Astrophysics Brown Bag Lunch Talk 10/25/2021: Speakers: Sophie Lund Schrøder (University Of Copenhagen) And Alexis Heitzmann (University Of Southern Queensland)

Monday October 25, 2021 12:00 pm
via Zoom

Monday, October 25

12:00 – 12:30pm

Sophie Lund Schrøder, University of Copenhagen

LIGO sources formed in Fallback Supernovae

Abstract: I will discuss my work on simulating the formation of compact object binaries from weak fallback supernovae and the impact this has on the distribution of masses of LIGO-Virgo sources. I use 3D hydrodynamical simulations of fallback supernova in close binary systems to investigate the final black hole masses and spins. By systematically varying the explosion energy and the binary pre-supernova properties, we are able to explore the effects that the companion has on redistributing the angular momentum of the system. Finally, I will present my preliminary work on the formation of double neutron stars in weak fallback supernovae, which can explain the formation of heavy binary neutron star systems such as GW190425.

Bio: My name is Sophie Lund Schrøder (she/her). I am currently a PhD student at Dark, which is part of the Niels Bohr Institute in Copenhagen. My research focuses on understanding the flow of mass and angular momentum during binary evolution leading to double compact objects.



12:30 – 1:00pm

Alexis Heitzmann, University of Southern Queensland

What do we learn from the obliquity of the youngest transiting hot Jupiter-sized planet?

Abstract: Orbit obliquity, i.e. the angle between the stellar rotation axis and the orbital normal of the planet, of very young short-orbit gas giant exoplanets could help disentangling their true primordial orbits and deliver crucial insights on their formation and evolution pathways. HIP 67522 is a 17-Million-year-old Solar analogue that hosts a close-in Jupiter-sized exoplanet with an orbital period of 6.95 days. In this talk, I will show how we measured HIP 67522 b’s obliquity and discuss the implications of this finding.

Bio: My name is Alexis Heitzmann, I am a final year PhD at the University of Southern Queensland in Toowoomba, Australia. My research focuses on planets around young stars. More specifically I am interested in determining young planets characteristic (mass, radius, obliquity) and therefore I also work on spurious stellar activity induced signature mitigation. In the future I wish to contribute to developing improved/new mitigation strategies and keep working on TESS follow-ups. As a side activity, I coordinate target selection and scheduling of targets for MINERVA-Australis, an Australian telescope array dedicated to TESS follow-ups.


Event Contact

Josh Borrow