TRAPPIST-1e - Unraveling an Exoplanet's Ocean Potential

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Okay, let's unpack this.

Imagine looking up at the night sky and pointing to a tiny, distant speck forty light years away and asking, could there be liquid water? There? Could there be an atmosphere? That's exactly the cosmic adventure we're embarking on today. We're diving deep into the mystery surrounding an Earth sized exoplanet

And what's really fascinating here is that this isn't just about you know, spotting a distant spec It's about meticulously piecing together the precise conditions that could support liquid water, that most fundamentally ingredient for life as we know it. So, yeah, we're going to explore how scientists are using the most powerful telescope ever built to try and detect these all these faint whispers of an atmosphere and what those whispers or maybe their absence might tell us about this really

So what exactly is this enigmatic planet E that has scientists so incredibly excited.

Let's start there.

You know, when we talk about exoplanets, often we're dealing with worlds that are just just barely detectable, think blips in the data. But trapp Is One, well, it's an Earth size exoplanet orbiting a star forty light years away. Now forty light years sounds enormous, and it is something like two hundred and thirty five trillion miles, but in

Right, it's close enough to get a good look, relatively speaking, And it's not just its closeness, is it. The whole system it's in is pretty special.

Absolutely, Planet E isn't alone out there. It's one of seven Earth sized planets all packed quite tightly around a star called trapp Is One. Now trapp Is One isn't like our sun at all. What we call a red dwarf star, much smaller, much cooler, and dimmer than our familiar yellow dwarf sun. Think about a star that's maybe only about eight percent the mass of our Sun, barely larger than the planet Jupiter. Wow, that's yeah, really small

So Planet EE must be orbiting incredibly close to Trappis one to be in that zone. Does that mean it gets baked.

Or that's the interesting part. It is incredibly close. Planet E whips around its star in just six point one earth days.

That's its year, six days, six days.

Compare that to our three sixty five. But because Trappis one is so much cooler, so much dimmer than our sun, Plant E actually receives a similar amount of stellar energy to Earth. So this puts it squarely within that critical habitable zone. Temperatures are theoretically just right for liquid water, not so hot it boils away, and not so cold it's permanently frozen solid.

And it's this initial draw the potential for liquid water, combined with its Earth like size, that immediately made Trappis one a top tier target for well for astrobiology research.

Okay, so it ticks the big boxes, Earth sized in the habitable zone. That sounds like the perfect recipe. But you keep saying theoretical viability. What's the catch, what's the big uncertainty?

You've nailed it.

That's the absolutely critical point and a common misconception when people hear habitable zone. While Trappist one m really does stand out its size, its position, the presence of liquid water isn't guaranteed at all, not by a long shot. It hinges entirely on one huge, still unanswered question, does planet actually have an atmosphere?

Ah?

Right, the at.

Without an atmosphere, even in that sweet spot orbit, a planet's surface conditions could be completely hostile. You'd get wild temperature swings between the side facing the star and the side facing away. Any surface water could just boil off or freeze, or even subtle meate turns straight from mice to gas and just get lost to space over time. And this brings us right to the big mystery that the astrophysicists at the University of Bristol and a large

It's truly astonishing that we can even try to detect an atmosphere on a planet forty light years away. I mean, how on Earth, or rather how off Earth does a telescope like JWSTEAM manage that sifting through all that starlight?

What's the biggest challenge there?

It is an incredible feed, and you're right, the challenges are immense. Think about it.

We're essentially trying to find the tiny chemical signature of a planet's air, a world completely dwarfed by its star from trillions of miles away. This is where NASA's James Webspace Telescope, the JWST comes in. It's not just another telescope. It's genuinely changing the game in exoplanet research. It's part of a major international collaboration too. You can think of it as humanity's most sensitive eye, specifically tuned to see in the infrared to see what was previously hidden from us.

And it uses a specific instrument for this job, doesn't it the ni RESPEC exactly.

Scientists are using one of JWST's workhorse instruments, ni I RESPEC, the Near Infrared spectrographs NOW in I respect, isn't just splitting light like a simple prism. It's incredibly sensitive and specifically designed for the near infrared part of the spectrum, and that's crucial because that's the wavelength range where molecules we care about, like water, vapor, carbon dioxide, methane, leave their most distinct chemical fingerprints.

