GJ 9827 d, an exoplanet situated approximately 98 light-years away, has captured the attention of astronomers as the smallest exoplanet identified to date that possesses water vapor in its atmosphere. With a diameter nearly twice that of Earth, questions arise regarding its composition—could it closely resemble our planet? Do its atmospheric conditions include a substantial amount of water vapor indicative of a rocky, Earth-like environment, or is it enveloped in a hydrogen-dominated atmosphere that suggests a classification as a mini-Neptune?

Recent observations made with the Webb Space Telescope have provided significant insights into GJ 9827 d’s atmosphere, revealing a notable presence of water vapor. This finding bolsters the hypothesis that this exoplanet may be classified as a “steam world,” more akin to rocky planets like Earth than traditional gas giants.

Caroline Piaulet-Ghorayeb and her team at the University of Montreal’s Trottier Institute for Research on Exoplanets (IREx) reported their groundbreaking findings, which were published in The Astrophysical Journal Letters on October 4, 2024.

Insights from Observational Data

Earlier this year, astronomers utilizing the Hubble Space Telescope detected water vapor on GJ 9827 d, sparking a debate about whether the planet fits the criteria for a super-Earth or a mini-Neptune. Super-Earths, which are rocky planets larger than Earth yet smaller than Neptune, while mini-Neptunes have substantial hydrogen-rich atmospheres. Although neither type exists in our solar system, they have been frequently identified in distant star systems across our galaxy.

Piaulet-Ghorayeb stated, “Currently, the planetary atmospheres we’ve observed are predominantly those of giant planets or mini-Neptunes, characterized by hydrogen-rich environments. These atmospheres align more closely with gas giants than with terrestrial planets like Earth, which have atmospheres dominated by heavier elements.”

A Unique Composition

What sets GJ 9827 d apart is its atmosphere, which Webb has determined consists of heavier elements along with abundant water vapor, making it more similar to terrestrial bodies. “Its molecular composition is akin to carbon dioxide or nitrogen-rich atmospheres that we are actively searching for on smaller rocky planets, where we may eventually seek signs of life,” Piaulet-Ghorayeb explained.

Related: The James Webb Space Telescope: Achievements and Challenges

Using the Near-Infrared Imager and Slitless Spectrograph (NIRISS)—a Canadian instrument aboard the Webb—researchers analyzed the light emitted by the planet’s star during the planet’s transit across it. By combining observations from both Hubble and Webb, they were able to confirm the presence of water vapor and additional spectral features in the planet’s atmosphere, ruling out the possibility of data contamination from the stellar light.

Implications for Habitability

While the detection of considerable water vapor on GJ 9827 d is a monumental achievement in exoplanetary studies, the prospect of this planet being habitable is quite slim. Its high temperature, approximately 660 degrees Fahrenheit (350 degrees Celsius), due to its close orbit to its star, suggests that the water vapor is likely in the form of steam.

Nevertheless, these findings are significant, indicating that smaller exoplanets can indeed have atmospheres resembling those of Earth rather than the gas- or ice-dominated atmospheres found on larger planets. Piaulet-Ghorayeb concluded,

“This is a remarkable step forward in our quest to investigate atmospheres surrounding smaller, terrestrial-like planets. GJ 9827 d represents the first exoplanet on which we’ve identified an atmosphere rich in heavier molecules, marking an exciting confirmation of the theoretical concept of a ‘steam world.’”

Astronomers utilizing the Webb Space Telescope have established that the exoplanet GJ 9827 d harbors more water vapor than previously believed, classifying it as a steam world. This discovery enhances our understanding of the diversity of exoplanetary atmospheres and lays the groundwork for future explorations aimed at finding potentially habitable worlds beyond our solar system.

Sources:

https://iopscience.iop.org/article/10.3847/2041-8213/ad6f00

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Mohsin Rasheed

Co-Founder & Chief Editor of Everyman Science. I view science not just as a collection of facts, but as the ultimate guide for human survival. From medical breakthroughs to the logistics of space exploration, I am dedicated to documenting how scientific reasoning uplifts the human spirit and provides the blueprints to save our planet. I believe that by unleashing the power of nature through disciplined inquiry, we can secure a sustainable future for humanity.

The post JWST Detects Water Vapor on the Smallest Exoplanet Yet appeared first on Everyman Science.

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I will delve into the details of NASA’s latest laser communications program. In addition, I will explore other space and communications projects that are similar in nature. The progress made in laser data transfer technologies is truly remarkable.

NASA’s Laser Communications System

So, how does the NASA laser communications system work? The development of laser communications technology by the National Aeronautics and Space Administration began in December 2021. The Laser Communications Relay Demonstration (LCRD), however, required an additional system to create a complete end-to-end solution. In 2023, NASA plans to launch the Integrated LCRD Low Earth Orbit User Modern and Amplifier Terminal (ILLUMA-T) to the International Space Station. The Space Communications and Navigation (SCaN) program will then conduct the demonstration using ILLUMA-T and LCRD, utilizing invisible infrared light to achieve higher data rates than previous space communications systems. The success of this trial will enable NASA to transmit more images and videos from its space missions to Earth, benefiting expeditions within low orbit distances.

