Questions tagged [exoplanet]

Questions regarding planets that lie outside the Solar System.

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Lightcurve Labels

I had a query regarding light curve labels. As simple as it goes we can plot time (MJD, BJD, etc) on X-axis. Also, I know we can plot magnitudes on Y-axis. Again I've seen papers showing Relative flux ...
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Can we measure planetary Love number of exoplanets?

I understand that Love number is the ratio between the tide raising potential to the actual deformation of the body, however, I'm not sure if there are ways to detect the Love number from observations ...
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Can distribution of stars / planets formation be a long-tailed one?

We know that peak of star formation already passed 10.1146/annurev-astro-032620-021910 and it looks like peak of planet formation occurred slightly after formation of Earth 10.1017/S1473550415000208 ...
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Is the closest planet to another planet always the innermost planet?

In our Solar system Mercury is not only the closest planet to Earth on average but also, for the same reason, the closest planet on average to all other planets (Jupiter, Neptune, etc...). Does that ...
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What is sin i in this graph and why is it there?

This is some data presented in a lecture on exoplanets that depicts the distribution of the sizes of super-Earths in comparison to the mass of Jupiter. I would like to know what the argument of the ...
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Which studies prior to 2018 "claimed to find evidence of extragalactic planets in the Andromeda galaxy"? Which instrument was used?

After the first round of popular news items about the "first extragalactic exoplanet" discovery, CNET's Did astronomers find the first planet outside of the Milky Way? It's complicated ...
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Which University of Oklahoma research purported to "detect thousands of extragalactic planets back in 2018"? Which instrument was used?

After the first round of popular news items about the "first extragalactic exoplanet" discovery, CNET's Did astronomers find the first planet outside of the Milky Way? It's complicated ...
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Is there any planet bigger than a star?

Or a star smaller than a planet? Which star and planet would be an example of this?
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After only one eclipse of its X-ray bright primary, how can astronomers estimate the first extragalactic exoplanet's period to be about 70 years?

Phys.org's Astronomers may have discovered the first planet outside of our galaxy says: While this is a tantalizing study, more data would be needed to verify the interpretation as an extragalactic ...
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Was the First Extragalactic Planet discovered in Andromeda Galaxy

In the news today, they announce a first possible planet outside the Milky Way galaxy has been spotted, in the Whirpool Galaxy. https://www.bbc.co.uk/news/science-environment-59044650 Surely the ...
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How often does the configuration of the Trappist-1 system repeat

My question is simply how long it takes for the 7 known planets in Trappist-1 to be in the same configuration in relation to their host star, and to each-other. Those seven planets are in a 2:3:4:6:9:...
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What are opinions of most planetary scientists on this study (link below), were there already some complex reviews in scientific journals?

I remember this two year old article from Universe Today about this study, "Stepwise Earth oxygenation is an inherent property of global biogeochemical cycling", by Lewis J. Alcott, Benjamin ...
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Shortest and longest wavelengths at which exoplanets have been resolved from their primaries?

Phys.org's Radio signals from distant stars suggest hidden planets summarizes the Nature Astronomy paper The population of M dwarfs observed at low radio frequencies (also in arXiv) but this is an ...
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Why was there a gap in exoplanet detection in 2015?

The question How has the number of known TNOs evolved over time? contains a link to this image: Number of extrasolar planet discoveries per year through April 2018, with colors indicating method of ...
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What precisely leads to planets like COCONUTS-2b to orbit so far away from their host stars, 6000 AU in its case?

Taking our Solar System as an example, most gas giants formed relatively close by (a few AU) and drifted away to reasons I don't know, from an explanation I recall reading. Simply orbiting a few AU ...
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Maximum distance at which planetary atmospheres can be analyzed during transits?

Is there a limit for how far away you could make a spectroscopic analysis of a planet when it transits its star, to detect bio markers and industry markers? What would the limit be with current ...
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Incorrect best period fit over phase-folded data

I am using the astropy Lomb-Scargle periodogram here, https://docs.astropy.org/en/stable/timeseries/lombscargle.html to get the best period fit using its model() method for simulated data given in ...
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Precision of orbital period of exoplanets vs solar system planets (Extrasolar Planets Encyclopedia)

I noticed that the Extrasolar Planets Encyclopedia lists the orbital period of L 98-59 b in days to 7 decimal places. Can astronomers really measure orbital period of exoplanets to greater precision ...
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Can a terrestrial planet orbit an icy planet (or vice versa)?

I know that the composition of planets is dependant on the equilibrium temperature at its orbit - for example, if below a certain temperature, water and other volatiles become solid, allowing them to ...
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Where to find data on orbits of exoplanetary systems?

I hope this is the correct place to ask this question which entails asking if there is a database much like the JPL NASA one for the solar system, but for exoplanetary systems? I am conducting an n ...
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What portion of all exo-planets can't be observed? [duplicate]

Exo-planets are usually observed by small decreases of the outgoing power of the stars accompanying them, when the planet passes between us and the star. The orbits of the exo-planets lay in one plane....
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When is an exoplanet called a Super-Jupiter? or Super-Earth?

Is there a recognized definition of what size an exoplanet gas planet has to be to be classed as a SuperEarth or SuperJupiter? Is it based on radius or mass? i.e. All gaseous exoplanets > 1 ...
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Would Atlas Pro's prediction about the color of plant in Kepler-186F work as a biosignature to search for life?

The Atlas Pro video that prompted this question is this. Tl;dr: it is argued that due to the different spectrum of radiation emitted by Kepler-186 and what is known about the evolution of ...
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Calculate the habitable zone of a star based on NASA Exoplanet Archive

I am completely new to this! I am trying to find if an exoplanet in the Exoplanet Archive is the habitable zone of its host star. My intention is to create a new boolean column in a Pandas Dataframe ...
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Could rogue planets harbor life?

