Questions tagged [exoplanet]

Questions regarding planets that lie outside the Solar System.

Filter by
Sorted by
Tagged with
1
vote
1answer
116 views

What is a stellar component?

I have a question where I have to calculate the orbital inclination of a planet, so that it isn't a exoplanet but a stellar component. The mass of the star it is orbiting is 1.1 $M_☉$. Does the ...
-1
votes
1answer
81 views

What is the gaseous-to-rocky ratio of exoplanets?

Around the Sun, there are as many gaseous planets (Jupiter, Saturn, Uranus and Neptune) as there are rocky planets (Mercury, Venus, Earth and Mars). Do other stars have similar gaseous-to-rocky ...
7
votes
1answer
267 views

Is there a clear-cut difference between rocky and gaseous planets?

A gas giant planet is large enough that it retains a lot of hydrogen and helium. A rocky planet is one with a solid surface. That's the rule of thumb to distinguish between the rocky and gaseous ...
2
votes
2answers
369 views

What planets or exoplanets orbit the Sun’s elder twin HIP 102152?

Has anyone done any research on the planets that orbit the HIP102152? Since that star is similar to ours and older, I postulate that it’s likely those planets are most worthwhile searching for ...
0
votes
1answer
41 views

Is it only possible to look at solar systems with stars at least as old as ours to be able to find intelligent life?

Assuming the speed it takes to development intelligent life is the same in all solar systems, would we need to look at exoplanets with stars as old or older than ours to find intelligent life? A young ...
4
votes
1answer
113 views

Have any planetary systems been found around Population II stars?

I always understood that Population II stars were unlikely to have planets as they were virtually all H and He with very little else. Have recent observations confirmed this, or have planets been ...
1
vote
1answer
87 views

Code/Package for multiple planet simulation

I want to do a quick study and some tests on the planet-star dynamics ( including the movement of the star). I'm looking for a code that simulates some planets orbiting a star. I've tried searching ...
12
votes
3answers
4k views

Are there any planets or moons denser than Earth?

Earth has the highest density out of all planets, planetoids and moons of our planetary system, and also has a higher density than the Sun. Do we know any exoplanets or moons denser than Earth?
4
votes
1answer
67 views

How can a Grade-11 Student avail TESS data and learn to process?

As mentioned, I am a Grade-11 student. I have always been interested in Data Processing activities. This sums up my experience of working on Asteroid hunt Campaign under IASC (International Asteroid ...
4
votes
2answers
84 views

Time vs magnification in a binary lens

For a single lens: we got \begin{equation} u(t)=\sqrt{\left(\frac{t-t_0}{t_E}\right)^2 + u_0^2},\end{equation} so the magnification is \begin{equation} A = \frac{u^2+2}{u\sqrt{u^2+4}} \end{...
2
votes
1answer
111 views

Would exoplanets like those of Kepler-70 possess magnetic fields?

The B-type subdwarf, Kepler-70 (aka KIC 5807616) is believed to have two planets orbiting it, at average distances 0.006 AU and 0.0076 AU (source). Due to their proximity to their parent star, they ...
3
votes
2answers
145 views

Consequences of strong wind on an alien Planet on the possibility of life

I was surprised to learn recently that Neptune has winds of 1500 miles an hour. My question is whether life could ever evolve on such a Planet that has such powerful winds? Not necessarily on ...
1
vote
1answer
122 views

Why pulsar pulses are so extremely regular?

It's often said that the pulses of the pulsar have a very precise period, which helps to detect easily exoplanets that cause fluctuations in the time of arrival (TOA) of the pulses. Anybody knows why?
0
votes
2answers
90 views

Could the mineral composition of planets explain the absence of megastructures?

The Fermi paradox concerns why we don't observe evidence of alien life, such as megastructures. If we were to build a Dyson swarm, the best source material may be Mercury (Armstrong and Sandberg 2013):...
2
votes
1answer
74 views

Derivation of the orbital parameters of a exoplanet discovered by direct imaging

I wonder which orbital elements of a exoplanet can be found only applying direct imaging. I know that the angular separation combined with parallax can give us the semi-major axis, but what about the ...
1
vote
1answer
75 views

Could a gas giant orbit a star with a 30 year period at a distance of just 1 AU?

Assuming a star with similar properties to our sun, could a gas giant orbit it with an orbital period similar to that of Saturn, but, at a much closer orbital distance, more similar to 1 AU?
4
votes
1answer
81 views

What is this gap between hot and cold Jupiters?

