Questions tagged [exoplanet]

Questions regarding planets that lie outside the Solar System.

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Fractional contribution of secondary star

What do we mean by "the luminosity fraction" and "the fractional contribution of the secondary star" of binary stars? can anyone suggest any method to calculate them theoretically?...
Jiswin's user avatar
  • 177
2 votes
1 answer
150 views

When graphing radial velocity measurements, whats the relationship between days and the orbital phase

I graphed the radial velocity measurements for various planets, however, I am able to calculate the RV and the phase but whats the translation between phase and days. I want it to be days vs RV.
Oop's user avatar
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3 votes
2 answers
405 views

How to understand exactly why gravity darkening happens on rotating stars?

Phys.org's TESS delivers new insights into an ultrahot world links to KELT-9 b's Asymmetric TESS Transit Caused by Rapid Stellar Rotation and Spin–Orbit Misalignment (readable in arXiv) The assymetric ...
uhoh's user avatar
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9 votes
3 answers
2k views

Can exoplanets be found using neutrino detectors?

I read that KamLAND can detect geoneutrinos produced by thorium and uranium decay in Earth's crust. Could a larger detector detect neutrinos from other planets in the solar system or perhaps even ...
Daniel's user avatar
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13 votes
6 answers
4k views

Why there are no terrestrial planets with a subsurface ocean?

Subsurface oceans in satellites are pretty common: Europa, Enceladus, Ganymede, Callisto, maybe Pluto... This is due to tidal heating of their host planet, Jupiter and Saturn, which heats up the inner ...
Carlos Vázquez Monzón's user avatar
2 votes
1 answer
236 views

How to project an arbitrary elliptical orbit onto the night sky plane?

An ellipse E is arbitrarily oriented in 3-D space with the origin at one of its foci. Use the standard elements provided in the figure. Assume the reference direction $\gamma$ or $\gamma'$ is the ...
Arnav Das's user avatar
3 votes
1 answer
128 views

Why is there no Proxima 'a' planet? I'm confused about the naming convention [duplicate]

Why is there no exoplanet around Proxima Centauri designated with the letter 'a'? There is, famously, a 'b' and now a newly confirmed 'c'.... I have read that exoplanets around a star are designated ...
Kurt Hikes's user avatar
  • 4,891
5 votes
1 answer
241 views

Are there other planetary systems where gas giants are on the inside to rocky planet orbits?

I understand that formation theories for gas giants suggest they should be born further away where there is more gas for them to monopolize vs the sun, and then to form Hot Jupiters they need to ...
Axion's user avatar
  • 345
6 votes
2 answers
1k views

Get orbital period of exoplanet from light curve using astropy.timeseries

I am using astropy and I would like to calculate orbital period of an exoplanet by its star's light curve. I follow tutorial in astropy docs and I use data from Kepler in Nasa Exoplanet Archive. ...
Michal's user avatar
  • 313
5 votes
1 answer
511 views

Can tidally locked planets have liquid oceans on their night side, and would such a planet be habitable?

Let's say we have a tidally locked planet orbiting a star. And let's say that the conditions on its surface are just right for water to exist on its surface. Conventional wisdom says that the water on ...
Grendel-the-Hutt's user avatar
3 votes
1 answer
155 views

Pair together light curve and radial velocity data of specified star

I would like to create a web application that works with light curves and radial velocities of stars with exoplanets. I found a NASA bulk data download with both light curves and radial velocities (it'...
Michal's user avatar
  • 313
3 votes
1 answer
118 views

How many times can iron be detected for the first time in an exoplanetary atmosphere?

I see today that there's a story about the first detection of iron in an exoplanetary atmosphere, in this case in the atmosphere of the ultra-hot Jupiter KELT-9b. I remember there being a story a ...
user avatar
3 votes
1 answer
349 views

Is it possible that some of the confirmed exoplanets are in fact primordial black holes?

Recently astronomers discovered a black hole lying just 1000 light-years from Earth, in a triple star system (HR 6819) that can be seen with the naked eye. This discovery has increased the possibility ...
NeutronCat's user avatar
1 vote
1 answer
2k views

How frequently do Jupiter & Regulus have triple conjunctions?

I am wanting to know if the triple conjunction of Jupiter with Regulus in: Sep 10, 3 BC Feb 7, 3 BC & May 8, 2 BC with Jupiter later having a conjunction with Venus in Jun 17, 2 BC has happened ...
Frida's user avatar
  • 13
5 votes
2 answers
414 views

When was the concept of rogue planets first theorized?

So after watching the Kurzgesagt video about life on rogue planets I became fascinated by the concept. I did some digging, and the earliest reference to the concept I could find was Philip Wylie's ...
KingOfEphrya's user avatar
9 votes
1 answer
814 views

Why do planets in red dwarf star systems tend to have a higher probability to get tidally locked?

