Study Findings: A Second Visit to Eps Ind Ab with JWST: New Photometry Confirms Ammonia and Suggests Thick Clouds in the Exoplanet Atmosphere of the Closest Super-Jupiter

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Image (Credit): Juno mission image of Jupiter taken on Juno’s 22nd close pass by Jupiter on Sept. 12, 2019. (NASA/JPL-Caltech/SwRI/MSSS / Image processing by Prateek Sarpal, © CC NC SA)

The Astrophysical Journal Letters abstract of study findings:

With JWST, we are directly imaging cold (∼200–300 K) solar-age giant exoplanets for the first time. At these temperatures, many molecular features appear, and water-ice clouds may condense and affect the emission spectrum; early photometric measurements of cold giant planets are already showing some tension with the predictions of cloud-free solar-metallicity atmosphere models. Here, we present new JWST/MIRI coronagraphic observations of the cold giant exoplanet Eps Ind Ab at 11.3 μm. Together with archival data, we use these new observations to study the atmosphere of this cold exoplanet, and we also refit its orbit, finding an updated mass of 7.6  ±  0.7MJup and an eccentricity of 0.24 +0.11/-0.08. The planet is significantly brighter (by 0.88  ±  0.08 mag) at 11.3 μm than at 10.6 μm, indicating the presence of ammonia. However, this ammonia feature is shallower than expected. This could indicate a low-metallicity or nitrogen-depleted atmosphere, but our preferred explanation is the presence of thick water-ice clouds that suppress the ammonia feature and the near-IR emission of Eps Ind Ab. Photometry of the small but growing sample of cold giant exoplanets demonstrates that they are consistently fainter than expected between 3 and 5 μm, consistent with the water-ice cloud hypothesis. 10.6 μm and 11.3 μm photometry of this cold exoplanet sample would be valuable to determine whether the suppressed ammonia feature is universal, and to frame a new open question about the underlying physical cause.

Citation: Elisabeth C. Matthews et al. a second visit to eps ind ab with JWST: new photometry confirms ammonia and suggests thick clouds in the exoplanet atmosphere of the closest super-Jupiter, ApJL 1002 L5 (2026).

DOI: 10.3847/2041-8213/ae5823

Study-related stories:

Max Planck Institute for Astronomy – “Cirrus Clouds Made of Water Ice May Surround a Jupiter-like Exoplanet”

Universe Today – “Webb Finds Water-Ice Clouds on Nearby Super-Jupiter”

Sci.News – “Webb Spots Icy Clouds on Distant Jupiter-Like Exoplane”

Audit Report: Will the Artemis Astronauts Have Spacesuits?

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Credit: NASA OIG

A new audit report from NASA’s Office of Inspector General (OIG) expressed some concerns about whether the contractor, Axiom Space, will have spacesuits ready in time for the planned lunar landing.

The audit report, NASA’s Acquisition of Next-Generation Spacesuit Services, states:

NASA faces challenges in ensuring next-generation spacesuits are available to meet the Agency’s current schedules for the Artemis lunar landing mission in 2028 and prior to the ISS’s decommissioning in 2030. NASA’s original schedules to demonstrate the lunar and microgravity spacesuits in 2025 and 2026, respectively, were overly optimistic and ultimately proved unachievable, as evidenced by delays of at least a year and a half for both spacesuits. Based on our analysis, if Axiom experiences design and testing delays in line with the historical average for recent space programs, the Artemis and ISS demonstrations may not occur until 2031.

That is a damning conclusion at a time NASA is struggling with other Artemis timetables. All of the pieces need to come together soon, including the necessary equipment for the lunar surface. It also does not help that NASA is completely reliant on one contractor for these spacesuits. Even the lunar lander has two competing contractors.

NASA Administrator Isaacman has one more item now keeping him awake at night.

Sci-Fi Quote: To Titan and Beyond

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Credit: Apple TV

“I think the promise of the show was always that we were going to go beyond just the moon and Mars. I think that’s kind of what I think Titan represents. It’s one of those steps we’ve been looking to make from the very beginning. I will say you’ll see more of it. I don’t want to get into details of what exactly is going to happen, but yes, Titan is very much a plan for this season in particular. So anyone who’s been following so far will see the next steps in the next few episodes.“

-Statement by For All Mankind’s executive producer Ben Nedivi in an interview with ScreenRant regarding the latest season of the television series. The alternative history series started the fifth season with a growing Happy Valley Martian colony. The new space race is aiming for Saturn’s moon. Whether this is the last stop before the series ends with season six is anybody’s guess.

Pic of the Week: Hubble and the Crab Nebula

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Image (Credit): A 2024 image of the Crab Nebula captured by NASA’s Hubble Space Telescope. (NASA, ESA, STScI, William Blair (JHU); Image Processing: Joseph DePasquale (STScI))

This week’s image is from the Hubble Space Telescope. It is an image of the Crab Nebula taken 25 years after the Hubble’s first image of the nebula. If you want to learn more about this history, a paper titled The Crab Nebula Revisited Using HST/WFC3 can be found in The Astrophysical Journal.

Here is a little more from NASA on earlier sightings of the nebula:

This new Hubble observation continues a legacy that stretches back nearly 1,000 years, when astronomers in 1054 recorded the supernova as an impressively bright new star that, for weeks, was visible even during the day. The Crab Nebula is the aftermath of SN 1054, located 6,500 light-years from Earth in the constellation Taurus…

The supernova remnant was discovered in the mid-18th century, and in the 1950s Edwin Hubble was among several astronomers who noted the close correlation between Chinese astronomical records of a supernova and the position of the Crab Nebula. The discovery that the heart of the Crab contained a pulsar — a rapidly rotating neutron star — that was powering the nebula’s expansion finally aligned modern observations and ancient records.