> 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.
ch4s3•3h 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.
JumpCrisscross•3h 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.
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•1h 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•1h 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."
jaredhallen•3h ago
I don't either, but if its radius is the size of Jupiter, I imagine the gravity's a real buzz kill.
alanbernstein•2h 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.
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
axblount•27m ago
I was curious about the acceleration due to gravity at the surface:
Qem•4h ago
Hope it has some interesting moons.
UI_at_80x24•4h ago
So not exactly cozy. I'm not sure what the other measurements mean.
ch4s3•3h ago
JumpCrisscross•3h ago
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
floxy•3h ago
https://www.planetary.org/articles/color-shifting-stars-the-...
mkl•3h ago
samplatt•1h ago
Teever•1h ago
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."
jaredhallen•3h ago
alanbernstein•2h ago
fc417fc802•1h ago
A ball of foamed rock the size of a planet is an amusing thought but I have to assume that's physically impossible.
andrewflnr•3h ago
dvh•1h ago