Exoplanet Definition and 70 Threads

TL;DR Summary: For a transiting exoplanet, we find it takes 4.3 days from the start of the transit for the host star to reach a minimum brightness, which lasts for 10 days. Show that the radius of the exoplanet is about 1/2 of Earth’s radius if its orbital radial velocity is 17 m/s. I am...

"A new investigation with NASA’s James Webb Space Telescope into K2-18 b, an exoplanet 8.6 times as massive as Earth, has revealed the presence of carbon-bearing molecules including methane and carbon dioxide. ... The abundance of methane and carbon dioxide, and shortage of ammonia, support the...

Even an offhanded remark by some character in a sci-fi story can have major implications. With my story based on a generation ship in the late 25th century, I considered it self-evident that humanity would already have explored most of the planets and moons within the solar system before trying...

https://phys.org/news/2023-03-massive-giant-exoplanet-tess.html It is one of the most massive and densest exoplanets. For comparison, Mo has a density of 10.22 g/cm3 and Ta has a density of 16.6 g/cm3. I would suspect that some of the density is derived from the high compressive pressure of...

I recently watched History of the Universe and they talked about the Giant Arc, a large scale structure that spans 3.3 billion light years long, exceeding the hypothetical limit of 1.2 billion. The Arc was discovered last year. https://en.wikipedia.org/wiki/The_Giant_Arc They said if the Giant...

I was wathcing a video about radial velocity method for seeking exoplanet(video) and on 3:05 author writes that momentum of a star equal momentum of a planet. Why?

The HR 8799 star is 129 light-years away from us, in this image we can see thermal emissions coming from these planets. Do these emissions move at the speed of light? If so does it mean that what we are seeing in this image is how the planets looked like in infrared 129 years in the past?

Summary: Why is the Nobel committee acting as though the discovery was of the same order as the discovery that Andromeda was another galaxy. Now this has been bugging me since ever. but the Nobel committee brought it up again "This discovery (1995 exoplanet) has opened up a Universe far...

Summary: water found on potentially habitable exoplanet from the BBC https://www.bbc.com/news/science-environment-49648746

Hi all! We are looking for more observatories and amateur astronomers who might want to join the project. The Habitable Exoplanet Hunting Project is a worldwide network of amateur astronomers searching for new potentially habitable exoplanets. I am coordinating over 20 observatories located in...

Astronomers have discovered a potentially habitable exoplanet around Teegarden's Star. Teegarden is an old red dwarf star 12 light-years away in the Aries constellation. The exoplanet found, called Teegarden b, has a minimum mass almost identical to Earth. It orbits within the star's...

1903.11078.pdf Would it not be cool to find an exoplanet from your back lawn. This paper is to introduce an online tool1 for the prediction of exoplanet transit light curves. Small telescopes can readily capture exoplanet transits under good weather conditions when the combination of a bright...

By the GRAVITY team -

Hello. In this issue of the American Scientist magazine, https://www.americanscientist.org/magazine/issues/2018/september-october, there's an article by Dominik Kraus of the Helmholtz-Zentrum Dresden-Rossendorf Institute of Radiation Physics about the internal composition of the planets Uranus...

Kepler space mission has discovered thousands of exo-planet candidates. Why are they just candidates ? Why followup ground based study is required ? Why is Kepler unable to confirm them ? Second thing, how are scientists going to differentiate between eclipsing binaries mimicking to be exoplanets.

does anyone have any information on why the vast majority of exoplanets are located in one spot? any papers on the topic? the following link does not graph RA vs DEC but instead does something about planet size, if you wish to use it please select RA for the x-axis and DEC for the y-axis, both...

Scientists are looking for Earth like planets/bodies to find life on other planets/bodies, somewhere that is warm enough that liquid water can exist, and somewhere with basic organic molecules. Here's where I have a concern, in the 4 billion years of Earth's life, to our knowledge life had only...

Is there a guide, based on existing evidence, that I could use to infer realistically how color would be affected on alien worlds due to factors like star class, luminosity, atmospheric composition, etc? I'm planning to develop a not-too-too-distant future scenario where all the stars in...

In descriptions of the newly discovered exoplanet, named Proxima Cen b, orbiting Proxima Centuri, it is mentioned that a determination of its size could be established by observing the planet’s transit in front of Proxima centuri, which would reveal the exoplanet’s diameter. It is my...

Is it possible for planets to have multiple liquid layers? Like a ocean made of water, with an ocean within, consisting of a heavier liquid. And could it have a sirculation, as water does on Earth?

Following the same way to detect a black hole via gravitational lens. Is it possible? Use the same methodology to detect exoplanet via its magnetic field and the distortion caused in the light of Star? Can we find a phase or polarization change in part of a light from a star caused by an...

http://www.theonion.com/article/nasa-discovers-distant-planet-located-outside-fund-53595 "WASHINGTON—Noting that the celestial body lies within the habitable zone of its parent star and could potentially harbor liquid water, NASA officials announced at a press conference Thursday they have...

Published today in Nature: Anglada-Escudé et al. (2016) A terrestrial planet candidate in a temperate orbit around Proxima Centauri. Nature: 536: 437. doi:10.1038/nature19106 Popular press summary...

Hello guys, I'm doing my physics coursework on kepler's third law and I'm finding the minimum mass and semi-major axis of a unknown planet. I have the following data: Stellar mass Mstar = 1.31 ± 0.05 Msun Orbital period P = 2.243752 ± 0.00005 days Radial velocity semi-amplitude: V = 993.0 ±...

How close must a planet be to its parent star in order for it to be tidally locked?

Welcome to my thread. As you have seen from the title, scientists have just discovered a new potentially earth-like planet; it's the closest to us. It's four times the mass of the Earth and it's only 14 light years away. The planet is called Wolf 1060c. Read more about it here. What do you...

