Northwestern Events Calendar

Dec
1
2017

CIERA Interdisciplinary Colloquium & EPS Seminar: Dan Tamayo (University of Toronto), "A Million-fold Speedup in the Dynamical Characterization of Multi-planet Systems"

Dan Tamayo

When: Friday, December 1, 2017
2:00 PM - 3:00 PM CT

Where: Technological Institute, L211, 2145 Sheridan Road, Evanston, IL 60208 map it

Audience: Faculty/Staff - Student - Public - Post Docs/Docs - Graduate Students

Cost: Free

Contact: Gretchen Oehlschlager   (847) 467-1338

Group: CIERA - Conferences/Collab Meetings

Category: Lectures & Meetings

Description:

Free and open to the public. No registration or ticket required.

Northwestern University's Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA) and the Department of Earth and Planetary Sciences Present: a joint CIERA Interdisciplinary Colloquium & EPS Seminar

Dan Tamayo
University of Toronto's Centre for Planetary Sciences (CPS) and the Canadian Institute for Theoretical Astrophysics (CITA)
Hosts: Fred Rasio, Seth Jacobson, Sourav Chatterjee

A Million-fold Speedup in the Dynamical Characterization of Multi-planet Systems

Many of the multi-planet systems discovered around other stars are dynamically packed to capacity. This implies that orbital integrations with masses or orbital parameters too far from the actual values will destabilize on short timescales; thus, long-term dynamics allows one to constrain the orbital architectures of many closely packed multi-planet systems. I will present a recent such application in the TRAPPIST-1 system, with 7 Earth-sized planets in the longest resonant chain discovered to date. In this case the complicated resonant phase space structure allows for strong constraints. A central challenge in such studies is the large computational cost of direct integrations, which preclude a full survey of the high-dimensional parameter space of orbital architectures allowed by observations. I will discuss our recent successes in training machine learning models capable of reliably predicting orbital stability a million times faster than direct integrations. This opens a wide discovery space for exoplanet characterization and planet formation studies as the next generation of spaceborne exoplanet surveys prepare for launch next year.

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