- This event has passed.
Speaker: Bruce Macintosh Title: Direct imaging of extrasolar planets- Thursday, April 20 at 4pm
April 20, 2023 @ 4:00 pm - 5:00 pm
This is an In-Person [HYBRID] Event
Date: Thursday, April 20, 2023
Location: Sessler Conference Room- 50A-5132
Time: 4:00- 5:00 pm
Speaker: Bruce Macintosh
Title: Direct imaging of extrasolar planets
Abstract: Direct detection of extrasolar planets – spatially resolving a planet from its host star while blocking, moving, or post-processing the starlight – is a powerful complement to transit, RV, and microlensing approaches. Direct detection is sensitive to planets in wider orbit, and allows spectroscopic characterization of planetary atmosheres. One of the most effective instruments in this regime has been the Gemini Planet Imager (GPI). GPI was a facility instrument combining advanced adaptive optics, a diffraction-controlling coronagraph, and an infrared integral field spectrograph on the Gemini South Telescope. From 2014-2019 we carried out the Gemini Planet Imager Exoplanet Survey (GPIES), which observed 532 young (10-200 Myr) nearby stars. I will describe the instrument, summarize the key results of the GPIES program, including constraints on giant-planet distributions and atmospheric properties. We have also extensively characterized GPI’s performance, leading to insights into next-generation systems.
With current technology, direct imaging with GPI or other instruments is sensitive primarily to planets that are significantly younger than, more massive than, and in wider orbits than Jupiter, and such planets are rare. Moving beyond this will require new capabilities. The GPI 2.0 project upgrades the existing instrument with faster adaptive optics, better coronagraph designs, and new spectrograph modes.When deployed on Gemini North, GPI 2.0 will be able to search younger stars in the Taurus and Ophiucus star-forming regions, and be sensitive to Jupiter-like “cold start” planets. I will summarize the science drivers that guided the GPI 2.0 upgrade and the project’s status.
Zoom Information
Join Zoom Meeting
https://lbnl.zoom.us/j/98854322464?pwd=K2tKUm1VZjRlV1J5RHE3cXdHQzRxdz09
Meeting ID: 988 5432 2464
Passcode: 142239