PEM

16 PTA: what's new? Gilles Theureau (LPC2E)

17 Recent highlights from LHAASO: Dmitri Semikoz (APC)

18 LSST and brokers: where are we now? Emille Ishida (LPCA)

19 Steps toward the fifth Fermi-LAT source catalog: Jean Ballet (AIM/CEA)

20 Towards highest and lowest energies for the High Energy Stereoscopic System (H.E.S.S.) in Namibia: Wassim Si Said (LLR)

19:00 Apéritif dinatoire (lieu à préciser)

jeu. 2 octobre

Les moyens d'observation pour les thématiques PEM

21 More than 20 years of observations by the HESS observatory and the future with CTA: Mathieu de Naurois (LLR)

22 Recent results from XRISM: Anne Decourchelle (CEA)

23 Early UV Follow-Up of Gravitational Wave Events with ULTRASAT: Weizmann Kiendrebeogo (CEA/IRFU)

Enjeux sociétaux: Association "vient voir mon taf" : Virginie Salmen

10:35 Break

Processus physiques en jeu dans l’environnement des objets compacts (NS & PWNe & Magnetars, systèmes binaires, AGN, BH)

24 Challenges to Line-Driven Wind Launching in AGN from Full Hydro-Radiation-Ionization Simulations: Nicolas Scepi (IPAG)

25 Bubbles of ionized gas around Ultraluminous X-ray sources: Anastasia Kilina (IRAP)

Discussion: Discussion avec les tutelles notamment articulation INSU-IN2P3-INP-CEA

12:30 Lunch break

Origine, émissions multi-messagers et évolution temporelle des phénomènes transitoires (GRB, Supernovae, FRB,...): Session 2

26 Binary supermassive black holes: observations and constraints: Marta Volonteri (IAP)

27 ACME: where are we now? Antoine Kouchner (APC)

28 The electromagnetic hunt for binary black holes: numerical, analytical & observational effort: Raphael Mignon-Risse (Universidad de Valladolid )

29 Nuclear parameter inference with future observations of neutron stars: Lami Suleiman (Deutsches Elektronen-Synchrotron)

Enjeux sociétaux: Parity, gender and social bias - Thibaut Paumard (LIRA)

Flash talks

30 Astronomie multi-messager : étude de signaux transitoires extrêmes en rayons gamma et neutrinos: P. Pichard (APC)

31 Feedback in galaxies: the role of cosmic rays: Diallo (IAP)

32 Particle acceleration in Ultra Fast Outflows: Le Nagat Neher (LUX)

33 The environment of TeV halo progenitors: Bourguinat (GSSI)

34 Neutron star simulations as sources of gravitational waves: Novak (OAS)

35 Precision cross-sections for advancing cosmic-ray physics and other applications: a comprehensive programme for the next decade: Maurin (LPSC)

36 Understanding GRB progenitors from their environment: Palmerio

16:00 Break

Processus physiques en jeu dans l’environnement des objets compacts (NS & PWNe & Magnetars, systèmes binaires, AGN, BH)

37 Kinetic Simulations of Flaring Activity in a Black Hole Magnetosphere: Enzo Figueiredo (IPAG)

38 The Rhythms of Chaos: Latest news about Quasi-Periodic Eruptions : Erwan Quintin (ESA)

Recherche de nouvelle physique dans les données astrophysiques: Session 1

39 Origine of the Dark matter: where are we now ? Marco Cirelli (LPTHE)

40 Résultats O4: etat des lieux et instrumentation future (Einstein telescope/Virgo nEXT) - Viola Sordini (IP2I)

41 InterGalactic Magnetic Fields and Gamma-Ray Bursts with CTAO: Ténéman Keita (CEA/IRFU)

Les moyens d'observation pour les thématiques PEM

42 KM3NeT/IceCube results - Valentin Decoene (Subatech)

43 CTA-France : What’s new ? - Fabio Acero (AIM), Stefan Fegan (LLR), Pierre Cristofari (LUX)

ven. 3 octobre

Les moyens d'observation pour les thématiques PEM

44 NewAthena status report : Didier Barret (IRAP)

45 Review of the four years of IXPE operation: Frédéric Marin (OAS)

46 SKA-France : What’s new ? Chiara Ferrari (OCA)

47 GRAND: état des lieux: Claire Guépin (LUPM)

48 Search for cosmic rays in GRANDProto300: Jolan LAVOISIER (IAP)

10:35 Coffee Break

Processus physiques en jeu dans l’environnement des objets compacts (NS & PWNe & Magnetars, systèmes binaires, AGN, BH)

49 Self-consistent simulations of the radiative transfer in gamma-rays in neutron star magnetospheres: Théo Francez (LUX)

50 Probing Multi-TeV Emission in Pulsars: Perspectives from Fermi-LAT 3PC Phase-Resolved Spectral Analysis: Maxime Regeard (APC)

51 Tayler-Spruit dynamo to form magnetars: impact of rotation: Paul Barrere (Univ. Genève)

52 Linking protoneutron star Tayler-Spruit dynamos to low-field magnetars: Raphael Raynaud (UPCité)

Enjeux sociétaux: Astronomie participative

53 Participative Astronomy: Damien Turpin (CEA)

54 The RAPAS network: William Thuillot (IMCCE)

Discussion: Re-organisation des SNO. Quid d'un SNO alerte?