Questions tagged [exoplanet]

Questions regarding planets that lie outside the Solar System.

Filter by
Sorted by
Tagged with
0
votes
1answer
37 views

Star revolving a star [duplicate]

Are there any star system(planet system) where a star revolves around a star? Is it theoretically possible?
22
votes
2answers
981 views

Terrestrial Exoplanet Skies – I've Built a Visual Sky Chart. Is it Accurate?

I'm an artist (and science enthusiast) and I've been trying to find a comprehensive resource that would help me clearly identify likely sky colors (as perceived by human vision) for exoplanets that ...
2
votes
0answers
122 views

Just how “locked” are resonant-chains of exoplanets thought to be?

update: The BBC News article Citizen science bags five-planet haul announces the system K2-138, also described as a "resonant chain" of planets. However, see the actual paper in ArXiv and Ast. J. ...
3
votes
2answers
94 views

Can we measure comets in a similar way to exoplanets?

A 2km comet at 40AU's can dim a sun sized star at 100 light years by 3%, and a 10km comet can cause an eclipse (is that right?) So would 2,3,10 km objects be easy to measure via star dimming if we had ...
5
votes
1answer
190 views

Studies on planets without parent star

I am interested in studies and/or publications about planets that wander in space and are not orbiting around a star or its remnants. These dark and frozen worlds should've got ripped away from their ...
3
votes
2answers
124 views

what would a captured planet do if it was in a retrograde orbit?

If our solar system some how captured a rogue planet, and it orbited the sun in the opposite direction to all the other planets, what major affect would it have on the stability, would its drag cause ...
2
votes
2answers
473 views

Is there any planet out there which is half gaseous and half rocky ? is this possible?

I have heard many times that this planet is gaseous like jupiter this planet is like super earth like rocky planet etc. so is there any planet which is mix of gase and rock ?
3
votes
1answer
282 views

What keeps Chthonian planets so dense?

The cores of gas giants are kept under incredible pressure by the weight of the gasses of the giant. In a chthonian planet, said gases are stripped away, revealing the core of the gas giant, which ...
4
votes
1answer
738 views

A “tidally locked” double planet?

First, I'd like to take the definition of a "double-planet" as two bodies orbiting each other where the center of gravity is not inside the larger body. Also, the system would have to fill other ...
2
votes
0answers
178 views

Can I find exoplanets without a telescope?

I would like to know please whether or not I can look for exoplanets without a telescope.
1
vote
1answer
242 views

Why does exoplanets' naming start from “b” and not from “a”? [duplicate]

An exoplanet named after its host star receives the suffix letter "b" if it was the first planet discovered to orbit that star, or "c" if it was the second, or "d" if it was the third, and so on. Why ...
2
votes
1answer
89 views

TRAPPIST 1 and planet statistics?

From what I understand, the TRAPPIST 1 system was discovered using the transiting method looking at 20 ultra-cool small stars. I'm not sure how many have been observed since this study. What I wonder ...
2
votes
1answer
50 views

Predicting/simulating magnetospheres of exoplanets?

Based on atmospheric parameters, size, or distance from the star, is there any way to simulate or predict the magnetosphere of an exoplanet? Are there programs (similar to climate models for ...
3
votes
1answer
204 views

Isn't it likely that most extra solar planets don't transit their star in line with the Earth?

In which case, for every planet that we detect, there should be significantly more that we can't detect because they don't transit in line with the Earth and, thus, are invisible. Now, I suppose that ...
1
vote
1answer
79 views

Could we see planets around active Stellar Mass Blak Hole?

This question is a followup of Is there any theoretical or empirical research about planetary systems with a black hole in their center?; Since it is possible to detect planets around stars with the ...
5
votes
2answers
607 views

How was the first exoplanet detected?

How was the first exoplanet discovered? What method was used to detect it?
4
votes
1answer
113 views

Do we have to take gravitational lensing into consideration when measuring the size of exoplanets?

For the method of waiting for a planet to pass in front of a star. rather than just measuring the light that is blocked do we also have to take into consideration the light that may not be coming to ...
5
votes
1answer
313 views

Helium in terrestrial planet atmospheres?

