Write a comment
An international team of astronomers has not only detected clouds on the distant exoplanet WASP-127b, but also measured their altitude with unprecedented precision. A presentation by Dr Romain Allart at the Europlanet Science Congress (EPSC) 2021 shows how, by combining data from a space- and a ground-based telescope, the team has been able to reveal the upper structure of the planet's atmospher An international team of astronomers has not only detected clouds on the distant exoplanet WASP-127b, but also measured their altitude with unprecedented precision. A presentation by Dr Romain Allart at the Europlanet Science Congress (EPSC) 2021 shows how, by combining data from a space- and a ground-based telescope, the team has been able to reveal the upper structure of the planet's atmosphere. This paves the way for similar studies of many other faraway worlds.
WASP-127b, located more than 525 light-years away, is a "hot Saturn" - a giant planet similar in mass to Saturn that orbits very close to its sun. The team observed the planet passing in front of its host star to detect patterns that become embedded in the starlight as it is filtered through the planet's atmosphere and altered by the chemical constituents. By combining infrared observations from the ESA/NASA Hubble Space Telescope (HST) and visible light measurements from the ESPRESSO spectrograph at the European Southern Observatory's Very Large Telescope in Chile, the researchers were able to probe different regions of the atmosphere. The results brought a few surprises.
'First, as found before in this type of planet, we detected the presence of sodium, but at a much lower altitude than we were expecting. Second, there were strong water vapour signals in the infrared but none at all at visible wavelengths. This implies that water-vapour at lower levels is being screened by clouds that are opaque at visible wavelengths but transparent in the infrared,' said Allart, of the iREx/Universite de Montreal and Universite de Geneve, who led the study.
The combined data from the two instruments enabled the researchers to narrow down the altitude of the clouds to an atmospheric layer with a pressure ranging between 0.3 and 0.5 millibars.
'We don't yet know the composition of the clouds, except that they are not composed of water droplets like on Earth,' said Allart. 'We are also puzzled about why the sodium is found in an unexpected place on this planet. Future studies will help us understand not only more about the atmospheric structure, but about WASP-127b, which is proving to be a fascinating place.'
With a full orbit around its star occurring in about four days, WASP-127b receives 600 times more irradiation than the Earth and experiences temperatures up to 1100 degrees Celsius. This puffs the planet up to a radius 1.3 times larger than Jupiter, with just a fifth of the mass, making it one of the least dense or "fluffiest" exoplanets ever discovered.
The extended nature of fluffy exoplanets makes them easier to observe, and thus WASP-127b is an ideal candidate for researchers working on atmospheric characterisation.
The team's observations with the ESPRESSO instrument also suggests that, unlike planets in our Solar System, WASP-127b orbits not only in the opposite direction than its star but also in a different plane than the equatorial one.
'Such alignment is unexpected for a hot Saturn in an old stellar system and might be caused by an unknown companion,' said Allart. 'All these unique characteristics make WASP-127b a planet that will be very intensely studied in the future'
The Echelle SPectrograph for Rocky Exoplanets and Stable Spectroscopic Observations (ESPRESSO) is the world's most precise spectrograph for radial velocity measurements, a method enabling to detect exoplanets.
The authors would like to acknowledge Dr Jessica Spake and her team for releasing the refined HST data used in this work.
Research Report: "WASP-127b: a misaligned planet with a partly cloudy atmosphere and tenuous sodium signature seen by ESPRESSO"
Related Links
Europlanet
Lands Beyond Beyond - extra solar planets - news and science
Life Beyond Earth
|
| Tweet |
| Thanks for being there;
We need your help. The SpaceDaily news network continues to grow but revenues have never been harder to maintain. With the rise of Ad Blockers, and Facebook - our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don't have a paywall - with those annoying usernames and passwords. Our news coverage takes time and effort to publish 365 days a year. If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution. | ||
| SpaceDaily Monthly Supporter
$5+ Billed Monthly |  | SpaceDaily Contributor
$5 Billed Once credit card or paypal |
Planets form in organic soups with different ingredients
Boston MA (SPX) Sep 17, 2021
Astronomers have mapped out the chemicals inside of planetary nurseries in extraordinary detail. The newly unveiled maps reveal the locations of dozens of molecules within five protoplanetary disks - regions of dust and gas where planets form around young stars. "These planet-forming disks are teeming with organic molecules, some which are implicated in the origins of life here on Earth," explains Karin Oberg, an astronomer at the Center for Astrophysics | Harvard and Smithsonian (CfA) who led the ... read more