When plotting mass to semi major axis on exoplanets.org, there seems to be a gap between Hot Jupiters and Cold Jupiters. A lot of Jupiter-mass planets at less than 0.1 AU have been discovered, and a ...
25
votes
2answers
8k views

Is Jupiter still an anomaly?

I remember a few years ago hearing that Jupiter was an anomaly in the landscape of exoplanets. Back then, most Jupiter-mass planets discovered were Hot Jupiters, orbiting very close to their host star....
4
votes
2answers
152 views

How many exoplanets have been found around binary stars?

This XKCD whatif talks about circumbinary and [the other kind of] exoplanets. How many such exoplanets have actually been discovered? I tried to look it up at exoplanets.org, but didn't find a column ...
2
votes
0answers
46 views

Is it possible to build a ground-based telescope that can directly image Earth-like planets orbiting in the habitable zone of sunlike stars?

In the following discussion I will refer to Earth-like exoplanets planets orbiting in the habitable zone of sunlike stars simply as “Earth-like exoplanets." NASA is currently developing or ...
2
votes
1answer
74 views

What is the least dense exoplanet?

An exoplanet with density 0.31 grams per cubic centimeter has been found. Is this the least dense exoplanet we know of?
0
votes
1answer
3k views

Troop of moving stars through a straight line [duplicate]

Last night,I and my brother suddenly saw that some(50-60) dots of light( exactly like stars) were moving through a straight line(from NW to SE) above us with same velocity and towards exactly same ...
0
votes
0answers
28 views

Why does the transit method work so well for planet hunting? [duplicate]

This may seem like a duplicate of A few questions regarding the transit of planets and Orbital plane evolution and planet discovery via transit method, but... How is it that we've been able to ...
5
votes
0answers
152 views

Can primordial black holes be found orbiting other stars?

A recent study suggests a that a primordial black hole may be orbiting the sun at and that they can be common near other star systems. What measurements and equipment can perhaps find BH's near ...
5
votes
1answer
37 views

Are warm circumstellar debris disks still able to be detected at sub-millimeter wavelengths?

At these wavelengths a survey is more sensitive to detecting relatively cool disks (T<100k), but would a telescope operating in the sub-millimeter be less sensitive to warm debris disk than say, a ...
1
vote
1answer
147 views

Given that Kepler's Third Law as stated on most websites doesn't include mass, how does it work for planets in other star systems? [duplicate]

Kepler's Third Law as stated on websites I found while searching for "how to convert between a planet's orbital period and semi major axis" is $P^2 = A^3$ where P is the orbital period in years and A ...
3
votes
1answer
65 views

Exoplanets, Protoplanets, and planetesimals

So, most of the mass of the solar system (that isn't inside the sun) is inside Jupiter. And most of whats left after THAT is inside Saturn. So, all the rocky planets, moons, and asteroids in our solar ...
4
votes
2answers
198 views

Can we calculate the orbit of exoplanets?

I'm not an astronomer, but the question came up and I'm interested if we are able (or how accurate we are able) to calculate the orbital parameters of an exoplanet. Since the transit method must yield ...
6
votes
3answers
270 views

Can we see evidence of sunspots on other stars

Searching for exoplanets by measuring the change of a stars brightness when an exoplanet transits the star's disk also has the potential to detect exo-sunspots. Have they ever been detected?
4
votes
1answer
118 views

Would two Earth-like planets on opposite sides of a Sol-like star at about 1 AU be a stable configuration?

Would two Earth-like planets on opposite sides of a Sol-like star at about 1 AU be a relatively stable configuration? I understand that there are tadpole-like orbits and the two planets may not stay ...
2
votes
1answer
104 views

By convention, when observing an exoplanet, is the observer's line of sight (on Earth) perpendicular to the plane of sky?

This is just a quick question. In this picture of the orbit of an exoplanet, is the observer's line of sight perpendicular to the plane of reference, which is in the +z direction on the diagram? In ...
2
votes
0answers
39 views

Would the WISE Survey pick up a large planetary collisions like Theia-Earth? And from how far?

WISE or Wide-Field Infrared Survey Explorer Large body collisions are obviously, very very rare, locally speaking, and with stars, often spiraling inwards not direct collisions. I know that stellar ...
1
vote
1answer
124 views

Are gas giants actually rare?