On July 21 at 10 am, Seti Talks will be discussing the topic of "Could Rogue Planets Harbor Life". Supposedly there are 50 billion such planets in the Milky Way. I would think that the ...
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From Proxima b, could any planets around Sol be imaged directly by a strong telescope? If so, which ones would be easiest to spot?

How strong would a telescope (and what kind of telescope) on Proxima Centauri b have to magnify to discern any planets around Sol, and which planets would be easiest to spot? One might think the ...
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Special case of rotation period

Rotation period is either prograde, like the Earth, or retrograde, like Venus. How likely is it for a body orbiting its parent object (either a planet around a star or a moon around a planet) to have ...
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.fits Files for Exoplanets

I am learning to use AstroImageJ software. And using this software to plot transit graph for Exoplanet orbiting the star. I want to know from where can we find the .fits file of target star ? I tried ...
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What is the most grazing exoplanet transit that has been reported with high confidence?

The abstract of Past, present and future stars that can see Earth as a transiting exoplanet reads: In the search for life in the cosmos, transiting exoplanets are currently our best targets. With ...
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Planets around O-type stars [duplicate]

The paper https://arxiv.org/abs/0707.2895 says that solid planets up to thousands of Earth masses may be able to form around massive stars (B-type and O-type stars; 5–120 solar masses), where the ...
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Axial tilt of exoplanets

Some directly imaged exoplanets have had their rotation measured but has the axial tilt of any exoplanet been measured? If not, when might we get the first measurement of axial tilt of an exoplanet?
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Will we ever be able to see the surface of exoplanets directly?

When exoplanets are depicted, artist's impressions are used. The presence of exoplanets is observed by a dip in the emitted power of a star when a planet moves between us and the star (a kind of star ...
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Star brightness data to study exoplanets with the transit method?

Can someone tell me how I can find the star brightness data to study exoplanet using transit method? The file should be in comma separated value (CSV) format or any other formats that can be latter ...
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Is the transition between ice giants and Jupiter-like gas giants somewhat fluid?

The ice giants Uranus and Neptune are often being distinguished from Saturn and Jupiter who consist mostly of hydrogen and helium, while the ice giants have more of heavier elements than hydrogen and ...
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Retrograde orbits of exoplanets

Some Hot Jupiters have retrograde orbits. What causes this? Are there any other common factors amongst the planets with these orbits and have any other types of exoplanet been found with retrograde ...
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Spin-down of gas-giants during formation

In the paper https://arxiv.org/abs/1712.00457 about rotation rates of gas giants it says: "owing to accumulation of angular momentum stored in the source material, a planetary mass object should ...
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Why does one presume that there is at least one Earth-like exoplanet around one in five stars?

When reading the question about the first use of the term exoplanet (about which Giordano Bruno and Isaac Newton already speculated but they didn't use that term for them, I think), I searched a ...
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When was the term 'exoplanet' first used?

Who , when and where was the term 'exoplanet' coined?
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What does it mean for a planet to have an "icy" core?

My understanding of the physics of planets leans heavily on my understanding of the physics of stars - of course there are important differences. One important difference that I've found is the nature ...
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Why did Gemini Planet Imager hardly detect anything?

GPI was originally thought able to directly image tens of planets but so far has only discovered one new planet? Why is this? From Gemini Observatory; Adaptive optics Source
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Could a heavy exoplanet squeeze water into being liquid and 4° warm?

Let's say there is an exoplanet orbiting its host star well outside its habitable zone. Suppose further that it has a lot of water, being perhaps comparable to earth when it comes to the volume ratio ...
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Super-puff exoplanets

Super-puffs are gas giant sized planets with masses only a few earth masses. What causes planets to form with such low density and why are they so rare?
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Were K2-141b and WASP-63b selected as the first two exoplanet atmospheres for JWST to look at during its first year of observations? If so, why?

In The Observatory @Donald.McLean linked to Scientists will peer at first galaxies with James Webb telescope which says in part: The new telescope will augment science performed by Hubble, not ...
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How close to a host star can a tidally locked planet be and its dark side still maintain a moderate temperature?

So, imagine an atmosphere-less planet, tidally locked to a sun-like star. How close to the star can the planet be before its dark side becomes too hot? I imagine that at some point the rocks on its ...
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Planetary tails: How many have we observed yet?

Just recently I learned that Mercury has a sodium tail and it is actually well studied since long: As a result, the planet has the appearance of a comet, with a tail that's been observed streaming ...
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Crust thick enough to prevent volcanos

Could you have an Earth-like planet with a crust thick enough to prevent volcanos from forming?
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Is the measurement of distance and position of remote celestial bodies accurate?

Considering that light is affected by gravity, how accurate are measurements of distant stars and galaxies? When light passes through objects with great mass, such as Jupiter size planets, stars, or ...
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Is the measurement of distance and position of far away objects accurate? [duplicate]

Considering that light is affected by gravity, how accurate are our measurements of distant stars and galaxies? When light passes through objects with great mass, such as Jupiter size planets, or ...
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Are accretion disks the only way stellar planetary systems form?

The accepted theory for the formation of our Solar System is from an accretion disk. A molecular cloud is thought to have collapsed under its own gravity and formed a disk. Most of the matter in the ...
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Is the discovery of a "mass gap" black hole by this tiny telescope just plain luck/serendipity or could it be the first of many similar discoveries?

The Kilodegree Extremely Little Telescope is a pair of modest lenses with high quality medium format CCDs attached sitting on oversized mounts in Arizona and Sutherland. These very modest instruments ...

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