# Snellen 2020: Re-analysis of the 267 GHz ALMA observations of Venus

> I. A. G. Snellen, L. Guzman-Ramirez, M. R. Hogerheijde et al., 2020. 7 records on Mysteries Department cite it. The central methodological critique of…

Source: https://mysteriesdept.com/sources/SRC0CQY1HEP0S8P/re-analysis-of-the-267-ghz-alma-observations-of-venus  
Publisher: Mysteries Department  
Licence: CC BY 4.0 (credit Mysteries Department and link the page)  

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[Sources](https://mysteriesdept.com/sources)[Phosphine in the clouds of Venus](https://mysteriesdept.com/mysteries/venus-phosphine)Snellen 2020

**0**

# Re-analysis of the 267 GHz ALMA observations of Venus

I. A. G. Snellen, L. Guzman-Ramirez, M. R. Hogerheijde et al., 2020. _Astronomy & Astrophysics 644, L2_.

Reduces the ALMA data with the published scripts and shows that the 12th-order polynomial used to flatten the passband creates spurious lines: following the recipe, five other features above 10 sigma appear within 60 km/s of the phosphine frequency. Independent analysis finds a feature at about 2 sigma.

**Phosphine in the clouds of Venus** Articledoi: **[10.1051/0004-6361/202039717](https://doi.org/10.1051/0004-6361/202039717)** Checked against the original0

## What it's used for here

The central methodological critique of the ALMA detection.

## Cited by on this site 7 records

[The feature is an artefact of baseline fitting and calibration, not a property of Venus.](https://mysteriesdept.com/mysteries/venus-phosphine/answers/ANS0CQY1XNA2472/the-feature-is-an-artefact-of-baseline-fitting-and)

Answer

ANS

[Following the published recipe produces other strong spurious lines within 60 km/s.](https://mysteriesdept.com/mysteries/venus-phosphine/evidence/EVD0CQY1XX46N2W/following-the-published-recipe-produces-other-strong)

Evidence

EVD

[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)

Evidence

EVD

[Independent re-analyses find no significant line or attribute it to sulphur dioxide](https://mysteriesdept.com/mysteries/venus-phosphine/events/EVT0CQY1S0W6PFN/independent-re-analyses-find-no-significant-line-or)

EVT

[Ignas A. G. Snellen](https://mysteriesdept.com/mysteries/venus-phosphine/people/FIG0CQY1R1M4FBA/ignas-a-g-snellen)

FIG

[Phosphine in the clouds of Venus](https://mysteriesdept.com/mysteries/venus-phosphine)

The mystery article

MYS

[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)

Question

QST

## Cite it

```
Snellen, I. A. G., Guzman-Ramirez, L., Hogerheijde, M. R., Hygate, A. P. S., & van der Tak, F. F. S. (2020). Re-analysis of the 267 GHz ALMA observations of Venus. Astronomy & Astrophysics 644, L2. https://doi.org/10.1051/0004-6361/202039717
```

[Read it free at doi.org](https://doi.org/10.1051/0004-6361/202039717)

Key

**SRC** 0CQY1HEP0S8P

Kind

Journal article

Rights

The publisher's

Checked

Against the published article

Added by

[apollo](https://mysteriesdept.com/u/apollo)

The record

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