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Portail > Offres > Offre UMR7095-JEABEA-003 - "Chercheur postdoctoral en planétologie, microlensing analyse Bayesienne (H/F)"

Postdoctoral researcher in planetology, microlensing, bayesian analysis (H/F)

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Français - Anglais

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General information

Reference : UMR7095-JEABEA-003
Workplace : PARIS 14
Date of publication : Thursday, January 31, 2019
Type of Contract : FTC Scientist
Contract Period : 4 months
Expected date of employment : 1 April 2019
Proportion of work : Full time
Remuneration : Between 2606 and 3615 euros gross/month (between 2118 and 2914 euros net/month) depending on experience following cnrs grids
Desired level of education : PhD
Experience required : Indifferent


The COLD-WORLDS project, funded by the ANR over the period 2019-2022, uses the technique of gravitational microlenses to explore a unique niche: cold planets whose mass can be as small as that of the Earth and orbiting all types of stars (even stellar remanents), old planets in large orbits. To improve the accuracy of the mass and distances of the detected planetary systems, COLD-WORLDS uses observations with very high angular resolution cameras such as the KECK, VLT, SUBARU and HST. The objective is to separate the source star and the lens star (unresolved) from other stars in the Bulb of the unresolved galaxy without the high resolution. Thus we can constrain the flow of the lens star and its mass. One of the complications comes from the fact that other sources can contribute to and bias this measure of lens star flux.

The 4-month mission consists in writing a numerical code, performing a Bayesian analysis to estimate the probabilities of the different scenarios (contribution of another star aligned at better than 100 mas, a companion around the source or another companion around the unsolved lens). Refer to Section 7 of Koshimoto et al, 2017, Astronomical Journal, 154, 3, as well as Figures 5, 6, 7 and Table 5. See also Beaulieu et al, 2018, Astronomical Journal, 155, 2 section 3, figures 2 and 3.


The work will be carried out in close collaboration with Jean-Philippe Beaulieu and Patrick Tisserand, and will be assigned to the Institut d'Astrophysique de Paris, 98bis Boulevard Arago, 75014 PARIS.

The activities will be in particular the writing of a code that will estimate the different contributions to the excess flow measured aligned with the source. This code will then be used within COLD-WORLDS on about 100 systems to measure the mass function of cold planets under the project. This code will eventually be made available to the community.


Expected skills: thesis in astrophysics, strong competence in Bayesian analysis and good understanding of the two articles mentioned in the job description.
We invite candidates to apply before February 22, 2019, by sending their application by email to J.P. Beaulieu (beaulieu@iap.fr) and to submit it on the application form of the CNRS Employment Portal. The file will include a detailed CV, giving competence and experience, publication list, 2-page cover letter. Short list candidates will be contacted by email for an interview within the following week.

Work Context

The Institut d'Astrophysique de Paris is a joint CNRS Sorbonne University unit. It has about 150 researchers, engineers, technicians, administrative staff, post-doctoral fellows and doctoral students.

Date of taking up office and duration of the contract: ideally beginning on April 1, 2019 (to be discussed) for a period of 4 months at the Institut d'Astrophysique de Paris.
The remuneration will be estimated according to the candidate's experience and seniority, on the CNRS salary scales for a research fixed-term contract (between 2606 and 3615 euros gross/month (between 2118 and 2914 euros net/month) depending on experience).

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