Questions tagged [exoplanet]

Questions regarding planets that lie outside the Solar System.

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What's the difference between an exoplanetary transit and eclipse? [duplicate]

This article states Their data contained eclipses for all 25 exoplanets, and transits for 17 of them. This page from NASA explains the difference between an eclipse and a transit: Like an eclipse, ...
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1 vote
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34 views

Why do we estimate the Minimum mass when we are dealing with exoplanets?

While solving astronomy problems dealing with exoplanets, I always see that the question asks for minimum mass instead of the mass. Why is that so and why is the calculated mass minimum mass? example ...
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2 votes
0 answers
39 views

Best way to quantify the tidal stress on an exoplanet?

I'm trying to assess the tidal stresses different exoplanets experience during their orbits. The known parameters are usually mass $M$, radius $R$, eccentricity $e$, orbital period $T$, and semi-major ...
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5 votes
1 answer
63 views

Is an extreme precession on a tidally locked planet possible?

Let's assume an exoplanet orbits a red dwarf star closely enough that is tidally locked to it. Is it possible for the planet to have a significant axial precession? If not naturally, is it possible to ...
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0 votes
1 answer
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Data base of exoplanets with common names to use beside Nasa Exoplanet Archive

For a project I am working on, I use data from the NASA Exoplanet Archive at https://exoplanetarchive.ipac.caltech.edu/TAP/sync?query=select+*+from+ps&format=json I take this json data down and ...
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1 vote
2 answers
152 views

Astrophysics Ph.D. thesis on intergalactic rogue planets and their habitability; how active is this field of research?

Is the habitability of intergalactic rogue planets something that has been studied a lot? The reason that I'm asking is that I've just started my PhD program last year and I'm wondering/concerned if ...
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7 votes
1 answer
110 views

Is one transit enough to be confident that we detected an exoplanet

Everything is pretty much in the title. I was thinking about the transit method and was wondering if the signature of a transit on the light curve of a star is distinctive enough to only need one ...
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3 votes
1 answer
74 views

What is the densest known exoplanet?

55 Cancri e is said to be 60 percent larger in diameter than Earth but have 8 times, the mass, making it twice as dense as Earth, and almost as dense as lead. https://www.space.com/11544-densest-alien-...
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3 votes
1 answer
72 views

Accurate formula for calculating the mass of an exoplanet using the transit method

A friend and I did some work on exoplanets with the help of a research institute (IEEC in Spain) for a major high school project. What we did was to "redetect" the exoplanet XO-6b through ...
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0 votes
1 answer
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Can we use atmospheric retrieval techniques on stars?

Although there are lots of examples of atmospheric retrieval techniques being used on exoplanets, and recently brown dwarfs, I can't find any mention of atmospheric retrieval techniques being used on ...
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2 votes
1 answer
32 views

What does "RV model including a GP with a quasi-periodic covariance structure" mean?

A candidate short-period sub-Earth orbiting Proxima Centauri says: 4.1 Simple periodogram analysis ]We first consider a very simple pre-whitening procedure applied to the CCF RVs in order to ...
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2 votes
0 answers
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Contradictory errors in python package VESPA

VESPA is a python package that can calculate the False Positive Probability for Exoplanets. Here is the link to the repository https://pypi.org/project/VESPA/ https://github.com/timothydmorton/VESPA ...
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1 vote
1 answer
148 views

What is a Keplerian shear

I was reading an article on Gas Giants and how some form close to their host star. One line in the article says: A region of the proto-planetary disk will be susceptible to gravitational instability ...
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0 answers
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How massive can a carbon planet be?

A carbon planet is a theoretical type of planet with more carbon than oxygen. How massive can a carbon planet be? Could you have a neptune-like planet except with all the water replaced with ...
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3 votes
1 answer
93 views

The reason for an exoplanet density increase of planets closer to a star

From the NASA exoplanet archive system it can be seen that in the range of $0.02-0.06~\text{AU}$ distance an exoplanet is to its star, as distance drops down, the planet density increases linearly: A ...
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4 votes
2 answers
284 views

Probability of transit of an exoplanet in front of its star

I'm trying to calculate the probability of transit of an exoplanet in orbit around a star of diameter $d$, at a distance of $4d$ from its centre. Here's what I did: In this figure, we are only ...
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1 vote
0 answers
31 views

Power law of object mass in Milky way

Red dwarfs are more common than larger stars. Does this trend continue to smaller objects? If you take every "condensed object" from dust grains through asteroids, planets, and stars in the ...
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2 votes
0 answers
27 views

Infrared ozone line detection

I was recently reading Jack R. Woods' response on this forum: Could the James Webb Space Telescope detect biosignals on exoplanets? In an ideal situation (say looking at absorption lines of a super-...
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2 votes
2 answers
191 views

Would a planet orbiting black hole be detectable?

Usually missions like Kepler are finding exoplanets orbiting (the barycenter of systems related to...) stars at distances that are not common if compared with the Solar System. This finding (as I ...
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0 votes
0 answers
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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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1 vote
0 answers
42 views

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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2 votes
0 answers
43 views

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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23 votes
10 answers
6k views

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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10 votes
1 answer
1k views

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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1 vote
1 answer
49 views

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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1 vote
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30 views

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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24 votes
4 answers
8k views

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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6 votes
2 answers
90 views

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 links to Di Stefano et al. 2021 A possible planet candidate in an external galaxy detected through X-ray transit (...
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1 vote
1 answer
89 views

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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0 votes
0 answers
18 views

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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2 votes
2 answers
182 views

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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3 votes
1 answer
58 views

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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4 votes
1 answer
290 views

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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8 votes
3 answers
2k views

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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1 vote
1 answer
48 views

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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  • 187
1 vote
1 answer
59 views

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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2 votes
0 answers
40 views

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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1 vote
1 answer
112 views

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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5 votes
2 answers
260 views

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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0 votes
0 answers
46 views

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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1 vote
1 answer
116 views

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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2 votes
0 answers
36 views

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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2 votes
1 answer
121 views

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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7 votes
3 answers
3k views

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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5 votes
1 answer
148 views

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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  • 1,538
2 votes
1 answer
98 views

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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0 votes
0 answers
41 views

.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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1 vote
1 answer
70 views

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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0 votes
0 answers
73 views

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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3 votes
1 answer
88 views

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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