CEA/DAp SEMINAR ORGANIZATION



The Astrophysics Seminars of the DAp (Département d'Astrophysique) are held at the Orme des Merisiers campus of the CEA Saclay. The schedule is posted on this website. Unless otherwise posted, the seminar takes place at 10am on Tuesdays in room Galilée (Building 713C).

Current seminar organization team:
Frédéric GALLIANO, Pierre-Antoine FRUGIER, Camila CORREA, Fabian HERVAS PETERS.
Official CEA page where the seminars are advertised:
HTML. Seminars appearing at that link are confirmed.
Practical information for speakers:
HTML / PDF.
Notes for organizers:
HTML / PDF.
Synchronised DAp seminar calendar:
ICS. Use this link in your favorite agenda tool.
Video archive of the DAp seminars (intranet):


PAST SEMINAR & NEXT ONES (FROM November 22, 2024)


Tuesday

November 19

10:00
Postdoc seminar / séminaire postdoc
Jose Ignacio "Nacho" ANEZ LOPEZ
(LFEMI)

Signatures of magnetic braking in Class 0 protostars ? Exploring the gas kinematics in magnetized models of low-mass star formation


[click here for abstract]
The role of magnetic braking in regulating gravitational collapse and circumstellar disk during the main accretion phase, is an open question. While only indirect evidence was found from observational work, such as compact disk sizes and the launching of high-velocity collimated jets, we aim at more direct tests of the magnetic braking in observations. The study of polarized dust emission as a tracer of the magnetic field and molecular line emission as a tracer of gas kinematics in young protostars can provide valuable information for understanding how the presence of the magnetic field affects the accretion process.

In the present work, we have used both non-ideal MHD models and synthetic observations from the radiative transfer of protostellar formation to put constraints on the magnetically-regulated disk formation scenario. We use our model synthetic observations to identify possible direct signatures of the magnetic braking from the maps of the molecular gas emission. By comparing the specific angular momentum of two similar models that differ in magnetic flux, we see that the more magnetized model shows a higher angular momentum redistribution above 1000 au. In addition, we have tested the methods typically used to infer the specific angular momentum from an observational point of view. We have found possible observational evidence of magnetic braking in the kinematics of the C18O(2-1) molecule, such as a flattening of the radial profile of specific angular momentum for radii smaller than 1000 au for the more magnetized model similar to the characteristics found in observational work. On the other hand, in this study we show that the maximum velocity computed in the equatorial plane, which is traditionally used as an approximation of the rotational velocity, may overestimate the rotational velocity, probably due to contamination from radial motions.

Local contact: Thierry FOGLIZZO; organization: Frédéric GALLIANO

Tuesday

November 26

Special event / Événement spécial
Visite de l'HCERES (AIM) / no seminar
Tuesday

December 3

10:00
Stefano CAMERA
(University of Turin)

Synergic cosmology across the spectrum


[click here for abstract]
In my talk, I shall review the main research projects I'm involved in, which all revolve around the added value of cross-correlations between various cosmological observables, as well as among cosmological and astrophysical observables, to shed new light onto pressing open questions in cosmology. In particular, I shall touch upon the possibility of detecting relativistic effects on cosmological scales - which will allow us to deepen our understanding of dark energy and modified gravity -, novel approaches to probe primordial non-Gaussianity, and the use of cosmological data to filter out astrophysical processes in studies of indirect detection of particle dark matter signatures. All this in the view of the new generation of cosmological experiments across the electromagnetic spectrum, like the SKA Observatory in the radio band, or the Euclid satellite at optical/near-infrared wavelengths.

Local contact: Martin KILBINGER; organization: Fabian HERVAS-PETERS
Tuesday

December 10

Special event / Événement spécial
Visite de l'HCERES (Irfu) / no seminar
Tuesday

December 17

10:00
Jean BALLET, Anne DECOURCHELLE, Gabriel PRATT et al.
(LEPCHE)

Les 25 ans d'XMM


[click here for abstract]
Lancé le 10 décembre 1999, le satellite XMM-Newton d'observation en rayons X fêtera ses 25 ans d'opération et d'exploitation scientifique, et une moisson de résultats scientifiques dans de nombreux domaines. Nous vous invitons mardi 17 septembre 2024 à un séminaire d'anniversaire de la mission XMM-Newton, pierre angulaire du programme Horizon 2000 de l'Agence Spatiale Européenne. Nous retracerons à plusieurs voix l'implication du DAp-AIM dans la réalisation et l'exploitation des données de XMM-Newton, et vous présenterons une sélection de résultats scientifiques marquants.

