CTC Seminar for 2023-04-12

Series: CTC Seminar
Date: Wednesday 12-Apr-2023
Time: 11:30-12:30 pm
Location: PSC 1136
Speaker: Sam Grunblatt (Johns Hopkins)
Title: Giants Transiting Giants: Revealing planet demographics of post-main sequence systems

Despite the thousands of planets discovered orbiting stars on the main sequence, the planetary systems of more evolved stars remain poorly understood. Studying planetary systems around subgiant and red giant stars can reveal how main sequence planetary systems respond to stellar evolution over time. The 'Giants Transiting Giants' survey has increased the number of planets known transiting evolved stars by a factor of three. These planetary systems provide testbeds for understanding planet inflation, orbital alignment, decay, and chaotic disruption, planet engulfment and related chemical enhancement of host stars. Recent studies have revealed that the orbital configurations of these systems differ from those of main sequence systems--planets around evolved stars seem to follow unique period-eccentricity and orbital alignment trends that are not seen in main sequence systems. Furthermore, the discovery of a low-density hot Neptune around a red giant star suggests that these planets are more resilient to atmospheric erosion than previously thought. Future studies of these and similar systems with JWST and other upcoming missions will reveal how planet atmospheres respond to the evolution of their host stars, and will eventually bridge the gap between main sequence and white dwarf planetary systems, teaching us about the eventual fate of Solar Systems such as our own.

Guidelines and format for the CTC Lunch seminars.
Past CTC Lunch seminars.
For other questions, contact the CTC Lunch host: Shmuel Bialy


Special accommodations for individuals with disabilities can be made by calling (301) 405-3001. It would be appreciated if we are notified at least one week in advance.


Directions and information about parking can be found here.

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