Questions tagged [exoplanet]
Questions regarding planets that lie outside the Solar System.
327
questions
3
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1answer
34 views
I have seen so many articles but how can finding exoplanet density determine composition
I have seen some articles and lectures that state but i cant seem to put my finger on on how does density affect composition and how are you able to determine composition from exoplanet density.
1
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1answer
23 views
What exactly is a fortney grid transmission spectra modeling
I am trying to model some exoplanets and I don't understand how this model works. Below is a link of the model. What I don’t understand is how does graphing the transit depth vs wavelength provide ...
2
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1answer
27 views
Can concentration of gas in exoplanet atmosphere be found out from wavelength and absorbing radius from spectral data?
I was working on exoplanet spectral data from which I need to infer the concentration of gases. However, the exoplanet spectroscopy data contains only absorption wavelength and absorption radius. Is ...
9
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1answer
663 views
What do the words “p-type” and “s-type” mean?
As explained in various sources (such as that answer), a planet in an s-type orbit orbits one of the stars of a binary star system, whereas a planet in a p-type orbit orbits both stars. A synonym for ...
1
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1answer
30 views
How to recognize exoplanet transit
I am using Python package lightkurve for exoplanets searching by the transit method. When I download light curve of some star and apply periodogram, I find frequency and power of periodic components ...
6
votes
2answers
91 views
Planetary system orientation & the search for exoplanets
A quick review of photographs of galaxies will reveal that not all galaxies are orientated in the same plane as the field of view from Earth. Some galaxies are parallel to our field of view and we see ...
2
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0answers
58 views
Where did the idea that tidally-locked planets have a big hurricane come from?
I've been noticing a bit of a trend in the depiction of tidally-locked habitable planets, where they are shown having a huge hurricane-like storm over the daylight hemisphere. Here's an example, and ...
3
votes
1answer
60 views
What name was voted for Tau Boötis b by the Name Exoworlds Project?
In 2015, the exoplanet Tau Boötis b was included in the Name Exoworlds Project, a project where various international astronomy organizations would propose names for a selection of known exoplanets ...
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2answers
53 views
How Can I interpret this particular light curve without reading data on the side
There is only one dip in flux recorded. How can I interpret this particular light curve and find planetary radius
https://exo.mast.stsci.edu/exomast_planet.html?planet=55Cnce
0
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1answer
43 views
How can I find the radius of a exoplanet using doppler spectroscopy [closed]
I have the stellar and planet mass, planet velocity, radial velocity of star, stellar semimajor axis.
How should I go about to find the radius of this exoplanet?
3
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1answer
86 views
Are there ways to determine a star's spectral type without the spectrum itself?
Because of the lack of available data online, I am trying to find other ways to determine an exoplanet's host star's spectral type.
2
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1answer
51 views
Does anyone have spectra on exoplanet HD 219134b? How could one know either way?
I have foraged through the internet to no avail.
Is there a way to systematically check if spectra from a given exoplanet has been reported, like a catalog or list of references, or is a literature ...
5
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3answers
257 views
What does BJD-2450000 mean?
In different papers I've encountered time indications in BJD-2450000. I know that BJD stands for Barycentric Julian Date, but I don't understand the meaning of the suffix -2450000.
This is an example ...
2
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1answer
168 views
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?...
2
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1answer
22 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.
3
votes
2answers
92 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 ...
9
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3answers
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 ...
9
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5answers
3k views
Why are there 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 ...
2
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0answers
46 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 ...
3
votes
1answer
95 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 ...
5
votes
1answer
108 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 ...
4
votes
2answers
172 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.
...
3
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1answer
103 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 ...
2
votes
1answer
59 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'...
2
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1answer
79 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 ...
2
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1answer
150 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 ...
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1answer
132 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 ...
5
votes
2answers
189 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 ...
0
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0answers
12 views
Radial velocity data in ALADIN or TOPCAT for Binary Systems
I just installed both, Aladin and Topcat VO tools.
I want to know how to search for:
HD 226868 and A0620-00 radial velocity data or photometric curves to derive the hidden black hole mass in those ...
8
votes
1answer
495 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 ...
2
votes
1answer
107 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 ...
4
votes
0answers
25 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 ...
7
votes
1answer
375 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 ...
1
vote
1answer
68 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 ...
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1answer
69 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 ...
28
votes
2answers
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 ...
1
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1answer
61 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 ...
13
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1answer
949 views
How is an exoplanet characterised as “Earth-Like”?
Which features or characteristics are taken into account to characterize an exoplanet as "Earth-Like"?
5
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1answer
117 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 ...
2
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0answers
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 ...
1
vote
1answer
114 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
74 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
173 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
366 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
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1answer
39 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
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1answer
109 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
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1answer
82 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
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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
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1answer
66 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{...
