STAGE Spectroscopy of exoplanets from transit space & ground based observations

Date de mise à jour de l’offre

CNRS - Institut d'Astrophysique de Paris :

Unité Mixte de Recherche CNRS-Sorbonne Université

Description de la mission

Context : Current exoplanet observations demonstrate that the solar system is not the paradigm in our galaxy. One of the outstanding questions of modern astrophysics is to understand why. The Ariel space mission (2029) will address this fundamental question by measuring directly the chemical composition of 1000 exoplanetary atmospheres, using transmission and emission spectroscopy of transiting systems. Spectroscopic measurements of a large sample of planetary atmospheres divulge their atmospheric chemistry, dynamics and interior structure, which traces back to planetary formation and evolution. During a transit, when the light from a star is partially blocked by a planet, we can perform a differential observation that will measure a transmission spectrum of the thin atmospheric ring of the planet at its terminator. Another set of differential measurements can be taken when the planet is being occulted by the star to reveal the emission spectra of the dayside of the planet. Such measurements are being made today using the Hubble Space Telescope, and will probably represent about 6-10 % of the JWST load after its launch in 2021. They are paving the way for ESA/Ariel mission that will be the game changer for the exoplanet community.
Workplan :
As part of the stage-M2, the student will learn to analyse HST WF3 archive data using up to existing pipelines and tools, for example Iraclis to extract the exoplanet spectrum and TauREX to retrieve the temperature - pressure profile, identify molecules and discuss the presence of clouds. In a last section of the work the student will perform simulation of observations to be done with JWST and Ariel.

It is similar to the work presented in the suite of papers of the Ariel School, Edwards et al., Skaf et al., Pluriel et al., Guilluy et al. Since it is a very competitive field the exact target will be chosen with the students shortly before the M2 training period.

Environment:
the work will be made in the environment of Institut d'Astrophysique de Paris in the Ariel team (3 research scientists, 2PhD)in collaboration with
- LESIA (Obs. Paris) for atmospheric simulations
- international UCL team (I. Waldmann) described on
https://github.com/ucl-exoplanets
The M2-stage can be expanded in a PhD thesis (a proposal has been submitted to CNES for ED127)

See also : http://www.iap.fr/useriap/beaulieu/ARIEL/ARIEL-School2019-index.html
<http://www.iap.fr/useriap/beaulieu/ARIEL/ARIEL-School2019-index.html>

Profil recherché

Traitement du signal, méthodes numériques, astrophysique

Niveau de qualification requis

Bac + 4/5 et +
  • Employeur
    CNRS - Institut d'Astrophysique de Paris
  • Secteur d’activité de la structure
    Enseignement - Formation - Recherche
  • Effectif de la structure
    De 51 à 250 salariés
  • Site internet de la structure
    http://www.iap.fr
  • Type de stage ou contrat
    Stage pour lycéens et étudiants en formation initiale
  • Date prévisionnelle de démarrage
  • Durée du stage ou contrat
    Plus de 2 mois et jusqu'à 4 mois
  • Le stage est-il rémunéré ?
    Oui
  • Niveau de qualification requis

    Bac + 4/5 et +
  • Lieu du stage
    CNRS - Institut d'Astrophysique de Paris
    98 bis Boulevard Arago
    75014 PARIS 14E ARRONDISSEMENT
  • Accès et transports
    RER, Métro Denfert-Rochereau