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Mars_B4_Moon

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Registered: 2006-03-23

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Re: Extrasolar Habitable Planets

‘Unstable’ Moons May Be Obliterating Alien Life across the Universe
https://www.scientificamerican.com/arti … -universe/

An exomoon survey of 70 cool giant exoplanets and the new candidate Kepler-1708 b-i
https://www.nature.com/articles/s41550-021-01539-1

Exomoon Kepler-1625b-i
https://www.planetary.org/space-images/ … er-1625b-i

Kepler-1625b is an extrasolar planet orbiting the Sun-like star Kepler-1625, located around 8,023 light years (2,460 parsecs) away from Earth in the constellation Cygnus.
https://astronomical.fandom.com/wiki/Kepler-1625b

Europe's exoplanet-hunting CHEOPS mission extended through 2026
https://www.space.com/esa-cheops-exopla … nsion-2026

CHEOPS CHaracterising ExOPlanets Satellite a European space telescope to determine the size of known extrasolar planets, which will allow the estimation of their mass, density, composition and their formation, it is the first Small-class mission in ESA's Cosmic Vision science programme

Can A Top-down Freezing Core Explain Ganymede’s Magnetic Field?
https://sciencetrends.com/can-a-top-dow … tic-field/

The Ever More Puzzling and Intriguing “Tabby’s Star”
https://web.archive.org/web/20170118190 … bbys-star/

the star had experienced two major and dissimilar dips in brightness—a highly unusual and perplexing phenomenon. The dips appeared much too large to represent the passage of an exoplanet, so explanations tended towards the baroque — a swarm of comets, a vast dust cloud, even an alien megastructure (proposed as a last possible explanation). The observation was first identified by citizen planet hunters working with Boyajian, making it an even more compelling finding.

Did Tabby’s star going through periodic and deep dimmings because of dust and debris clouds that pass edbetween it and the mirror of the Kepler Space Telescope? 
https://web.archive.org/web/20170103213 … bbys-star/

Extra Solar Moons, a number of candidates, in particular around Kepler-1625b, Kepler-1708b, and Kepler-1513b. Two potential exomoons that may orbit rogue planets have also been detected by microlensing, astronomers reported that the observed dimmings of Tabby's Star may have been produced by fragments resulting from the disruption of an orphaned exomoon. Some exomoons may be potential habitats for extraterrestrial life.
https://web.archive.org/web/20150127120 … t-planets/

Evidence for a large exomoon orbiting Kepler-1625b
https://www.science.org/doi/10.1126/sciadv.aav1784

Exomoons are the natural satellites of planets orbiting stars outside our solar system, of which there are currently no confirmed examples. We present new observations of a candidate exomoon associated with Kepler-1625b using the Hubble Space Telescope to validate or refute the moon’s presence. We find evidence in favor of the moon hypothesis, based on timing deviations and a flux decrement from the star consistent with a large transiting exomoon. Self-consistent photodynamical modeling suggests that the planet is likely several Jupiter masses, while the exomoon has a mass and radius similar to Neptune. Since our inference is dominated by a single but highly precise Hubble epoch, we advocate for future monitoring of the system to check model predictions and confirm repetition of the moon-like signal.

The magnetic field and internal structure of Ganymede
https://www.nature.com/articles/384544a0

At Jupiter, JUICE and Clipper Will Work Together in Hunt for Life
https://www.scientificamerican.com/arti … -for-life/
A soon-to-launch European mission is the first of two spacecraft—with the other coming from NASA—that will hunt for signs of habitability on Jupiter’s icy moons

Kepler 1625b: Orbited by an Exomoon?
https://www.centauri-dreams.org/2018/10 … n-exomoon/

Mars_B4_Moon

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Registered: 2006-03-23

Posts: 9,776

Re: Extrasolar Habitable Planets

A Rogue Earth and Neptune Might Have Been Found in Older Data

https://www.universetoday.com/160695/a- … lder-data/

Void

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Registered: 2011-12-29

Posts: 7,819

Re: Extrasolar Habitable Planets

This is interesting: https://www.bing.com/videos/riverview/r … ORM=VRDGAR

So, eyeball planets may wink

Jurys out on what that means to us.

Done

Last edited by Void (2023-04-19 19:22:27)

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Mars_B4_Moon

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Registered: 2006-03-23

Posts: 9,776

Re: Extrasolar Habitable Planets

some more Exoplanets news

China to hunt for Earth-like planets with formation-flying telescopes
https://spacenews.com/china-to-hunt-for … elescopes/

Scientists discover rare element in exoplanet's atmosphere
https://www.spacedaily.com/reports/Scie … e_999.html
The rare metal terbium has been found in an exoplanet's atmosphere for the first time. The researchers at Lund University in Sweden have also developed a new method for analyzing exoplanets, making it possible to study them in more detail.

