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Questions tagged [exoplanet]

Questions regarding planets that lie outside the Solar System.

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Could a planet or its moon be synchronously tidally locked with the sun, but still in orbit with its moon/planet?

Obviously, with so many stars and presumable planets, lots of things can happen for a short time, but I'm wondering if there is a stable configuration for either twin planets or a planet with a ...
user121330's user avatar
2 votes
1 answer
39 views

How to estimate perturbations from other planets in Apsidal Precession

I am developing a fictional system which I want to calculate to as much detail as I can. Thus I have a question about astrophysics and astrophysical formulae. I know that Apsidal Precession is ...
DanceroftheStars's user avatar
5 votes
1 answer
437 views

What will it take to start measuring the rotation rate and direction of exoplanets? Which instrument(s) current or future are most likely to do it?

@ProfRob's answer to Is it coincidence that the earth's rotation and revolution are in the same direction? explains several important aspects of models for planetary formation, angular momentum and ...
uhoh's user avatar
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1 vote
0 answers
21 views

How to determine semiamplitude from Julian Date data?

How could I determine semiamplitude from these data for NGC300 X-1 without fitting, only with data of phase and JD? This is a common problem for exoplanets, X-ray binaries and other general binary ...
riemannium's user avatar
2 votes
0 answers
88 views

Atmosphere colour from orbit

I know a few different resources for determining the colour of a world's sky depending on its star and atmospheric pressure, but I haven't been able to find anything for how it would look from space (...
Kazon's user avatar
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3 votes
1 answer
157 views

Is it possible to determine orbit orientation of exoplanet without direct imaging and astrometry?

Is it possible to determine orbit orientation (in space) of an exoplanet without direct imaging or astrometry (for example with transits and rv observations only)? I have read somewhere that orbits ...
Leos Ondra's user avatar
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4 votes
1 answer
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Warped rings of extrasolar planets or "warm Saturns"

I read a little bit about extrasolar gas giants and planets with rings, and stumbled upon the paper "Warm Saturns: On The Nature Of Rings Around Extrasolar Planets That Reside Inside The Ice Line&...
SaintDiabolus's user avatar
3 votes
1 answer
86 views

About the formation of ice giants and gas giants

I asked this previously in Worldbuilding stack exchange, and they recommended that I take it here. How far out from a star (lets just say one identical to our sun, for simplicities sake) where can gas ...
DanceroftheStars's user avatar
4 votes
0 answers
144 views

Just how resonant is the "resonant sextuplet of sub-Neptunes transiting the bright star HD 110067"?

The November 29, 2023 arXiv preprint A resonant sextuplet of sub-Neptunes transiting the bright star HD 110067 constructs a resonant chain of orbital periods based on mean motion resonances (MMRs) and ...
uhoh's user avatar
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3 votes
2 answers
95 views

Size of the solar system relative to exosystems

How does the semi-major axis of Mercury's orbit compare to that of the innermost planet of other exosystems? What about the semi-major of Neptune compared to that of the outmost planet of a system? I'...
Krish Desai's user avatar
0 votes
0 answers
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Solar system datasets for exoplanet analogs?

Are there data from the solar system available, that are about quantities we regularly investigate in exoplanet searches? The only collection I know of comes from this paper: "A Catalog of ...
Helen's user avatar
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2 votes
1 answer
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Is an earth-sized moon orbiting a super-earth feasible?

Is an earth-sized moon orbiting a super-earth feasible? Or would tidal forces say 'no thanks'? I'm making a system for the Kerbal Space Program Kopernicus mod and am trying to make it as realistic as ...
spaceman0x2A's user avatar
12 votes
1 answer
3k views

Are there plans to detect life on Earth from the outer solar system?

This has been kicking around in my head for a while. We've been detecting planets for decades by observing regular dips in starlight from many light years away as a planet transits its host star. I've ...
Greg Burghardt's user avatar
0 votes
1 answer
41 views

Determining Stellar Activity

I've been into exoplanets and the search for life for a few years now, but I'm still very much an amateur. The basics are fairly easy: habitable zone adjusted for planet/moon mass, no brown dwarves (...
Kazon's user avatar
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1 vote
0 answers
53 views

Question regarding potential moon sizes

I am planning out ideas for a science-fiction world, and I want to make sure that what I include is reasonable and mathematically sound (outside of things like FTL as that is neccessary for the story ...
DanceroftheStars's user avatar
3 votes
2 answers
110 views

Could a super Jovian planet have mild radiation belts?

Will a large gas giant always have powerful radiation belts or could a milder radiation environment exist even around super Jovian planets? I know Jupiter’s radiation belts are so strong due to a ...
Elhammo's user avatar
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2 votes
1 answer
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Help with simulating long-term orbital dynamics of exoplanetary systems using Rebound

I am a junior in high school working on an independent research project and I need help because I've reached the limits of my knowledge. My goal is to simulate the long-term orbital dynamics of ...
HSStudent's user avatar
1 vote
0 answers
191 views

How common are there planets with significant share of oxygen in atmosphere?

