And we’re off again with session 4 and direct imaging of exoplanets
I think we had about 100 total new exoplanets announced yesterday:
55 from CORALIE/HARPS, 23 from WASP, 12 from Kepler, 10 from PSU-Torun
and assorted others.
I zonked out on the evening debate on ηEarth last night, chaired by Andrew Howard.
The interesting thing is that when I were a lad, oh so many years ago, the debate would have been about the LOG(η).
Optimists might have argued for 10-1, and pessimists for 10-6 or less for fraction of stars with Earth like planets.
Now the argument is pretty much focused on whether it is 0.5+-0.3 or 0.2+-0.1
about a factor of two spread in the solid estimated.
That is progress.
Ok, I didn’t get the Giant Planet structure model or Rossiter-McLaughlin stuff from session 3 out – look for #ESS2 tweets from @GovertTweets for details
- James Graham with an overview of the Gemini Planet Imager
extreme adaptive imaging on Gemini, survey instrument, v. heavily oversubscribed.
Hope to have it on by mid-2012…
- Nielsen – Gemini NICI
large adaptive optics H-band survey on Gemini South.
- Karl Stapelfeldt – Debris Disk Direct Imaging
Spitzer! Herschel! Hubble!
Dust everywhere, out to hundres of AU, aaaaarrrrrggghhhh, can’t keep up.
Man, Karl rattles it off fast.
Ok 23 known objects resolved
http://circumstellardisks.org has them all catalogued.
Anyway, lots of interesting systems with warm and cool dust, out to hundreds of AU and into single AU, well modeled with various annular models. Consistent with resonance with embedded planets carving the edges of the annular disks.
ALMA next – 100 proposals selected for first round, some will be debris disks, we think we don’t actually know. Anybody know?
Try balloon IR coronograph? Zodiac II Traub et al concept.
- Ray Jayawardhana – read his book, Strange New Worlds – it is a good read and I owe him a review….
anyway Ray Jay is talking about the giant planet/brown dwarf border
imaging of 10-50 M_J obrects at 100++ AU – found several
nearby young, hard to get good mass calibration because of uncertainty over “hot start” vs “cold start” models – his objects consistent with “hot start” – that could be important
all right, some trash talking here on just what is a planet and who has seen one…
- Konopacky – HR8799
constraining the orbits of the planets
extracting from archival data – 13 years of data on outer three planets, only a couple for the innermost planet
monte carlo modeling to try to constrain orbits and masses
best fit – 800 yr period for hr8799b with low e and ~45 inc
models consistent with coplanarity
c and d can have modest eccentricities but stability limits eccentricity
astroseismology suggests star is tipped 40 degrees or more – so consistent with equatorial orbits
not found a dynamically dtable solution for 10 M_J planets and 60 Myr age
can find resonant solutions of 7, 7, 7, 5 M_J and age < 30 Myr wanna look at it with GPI... Editorial comment: I still think HR 8799 is a blue straggler and most all the stability analysis and age estimates are just completely off, but then again I am not infrequently wrong, and proud of it....
- Fitzgerald – imaging of perturbed debris disk
HD 61005 – G dwarf 50-100 Myr 35 pc
lots of dust
disk messed up, maybe hiding a planet
maybe ISM interaction through ram pressure