I ran a splinter session at #Exoplanets5 last week and there was a discussion to have a conference about Beta Pictoris and AU Mic exoplanets and it is taking all the willpower in my British soul not to call it the “Pic and Mics” conference #DadJoke #BetaPic #Astrodon 🔭🪐
In case you're wondering. I caught a cold during #exoplanets5. Not covid! I tested.
However, buying masks in NL is nigh impossible. To the point that the vending automat at Shipol is full but not plugged in.
Even the apothecary looked at me like: you want a mask? Nah!
Ok I'm much better today.
X-ray astronomy is a whole different world for #exoplanets5:
"In 32 hrs of observation, we detected five photons" ... "after several follow-up studies, we now have 18 photons" - Tim Cunningham 🔭
Picture shows a ‘rhino’ inhabited by two actors, following another actor dressed as its keeper down a path in Leiden’s Hortus Botanicus. Astronomers look on in a mixture of confusion and amusement.
So sad to be leaving #Exoplanets5 today - first ever exoplanet meeting to feature a rhino (and probably also the last?) Hope everyone has a wonderful last day.
Thumbs up in front of a poster.
I’m at #exoplanets5 today presenting a poster! Kenny Arnold (former UMD undergrad and postbac, now Wisconsin-Madison grad) has done excellent work simulating JWST limb asymmetries across the hot Jupiter population, and I’m here on his behalf. Come find me in Poster Hall A to chat!! 🔭
Hi #exoplanets5! If you are interested in estimating precise and model independent radius of FGK and M single stars, come and check out my poster today (Friday) in section B. You can also find the paper here: arxiv.org/abs/2406.00229
My poster on GCM dissipation is up in Poster Area C at #Exoplanets5. If you're busy, hungover, or just want to avoid the overcrowded poster area, here is a PNG version. A PDF version can be found at:
www.duncanchristie.net/s/ExoV_Poste...
Diamond-Lowe: companion programme hot rocks stars is looking at M dwarf hosts with HST/COS. This allows characterisation of the hosts and their activity. #Exoplanets5
Hannah Diamond-Lowe is now speaking about the hot rocks survey, testing 9 irradiated planets for atmospheres. So far 5 airless examples, wanted to add some more. Sample spans stellar mass from early to mid M dwarfs. #Exoplanets5
Mansfield: having a well-characterised star is really important for eclipse measurement. Stellar refitting can change interpretations, beware! #Exoplanets5
Now hearing from Megan Weiner Mansfield on looking for secondary eclipses of M dwarf rocky planets to search for atmospheres. The principle of the survey is that temperature measurements can reveal whether or not heat is being transported to the nightside by an atmosphere. Hot=bare. #Exoplanets5
Not allowed to skeet it but new GJ1214b spectrum is 🔥 #Exoplanets5
Last talk of this block is by Kazumasa Ohno on the transmission spectrum of GJ1214b - the cloudy sub Neptune. MIRI spectrum still consistent with a straight line. Does NIRSpec G395H do any better? #Exoplanets5
Brandeker: 55 Cnc e is more than just a bare rock, but measurements confusing (eg optical variability that exceeds perfect reflection limit.) jury is out as to exactly what is going on! #Exoplanets5
Now we are heading from Alexis Brandeker - is it raining lava on 55 Cancri e? He’s giving nothing away at this stage… ! 55 Cnc has a companion M star at 1000 au which i didn’t know. Now going through history of Spitzer hotspot offsets which indicated substantial atmosphere. #Exoplanets5
Welbanks: NIRCam dataset drives detection of ammonia - if we want to find ammonia, NIRCam is the instrument to use. #Exoplanets5
Welbanks: retrieved abundances of methane and CO2 disagree with chemical equilibrium simulations. Simulations reveal an envelope to core ratio consistent with Neptune not Jupiter. It is a popcorn planet! #Exoplanets5
Welbanks: Hubble reconnaissance revealed a surprising lack of methane. Low C:O ratio? Or something else? Is it a puffy Neptune or a low mass Jupiter? #Exoplanets5
Next it’s Luis Welbanks talking about finding signatures of EVERY major element reservoir and chemical disequilibrium in an exoplanet atmosphere (WASP-107b). Equilibrium temp of ~750K but very low density. How? #Exoplanets5
The last speaker of this block is Munazza Alam talking about early results from the JWST COMPASS survey - a transmission spectroscopy survey of 11 sub-Neptunes/super Earths. This is the largest GO programme awarded to date. Lots of fairly flat spectra, either high metallicity or cloudy #Exoplanets5
Heng: Kepler photometric phase curves often indicate planets are not homogeneous reflectors. Inhomogeneous reflectors are hard to explain without invoking some cloud. Multiwavelength phase curves (optical photometry) and multiphase spectra (IR) both useful. #Exoplanets5
Next we are hearing from Kevin Heng on reflected light observations of exoplanets and what it can tell us, specifically about cloud. He starts off by saying reflected light photometry is more informative than spectroscopy (unsure if reflected light spectroscopy included in this) #Exoplanets5
Broome: lots of things can make a difference to escape/outflow modelling, including the wind launch radius, multispectral stellar irradiation, adding x-rays and inclusion of metals. Adding x-rays without metals doesn't make too much difference, but with both it becomes important. #Exoplanets5
Next we are hearing from Madelyn Broome, on an open-source 1D photoevaporation model including x-rays and metals. Three regimes of escape: boil-off, core-powered mass loss, and photoionization-driven mass loss. Photoionization mass loss results in a tail of outflowing ionised gas. #Exoplanets5
Next we are hearing from Elsa Ducrot on eclipse and phase curve measurements of TRAPPIST-1b, including a DOUBLE phase curve of b and c! I think most of this will be in preliminary, do not skeet territory but 👀 #Exoplanets5
Kesseli: observations don’t back up the magnetic drag option - look for other scenarios that work such as asynchronous rotation #Exoplanets5
Last talk of this block is by Aurora Kesselli on CRIRES+ observations of CoRoT-2b, a planet with a surprising westward hotspot offset. GCMs indicate magnetic drag could be responsible for this, and if this is responsible should see redshift pre-eclipse and a blueshift post-eclipse. #Exoplanets5
Today's out-of-context quote from #exoplanets5:
“There were people in the working group doing really strange things, like cosmology.” - Enric Palle 🔭
Next we are hearing from Michael Zhang about escaping helium from young mini Neptune TOI-560b. This has been observed on some older mini Neptunes too. What about super Earths in the radius valley? Pair of planets TOI863b and c are a super Earth and mini Neptune. Escape seen on c not b. #Exoplanets5
Next is Romain Allart talking about the Near Infrared Planet Searcher (NIRPS) instrument at La Silla. It can operate simultaneously with HARPS and also can be used with the Helios solar telescope in daylight hours. Aim is to detect exoplanets around M dwarfs and young/active stars. #Exoplanets5