Has been there detected any exoplanets with significant share of oxygen in atmosphere? What does the theory predict? Superficially this looks like it should be fairly common: there is a lot of water ...
Anixx's user avatar
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0 votes
0 answers
40 views

Looking for feedback for my python GUI: visualise exoplanet transit and simulate atmospheric temperature

This isn't necessarily an astronomy question (although there may be plenty of astronomy errors in my GUI), and I apologise in advance if this kind of thing is not allowed here and the question is to ...
Marco Leonardi's user avatar
0 votes
1 answer
118 views

If E.T. alien civilizations exist, won't those exoplanets be almost the age and rate of progress as ours? [closed]

This question is posed also as a mini theory, although I am really asking if someone knows how some parts of our universe would be far-more advanced if "everything" started at the same time (...
Dr. Deshando's user avatar
1 vote
1 answer
94 views

Looking for a Specific Planet

I know my title isn't the most specific, but the planet I am looking for is. I have been looking through many exoplanets and I can't seem to find what I am looking for, the closest I have found is ...
Amoeba's user avatar
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1 vote
2 answers
273 views

Could sky islands exist on exoplanets or moons?

Sky Islands are a popular sci-fi trope. Think the Avatar films, the Legend of Zelda Nintendo switch games and so on. Is there any configuration of exoplanets or moons that could sustain a large body ...
tomh's user avatar
  • 663
2 votes
0 answers
142 views

What have we ruled out as far as planets orbiting Gliese 710 goes?

My thoughts are that, if we are still around 1.3 million years from now, we might actually be able to send a mission there. Will the spectrometers of the 30 meter telescopes that are coming on line ...
Jack R. Woods's user avatar
2 votes
3 answers
181 views

Is there a link between a star's metallicity and the availability of chemical elements in its system?

Considering aspects of interstellar trade for worldbuilding purposes, I'm researching what resources might be available in each star system. The premise is that if one star system has an abundance of ...
Krišjānis Liepiņš's user avatar
2 votes
1 answer
63 views

Estimating the radius of a non-transiting exoplanet

I need to know the timescale of tidal locking of a non-transiting exoplanet. For that, I need to know (or at least have some constraint of) its radius (Gladman et al. 1996): $$T_{lock} = k \frac{a^6}{...
Carlos Vázquez Monzón's user avatar
1 vote
0 answers
27 views

Does Trappist-1 have a Periodic Configuration? [duplicate]

Trappist-1's planetary system is notable for having 7 planets in a resonance chain. I would think, since all the planets are in resonance, the system would have a repeating configuration that could be ...
skout's user avatar
  • 309
1 vote
0 answers
44 views

How can I find or calculate ephemeris data for the planets in an extrasolar system, specifically Trappist-1?

The ultimate, perfect answer would be a link to someone's ephemeris file in SPICE kernel format. That's not a realistic hope. Googling and gnawing, I've found orbital periods, eccentricities, and ...
An ominous cow word's user avatar
3 votes
1 answer
274 views

True masses of exoplanets from Gaia

At Wikipedia https://en.wikipedia.org/wiki/Methods_of_detecting_exoplanets#Space_telescopes it says "The Gaia mission, launched in December 2013, will use astrometry to determine the true masses ...
sno's user avatar
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-2 votes
1 answer
64 views

Can a star with a stellar mass of 1.176 with a similar composition to the Sun have a planet with these characteristics?

Imagine a solar system similar to ours that has a star with a similar composition to the Sun and a stellar mass of 1.176 and an Earthlike planet with about 1.18 times the mass of Earth in its ...
Galactic's user avatar
  • 113
0 votes
1 answer
78 views

What stellar conditions and orbital distance are needed to produce a year length of 515 Earth days and 9 Earth hours on an Earthlike planet?

A planet has a year length of 515 Earth days and 9 Earth hours. It is the same size and has the same climate as Earth. What stellar conditions would be needed to produce this and what orbital distance ...
Galactic's user avatar
  • 113
6 votes
1 answer
1k views

Is a bromine planet possible?

Is it possible to have a terrestrial, rocky, earth-sized planet (by earth-sized I mean approximately the same mass and volume as earth) which has vast quantities of bromine on its surface, in the form ...
user98816's user avatar
  • 469
2 votes
1 answer
41 views

Are we searching for supercriticality of exoplanet water via passive spectral analysis?

Much spectrum analysis on many chemical compounds are mapped and categorized at Earth atmosphere (1000 millibar) or thereabouts. But many celestial objects are of greater ranges of surface pressure. ...
John Greene's user avatar
1 vote
0 answers
74 views

What do chthonian planets look like?

Obviously, a chthonian is going to be hot, but what colours could it have? What would the surface composition be? Would it keep patterns from the gas-bands it used to have, or would those have been ...
Kazon's user avatar
  • 587
3 votes
1 answer
104 views

How accurate is the Sudarsky Scale today?

