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Adelheid Thiemann

Profile summary

  • Research Student
  • Research Student
  • Faculty of Science, Technology, Engineering & Mathematics
  • School of Physical Sciences
  • heidi.thiemann

Professional biography

The SuperWASP all-sky survey is the most successful ground-based search for transiting exoplanets, having discovered more than 150 hot Jupiters. Not only has it discovered numerous exoplanets, but it has also produced an archive of more than 30 million high cadence light curves. Approximately 1 million such light curves have detectable photometric periodicities on time-scales from hours to years. Previous work has utilised this archive to investigate stellar evolution, with a focus on eclipsing binaries and stellar multiplicity.
An initial cross-correlation by Norton et al (2006) of SuperWASP observations and ROSAT X-ray sources identified numerous new periodic variable stars. Following in their footsteps, I have focused on the cross-correlation of a new period search of the SuperWASP archive, containing ~ 1.3 million objects, with the new data release of the 3XMM X-ray catalogue (XMM-DR8), containing ~ 0.5 million unique objects.
We have cross-correlated SuperWASP photometric data, XMM-Newton X-ray data, and Gaia-DR2 parallaxes to identify unique stars displaying a rotational modulation in their light curve, with corresponding X-ray observations, and real, definable distances. We used 523 stars identified to characterise the power law slopes of the rotation-activity relation. This represents the largest sample of field stars used to characterise the rotation-activity relation, and the first time the rotation-activity relation has been characterised for the very slowest rotators.
In a serendipitous discovery, we have identified >20 candidate near-contact red giant eclipsing binary stars, a configuration not previously known. We are conducting a year-long campaign of photometric and spectroscopic follow-up to characterise and model these candidate binaries. 

I completed a master's in Physics with Space Science and Technology at the University of Leicester in 2017.

 

Research interests

Astronomy, astrophysics, stellar formation and evolution.