When you look at effective temperature ranges and escape velocities of planets, there is a "population" where hydrogen escapes, but helium doesn't. Is it feasible that there may be planets less that ...
2
votes
2answers
88 views

Detection of exo-planets

One method used for detecting exo-planets is to look for a slight dip in the parent star's luminosity as the planet transits the stellar disc. Intuitively, it seems to me that if planetary systems in ...
0
votes
1answer
394 views

What is the maximum planet mass for human habitation? [closed]

What is the maximum planet mass for human habitation? How many Gs can humans withstand on a constant basis?
4
votes
1answer
156 views

Luminosity value to use for the calculation of the habitable zone?

I'm currently studying the star system of Gliese 570 and I´m trying to calculate the habitable zone of the component A from the luminosity value in relation of the Sun´s. I´ve read that the needed ...
1
vote
0answers
82 views

Where can I find detail on interpreting the exo-planet transit-data graphics used in the Zooniverse Project?

I'm participating in the Zooniverse Exoplanet-explorers project (transit method), which provides only minimal guidance on interpreting their light curve and transit data graphics, as visible here: ...
1
vote
1answer
580 views

What elements and compounds would be present in a red gas giant?

What would give a gas giant a red color (dark or light)?
3
votes
1answer
118 views

What's the influence of a tilted orbital plane, when observing an exoplanet transit?

I made an illustration to explain what i mean : If we assume we have two similar planet/star systems (similars in size/mass/period..) but tilted differently relative to us. How can we predict that ...
1
vote
2answers
134 views

Are exoplanets at dwarf stars less likely to have super-rotating atmospheres or asynchronous tidal locking?

Dwarf stars have terrestrial sized planets orbiting in habitable zones very close to them. These exoplanets are often said to be tidally locked to their star, like the Moon is to Earth, and that they ...
5
votes
3answers
776 views

Are the planets Trappist-1 in the solar system?

I'm an Astronomy noob, but I'm interested in learning how stars and planets work. Everything started with the Trappist-1. I read about it, and it's fascinating. However, it's impossible for me to ...
3
votes
2answers
254 views

Exoplanet hunters ignored or ridiculed in the 1980s or 1990s?

I recently came across this youtube video, in which a few people are singing about the history of exoplanet discovery. It suggests that, in the 1990s, exoplanet hunters were largely ignored or ...
2
votes
0answers
49 views

What would the tides on the Trappist-1 planets be like? [duplicate]

In the recent press conference about the planets orbiting around Trappist-1, one of the astronomers mentioned that the planets are close enough to each other that the tidal forces between planets are ...
4
votes
1answer
251 views

If thousands of exoplanets have been discovered, why haven't we discovered planet 9 yet? [duplicate]

According to NASA, we've discovered 3,453 exoplanets so far [1]. With some of the farthest being at 13,000 light years away [2]. This would suggest today scientists have a really advanced capability ...
4
votes
1answer
137 views

Trappist-1 planet albedo

Is the albedo of any of the Trappist-1 planets know? Is it high enough so if you are on the surface of one of the planets, you can see the others? I looked up the distances from the star and size of ...
9
votes
1answer
275 views

How long have the TRAPPIST-1 planets been in a habitable zone?

The planets orbiting TRAPPIST-1 are in orbits around their star much closer than Earth orbits Sol. However, since TRAPPIST-1 is a cool brown dwarf, some of the planets are in an "inhabitable zone", ...
4
votes
1answer
123 views

How do we know the order of the new Trappist-1 planets?

Using transit photometry astronomers were able to discover Trappist b through h. Based on this question we learn that the naming of planets is based on their distance from their star (b being the ...
3
votes
2answers
190 views

Are there any planned future observations of TRAPPIST-1 and its planets?

The recent discovery of new planets around the star TRAPPIST-1 happened by observations from 7 ground-based telescopes, as well as the Spitzer Space Telescope. The team of astronomers responsible has ...
5
votes
1answer
891 views

Can we detect exoplanets with perpendicular plane of ecliptic?

