search

rodluger / planetplanet

A general photodynamical code for exoplanet light curves
https://rodluger.github.io/planetplanet
GNU General Public License v3.0
45 stars 1 forks source link

Other systems to consider #34

Closed rodluger closed 7 years ago

rodluger commented 7 years ago

HD 219134 (Gliese 892): seven planets, but only one transits. System is 6.6 pc away. Could use PPOs to get radii of the other planets. It's not a compact system, though :/

rodluger commented 7 years ago

Kepler-444, of course: https://en.wikipedia.org/wiki/Kepler-444

rodluger commented 7 years ago

@Jake, could you run the numbers for Kepler-444 just in case?

ericagol commented 7 years ago

What would you like me to do for this?

jlustigy commented 7 years ago

Alright, Kepler-444 is not looking good for secondary eclipses (and PPOs). First, assumptions: I made estimates for Kepler-444b, where I assumed an albedo A=0.25 and an emissivity e=1.0, and find an equilibrium temperature for planet b of Tp=959 K. I also estimate the transit duration to be 138 minutes. So here are SNRs for a single secondary eclipse in each of the MIRI filter bands: [image: Inline image 2] If we "stack" 100 occultations, then you can go ahead and multiply the y-axis SNRs by 10 to finally achieve a SNR~3.0 in the 7.6 micron filter. These results are driven primarily by the distance (36 pc), and the larger and hotter star (0.7 Rsun, 5040 K), which makes these small, yet hot planets incredibly difficult to detect with JWST.

Jake

On Sun, Jul 23, 2017 at 5:11 PM, Eric Agol notifications@github.com wrote:

What would you like me to do for this?

— You are receiving this because you were assigned. Reply to this email directly, view it on GitHub https://github.com/rodluger/planetplanet/issues/34#issuecomment-317292553, or mute the thread https://github.com/notifications/unsubscribe-auth/AIeJIte8jQLuOYiCfbC7mjQwT6Ky_18Yks5sQ-E1gaJpZM4OgAin .

-- Jacob Lustig-Yaeger Astronomy & Astrobiology Graduate Student University of Washington jlustigy.github.io

rodluger commented 7 years ago

Awesome. Can you add this to the discussion section? I currently have a few sentences on Kepler-444 in "Other applications", but this may deserve its own brief subsection.