Team Organization

PI : Philippe André (CEA/AIM SAp)


WG1 : Anaëlle Maury (CEA/AIM SAp)

WG2 : Claudio Codella (INAF Arcetri)

WG3 : Sébastien Maret (IPAG)

WG4 : Patrick Hennebelle (CEA/AIM SAp)

Frédéric Gueth (IRAM)

Sylvie Cabrit (LERMA / IPAG)

Arnaud Belloche (MPIfR, Bonn)

Bertrand Lefloch (IPAG)

Leonardo Testi (ESO / INAF Arcetri)

Sylvain Bontemps (LAB)

Aurore Bacman (IPAG)

Ralf Klessen (Heidelberg)

Cornelis Dullemond (MPIA)

Sandrine Bottinelli (IRAP)

Benoit Commercon (ENS Lyon)

Ralf Launhardt (MPIA)

CALYPSO: the IRAM Large Program to solve the angular momentum problem in Class 0 protostars

Despite some progress in the past two decades, the physics of the youngest protostars, Class 0 objects, remains poorly understood.

The formation mechanisms and properties of accretion disks and protobinaries at the Class 0 stage is highly controversial. Likewise, the launching mechanism of protostellar jets and their net contribution to mass and angular momentum extraction during protostar formation is strongly debated. The complex velocity and density structure shaping the inner protostellar environment is also a great puzzle to star formation models.

Solving these issues, which all have a strong bearing on the long-standing “angular momentum problem” of star formation, is of paramount importance.

To this aim, our team carried out a comprehensive, systematic study of the nearest low-luminosity Class 0 objects with the IRAM PdBI and 30-m telescopes.

This concerted observational effort is supported by a parallel MHD simulation effort.

Working Groups

WG1: Protostellar disks and multiple systems (A. Maury, L. Testi, Ph. André; R. Launhardt). This group will focus on the 1.3mm and 2.7mm continuum PdBI data to map the inner structure of dusty Class 0 envelopes, search for compact disks and secondary components on scales <100 AU, and clarify their nature thanks to the molecular line observations analysed by WG2,WG3.

WG2: Molecular jets and outflows (C. Codella, B. Lefloch, F. Gueth, S. Cabrit). This working group will focus on the 12CO and SiO data to trace the structure and kinematics of the molecular outflows and jets, respectively, and correlate them with envelope/disk properties to clarify the mechanisms responsible for protostellar ejection.

WG3: Envelope structure, kinematics, and chemistry (S. Maret, S. Bottinelli, A. Bacmann, A. Belloche). This working group will analyse and model line emission from C18O, N2H+, and CH3OH to unveil the 3D structure, kinematics, and angular momentum of protostellar envelopes from large to small scales, and to probe the heating process and the origin of hot corinos.

WG4: Numerical simulations and radiative transfer (P. Hennebelle, R. Klessen, C. Dullemond, B. Commercon). This working group will carry out a dedicated modeling program, using a chain of three state-of-the art, complementary codes to interpret the PdBI data. 3D MHD numerical simulations of collapsing cores will be carried out using the RAMSES code (eg. Hennebelle & Ciardi 2009) and then coupled to a chemical model (S. Maret) to post-process chemical abundances. The RADMC 3D radiative code (C. Dullemond) will then be used to compute the lines and dust continuum. Finally, these will be processed with the PdBI simulator to produce synthetic observations comparable to the observed maps. All models and reduced datacubes will be put on a public website at the end of the project.

Setups and configurations

  1. -Setup S1 (230 GHz): 12CO(2–1)

  2. -Setup S2 (217 GHz): 13CO(2–1) / C18O(2–1) / SiO(5–4) / e-CH3OH(5–4) / SO(5–4)

  3. -Setup S3 (94 GHz): N2H+(1–0) / CH3OH(2–1)


Configurations A and C of the IRAM PdBI :

synthesized beam 0.4’’

Short spacings from the IRAM 30-m telescope:

primary beam 13’’ at 1mm / 22’’ at 3mm

Sources

Aqu-MMS1

Aqu-OS2a

Serp-S68N

Serp-SMM4

L1172

GF9-2

L1157

L1527

NGC1333-IRAS4B

NGC1333-IRAS4A

NGC1333-IRAS2A

SVS13-B

IRAM04191

L1448-NB

L1448-C

L1448-IRAS2A

L1521F