Exoplanets Archives

December 18, 2023December 18, 2023 by Andy Tomaswick

Astronomers Scan Hundreds of Stars for “Anomalous Transits”

Telescopes have been collecting copious amounts of data on exoplanets in recent years. One of the most common datasets tracks what are known as “transits,” where an exoplanet crosses in front of its host star and dims the star’s light slightly as it does so. The majority of exoplanets have been found this way, but other interesting details might be hidden in the data. For example, what would it mean if the transits happened in a way that disagreed with typical Newtonian physics? One answer to that question is that there might be an intelligent force behind the discrepancy – and that’s what a group of researchers at Breakthrough Listen began looking for in a paper recently published on arXiv.

December 15, 2023December 16, 2023 by Evan Gough

17 Known Exoplanets Could Have Oceans of Liquid Water

Astrobiologists believe that the Solar System's ice worlds are some of the most interesting places to search for life. These are moons or dwarf planets with thick ice shells surrounding oceans of liquid water - the perfect habitats for life. A new NASA study has found 17 exoplanets that have the right size, density and distance from their stars, and are probably similar to Europa or Enceladus and might even have geysers blasting water into space. Image Credit: NASA

The search for life is tied to the search for liquid water. That’s why astronomers are so keen on detecting rocky, Earth-like exoplanets in their stars’ habitable zones. In a habitable zone, a planet receives enough energy from its star to maintain liquid water on its surface, given the right atmospheric conditions.

But in our Solar System, we’ve found worlds with liquid water that are way beyond the habitable zone. Can we do the same in other solar systems?

December 15, 2023December 15, 2023 by Mark Thompson

What’s the Source of Binary Rogue Planets?

The James Webb Space Telescope (JWST) is already making great strides in helping us to unravel the mysteries of the Universe. Earlier this year, hundreds of rogue planets were discovered in the Orion Nebula. The real surprise to this discovery was that 9% of the planets were paired up in wide binary pairs. To understand how this binary planets formed, astronomers simulated various scenarios for their formation.

December 14, 2023December 15, 2023 by Laurence Tognetti

A Tiny Telescope is Revealing “Hot Jupiter” Secrets

CUTE spacecraft and an artist's impression of a hot Jupiter. (Credit: NASA/JPL, University of Colorado)

A recent study presented this week at the 2023 meeting of the American Geophysical Union discusses observations of “hot Jupiters” from the NASA-funded CubeSat mission known as the Colorado Ultraviolet Transit Experiment (CUTE). Unlike most exoplanet-hunting telescopes, whose sizes are comparable to a small school bus, CUTE measures 36 centimeters (14 inches) in length, equivalent to the size of a cereal box. These findings come after members of the team, which consists of undergraduate and graduate students, published an overview paper about CUTE in The Astronomical Journal in January 2023 and results from CUTE observing WASP-189b in The Astrophysical Journal Letters in August 2023.

December 12, 2023December 12, 2023 by Mark Thompson

Planets Orbiting Pulsars Should Have Strange and Beautiful Auroras. And We Could Detect Them

Artist's impression of auroras on a planet orbiting a pulsar

We have been treated to some amazing aurora displays over recent months. The enigmatic lights are caused by charged particles from the Sun rushing across space and on arrival, causing the gas in the atmosphere to glow. Now researchers believe that even on exoplanets around pulsars we may just find aurora, and they may even be detectable.

December 11, 2023December 11, 2023 by Evan Gough

Exomoons Defy Discovery

So far we only know of two exoplanets with candidate exomoons. But even those two may be false positives. Image Credit: NASA

For a long time, we wondered if other stars hosted planets like the Sun does. Finally, in the 1990s, we got our answer. Now, another question lingers.

Most of the planets in our Solar System have moons. Do exoplanets have exomoons?

December 11, 2023December 11, 2023 by Nancy Atkinson

Amateur Astronomers Found Planets Crashing Into Each Other

Artist impression of two colliding planets.

Astronomy is one of the sciences where amateurs make regular contributions. Over the years, members of the public have made exciting discoveries and meaningful contributions to the scientific process, either through direct observing, citizen science projects, or through combing through open data from the various space missions.

Recently, amateur astronomer Arttu Sainio saw a conversation on X (Twitter) where researchers were discussing the strange behavior of a dimming sun-like star. Intrigued, Arttu decided to look at the data on this star, called Asassn-21qj, on his own. Looking at archival data from NASA’s NEOWISE mission, Sainio was surprised to find that the star had dimmed before, with an unexpected brightening in infrared light two years before the optical dimming event. So, he joined the discussion on social media and shared his finding – which led to more amateurs joining the research, which lead to an incredible discovery.

December 6, 2023December 6, 2023 by Evan Gough

ESA’s Ariel Mission is Approved to Begin Construction

An artist's impression of the ESA's Ariel space telescope. It'll examine 1,000 exoplanet atmospheres. Image Credit: ESA

We’re about to learn a lot more about exoplanets. The ESA has just approved the construction of its Ariel mission, which will give us our first large survey of exoplanet atmospheres. The space telescope will help us answer fundamental questions about how planets form and evolve.

December 6, 2023December 6, 2023 by Evan Gough

Astronomers Calculate Which Exoplanets Are Most Likely to Have Water

This illustration shows what the hot rocky exoplanet TRAPPIST-1 b could look like. A new method can help determine what rocky exoplanets might have large reservoirs of subsurface water. Credits: NASA, ESA, CSA, J. Olmsted (STScI)

Astronomers know of about 60 rocky exoplanets orbiting in the habitable zones of their stars. When they try to determine how habitable these planets might be, detecting water in their atmospheres plays a huge role. But what if there was another way of measuring the water content in these worlds?

Researchers are developing a way of modelling these worlds to determine how much water they have.

December 5, 2023December 5, 2023 by Evan Gough

This Planet is Way Too Big for its Star

This artist's illustration shows what the star LHS 3145 might look like from the surface of its planet, LHS 314b. Image Credit: Penn State / Penn State. Creative Commons

Scientists love outliers. Outliers are nature’s way of telling us what its boundaries are and where its limits lie. Rather than being upset when an outlier disrupts their understanding, scientists feed on the curiosity that outliers inspire.

It’s true in the case of a new discovery of a massive planet orbiting a small star. That goes against our understanding of how planets form, meaning our planet-formation model needs an update.