> Based on the photometry and orbital properties, the planet candidate could have a temperature of 225 K, a radius of ≈1-1.1 RJup and a mass between 90-150 MEarth, consistent with RV limits.
Hope it has some interesting moons.
UI_at_80x24 · 4h ago
225K = -48C
So not exactly cozy. I'm not sure what the other measurements mean.
andrewflnr · 3h ago
What are the numbers for the temperature Earth would have without any greenhouse gases? The right atmosphere might make it work.
dvh · 1h ago
-19°C
jaredhallen · 4h ago
I don't either, but if its radius is the size of Jupiter, I imagine the gravity's a real buzz kill.
alanbernstein · 3h ago
For that range of mass values, the surface gravity would be relatively close to that of earth, even lower at 90x.
fc417fc802 · 1h ago
Is it Jupiter that's unusually dense or this planet that's unusually light? Related, any idea what the feasible range of densities is for a planet of a given size? I always assumed something as large as Jupiter would be impossible for a human to set foot on due to being crushed.
A ball of foamed rock the size of a planet is an amusing thought but I have to assume that's physically impossible.
ch4s3 · 4h ago
RJup is the radius of Jupiter. 1 MEarth is equal to one million times the mass of the Earth. I’m not sure about RV limits.
mkl · 3h ago
1 MEarth is 1 Earth mass. Even our sun is only a third of a million Earth masses. Jupiter is about 318 Earth masses.
samplatt · 2h ago
...so it's got a mass 3x that of our sun, but it's the size of Jupiter? And it's a planet? ...What? The star it orbits is about the same size as our sun, yet a planet orbits it with 3x the mass? I'm missing something massive here, or the summary is terrible.
Teever · 2h ago
The M in this context stands for "Mass" not "Mega."
If you take a look at the linked PDF you'll see that the "Earth" portion of that term is a subscript, so it reads "90-150 Earth masses."
JumpCrisscross · 4h ago
> not sure about RV limits
Radial velocity, how quickly a planet moves “back and forth towards an observer” as it revolved about its star [1]. Its amplitude suggests planetary mass, its spectral shape orbital eccentricity.
Hope it has some interesting moons.
So not exactly cozy. I'm not sure what the other measurements mean.
A ball of foamed rock the size of a planet is an amusing thought but I have to assume that's physically impossible.
If you take a look at the linked PDF you'll see that the "Earth" portion of that term is a subscript, so it reads "90-150 Earth masses."
Radial velocity, how quickly a planet moves “back and forth towards an observer” as it revolved about its star [1]. Its amplitude suggests planetary mass, its spectral shape orbital eccentricity.
[1] https://arxiv.org/pdf/2308.00701
https://www.planetary.org/articles/color-shifting-stars-the-...
Unfortunately that "surface" is gaseous…
… or it has a massive shell that is hollow inside /s.
Do any of the other measurements suggest anything about the nature of the surface?