# A real absorption feature from Venus's atmosphere is present in both the JCMT and ALMA data.

> Disputed: A real absorption feature from Venus's atmosphere is present in both the JCMT and ALMA data.

Source: https://mysteriesdept.com/mysteries/venus-phosphine/answers/ANS0CQY1VF01P0K/a-real-absorption-feature-from-venuss-atmosphere-is-present  
Publisher: Mysteries Department  
Licence: CC BY 4.0 (credit Mysteries Department and link the page)  

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[Questions](https://mysteriesdept.com/questions)[Phosphine in the clouds of Venus](https://mysteriesdept.com/mysteries/venus-phosphine)[Is there a real absorption line at 266.94 GHz in the Venus spectra?](https://mysteriesdept.com/mysteries/venus-phosphine/questions/QST0CQY1TFR14XV/is-there-a-real-absorption-line-at-266-94-ghz-in-the-venus)Answer

Answer · Phosphine in the clouds of Venus

# A real absorption feature from Venus's atmosphere is present in both the JCMT and ALMA data.

A real absorption feature from Venus's atmosphere is present in both the JCMT and ALMA data.

**Disputed** Answers **1** questionPublished0

## Where it stands

**Disputed** Four pieces of evidence for, four against. It needs two reviews to be accepted.

## What it predicts

- The feature survives any reasonable baseline treatment, including low-order fits and Fourier ripple removal.
- Injected fake lines of the same depth are recovered at the rate the claimed significance implies.
- The feature recurs in independent JCMT-Venus campaigns.

## What would rule it out

- A pre-registered reduction, validated on injected lines, that finds no feature at the frequency in the archival data and in the JCMT-Venus data.

## Evidence 4 for · 4 against

[After removing sulphur dioxide contamination, both spectra show 6–8 sigma absorption of similar depth.](https://mysteriesdept.com/mysteries/venus-phosphine/evidence/EVD0CQY1VYM7R3V/after-removing-sulphur-dioxide-contamination-both-spectra)

Suggestive

FOR

[JCMT-Venus announces a re-detection of phosphine.](https://mysteriesdept.com/mysteries/venus-phosphine/evidence/EVD0CQY1WE832YN/jcmt-venus-announces-a-re-detection-of-phosphine)

Speculative

FOR

[Phosphine and HDO lines are recovered in the first JCMT-Venus campaign with Fourier ripple removal.](https://mysteriesdept.com/mysteries/venus-phosphine/evidence/EVD0CQY1W6E2HYQ/phosphine-and-hdo-lines-are-recovered-in-the-first-jcmt)

Suggestive

FOR

[The team reports the line at about 5 sigma in ALMA data reprocessed with the revised calibration.](https://mysteriesdept.com/mysteries/venus-phosphine/evidence/EVD0CQY1VPT5C0Z/the-team-reports-the-line-at-about-5-sigma-in-alma-data)

Suggestive

FOR

[ALMA's standard calibration was unsuitable for so bright a target and had to be revised.](https://mysteriesdept.com/mysteries/venus-phosphine/evidence/EVD0CQY1X5P6K79/almas-standard-calibration-was-unsuitable-for-so-bright-a)

Established

AGAINST

[Bootstrap tests of the JCMT data with several baseline methods recover no significant line.](https://mysteriesdept.com/mysteries/venus-phosphine/evidence/EVD0CQY1WXW6228/bootstrap-tests-of-the-jcmt-data-with-several-baseline)

Supported

AGAINST

[Interferometric filtering of the bright disk complicates the detection of a broad, weak line.](https://mysteriesdept.com/mysteries/venus-phosphine/evidence/EVD0CQY1XDG1MMM/interferometric-filtering-of-the-bright-disk-complicates-the)

Suggestive

AGAINST

[The 12th-order polynomial used on the ALMA data creates five other features above 10 sigma nearby; an…](https://mysteriesdept.com/mysteries/venus-phosphine/evidence/EVD0CQY1WP2173J/the-12th-order-polynomial-used-on-the-alma-data-creates-five)

Supported

AGAINST

## The questions it answers

[Is there a real absorption line at 266.94 GHz in the Venus spectra?](https://mysteriesdept.com/mysteries/venus-phosphine/questions/QST0CQY1TFR14XV/is-there-a-real-absorption-line-at-266-94-ghz-in-the-venus)

Open3 answers, none ahead

## Cite it

```
Mysteries Department. (2026). A real absorption feature from Venus's atmosphere is present in both the JCMT and ALMA data. [Answer ANS0CQY1VF01P0K]. https://mysteriesdept.com/r/ANS0CQY1VF01P0K
```

Key

**ANS** 0CQY1VF01P0K

Kind

Answer · hypothesis

Origin

Published

Version

1

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