Postdoc -the Impact of Ob Runaway Stars On The

3 maanden geleden

Amsterdam, Nederland Universiteit van Amsterdam Voltijd

Postdoc -The Impact of OB Runaway Stars on the Dynamical and Chemical Evolution of the Galaxy

**Faculteit/Dienst**:Faculteit der Natuurw., Wiskunde & Informatica**Opleidingsniveau**:Universiteit**Functie type**:Wetenschappelijk Personeel**Sluitingsdatum**:30 September 2024**Vacaturenummer**:13367- We plan to start a post-doctoral position at the Anton Pannekoek Institute for Astronomy (API) of the University of Amsterdam to study the impact of OB runaways on the dynamical and chemical evolution of the Galaxy exploring the ESA _Gaia _database_. _The post-doc will be embedded in the research group focused on the formation, evolution and fate of massive stars led by Prof. Dr. Lex Kaper and Prof. Dr. Alex de Koter in Amsterdam.- A significant fraction of the most massive stars travel through the interstellar medium at high velocity, up to 200 km/s: these are the so-called OB-runaway stars. They are produced via two different channels: (i) Dynamical ejection: during and right after star formation in a young massive cluster; (ii) Via the binary supernova scenario: when in a massive binary system the initially most massive star explodes as a supernova, the secondary star receives a kick velocity comparable to its original orbital velocity. Little is known about the observed runaway properties from either ejection scenario, as it requires disentangling the two scenarios, also a hybrid scenario is possible.- The OB runaways escape from their natal cloud, and with their powerful ionizing radiation and strong stellar wind they inject momentum and energy efficiently into the tenuous interstellar
- and inter-galactic medium. Their eventual supernova may occur in a low-density region, creating an outflow that leaves the galaxy, such that material escapes rather than enriches the galaxy. The revolutionizing ESA _Gaia _astrometry mission provides the opportunity to obtain detailed information on the physical properties of the OB runaways in our Galaxy and even beyond.**What are you going to do**?**
- You will search for OB runaways in the Galaxy, as well as in our close neighbors the Large and Small Magellanic Cloud, using _Gaia _astrometry.
- You will estimate the impact of OB runaways on the derivation of the high-mass end of the initial mass function. Also, you will predict the explosion sites of the OB runaways and to quantify the impact of OB runaways on the dynamical and chemical evolution of the Galaxy.
- You will be a pro-active member of the massive star research group at API, being exposed to a vibrant scientific environment including master students, PhD students, and take part in the definition of their research projects and their supervision.

**What do we require**?**- a PhD in astronomy (or the equivalent),
- a strong background in astrometry and experience with the use of _Gaia _data
- a track record of publications in the field
- excellent oral and written communication skills in English.

**Our offer**
- A temporary contract for 38 hours a week, preferably starting on 1-1-2025. The position is offered for a period of 2 years.-
- Are you curious about our extensive package of secondary employment benefits like our excellent opportunities for study and development? Take a look here.**Questions?**
- Do you have questions about this vacancy? Or do you- Prof. Dr. Lex Kaper
- Tel. + 31 (0)20 525 7491

**About the Faculty of Science and the Anton Pannekoek Institute of Astronomy**
- The Faculty of Science has a student body of around 7,000, as well as 1,600 members of staff working in education, research or support services. Researchers and students at the Faculty of Science are fascinated by every aspect of how the world works, be it elementary particles, the birth of the universe or the functioning of the brain.- The Anton Pannekoek Institute for Astronomy (API) furthers research, teaching and public understanding of astronomy. It conducts astronomical research and trains astronomers from bachelor to postdoctoral level, aiming at world-leading levels and activities.**Application**
- The UvA is an equal-opportunity employer. We prioritize diversity and are committed to creating an inclusive environment for everyone. We value a spirit of enquiry and perseverance, provide the space to keep asking questions, and promote a culture of curiosity and creativity._
- A knowledge security check can be part of the selection procedure.
(for details: National knowledge security guidelines)- a CV; Please mention the months (not just years) in your CV when referring to your education and work experience;
- a statement of research experience and motivation (maximum 3 pages);
- the names of three references.- The UvA is an equal-opportunity employer. We prioritise diversity and are committed to creating an inclusive environment for everyone. We value a spirit of enquiry and perseverance, provide the space to keep asking questions, and promote a culture of curiosity and creativity._
- No agencies please._

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