Advantages and Potential of Laser Communications

According to Matt Magsamen, deputy project manager for ILLUMA-T, the terminal will be capable of sending high-resolution data, including pictures and videos, to LCRD at a rate of 1.2 gigabits-per-second. From there, the data will be transmitted from LCRD to ground stations in Hawaii and California. This demonstration will showcase the advantages of laser communication for missions in low Earth orbit. By offering increased flexibility and faster data transmission from space, laser communications have the potential to enhance future missions. As Badri Younes, former deputy associate administrator for NASA’s SCaN program, states, “We are integrating this technology on demonstrations near Earth, at the Moon, and deep space.” The efficiency and reduced weight of laser communications systems make them ideal for spacecraft design. The ILLUMA-T is approximately the size of a typical refrigerator and will be attached to an external module on the ISS. Eventually, laser communications will work alongside radio frequency systems, allowing us to receive and analyze data from space more quickly.

Other Laser Communications Projects

But what about other laser communications projects? NASA acknowledges that the ILLUMA-T and LCRD are not the first advancements in this field. For example, the Lunar Laser Communications Demonstration, which dates back to 2014, relayed information between lunar orbit and Earth. The Optical Payload for Lasercomm Science, developed in 2017, demonstrated the ability of lasers to significantly increase data rates compared to radio signals for communication between Earth and space. Last year, the TeraByte InfraRed Delivery System began testing laser communications on a small CubeSat in low Earth orbit. Laser communications also hold promise for future Moon, Mars, and deep space missions.

Laser Communications on Earth

It is interesting to note that laser communications research has also made progress here on Earth. Alphabet, Google’s parent company, has been working on a new form of internet connectivity that employs lasers. This innovation, known as Project Taara, utilizes light to transmit information at high speeds through the air in a narrow, invisible beam. The aim is to address the lack of internet connectivity in remote rural areas, where traditional cable networks are impractical and costly. Transmitters equipped with lasers send data to receivers, which decode and convert the information into bytes. Project Taara has already been deployed in Africa and India, with the potential for expansion to other countries in the future.

Final words

NASA’s laser communications system will undergo testing on the International Space Station. By utilizing infrared beams, this system has the capability to transmit and receive data at a much higher rate than previous technologies. This advancement has the potential to revolutionize the way we send information from space missions back to Earth, as well as improve communication in general. Combining the innovations of NASA and Google’s Project Taara could lead to even more powerful and efficient communication systems in the future.

Mohsin Rasheed

Co-Founder & Chief Editor of Everyman Science. I view science not just as a collection of facts, but as the ultimate guide for human survival. From medical breakthroughs to the logistics of space exploration, I am dedicated to documenting how scientific reasoning uplifts the human spirit and provides the blueprints to save our planet. I believe that by unleashing the power of nature through disciplined inquiry, we can secure a sustainable future for humanity.

The post ILLUMA-T: NASA’s Laser Communication System Ready for Space Trials appeared first on Everyman Science.

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The Nature of Dark Matter

Scientists are divided on the nature of dark matter. Some believe it to be an undiscovered particle that follows traditional laws of gravity, while others suggest that the issue lies in our understanding of gravity itself. The latter view proposes the idea of Modified Newtonian Dynamics (MOND), where gravity acts differently on the largest and smallest scales compared to Newton and Einstein’s theories.

Modified Newtonian Dynamics (MOND)

While MOND has faced skepticism due to the success of Newton and Einstein’s gravity theories, recent observations published in The Astrophysical Journal provide evidence in support of modified gravity. Researchers, led by Kyu-Hyun Chae from Sejong University, analyzed the movements of binary stars gravity using data from the European Gaia satellite. They focused on binary stars with wide, distant orbits to measure their accelerations, which MOND and traditional theories predict differently.

The study found that these widely spaced stars exhibit slower motion, allowing for tests of gravity at low accelerations. It was observed that modified gravity predicts a 30 to 40 percent faster motion of stars compared to “normal” gravity, aligning with the data collected. At such small scales, Chae argues that dark matter cannot account for the differences from traditional gravity predictions.

Xavier Hernandez, an astronomer at the National Autonomous University of Mexico, who proposed the idea of testing gravity with wide binary systems, has confidence in these findings. Hernandez believes that the convergence of these results with his previous work strengthens their validity and highlights the scientific process.

The most plausible explanation for Chae’s observations is a specific type of modified gravity theory called AQUAL MOND. This theory offers the best understanding of the data collected, further supporting the notion that traditional gravity theories break down at certain scales.

Extending Einstein’s General Relativity

The potential deviation of gravity from Einstein’s theoretical framework does not necessitate the dismissal of our existing knowledge. Physicist Sergei Ketov of the University of Tokyo Kavli Institute asserts that various versions of modified gravity extend beyond Einstein’s general relativity, but they do not invalidate it; rather, they establish its limitations.

However, skepticism persists among scientists regarding the conclusive support for Modified Newtonian Dynamics (MOND). Science communicator Ethan Siegel, in his column “Starts with a Bang,” suggests that recent findings are a blend of sound and flawed scientific practices, exacerbated by the uncertainty prevalent in science reporting. The crux of the matter lies in concerns about the reliability of observations used in Chae’s study, and disparities among research papers’ outcomes due to the inclusion or exclusion of specific stars, leading to a schism among scientists about accurate assumptions.

To Doubters and Unresolved Concerns

Chae, the researcher, invites doubters to challenge his findings while acknowledging the foundation of their skepticism. He also points out a crucial omission in contradictory research—an essential self-calibration step. Presently, modified gravity theories resemble the Bohr model of atoms before the advent of quantum physics. Chae underscores that these theories, like quantum physics, will evolve progressively. Over time and with rigorous testing, the prevailing theory between modifications to gravity and the existence of dark matter as a particle will emerge. Hernandez further emphasizes that disregarding modified gravity is untenable, given its contradiction of Newton’s predictions as evidenced by the behavior of binary stars.

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