If I understand correctly, all the current exoplanet search is based on planets transitioning the distant star. If the plane of ecliptic of that star happens to be perpendicular to line of sight from ...
21
votes
5answers
5k views

How was Trappist-1 discovered?

I was going through all the questions in this community related to TRAPPIST-1 in order to know how planets TRAPPIST-1b to TRAPPIST-1h were discovered, but there aren't any. How were they discovered?
19
votes
2answers
2k views

Is there a gas giant orbiting TRAPPIST-1?

I would like to know if besides these planets, astronomers have discovered a gas planet like Jupiter in this system and if on these planets could exist life without a comet protector like Jupiter does ...
2
votes
1answer
865 views

Exo Planets and Planets difference?

After hearing that it has been confirmed that we found seven similar exoplanets like earth. I thought exoplanets were dead stars. After doing a little bit of research I found out that exoplanets are ...
54
votes
3answers
7k views

Where did TRAPPIST-1a go?

According to the NASA announcement and the Wikipedia article on TRAPPIST-1, the planets around the TRAPPIST-1 star are named TRAPPIST-1 b through h. What happened to "TRAPPIST-1 a"?
7
votes
1answer
236 views

How close can planets form to one another?

With the NASA announcement today regarding the discovery of a system containing seven earth-sized planets (3 within the habitable zone), I wondered about the seemingly crowded conditions. What ...
1
vote
1answer
81 views

Transit Depth Color Versus Transmission Spectroscopy

One of the tools being developed for the study of exoplanets is called transmission spectroscopy - basically looking at how passing through the exoplanet's atmosphere changes the spectrum of the star. ...
9
votes
1answer
212 views

Was the discovery of six exoplanets around one star as “easy” as counting six peaks in the FT?

The phys.org article Scientists make huge dataset of nearby stars available to public describes the release of a publicly accessible database of Echelle radial velocity measurements; The LCES HIRES/...
-1
votes
1answer
117 views

What IS HD 106906b?

Until recently, it was thought that should the size of Jupiter exceed 86,881.4 miles in diameter or the mass 318 times greater than Earth's, it would become a dwarf star, not a planet. WASP-17b is ...
19
votes
6answers
7k views

What does forward modeling mean?

In my research on exoplanets, I have heard many people talk "forward modeling of exoplanet atmospheres". I don't know what the "forward" means in "forward modeling" and how it compares with "reverse ...
2
votes
1answer
393 views

Exoplanet rotation period

Is there any way through which we could determine the ROTATION period of an exoplanet based on the data we observed?(from transit)
-5
votes
1answer
233 views

can a life exist outside the universe? [closed]

can a life exist outside of universe. but we know that in our universe many galaxies have life without water and oxygen and it is possible that life exist outside the universe so help me to find the ...
5
votes
1answer
241 views

Which stars, identifiable with the naked eye, have exoplanets?

If I look at the night sky, which easily identifiable stars have known exoplanets, and what are the names of those planets? With the recent discovery of so many exoplanets, it is a nice idea to look ...
2
votes
4answers
101 views

Is TESS replaceable by gound-based-small-telescope arrays?

TESS is designed to perform an all-sky transiting exoplanet survey. TESS's survey will focus on nearby G, K and M type stars with apparent magnitudes brighter than magnitude 12. Approximately 500,...
4
votes
1answer
74 views

Is it possible to tell if a certain extrasolar planet produces its own magnetic field?

I know by observing the dimness of a star it is possible to calculate an exoplanet's distance from the star and its mass by how much the star wobbles. However, is there any way to accurately determine ...
3
votes
2answers
201 views

How is the mass and semimajor axis of a directly imaged exoplanet found?

I can't find information on this for the life of me. How do astronomers approximate the mass and semimajor axis of a directly imaged exoplanet? Would several photos need to be taken to find the ...
3
votes
1answer
360 views

Why don't we use amateur astronomers' telescopes to create a huge interferometer?

Some telescopes in space have been proposed to function as an interferometer. Being placed several hundreds or thousands of kilometers apart they could actual image exoplanets directly. To my ...

1 2 3
4
5
7