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Chemodyn

Understanding the chemical and dynamical evolution of pre- and proto-stellar cores


Pre- and protostellar cores represent the earliest stage of the formation of a star. Theses phases are crucial for the future evolution of the star, as its final mass and the initial composition of the proto-planetary disk that may eventually form planet will be determined during these phases. In the past years, much progress has been done in our understanding of the chemical structure of these objects, thanks to the dramatic increase of the sensitivity of millimeter and sub-millimeter ground based telescopes. In fact, it is now possible to use chemistry as a tool to constrain both physical and chemical characteristics of these objects. However, most studies so far have used observations with typical resolutions of a few arcseconds, and the physical and chemical structures if cores on smaller scales remain poorly known.

The Chemodyn project aims at studying the physical and chemical properties of a large sample of Class 0 protostars, using both an observational and modelling approach. Our observations are part of an extensive survey of the line and continuum emission from young protostars (CALYPSO: Continuum and Lines from Young Protostellar Objects) with the Plateau de Bure interferometer at sub-arcsecond resolution. In order to analyse these observations, we have developed a model that combines a complete chemical network with a line emission radiative transfer code. The direct comparison between high-angular observations and our model predictions allowed us to place important constraints on the formation and evolution of pre- and protostellar cores.

Chemodyn is a fundamental research project lead by Sébastien Maret from Institut de Planétologie et d’Astrophysique de Grenoble (IPAG). The project started in January 2012 and last for 48 months. It is funded by a 243 k€ ANR grant, and it total cost is about 896 k€.

Publications

Maret, S.; Bergin, E. A.; Tafalla, M., Chemical modeling of the L1498 and L1517B prestellar cores: CO and HCO+ depletion, Astronomy and Astrophysics 559, 13 (2013)

Maret, S.; Belloche, A.; Maury, A. J.; Gueth, F.; André, Ph.; Cabrit, S.; Codella, C.; Bontemps, S., First results from the CALYPSO IRAM-PdBI survey. I. Kinematics of the inner envelope of NGC 1333-IRAS2A, Astronomy and Astrophysics 563, 6 (2014)

Maury, A. J.; Belloche, A.; André, Ph.; Maret, S.; Gueth, F.; Codella, C.; Cabrit, S.; Testi, L.; Bontemps, S.Maury A., Belloche, A., André, Ph., First results from the CALYPSO IRAM-PdBI survey. II. Resolving the hot corino in the Class 0 protostar NGC 1333-IRAS2A, Astronomy and Astrophysics 563, 10 (2014)

Codella, C.; Maury, A. J.; Gueth, F.; Maret, S.; Belloche, A.; Cabrit, S.; André, Ph., First results from the CALYPSO IRAM-PdBI survey. III. Monopolar jets driven by a proto-binary system in NGC 1333-IRAS2A, Astronomy and Astrophysics 563, 7 (2014)

Anderl, S.; Maret, S.; Cabrit, S.; Belloche, A.; Maury, A. J.; André, Ph.; Codella, C.; Bacmann, A.; Bontemps, S.; Podio, L.; Gueth, F.; Bergin, E., Probing the CO and methanol snow lines in young protostars. Results from the CALYPSO IRAM-PdBI survey, Astronomy and Astrophysics 591, 20 (2016)

Santangelo, G.; Codella, C.; Cabrit, S.; Maury, A. J.; Gueth, F.; Maret, S.; Lefloch, B.; Belloche, A.; André, Ph.; Hennebelle, P.; Anderl, S.; Podio, L.; Testi, L., Jet multiplicity in the proto-binary system NGC 1333-IRAS4A. The detailed CALYPSO IRAM-PdBI view, Astronomy and Astrophysics 584, 9 (2015)

Podio, L.; Codella, C.; Gueth, F.; Cabrit, S.; Maury, A.; Tabone, B.; Lefèvre, C.; Anderl, S.; André, P.; Belloche, A.; Bontemps, S.; Hennebelle, P.; Lefloch, B.; Maret, S.; Testi, L., First image of the L1157 molecular jet by the CALYPSO IRAM-PdBI survey, Astronomy and Astrophysics 593, 5 (2016)

De Simone, M.; Codella, C.; Testi, L.; Belloche, A.; Maury, A. J.; Anderl, S.; André, Ph.; Maret, S.; Podio, L., Glycolaldehyde in Perseus young solar analogs, Astronomy and Astrophysics 599, 22 (2017)

Maret, S. et al., A search for Keplerian disks around Class 0 protostars with CALYPSO, Astronomy and Astrophysics, in prep. (2017)

Anderl, S. et al. Probing episodic accretion with chemistry: CALYPSO observations of IRAM 04191+1522, Astronomy and Astrophysics, in prep. (2017)

Codes