LERMA UMR8112

Laboratoire d’Études du Rayonnement et de la Matière en Astrophysique et Atmosphères



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Open PHD position in Astrophysics

publié le

(October 2017)

Subject :

Sulphur-bearing molecules in star forming regions : Observational and laboratory investigations.

Supervisors :

L.E. Kristensen (Niels Bohr Institute & Natural History Museum of
Denmark, University of Copenhagen), F. Dulieu (LERMA, University of Cergy-Pontoise & Paris Observatory)

Thesis work.

The thesis aims at tackle the problem sulphur chemistry in star forming regions and in particular the of the origin of H2S in ices, as well as its link with other observed forms in shocks. One half of the work will be devoted to laboratory astrophysics. Using the experimental set-ups located in Neuville-sur-Oise (FORMOLISM and VENUS), the synthesis of H2S and the properties of the ice formed will be investigated. The experimental work will be done with the help of the team (https://lerma.obspm.fr/spip.php?article48). The other part will be devoted to the analysis of observations of sulphur bearing molecules in shocks, and will be mostly done in Copenhagen.

Practical details.

The grant will be a doctoral contract which is a 3 years working contract following
French/European regulations (1758€ monthly gross salary). The student will follow the courses and regulations of Doctoral School of Science and Engineering of Paris Seine University, (ED 417 http://www.collegedoctoral.u-cergy.fr/). The starting date is October 1st 2017 or as soon as possible thereafter. It is funded by ’Initiative excellence Paris Seine’

Application.

Applicant must have a master degree in Science, especially in Astrophysics, Physics or Chemistry. An experience (Internship, master diploma...) in radioastronomy or
experimental physics would be an effective positive aspect of the application.

Applicant must have excellent communication skills in English (oral and written), which will be the working language, although student will follow French language training (part of Doctoral School educational program), and may even learn Danish, Italian and few others languages with the team crews if motivated.

Applications should be constituted of a detailed CV, a letter of motivation and a letter of intent. The candidate should furthermore arrange for a recommendation letter from a professor familiar with the applicant to be sent to both Pr Dulieu and Dr Kristensen.
Applications received before 5th of september will receive full consideration.

More details : francois.dulieu@u-cergy.fr or lars.kristensen@nbi.ku.dk

Séminaires à venir

Vendredi 23 octobre 2020, 14h00
téléconférence Zoom,
The role of molecular filaments in the origin of the IMF
Philippe ANDRÉ
CEA, Laboratoire d’Astrophysique AIM Paris-Saclay
résumé :
The origin of the stellar initial mass function (IMF) is one of the most debated
issues in astrophysics. I will discuss new insights into this problem based on a systematic census of prestellar cores and molecular filaments in nearby clouds taken as part of the Herschel Gould Belt survey, as well as higher-resolution observations with APEX/ArTéMiS and ALMA. Our results point to the key role of the quasi-universal filamentary structure pervading molecular clouds. They suggest that the dense cores making up the peak of the prestellar core mass function (CMF) - and indirectly the peak of the IMF - result from gravitational fragmentation of molecular filaments near the critical mass per unit length. The Salpeter power-law tail of the CMF/IMF may be at least partly inherited from the filament line mass function (FLMF), which is observed to follow a Salpeter-like power law in the regime of thermally supercritical filaments.

 
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