Oh okay, and it's especially.

Vital for looking at planets around cool red dwarf stars like trap Is to one, because these stars emit most of their life in the infrared, so it means any faint atmospheric signals are relatively speaking easier for JAST to read against the star's background infrared light compared to trying to see them invisible light, where a star like our

So how do they actually use enerspect to do this? They can't just point it at the planet and see clouds, can they?

No, not directly like that. It relies on a really clever technique called the transit method. Picture this from our viewpoint here on Earth, or rather from JWST's viewpoint in space. Planet E occasionally passes directly in front of its host star, Trappist One. This is called a transit. As it does, it blocks a tiny, tiny fraction of the star's light, causing a very slight dip in the star's overall brightness. That's actually how we often find these exoplanets in.

The first place.

Okay, I've heard of that, the dip in's starlight, right.

But here's a really ingenious part for studying atmospheres. Just as the planet starts to cross or finishes crossing, some of the starlight grazes the edge of the planet. If the planet has an atmosphere, that starlight passes through the upper layers of that atmosphere on its way to us.

Ah.

Okay, the starlight gets.

Filtered, exactly filtered. The chemicals present in.

That atmosphere, if one exists, will absorb very specific wavelengths, specific colors of that starlight. Every molecule like water or CO two, has a unique absorption pattern, like a fingerprint or barcode in the infrared spectrum. So by carefully analyzing the starlight during these transits, using narspect to spread the light into its full spectrum, astronomers can look for these

That's absolutely incredible.

It really sounds like the JAWST specific infrared capabilities are the game changer here.

They truly are.

Doctor Hannah Wakeford, who is an associate professor in astrophysics at the University of Bristol and a key member of this JWST Transitting exoplanet team. She was instrumental in designing the actual observational setup for the telescope. That kind of meticulous planning is vital to make sure they get the

You can really feel the excitement.

Oh absolutely.

She also said, it's incredibly exciting to be peeling back the curtain on these fascinating other worlds, measuring the details of starlight around Earth sized planets to ascertain what it might be like if life could be possible.

Right.

As she mentioned, it's this careful process of elimination and comparison that's leading to these great new insights really shifting our understanding of planetary science. It's just a stunning testament to human ingenuity, isn't it our drive to explore? Lets us ask and now start to answer questions that we're pure science fiction, just a generation to go, this technological

So, after all that incredible BEATA collection, all that painstaking analysis, what does it actually mean for planetes potential atmosphere? What are the headlines coming out of these first observations the big reveals.

Well, the initial results are now published actually across two fevored papers in the Astrophysical Journal Letters. Yeah, well they're fascinating, but also, as science often is quite nuanced and cautiously presented, they're definitely what they call hints of an atmosphere. That's a key.

Phrase, and it's okay, not a slam dunk yet.

Not a slam dunk now, to be really precise here, as doctor Wakeford explained, the possibility that there's simply nothing there, no significant atmosphere at all can't be completely ruled out just yet based on this initial data. It's very much a careful process of elimination like cosmic detective work unfolding

Okay, so what isn't it?

What have they managed to definitively rule out with these first JWST looks.

This is actually one of the most definitive findings so far, real revelation. The researchers are pretty confident that planet E does not have its original primordial atmosphere.

It's original atmosphere.

Yeah, this is a really crucial piece of the puzzle. It immediately crosses off a major possibility and tells us something fundamental about the planet's history and its environment. To unpack that a bit, we're talking about what's called a primordial hideen based atmosphere. This is basically the initial gas envelope mostly hydrogen and helium that a planet gathers from the disc it forms in. Think of it as the

So like baby Earth might have had one of these fluffy hydrogen atmospheres.

That's the idea, yes, But for Planet E, the JWST data strongly suggests this isn't the case anywhere it's gone. Doctor David Grant, who was a senior research associated Bristol and a co author, explained why. He pointed out that trappist One, the parent star, is a very active star with frequent flares. Ah the star itself is the culprit.

It would have just.