KELT-9 b is the galaxy's hottest exoplanet, orbiting its distant star about 670 light years from Earth. The celestial body, with an average temperature of a staggering 4,000 degrees Celsius, has since its discovery in 2016 excited the world's astronomers. The new study in Astronomy and Astrophysics reveals discoveries about the scalding-hot oddball's atmosphere.

"We have developed a new method that makes it possible to obtain more detailed information. Using this, we have discovered seven elements, including the rare substance terbium, which has never before been found in any exoplanet's atmosphere", says Nicholas Borsato, PhD student in astrophysics at Lund University.

Terbium is a rare earth metal that belongs to the so-called lanthanoids. The substance was discovered in 1843 by the Swedish chemist Carl Gustaf Mosander in the Ytterby mine in the Stockholm archipelago. The substance is very rare in nature, and 99 percent of the world's terbium production today takes place in the Bayan Obo mining district in Inner Mongolia.

"Finding terbium in an exoplanet's atmosphere is very surprising", says Nicholas Borsato.

Mars_B4_Moon

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Re: Extrasolar Habitable Planets

Newborn Star Surrounded By Planet-Forming Disks at Different Angles

https://www.universetoday.com/161229/ne … nt-angles/

Mars_B4_Moon

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Posts: 9,776

Re: Extrasolar Habitable Planets

One in Ten Stars Ate a Jupiter (Or Bigger)

https://www.universetoday.com/161272/on … or-bigger/

In space, cataclysmic events happen to stars all the time. Some explode as supernovae, some get torn apart by black holes, and some suffer other fates. But when it comes to planets, stars turn the tables. Then it’s the stars who get to inflict destruction.

Expanding red giant stars consume and destroy planets that get too close, and a new study takes a deeper look at the process of stellar engulfment.

Stars like our Sun will eventually become red giants. Through nuclear fusion, they convert mass into energy (E=mc2, right?) Over their lifetimes, they shed so much mass as energy that they eventually expand and turn red. For planets that are too close to these swollen spheres, it spells the end. They’re eventually engulfed and completely destroyed.

Mars_B4_Moon

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Registered: 2006-03-23

Posts: 9,776

Re: Extrasolar Habitable Planets

Astronomers spot benzene in planet-forming disk around star for first time

https://www.spacedaily.com/reports/Astr … e_999.html

An international team of astronomers including several Dutch researchers has observed the benzene molecule (C6H6) in a planet-forming disk around a young star for the first time. Besides benzene, they saw many other, smaller carbon compounds and few oxygen-rich molecules. The observations suggest that, like our own Earth, the rocky planets forming in this disc contain relatively little carbon.

Last edited by Mars_B4_Moon (2023-05-12 02:49:33)

Mars_B4_Moon

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Re: Extrasolar Habitable Planets

NASA’s Spitzer Telescope, TESS Discovers Potentially Volcano-Covered Earth-Size World
https://spacecoastdaily.com/2023/05/nas … ize-world/

A likely volcano-covered terrestrial world outside the Solar System
https://exoplanetes.umontreal.ca/en/a-l … ar-system/

NASA’s Spitzer Space Telescope finds an Earth-size exoplanet about 90 light-years away covered with volcanoes
https://www.nasa.gov/feature/goddard/20 … size-world

Mars_B4_Moon

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Posts: 9,776

Re: Extrasolar Habitable Planets

The 10 most Earth-like exoplanets

https://www.space.com/30172-six-most-ea … anets.html

Mars_B4_Moon

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Posts: 9,776

Re: Extrasolar Habitable Planets

SOFIA Helps Reveal a Destroyed Planetary System

https://spaceref.com/science-and-explor … ry-system/

Mars_B4_Moon

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Posts: 9,776

Re: Extrasolar Habitable Planets

Science, History, Scifi Speculation and Futurist ideas with Isaac Arthur

The Fermi Paradox: Galactic Habitable Zones

https://www.bitchute.com/video/HI8Zg4vC5II/

Mars_B4_Moon

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Registered: 2006-03-23

Posts: 9,776

Re: Extrasolar Habitable Planets

Using NASA's Transiting Exoplanet Survey Satellite (TESS), an international team of astronomers has discovered a new hot, bloated "super-Neptune" exoplanet. The newfound alien world, designated TOI-2498 b, is about six times larger and 35 times more massive than the Earth.

