UNIVERSE PRESENTATION
yedamlee51
Created on March 17, 2023
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presented by Sofian boughebri and yé-jin lee
NAsa's webb detects carbon dioxide in exoplanet atmosphere
https://www.midilibre.fr/2022/08/26/espace-le-telescope-james-webb-detecte-pour-la-premiere-fois-du-co2-dans-latmosphere-dune-exoplanete-10506743.php
- Is an infrared observatory orbiting the sun.
- Has the ability to detect atmospheres of exoplanets.
The largest optical telescope in space :
James webb spatial telescope
https://exoplanets.nasa.gov/exoplanet-catalog/5673/wasp-39-b/
- Exoplanet : a planet that orbits a star outside our solar system.
- WASP-39b is a hot gas giant orbiting a sun-like, about 700 light-years away from us.
- Clear detection of carbon dioxide in its atmosphere on July 2022.
the exoplanet WASP-39b
The exoplanet WASP-39b:
How do we know that wasp-39B atmosphere has carbon dioxide ?
https://www.esa.int/ESA_Multimedia/Videos/2021/09/Webb_NIRSpec_integral_field_units_principle_animation
The nirspec
The NIRSpec
is the acronym for : Near InfraRed Spectograph. It is a special observation mode in the JWST.
https://svs.gsfc.nasa.gov/11428
- A transit is a phenomenon when a celestial body passes directly between a larger star and the telescope.
- 2.5% of the star's light blocked by WASP-39b during the transit.
How transmission spectroscopy works?
https://webbtelescope.org/contents/media/images/2022/032/01G72W1XZK6A79RJK2Z93D58CD
https://webbtelescope.org/contents/media/images/01FEE26XVSM851DHPVCE1KB4S2?Tag=Spectroscopy
wavelengths blocked
Gases in the exoplanet's atmosphere filter out some colors/wavelengths, depending on that, we know the composition of its atmosphere.
The differences between those spectra we can observe : different wavelengths.
https://astrobiology.com/2022/08/webb-space-telescope-identification-of-carbon-dioxide-in-an-exoplanet-atmosphere.html
Curves of changes of the colors of the star's light over time.
https://www.esa.int/ESA_Multimedia/Images/2022/08/Exoplanet_WASP-39_b_NIRSpec_transit_light_curves
https://www.planetary.org/space-images/wasp-39bs-atmospheric-composition
https://www.planetary.org/space-images/wasp-39bs-atmospheric-composition
https://astronomy.com/magazine/2018/07/exoplanets-burst-onto-the-scene
the importance of this discovery ?
to conclude
THANK you for your attention