Does anyone know the best online source(s) for kepler exoplanet data? Thank you.

GJ 1132b, the new neighbour is a rocky, Earth-sized planet that's located only 39 light-years away - so lcose we could almost hit it with a rock. http://www.sciencealert.com/the-closest-earth-like-exoplanet-so-far-has-been-discovered-and-it-s-got-astronomers-excited?perpetual=yes&limitstart=1

Lets assume that a human colony wants to reform time measurement units for more practical. Reasoning: -circadian rhythm a bit exceeds 24h, so perfect day would be around 24h and 10 minutes ( http://www.circadiansleepdisorders.org/info/cycle_length.php ) -readjusting year zero, somewhere...

Say hello to HD 219134b - a rocky exoplanet recently discovered using HARPS-North instrument on the Italian 3.6-meter Galileo National Telescope in the Canary Islands, who's existence has been confirmed by NASA's Sptizer Space Telescope. At a distance of 21 light years, it is the closest...

As you probably know every respectable RPG needs an underground complex below a city... Usually it involves high gov spending on spacious severs full of mutated creatures... such constructions are usually hard to justify to taxpayers :D OK, more seriously, the setting: 1) the city is located on...

In an article on phys.org [http://phys.org/news/2015-06-red-dwarf-planet-hydrogen-massive.html] , it states that the exoplanet GJ 436b is 33x closer to its parent star than the Earth is to our sun. It also states that the exoplanet is less than 2 million miles away from the star. If I assume an...

I wondered about possibility of using ground effect by blended wing body, turboprop planes. Purposes: -to save fuel (for example for flying tankers); -to return partially damaged plane; -to hide under radar and become visible for ships in the last moment; -to allow flight of overloaded plane...

Assumptions: -more or less contemporary technology -virgin planet which is glared by lustful humans ;) -habitable (oxygen, reasonable temperature) -no requirement for 100% certainty, reasonable guess is OK (the point is to find quite good place for colony very soon, not a perfect one in a few...

Homework Statement Hi, I'm a senior taking a course on exoplanets right now. I have a question regarding their transit across a star. I understand how it works in theory, but I had some questions regarding the equation to use. Here's the problem: A 0.05 solar radius planet orbits a...

I have a question concerning the eccentricity vs orbital period of observed exoplanets. Going to this link let's you plot different exoplanet properties on each axis of a graph. Plugging in Orbital Period for the X-axis and Eccentricity for the Y-axis shows that a trend towards decreasing...

Would an Earth-like planet while getting a tidal lock, get it influenced by landscape of surface? So that the most stable state would be to have a continent on the center of the side close to its star and the other on the exactly opposite side? Or maybe because of hydrostatic equilibrium such...

I made a brain storming, but hope that someone would be able to point out what I may have missed out. Assumptions - atmospheric pressure is 3 atm, but molar concentration of oxygen is comparable to earth. The rest is mostly nitrogen. (there are a few more assumptions like tidal lock, a bit lower...

Would on a exoplanet with dense atmosphere zeppelin/blimp better idea than a plane? If I get it right there would be: -much higher buyancy (argument for zeppelin) -higher drag (argument against plane) -higher lift (argument for plane) (but I'm not good enough to know what would matter)...

I was having a discussion with a colleague earlier today regarding exoplanet exploration. Being that the biggest challenge for mankind to travel to distant planets is that time dilation would make such an extreme effect that by the time we reached our destination thousands of years may have...

I was wondering if anyone would help me get my hands on some telescope data and images of exoplanets. I know they must exist somewhere in databases on the internet, but I haven't been able to find them myself. It would be great if one of you could show me where I could get them or even if you...

At least that is the interpretation of the scientists - 200 times larger than the system around Saturn, and thick enough to make a complicated light curve during stellar transit. The transit happened in 2007 and took nearly two months. A gap in the ring system hints at an exomoon. As they just...

Idea is a cold planet with dense atmosphere (10 atm) where human can survive, while a liquid carbon dioxide would be possible. As the main component of atmosphere I think about neon, because it should not cause nitrogen narcosis: http://en.wikipedia.org/wiki/Nitrogen_narcosis#Causes...

I want an exoplanet/exomoon with really deep depression. It would be the only place on that planet that's really habitable for humans without breating aid. Idea: -lower gravity (somewhere around 0.8 g) so the mountains should be able to be a bit taller -one supercontinent that's slowly...

Great project to do! DIY Exoplanet Detector with a DSLR

Assumption: -there is no serious astronomical phenomena determining that - either the planet is tidally locked, has too long day cycle, or is too far away from its star and inside bases anyway humans rely on artificial light; -there is a colony of a size of at least medium city; -post scarcity...

How do we detect if there is more than 1 exoplanet orbiting a star using radial velocity method? I read this but I didnt understand it. Can someone explain the answer in Laymans terms? "Multiple planets will cause a stars radial velocity curve to show two periods: a long gradual change due...

The IAU plans to name 305 exoplanets. Currently, organizations can make suggestions, in 2015 the public can vote on those suggestions. This is organized on nameexoworlds.org (IAU press release) While a proper name is certainly nicer than "HD 121504 b", it won't be an easy task to keep up...

Please help me with this astronomy problem. I am supposed to calculate the smallest planet that is detectable with the transit method, given a signal to noise ratio and a star's radius: Suppose the star is seen at its distance D with a signal to noise ratio of S/N = 10^4. This means that in...

http://www.nasa.gov/ames/kepler/nasas-kepler-discovers-first-earth-size-planet-in-the-habitable-zone-of-another-star/index.html#.U1BUR1csSuQ Don't know if this is the right section to post this , but I'm a sucker for any news on exoplanets so here goes.