bibianaprinoth, 2 months ago

To complete the sample of hot Jupiters from the 40 known ones from Kepler and a survey of the known ones from the ground + all that is missing, they used TESS data — but also this required a lot of help from others to be able to exclude false-positives.

Here we go! With all the efforts, we have a nearly complete sample. Let’s do #demographics ✨ #ExSSV

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bibianaprinoth, 2 months ago

The initial thought “three day” pile-up turns out to be more of a four-day pile up instead 🤯

For a planet to survive so close to the star, it needs to be roughly 2 Roche radii away from the star.
Anyways, the pile up is further out.

Onto metallicity: in comparison to previous work the slope for metallicity connection is shallower, following the general gas giant trend. #ExSSV

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bibianaprinoth, 2 months ago

Onto age: occurrence rate seems to be decreasing with age.

With the complete sample, they confirm this claim. Hot Jupiters seem to be found around younger stars.

In conclusion: this is just the start! ✨#ExSSV

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bibianaprinoth, 2 months ago

Next up, we’ve got Ashley Chontos with plenty of TESS planets for us. We’ll start with some look at our population:

The majority of exoplanets orbit main sequence stars.

There is growing evidence that planets are able to withstand extreme environments towards the end of the stellar life.

To say something about the population, we need densities!
#ExSSV

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bibianaprinoth, 2 months ago

TESS-Keck observations help populate the diagram and that’s what Ashley shows us here.

They homogeneously analysed the TESS transits + Keck RVs for 21 systems: among which are also some multi-planet systems with hot Jupiters 🔥

The main goal: a comparison between MS and evolved host stars. #ExSSV

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bibianaprinoth, 2 months ago

Hot Jupiters orbiting evolved sub-giant stars:

There are some clusterings.

• Lonely HJ close in around hot young stars
• outer companions on longer periods around cooler stars (interestingly also on more eccentric orbits?)
• and maybe a third?

#ExSSV

bibianaprinoth, 2 months ago

We continue with David Ehrenreich on the v² Lupi system: a tale of three sub-Neptunian worlds in the evaporation valley.

Close-in sub-Neptune planets experience mass loss, also young ones and it could be the reason for the observed radius value. So there is a high interest in studying cooler longer period sub-Neptunes.

This leads to the synergy of CHEOPS and TESS 🙌🏻 #TESS finds, #CHEOPS follows up. #ExSSV

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