Local contact: Anne DECOURCHELLE; organization: Pierre-Antoine FRUGIER


2025


Tuesday

January 7

10:00
Postdoc seminar / séminaire postdoc
Emma AYÇOBERRY
(LCS)

Thermal Sunyaev-Zel’dovich power spectrum: analytical model and measurement in simulations



Local contact: Thierry FOGLIZZO; organization: Frédéric GALLIANO
Tuesday

January 14

10:00
Postdoc seminar / séminaire postdoc
Maximilien FRANCO
(LCEG)

Characterization of the brightest galaxies during the Epoch of Reionization in COSMOS-Web



Local contact: Thierry FOGLIZZO; organization: Frédéric GALLIANO
Tuesday

January 21

10:00
Recent hiree seminar / séminaire arrivant récent
Ugo LEBREUILLY
(LMPA)

Gas and dust evolution during protoplanetary disk formation



Local contact: Ugo LEBREUILLY; organization: Frédéric GALLIANO
Tuesday

January 28

10:00
Samuel LANDER
(University of East Anglia)

The first five minutes in the life of a neutron star's magnetic field



Local contact: Thierry FOGLIZZO; organization: Frédéric GALLIANO
Tuesday

February 4

10:00
Postdoc seminar / séminaire postdoc
Arthur LE SAUX
(LDE3)

Unveiling stellar internal dynamics with hydrodynamical simulations



Local contact: Thierry FOGLIZZO; organization: Frédéric GALLIANO
Tuesday

February 11

10:00
Postdoc seminar / séminaire postdoc
Roberta GIUFFRIDA
(LEPCHE)

[TBA]



Local contact: Thierry FOGLIZZO; organization: Frédéric GALLIANO
Tuesday

February 18

Vacations / Vacances
Vacances d'hiver
Tuesday

February 25

Vacations / Vacances
Vacances d'hiver
Tuesday

March 4

10:00
Postdoc seminar / séminaire postdoc
Joey MOMBARG
(LDE3)

The next step in stellar evolution: towards multi-dimensional models



Local contact: Thierry FOGLIZZO; organization: Frédéric GALLIANO
Tuesday

March 11

10:00
Postdoc seminar / séminaire postdoc
Cail DALEY
(LCS)

CMB Lensing Measurements with Two Years of Data from the SPT-3G Survey



Local contact: Thierry FOGLIZZO; organization: Frédéric GALLIANO
Tuesday

March 18

10:00
[TBA]
Tuesday

March 25

10:00
[TBA]
Tuesday

April 1

10:00
Evan O'CONNOR
(Stockholm University, Sweden)

Recent Advances in Core-Collapse Theory



Local contact: Thierry FOGLIZZO; organization: Frédéric GALLIANO
Tuesday

April 8

10:00
LCS invitee
(Array)

.



Local contact: [-]; organization: [-]
Tuesday

April 15

Vacations / Vacances
Vacances de printemps
Tuesday

April 22

Vacations / Vacances
Vacances de printemps
Tuesday

April 29

10:00
[TBA]
Tuesday

May 6

10:00
[TBA]
Tuesday

May 13

10:00
[TBA]
Tuesday

May 20

10:00
Natascha FORSTER SCHREIBER
(Max-Planck-Institut für extraterrestrische Physik)

Star-Forming Galaxies at Cosmic Noon and Beyond



Local contact: Emanuele DADDI; organization: Frédéric GALLIANO
Tuesday

May 27

10:00
[TBA]
Tuesday

June 3

10:00
[TBA]
Tuesday

June 10

10:00
[TBA]
Tuesday

June 17

10:00
[TBA]
Tuesday

June 24

10:00
[TBA]


SUMMER BREAK










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