Stripped off by stellar radiation. Any light easily removed gases like hydrogen and helium, so that initial primordial atmosphere, if it ever had one, would likely have been blown away into space relatively early in the planet's history. It's a harsh place to grow up orbardly.

Speaking, right, that makes sense A very active star would make it hard to hold onto light gases. So if it doesn't have its primordial atmosphere, does that just mean it's a barren rock now or is there another possibility?

And this is where it gets really interesting and hopeful. This leads us directly to the concept of a secondary atmosphere. Doctor Wakeford pointed this out specifically. She noted many planets, including Earth, build up a heavier secondary atmosphere after losing their primary atmosphere.

Like Earth did.

Exactly like Earth did, our early hydrogen helium atmosphere was lost too, but then over millions billions of years, processes like volcanic outgasing released heavier gases from the planet's interior, things like carbon dioxide, water, vapor, nitrogen, and then, of course life eventually reshaped or atmosphere dramatically by adding oxygen.

Okay, So if Planet E does manage to have that secondary atmosphere, that heavier one, what's the next domino to fall in this whole cosmic puzzle. Does that automatically mean liquid water because that seems to be the holy grail here.

That's exactly right. The potential for liquid water is the next crucial link in the chain. And yes, if a secondary atmosphere exists, then liquid water could certainly persist on the surface, and if that's the case, researchers are pretty confident it would almost certainly require and be accompanied by a greenhouse effect, something basically similar in principle to what happens here on Earth.

The greenhouse effect keeping it warm enough.

Exactly certain gases in that atmosphere. Carbon dioxide is a prime candidate, but maybe methane or water vapor too, would trap some of the heat radiating for the planet's surface, heat that originally came from the star. This trapped heat keeps the planet warmer than it would be otherwise, and critically it helps stabilize the temperature, ending all the water

Now, when we hear a greenhouse effect, a lot of us immediately picture Venus right with that incredibly thick runaway carbon dioxide atmosphere and surface temperatures hot enough to melt lead.

Is that the kind of scenario we might be looking at for Planet E.

That's a really important question, and it's vital we add some nuance there. The lead author on the theoretical interpretation paper, doctor Anna Glidden from MIT, specifically addressed this. She explained that based on their modeling and the current data, it is unlikely the atmosphere of planet E is dominated by carbon dioxide like the thick atmosphere of Venus and the thin atmosphere of Mars.

Okay, so not like Venus, whew, and not like Mars either.

Apparently not dominated by CO two in the way either of those are, which suggests something potentially different. Doctor Glidden also emphasized, but it's also important to note there are no direct parallels with our solar system. Trappist One is a very different star from our Sun, and the planetary system around it is also distinct. That's a really key takeaway. We're dealing with an alien solar system, an alien star. We shouldn't expect things to look exactly like Earth, Venus

Okay, so maybe not Venus like, maybe not Mars like, but some CO two could still be really important, couldn't it for that warming effect?

Precisely, even if CO two isn't the main component, it could still play that crucial greenhouse role. And doctor Wakeford added a very encouraging detail on this point. She said, a little greenhouse effect can go a long way. And the new measurements do not rule out sufficient carbon dioxide to sustain some liquid water on the surface.

Ah not ruled out. That sounds significant.

It is significant in scientific terms. It means the observations we have so far are still perfectly consistent, whether it being enough CO two or perhaps other greenhouse gases to keep the surface temperature above freezing at least in some places. It means the possibility of liquid water enabled by a modest greenhouse effect remains firmly on the table based on

Perpetual noon surrounded by ice.

That sounds incredibly bizarre, like an eyeball staring at the star.

I think I've heard that term eyeball planet.

That's exactly the concept the eyeball, or sometimes lava lamp ocean configuration, and as a direct consequence of something called tidal locking.

Tidal locking like our moon.

Decisely like our moon because the trapis one planets are relatively large compared to their small star, and because the orbits so incredibly close, the star's gravity has locked their rotation. What this means is that one side of Planet E always faces the star, experiencing perpetual daylight, while the other side is permanently turned away, plunged into perpetual darkness and cold.

Wow, a permanent day side and a permanent night side.