Kepler data suggests that the vast majority of planets are smaller than 4 Earth radii, with larger planets quickly becoming vanishingly scarce. Yet somehow, our own solar system harbours not just one, ...
0
votes
1answer
125 views

Are the planets in the TRAPPIST-1 system so close that inhabitants on one planet could see surface details on the other planets?

In a discussion below the Space Exploration question Are there any to-scale diagrams of the TRAPPIST-1 system I was invited to ask a question like this, so I have. Question: Are the planets in the ...
2
votes
1answer
96 views

What is the relative velocity between planets in different solar systems?

Is it possible to estimate what the difference in velocity is between the earth and another convenient exoplanet? Or perhaps just our star and a near neighbour? I'd be curious where I could find the ...
2
votes
1answer
100 views

Why would a tidally-locked rocky planet have a first-order spherical harmonic surface temperature distribution?

The new Letter to Nature Absence of a thick atmosphere on the terrestrial exoplanet LHS 3844b (also ArXiv) analyzes the thermal infrared light curve from the system (about 4.5 to 5.5 um). The planet ...
1
vote
1answer
216 views

View of other planets from the Earth

There appears to be varying positions/spots of view of other planets from Earth, if I'm not wrong. Now, given that all planets are on the same plane, why do their positions change on the night sky for ...
1
vote
4answers
365 views

Why are there no photos of exoplanets?

There are a lot of photos of diffrent astronomial objects such as galaxies, nebulae and stars of which some are very far away. However there are no real photos of exoplanets (by “real photos” I mean ...
1
vote
1answer
35 views

Any plans for TESS after it finishes northern sky survey?

TESS has provided the astronomy community with a treasure trove of information. Once TESS completes its one year survey of the northern sky, are there any plans for an extended mission? Just seems ...
8
votes
1answer
551 views

How would water-ammonia oceans behave?

Scientists strongly suspect that several moons in our solar system have frozen-over oceans of water-ammonia mixture. I've also read speculations on the possibility of surface water-ammonia oceans on ...
2
votes
0answers
49 views

Could an Applegate-like mechanism operate in AM CVn systems?

One of the controversies surrounding the detection of exoplanets around post-common envelope binaries is the possibility that the orbital period variations observed might be the result of the ...
3
votes
1answer
76 views

periodic inclination change circumbinary planet

I am studying circumbinary planets and I made a python model to calculate certain properties of the orbits, and when I calculate the inclination I get a sine wave. I do not see a way to predict the ...
0
votes
1answer
55 views

Plot SuperWasp Lightcurves

I am trying to plot superwasp lightcurves in python from the fits files, using TMID and FLUX2, getting this: There is a way to transform the information so I can plot the lightcurves with the kepler ...
0
votes
0answers
96 views

How Reliable is Bode's Law?

Is Bode's Law just a series of remarkable coincidences,or would it hold good for other solar systems where the star is similar to our sun?
10
votes
1answer
125 views

How actively is Deep Learning being used in exoplanet identification?

Papers, like this one from Google, show that Deep Learning and Machine Learning are effective in detecting exoplanets from luminosity data provided by telescopes like TESS or Kepler. These models ...
1
vote
0answers
50 views

What maintains the high orbital eccentricity of many exo-planets near their sun?

Over the last decade we've discovered that many exoplanets not only have highly eccentric orbits, but also orbit very close to their sun. This is true of many classes of stars. I definitely have a ...
0
votes
2answers
149 views

Are exoplanets which are above escape velocity of particular interest?

I was perusing the exoplanet database and looking for some of the more extreme orbits, when I happened upon HD 20782 B: http://exoplanets.org/detail/HD_20782_b Which is also listed (in two sentences)...
2
votes
1answer
118 views

Could an Earth-like magnetic field protect life at exoplanet Proxima Centauri b?

I took a look at Wikipedia's page for Proxima Centauri b, the exoplanet that orbits Proxima Centauri, where it is said it is expected to receive 2000 times of stellar wind pressures than on Earth. It ...
2
votes
4answers
127 views

Is it plausible for a planet that is positioned in the habitable area of a solar system to have little extractable metals?

I am big fan of Asimov's Foundation and I am wondering about the plausibility of some of Foundation's imagined words. According to this article Terminus was a special world with little metals: It ...
4
votes
1answer
97 views

Why does the number of extrasolar planets vary in different sources?

There are at least three catalogues that are counting up-to-date discovered exoplanets. What criteria do they use to count the number of planets? Every catalogue has a different count value. So at ...

1
2
3 4 5
7