https://phys.org/news/2023-05-super-nep … -tess.html

https://arxiv.org/abs/2305.06950

Mars_B4_Moon

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Posts: 9,776

Re: Extrasolar Habitable Planets

The Pillars of Creation's columns shroud fledgling stars just being formed. Red and blue dots are new stars that give off copious amounts of X-rays. chandraxray's data is combined here with NASAWebb's infrared for a more complete – and beautiful – view.

https://twitter.com/NASAExoplanets/stat … 5963040768

Chandra X-ray Observatory (CXO), previously known as the Advanced X-ray Astrophysics Facility was launched aboard the Space Shuttle  by NASA in year 1999. NASA's series of Great Observatories satellites are four large, powerful space-based astronomical telescopes launched between 1990 and 2003 including Compton, Spitzer and the Hubble, instruments to detect cosmic observation of X-rays were taken to high altitude by balloons, sounding rockets, and orbiting space telescope satellites. It would be interesting to see other X-ray observations of exoplanets, nebulae and circumstellar disks ESA's XMM-Newton, China's HXMT, Japan's Suzaku and NASA's NuSTAR, Neil Gehrels Swift Observatory and  IXPE also observe in X-ray.

Last edited by Mars_B4_Moon (2023-05-27 14:44:20)

Mars_B4_Moon

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Re: Extrasolar Habitable Planets

One-third of galaxy's most common planets could be in habitable zone

https://phys.org/news/2023-05-one-third … table.html

Mars_B4_Moon

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Re: Extrasolar Habitable Planets

Elusive planets play "hide and seek" with CHEOPS

https://www.spacedaily.com/reports/Elus … S_999.html

ESA's exoplanet mission Cheops confirmed the existence of four warm exoplanets orbiting four stars in our Milky Way. These exoplanets have sizes between Earth and Neptune and orbit their stars closer than Mercury our Sun.

These so-called mini-Neptunes are unlike any planet in our Solar System and provide a 'missing link' between Earth-like and Neptune-like planets that is not yet understood. Mini-Neptunes are among the most common types of exoplanets known, and astronomers are starting to find more and more orbiting bright stars.

Mars_B4_Moon

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Re: Extrasolar Habitable Planets

A new bigger JWST style telescope for direct exoplanet observations

Perhaps the tech isn't there yet for a visible-wavelength telescope larger than JWST

https://www.youtube.com/watch?v=eXchT7mtEao

Large UV/Optical/IR Surveyor (LUVOIR)

and 'Quantum Telescopes' at mega pixel resolution

Mars_B4_Moon

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Re: Extrasolar Habitable Planets

Astronomers observe giant tails of helium escaping Jupiter-like planet

https://www.spacedaily.com/reports/Astr … t_999.html

If Earth is our model for seeking evidence of life on exoplanets, we must learn to detect biosignatures from a planet that resembles our world. We also must try to recognize life signs on planets that resemble Earth’s very distant past, conditions that enabled life to form.

https://twitter.com/NASAExoplanets/stat … 1695971328

Last edited by Mars_B4_Moon (2023-06-14 12:44:34)

Mars_B4_Moon

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Re: Extrasolar Habitable Planets

We Could See the Glint off Giant Cities on Alien Worlds

https://www.universetoday.com/161997/we … en-worlds/

Mars_B4_Moon

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Re: Extrasolar Habitable Planets

A New Tatooine-like multi-planetary System Identified
https://spaceref.com/science-and-explor … dentified/
An international team of astronomers has announced the second-ever discovery of a multiplanetary circumbinary system.

Circumbinary systems contain planets that orbit around two stars in the centre instead of just one, like in our Solar System. Circumbinary planets orbit around both stars at once. The discovery, led by researchers at the University of Birmingham, is reported in today’s issue of the journal Nature Astronomy.

The newly discovered planet is called BEBOP-1c, after the name of the project that collected the data. BEBOP stands for Binaries Escorted By Orbiting Planets. The BEBOP-1 system is also known as TOI-1338.

In 2020, a circumbinary planet, called TOI-1338b, was discovered in the same system using data from NASA’s TESS space telescope, to which the Birmingham team also contributed. That planet was discovered with the transit method and was noticed because it passed in front of the brighter of the two stars on several occasions.

“The transit method permitted us to measure the size of TOI-1338b, but not its mass which is the planet’s most fundamental parameter,” said lead author Dr Matthew Standing, who completed his PhD at the University of Birmingham and is now a researcher at The Open University.

The BEBOP team was already monitoring this system using another detection method at the time, called the Doppler method. This method, also called the wobble method, or radial-velocity method, relies on accurately measuring the velocity of stars.

“This is the same method that led to the first exoplanet detection, for which Mayor and Queloz received the Nobel Prize in 2019.” said Matthew’s then supervisor, Amaury Triaud, a professor at the University of Birmingham.

