Lund University, Faculty of Science, Department of Astronomy and Theoretical Physics

Lund University was founded in 1666 and is repeatedly ranked among the world’s top 100 universities. The University has 40 000 students and 7 400 staff based in Lund, Helsingborg and Malmö. We are united in our efforts to understand, explain and improve our world and the human condition.

The Faculty of Science conducts research and education within Biology, Astronomy, Physics, Geosciences, Chemistry, Mathematics and Environmental Sciences. The Faculty is organized into nine departments, gathered in the northern campus area. The Faculty has approximately 1500 students, 330 PhD students and 700 employees.

The activities of the Department of Astronomy and Theoretical Physics are centred around three main areas: Astronomy and Astrophysics; Theoretical Particle Physics; and Computational Biology and Biological Physics. Our research is driven by our curiosity to understand reality, from the smallest of particles to the largest astronomical structures, as well as the structure of Life itself. We have a strong international position in all three areas, and we are actively working on further strengthening our international profile.

We announce two PhD positions in Astronomy and Astrophysics at the Department of Astronomy and Theoretical Physics.

(1) Validation and exploitation of Gaia data. The scientific community has recently received the second release of Gaia data in April 2018 which delivered positions, parallaxes and proper motions for more than 1.3 billion stars in our Galaxy. While the accuracy of these results is unprecedented they will still not achieve the final accuracy promised for Gaia in the early 2020's. To achieve this final accuracy much work still needs to be done in calibrating the Gaia instrument and characterizing the systematic errors that inevitably occur in such catalogues. Financed by the Swedish National Space Board (PI: David Hobbs)

(2) Formation of moon systems. The four giant planets of the Solar System - Jupiter, Saturn, Uranus and Neptune - are all hosts to extensive systems of moons. The Cassini mission to explore Saturn and its moons ended in 2018, but in 2022 ESA will launch the JUICE spacecraft and NASA will launch the Europa Clipper to study Jupiter's moon system. The formation of moon systems is nevertheless still not well understood, with competing theories stating that the moons either formed in a gaseous subdisc around the host planet or in a primordial disc of ice particles, akin to Saturn's ring but much more massive. Financed by the Knut and Alice Wallenberg Fuondation (PI: Anders Johansen)

Work duties

(1) The student will participate in the Gaia data processing for future data releases, especially improving the calibration models as well as characterizing the quality of the catalogue. Specific topics could include the accuracy of the Gaia reference frame and the parallax zero point, spatial systematic errors and proper motion patterns. Deviations in proper motions of sources between different catalogue releases can be used to indicate the presence of binary or exoplanet systems. Exploitation of the Gaia results for Galactic dynamic studies using insights into the expected correlated errors among the astrometric data is encouraged. This will be especially important when combining data for many stars (for example in clusters), where even small correlations, if not taken into account, may lead to severe underestimation of the actual uncertainties of the results.

(2) The student will run numerical simulations of the dynamics of massive particle discs orbiting around young gas giants and ice giants. Such discs may form at the planet formation stage as pebbles of ice and dust are accreted towards the planet and build up a dense circumplanetary disc due to the conservation of angular momentum. The disc material will mainly reside within the Roche limit where gravitational collapse to form moons is not possible due to the strong tidal force. The student will simulate how such a ring expands outwards due to collisions between the particles and how the outer regions collapse gravitationally to form moons. Such moons will migrate away from the planet due to tides from the remaining disc and this way entire moon systems can form.

Eligibility

The position is open to students of all nationalities who, at the time of starting the PhD studies, have obtained a Masters degree in astronomy, physics or in other ways obtained the equivalent qualifications. In case of uncertainty concerning the applicant's eligibility, it is advisable to contact the department for clarification. The discipline curriculum for postgraduate studies in Astronomy and astrophysics is found at https://www.science.lu.se/sites/science.lu.se.internal/files/syllabi_astronomy.pdf.

Good knowledge in spoken and written English is required.

Basis of assessment

Regulations concerning appointment as a doctoral Studentship can be found in the Swedish Code of Statues 1998:80. To be accepted for postgraduate studies, a student must be judged to have the competence necessary to complete a PhD during the tenure of the appointment. In addition to pursuing postgraduate studies, the doctoral student may be required to perform other duties - including research, teaching and administration - according to the specific regulations.

Application

Candidates should send a curriculum vitae (including a transcript of academic grades) and a brief statement of research interest. The application should also include the names, telephone numbers and e-mail addresses of two persons who have agreed to serve as a reference for the applicant. Note that reference letters should not be sent to us in connection with the application; we will contact the reference persons when required.

Information on the PhD programme: http://home.thep.lu.se/~bijnens/PhD/ 

Type of employment

Limit of tenure, four years according to HF 5 kap 7§.

Type of employment Temporary position longer than 6 months
First day of employment Summer/Autumn 2019 or by agreement
Salary Monthly salary
Number of positions 1
Working hours 100
City Lund
County Skåne län
Country Sweden
Reference number PA2018/3538
Contact
  • Anders Johansen, professor, +46-46-222 15 89, anders@astro.lu.se
  • David Hobbs, universitetslektor, +46-46-46-222 15 73, david@astro.lu.se
Union representative
  • OFR/ST:Fackförbundet ST:s kansli, +46-46-222 93 62
  • SACO:Saco-s-rådet vid Lunds universitet, +46-46-222 93 64
Published 05.Nov.2018
Last application date 01.Dec.2018 11:59 PM CET

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