How accurate is the Sudarsky scale of gas-giant classification today? Do the different classes still exist, and look roughly the same?
Kazon's user avatar
  • 587
1 vote
2 answers
113 views

How to calculate the day/permanently dark/night temperatures of different surfaces for exoplanets?

I am trying to calculate the different temperatures (day, night, permanent day/night for tidally locked planets) for different surfaces of exoplanets like land, water, gas, ice. I am using an ...
VirtualPaul's user avatar
1 vote
1 answer
106 views

Exoplanet radius from stellar distance

Do you need to know the distance to a star to work out the radius of any planets it has?
sno's user avatar
  • 1,456
2 votes
1 answer
105 views

Finding the Phase of an Exoplanet using the ephemeries

So I'm currently researching Star-planet Interactions for HD 156279, I'm taking the flux of the Ca II H&K lines and trying to plot them against the phase of the planet, looking for evidence of ...
chris trejo's user avatar
14 votes
1 answer
2k views

Could it be possible to detect planets from stars that went supernova through the resulting nebula shape?

It ocurred me, if a star with at least one planetary companion undergoes a nova or supernova, we shoud expect the debris to be deflected to some degree, on exit. To ilustrate it, first let's take the ...
ksousa's user avatar
  • 1,171
1 vote
1 answer
187 views

What phases of a moon orbiting Proxima Centauri b could be seen?

Assuming a moon like Earth's natural satellite would be orbiting the Proxima Centauri b at a similar distance, what moon phases could be seen from the planet's surface at coordinates 0;55? Adding ...
Krišjānis Liepiņš's user avatar
3 votes
1 answer
127 views

Goldilocks Zone Temperature Range for Habitation

Is there a generally accepted Kelvin temperature range for exoplanets habitable zone. So for example, I can look at for example, http://exoplanet.eu/catalog/toi-2134_b/ and say the planet is in the ...
MiscellaneousUser's user avatar
4 votes
1 answer
143 views

Seeing exoplanets with glare

My understanding is that the main obsracle to seeing habitable planets is glare. Right now, the best solutions are coronagraphs and proposed starshade satellites which blocks the star. But is this the ...
Abdullah is not an Amalekite's user avatar
2 votes
0 answers
59 views

How is the extent of the rings of J1407b, a "Super Saturn," compatible with the Roche limit?

J1407 is a Sun-like star in Centaurus. Astronomers observed its exoplanet J1407b pass before it over several weeks and the details of the light curves indicate the exoplanet has over thirty rings, ...
WPWPWP's user avatar
  • 205
2 votes
2 answers
51 views

Temperature of a gas giant 23 AU from Fomalhaut

If a gas giant, weighing about 30 Jupiter masses, orbited the A-type star Fomalhaut at 23 AU, what would its temperature be? Would it be warm enough to have ammonia clouds like Jupiter or Saturn, or ...
user98816's user avatar
  • 469
1 vote
0 answers
49 views

Imaging an exoplanet via brightness over time

We can't directly image an exoplanet. Most of the time we detect planets by occlusion of the stars light. However, we occasionally can filter out the star's light and measure the light from the planet ...
Kevin Kostlan's user avatar
13 votes
2 answers
252 views

Why hasn't VLBI been used to try and image giant exoplanets?

A Jupiter-sized object at 10 pc subtends an angle of 0.0001 arcseconds (100 micro-arcsec) at the Earth. The Event Horizon Telescope interferometry network is capable of a (demonstrated) angular ...
ProfRob's user avatar
  • 153k
16 votes
7 answers
5k views

Is there enough data in light coming from distant exoplanets for Earth-orbiting telescopes to take a high-resolution photo of it?

NASA’s James Webb Space Telescope has taken very blurry "photos" of exoplanets around distant stars, such as the exoplanet HIP 65426 b, in different bands of infrared light: My question is, ...
user3163495's user avatar
4 votes
0 answers
100 views

What could successive double dips in the light-curve mean?

I was going through some analysis of the TESS light-curve data and I stumbled upon an interesting example (see below figures, where the blue line is simply a moving average), where the light-curve ...
Tom's user avatar
  • 141
2 votes
1 answer
63 views

Do M dwarf stars emit the wavelengths of the electromagnetic spectrum necessary for photosynthesis?

I read a lot of press as of late about earth size planets around the habitable zone of M dwarf stars. I am not an astronomer but I assume this means that the distance will allow liquid water to exist. ...
Sedumjoy's user avatar
  • 1,201
1 vote
0 answers
121 views

Can JWST see Proxima C?

I know that Proxima B is too close for Webb. But Proxima C is >1'' away from Proxima. So Webb could see it. There have been some unconfirmed images from earth. Besides there seem to be dust bands ...
alain's user avatar
  • 19
0 votes
0 answers
162 views

How common are exoplanets with no atmosphere?

I'm guessing that real data about exoplanets will be unhelpful because it's hard to detect low-mass planets, and thus answers are likely to be based on the kind of educated-guesswork that we relied on ...
Tom's user avatar
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