I recently defended my Ph.D., working at the Max Planck Institute for Solar System Research, searching for extrasolar planets orbiting pulsating stars. Stellar pulsations can be used as an acurate clock. Regular variations in the arrival time of those pulsations indicating that the star is moving back and forth, orbiting the center of mass of a system with one or more planets.
Of special interest are host stars of the subdwarf B (sdB) class. The existence of single sdB stars is not explainable by stellar evolution theory so far. Planets can help to form these kinds of stars if they survive the violent red giant phase of the star. Alternatively second generations planets could form from the inflated envelope of the star.
The timing method is particularly sensitive to planets at large distances and complementary to other exoplanet detection methods because they are not efficient for stars with small radii and high gravities. Thus, the timing method opens up a new parameter range in terms of the host stars and helps to understand the formation process of single sdBs. My work aims to establish this method as a complementary detection method to transits or radial velocity measurements. In consideration of future photometric space missions like PLATO it is essential to enhance the diversity of potential exoplanet host stars that can be probed.
Previously, I investigated the atmosphere of the transiting hot Jupiter TrES-3b using transmission spectroscopy at the Leibniz Institute for Astrophysics Potsdam.
My passion for astronomy grew with a 8" Newtonian telescope. Besides that, I am an enthusiastic photographer, graphic designer and musician.
10/2016: PhD candidate, successfully defended in June 2020, Max Planck Institute for Solar System Research (MPS), University of Göttingen.
10/2014 - 09/2016: Master of Science, University of Potsdam. "Transmission spectroscopy of exoplanet atmospheres - On the Rayleigh-like feature of TrES-3b" - Leibniz-Institute for Astrophysics Potsdam (AIP)
10/2014 - 11/2014: Research assistant, Leibniz-Institute for Astrophysics Potsdam (AIP). Follow-up employment to write the paper on the bachelor thesis.
10/2011 - 09/2014: Bachelor of Science, University of Potsdam. "Detecting planets orbiting the eclipsing polar CSS 081231" - Leibniz-Institute for Astrophysics Potsdam (AIP)
F. Mackebrandt, S. Schuh, R. Silvotti, S.-L. Kim, D. Kilkenny, E. M. Green, R. Lutz, T. Nagel, J. L. Provencal, T. Otani, T. D. Oswalt, S. Benatti, L. Lanteri, A. Bonanno, A. Frasca, R. Janulis, M. Paparó, L. Molnár, R. Claudi, and R. H. Østensen. The EXOTIME project: Signals in the O-C diagrams of the rapidly pulsating subdwarfs DW Lyn, V1636 Ori, QQ Vir and V541 Hya. A&A, Vol. 638, id.A108, 19 pp, June 2020. ADS
K. G. Strassmeier, I. Ilyin, E. Keles, M. Mallonn, A. Järvinen, M. Weber, F. Mackebrandt, J. M. Hill. High-resolution spectroscopy and spectropolarimetry of the total lunar eclipse January 2019. A&A, Vol. 635, id.A156, 19 pp, March 2020. ADS
F. Mackebrandt, M. Mallonn, J. M. Ohlert, T. Granzer, S. Lalitha, A. García Mũnoz, N. P. Gibson, J. W. Lee, A. Sozzetti, J. D. Turner, M. Vaňko, and K. G. Strassmeier. Transmission spectroscopy of the exoplanet TrES-3b: New transits from the near-UV to the near-IR and a reanalysed GTC observation. A&A, Vol. 608, id.A26, 13 pp, December 2017. ADS
M. Mallonn, I. Bernt, E. Herrero, S. Hoyer, J. Kirk, P. J. Wheatley, M. Seeliger, F. Mackebrandt, C. von Essen, K. G. Strassmeier, T. Granzer, A. Künstler, V. S. Dhillon, T. R. Marsh, and J. Gaitan. Broad-band spectrophotometry of HAT-P-32 b: search for a scattering signature in the planetary spectrum. MNRAS, 463: 604–614, November 2016. ADS
A. D. Schwope, F. Mackebrandt, B. D. Thinius, C. Littlefield, P. Garnavich, A. Oksanen, and T. Granzer. Multi-epoch time-resolved photometry of the eclipsing polar CSS081231:071126+440405. Astronomische Nachrichten, 336:115, February 2015. ADS
05/2019: Large Binocular Telescope, 8.4m, PEPSI. Clouds on a planetary dayside revealed by its wavelength-resolved albedo. PI: M. Mallonn, CoI: C. von Essen
05/2019: LCO, 2m. Planets around V391 Peg b II, CoIs: S. Schuh, H. Perets
05/2018: Large Binocular Telescope, 8.4m, PEPSI. Earth as an extrasolar Planet - Lunar eclipse observation 2019 Jan 21 using LBT & PEPSI. CoIs: Engin Keles, Carolina von Essen, Klaus Strassmeier
05/2017: LCO, 2m. Planets around V391 Peg b, CoIs: S. Schuh, H. Perets
02/2016: Calar Alto Observatory, 2.2m, CAFOS, DDT. Photometric observation of one B-band transit of the exoplanet TrES-3b.
02/2016: Byurakan Astrophysical Observatory (BAO), 2.6m, SCORPIO. Photometric observation of two B-band transit of the exoplanet TrES-3b. CoIs: K. G. Strassmeier, M. Mallonn
02/2016: Telescopio Nazionale Galileo (TNG), 3.58m, DOLORES, DDT. Photometric observation of one U-band transit of the exoplanet TrES-3b. CoIs: K. G. Strassmeier, M. Mallonn
2020 Sagan Exoplanet Summer Virtual Workshop - Extreme Precision Radial Velocity Website
Max Planck geht in die Schule 2018 (Public Talks at Theodor-Heuss-Gymnasium and Bonifatiusschule II Göttingen) Website
Basics of Astrobiology Summer School Website
Astronomisches Sommerlager 2018 (Public Talk) Website
The PLATO Mission Conference 2017: Exoplanetary systems in the PLATO era (Poster) Website
2nd Advanced School on Exoplanetary Science (Poster) Website
10/2018 - 02/2019: Tutor "Physikalisches Praktikum" (J. Große-Knetter) at the II. Institute of Physics, Göttingen. Supervision of lab courses.
04/2018 - 08/2018: Teaching assistant "Solar System Science: The Planetary System" (Ulrich Christensen et al.) at the Institute for Astrophysics, Göttingen. Conducting exercises linked to the lectures.
10/2016 - 02/2017: Tutor "Lab Course" (S. Jeffers) at the Institute for Astrophysics, Göttingen. Astronomical data reduction (PyRAF) including a one-week observing run at the Observatory Haute Provence (1.2 m and 1.5 m telescope).