Using state-of-the-art instruments installed on two telescopes located in the Atacama Desert in Chile, the team attempted to measure the mass of the planet noticed by TESS. Despite their best efforts, and years of work, the team could not achieve that, but instead they discovered a second planet, BEBOP-1c and measured its mass.

“Only 12 circumbinary systems are known so far, and this is only the second that hosts more than one planet,” said David Martin, an astronomer and Sagan Fellow at the Ohio State University.

“BEBOP-1c has an orbital period of 215 days, and a mass 65 times larger than Earth, which is about five times less than Jupiter’s mass,” continues Dr Standing. “This was a difficult system to confirm, and our observations were interrupted by the COVID pandemic when telescopes in Chile closed for six months during a critical part of the planet’s orbit. This part of the orbit only became observable again last year, when we finalised the detection.”

Mars_B4_Moon

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Re: Extrasolar Habitable Planets

New era of exoplanet discovery begins with images of 'Jupiter's Younger Sibling'

https://www.spacedaily.com/reports/New_ … g_999.html

Mars_B4_Moon

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Re: Extrasolar Habitable Planets

A Direct Image of a Planet That’s Just Like Jupiter, Only Younger

https://www.universetoday.com/162216/a- … y-younger/

In a recent study published in The Astrophysical Journal Letters, a team of astronomers used the W. M. Keck Observatory on Maunakea, Hawaii Island to identify exoplanet, AF Lep b, which is three times the mass of Jupiter orbiting a Sun-sized star located approximately 87.5 light-years from Earth.

Mars_B4_Moon

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Re: Extrasolar Habitable Planets

'Like a mirror': Astronomers identify most reflective exoplanet

https://phys.org/news/2023-07-mirror-as … lanet.html

Mars_B4_Moon

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Re: Extrasolar Habitable Planets

Two Stars Orbiting Each Other So Closely They Could Fit Inside the Sun

https://www.universetoday.com/162692/tw … e-the-sun/

Astronomers have discovered a pair of star-like objects orbiting each other extremely quickly, with an entire ‘year’ lasting just 1.9 Earth hours. Catchily named ZTF J2020+5033, the system consists of one object which is definitely a small star, and another that straddles the boundary between star and planet. The two objects appear to be very old, and understanding how they came to be orbiting so close together is teaching astronomers more about how solar systems change and evolve.

Mars_B4_Moon

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Re: Extrasolar Habitable Planets

Exoplanets in the Trappist-1 system more likely to be habitable than scientists once thought, study suggests

https://www.space.com/trappist-1-exopla … have-water

Void

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Re: Extrasolar Habitable Planets

Well, this is useful information: https://www.msn.com/en-us/news/technolo … 69cf7&ei=9  Quote:

Charged particles of strongly magnetic cool stars could reach speeds up to five times greater than the average speed of our Sun's solar wind. In other words, exoplanets orbiting those cool stars are subject to stellar winds traveling as fast as 5 million miles per hour.

Well, this is an example of seeing how some place is not like out place is.  It does not look at advantages for small stars.

I see two.  Small planet without atmosphere near its star.  Very Cold Terrestrial planet or Moon.

Proxima Centauri may have some of these things: https://en.wikipedia.org/wiki/Proxima_Centauri

d

d    ≥0.26±0.05 M?

A small world like that, near its star and stripped of atmosphere could be very good, as the dark side or poles may have volatiles.  With mass driver technology, it could be a source of many synthetic gravity worlds.

b

b    ≥1.07±0.06 M?

This may lack atmosphere as well and would be debatable if it is very useful as you would have 'd'.

c

c (disputed[61][62])    7±1 M?

If it exists it might be a Hycean Planet, but really not very useful except for its presumed atmosphere.
But if it had a moon the size of Titan, it might be possible to do something with that.  That possible moon of a possible planet, might be very cold, but might be protected by a magnetic field from 'c'.

Presuming a civilization that can cross star gaps, cold Titans and Cold Earth's might be very desirable.

There is no evidence for a Cold Earth or Mars around Proxima Centauri, but they might be rather hard to detect.

But they would only have to be as warm as Titan or even perhaps Pluto, to have a useful Nitrogen atmosphere.  Again cold worlds like this might be very valuable for a people with abundant energy sources.

There are an enormous number of red and orange stars, and they may host things like I have mentioned.

Crossing the gap between stars almost requires a vast energy source, maybe Fusion so having a vast energy source cold Titans and Earths, and Mars worlds may be very suitable.

And small airless worlds near the star may also provide a useful situation.

Done

Last edited by Void (2023-08-15 12:34:18)

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