Exactly Unlike Earth, which rotates, distributing heat more evenly, Planet E would have this stark contrast. So if liquid water exists, the most likely place for it to pool and persist would be on that permanently warm day side. Maybe concentrated near the point directly facing the star, the substellar point.

That paints such a drastically alien picture, not Earth two point zero, but something entirely different. What would the conditions even be like near that ocean?

Oh, incredibly dramatic. Most likely imagine constant, perhaps hurricane force winds blowing from the hottest point under the star towards the colder twilight regions and the night side. Driven by that massive temperature difference. These winds would likely drive strong ocean currents. Within that eyeball sea. You might have intensive operation under the star, leading to thick clouds, maybe perpetual

It really forces you to think outside the box about what habitable even means, doesn't it.

It absolutely does? How would life adapt could something live in the boiling center or the freezing edges, or find a niche in that twilight zone. Maybe life exists under the ice on the dark side, warmed by geothermal heat. The fact that these initial Jawst findings are still consistent with enough greenhouse gases to make any surface liquid water are possible even in this strange eyeball configuration is what

This really does feel like just the beginning, doesn't it. This deep dive into Trappis one m is clearly far from over. These initial findings, these hints are just paving the way for more. It feels like we found the first few pieces of this incredibly complex and captivating cosmic puzzle. But maybe those pieces just raise even more questions. So what's next? What's on the cosmic research agenda for Planet E?

You're absolutely right, this is very much just the first chapter. The quest to understand Planet E is an ongoing process. The immediate next steps involved well more data, more observations they need to build on these initial four transit observations. The more times they can watch planet ePass in front of trap this one, the more starlight they collect passing through its potential atmosphere. This will strain than the signal

They will also.

Compare its data very closely with data from another planet in the same system, Trappist one B.

Planet B, the one even closer to the star.

That's the one Planet B orbits closest to the star, so it gets blasted with even more intense radiation. It's likely lost any atmosphere it might have had, even more readily than Planet E. By comparing the atmospheric signals or lack thereof, from both planet B and Planet E, scientists can get a much better handle on the processes of atmospheric loss and retention across the whole system. How does

That sounds like a truly monumental undertaking. It must involve a huge team. Who are the people behind this kind of groundbreaking research.

It really does highlight the scale and the collaborative nature of modern astrophysics. Doctor Nestor Espinoza, who's an associate astronomer at the Space Telescope Science Institute, the place that operates JWST and one of the principal investigators focusing on trappis

The data needed.

It's part of a bigger program.

Isn't it?

Yes, exactly, The whole problem is part of a larger JWST initiative called the Dreams program that stands for trappis one m survey team detailed research for exoplanetary atmospheres and mass loss studies.

Quite a mouthful. It's a massive collaborative effort led by doctor Nicole Lewis, who's an associate professor over at Cornell University, and it's truly international. We're talking more than thirty scientists involved from the UK, the US and India, including, as you might expect, several current and former members of doctor Wakeford's team at Bristol. It really showcases that global effort needed to tackle these big questions.

And this team they have a pretty strong track record already with JWST, don't they. I think I remember hearing about another big discovery they made.

You're absolutely right. This group has already made headlines. They had that breakthrough detection of quartz clouds made of tiny sand like particles in the atmosphere of a different, very hot exoplanet that was published back in twenty twenty three study led by doctor Grant, the same research we mentioned earlier and co authored by doctor Wakeford. So yes, this prior success really underscore the caliber of the team and

So we've journeyed forty light years in our minds today, peered through starlight using the most advanced telescope humanity has ever built, and we found these compelling hints, this tantalizing clues, clues that an Earth's size exoplanet Trapeze T one might just hold on to a secondary atmosphere, and if it does well, then the potential for liquid water follows, maybe a global ocean, maybe that strange sunkissed eyeballpool on a tidally locked world. This isn't just a story about a

And what's truly fascinating here, I think, is how these discoveries, even these tentative hints from worlds like Trappist one, they really compel us to rethink our most basic assumptions about where life could emerge in what forms it might take.

Absolutely our really powerful thought to end on. Thank you so much for sharing your expertise on this deep dive today, and thank you our listener for joining us. Keep looking up, keen asking those big questions, and we'll see you on the next cosmic Adventuress.

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