I have read about about the habitability of red dwarf systems on Wikipedia, as well as some web articles on similar topics. The problem is, it does not explain why and how it happened. Google search ...
Yudhi G.'s user avatar
  • 201
3 votes
2 answers
246 views

Is this a potential planetary setup for the Alpha Centauri System?

I originally posted this on the World Building SE, but I was suggested to post it here for a better answer. I am attempting to create a [semi]plausible star system in Alpha Centauri for a series. The ...
Markitect's user avatar
  • 305
5 votes
1 answer
209 views

Explanation about the resonance, mean motion resonance and libration

I am studying for a project the dynamics of multi-planetary system in resonance. I have two questions about this domain. In many articles they speak about 'mean motion resonance', what is the ...
Adrien Chimay's user avatar
7 votes
1 answer
451 views

Why is the TESS spacecraft finding fewer exoplanets than expected?

Judging from the Wikipedia page, I got the impression that TESS is underperforming, being expected to detect about 20000 candidate exoplanets in its primary two-year mission, but with only a few weeks ...
user2464424's user avatar
1 vote
1 answer
90 views

Stellar age determination - code

I'm trying to determine the age of some stars. I have many parameters that characterize these stars: $T_{eff}$ ,log ${g}$ ,$[Fe/H]$, $V$... I've tried to use the isochrones package but so far no ...
T. Silva's user avatar
  • 381
-1 votes
1 answer
202 views

Cannot plot Kepler FITS files with topcat in Windows

This is a continuation of my earlier question here. I was able to find Kepler data. Now I wanted to plot the data using Topcat. But when I tried to plot the data, I received error. Below is the error ...
Mr Learner's user avatar
31 votes
2 answers
3k views

Which of the planets would be detected if they were exoplanets?

An (almost-)omnipotent being selects the solar system, presses Ctrl+C, and then Ctrl+V several times, creating copies at distances of 5, 500, 50.000, and 5.000.000 light-years away. All in a direction ...
Ink blot's user avatar
  • 421
1 vote
1 answer
86 views

How to find Kepler/TESS data [duplicate]

I have some basic understanding of the Kepler/TESS mission. The missions both look at the stars and try to find the dip in the light from the stars to find possible existence of exoplanets (exomoons ...
Mr Learner's user avatar
13 votes
1 answer
1k views

How is an exoplanet characterised as "Earth-Like"?

Which features or characteristics are taken into account to characterize an exoplanet as "Earth-Like"?
Topcatmki's user avatar
  • 133
5 votes
1 answer
160 views

Could iron rain upset tidally locked WASP76b?

The Jupiter mass planet WASP76b orbits its 1.5*Sunmass star at 0.03AU and is tidally locked. The day side heats to 2400C which vaporizes metals, including iron observed in its atmosphere. The balmy ...
Pilothead's user avatar
  • 181
2 votes
0 answers
17 views

Could iron rain upset tidally locked WASP76b? [duplicate]

The Jupiter mass planet WASP76b orbits its 1.5*Sunmass star at 0.03AU and is tidally locked. The day side heats to 2400C which vaporizes metals, including iron observed in its atmosphere. The balmy ...
Pilothead's user avatar
  • 181
1 vote
1 answer
251 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 ...
BOB's user avatar
  • 13
0 votes
1 answer
503 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 ...
usernumber's user avatar
  • 17.4k
7 votes
1 answer
3k 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 ...
usernumber's user avatar
  • 17.4k
2 votes
2 answers
394 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 ...
user avatar
0 votes
1 answer
51 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 ...
user avatar
6 votes
1 answer
367 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 ...
Mike Stone's user avatar
1 vote
1 answer
202 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 ...
T. Silva's user avatar
  • 381
14 votes
3 answers
5k 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?
user30007's user avatar
  • 1,200
4 votes
1 answer
103 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 ...
Pranay's user avatar
  • 793
4 votes
2 answers
106 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{...
Carlos Vázquez Monzón's user avatar
2 votes
1 answer
190 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 ...
Astrid_Redfern's user avatar
3 votes
2 answers
291 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 ...
Peter U's user avatar
  • 1,599
1 vote
1 answer
224 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?
Carlos Vázquez Monzón's user avatar
3 votes
1 answer
192 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):...
J.G.'s user avatar
  • 325
2 votes
1 answer
106 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 ...
Carlos Vázquez Monzón's user avatar
1 vote
1 answer
123 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?
orbus's user avatar
  • 19
4 votes
1 answer
205 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 ...
usernumber's user avatar
  • 17.4k
25 votes
2 answers
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....
usernumber's user avatar
  • 17.4k
4 votes
2 answers
300 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 ...
usernumber's user avatar
  • 17.4k
3 votes
0 answers
79 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 ...
John Bowman's user avatar
2 votes
1 answer
161 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?
usernumber's user avatar
  • 17.4k
0 votes
1 answer
4k 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 ...
SHREYAA GANGULY's user avatar
5 votes
0 answers
166 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 ...
bandybabboon's user avatar
  • 4,188
5 votes
1 answer
40 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 ...
Joshua's user avatar
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