Edasich dK star
Number of posts : 2285 Location : Tau Ceti g - Mid Latitudes Registration date : 2008-06-02
| Subject: JWST Results 8th January 2024, 6:50 am | |
| Let’s start with an imaged a planet candidate JWST/NIRCam Imaging of Young Stellar Objects. II. Deep Constraints on Giant Planets and a Planet Candidate Outside of the Spiral Disk Around SAO 206462https://arxiv.org/abs/2401.02834 | |
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Edasich dK star
Number of posts : 2285 Location : Tau Ceti g - Mid Latitudes Registration date : 2008-06-02
| Subject: Re: JWST Results 11th January 2024, 4:35 am | |
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Edasich dK star
Number of posts : 2285 Location : Tau Ceti g - Mid Latitudes Registration date : 2008-06-02
| Subject: Re: JWST Results 12th January 2024, 5:41 am | |
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Edasich dK star
Number of posts : 2285 Location : Tau Ceti g - Mid Latitudes Registration date : 2008-06-02
| Subject: Re: JWST Results 25th January 2024, 4:29 am | |
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Edasich dK star
Number of posts : 2285 Location : Tau Ceti g - Mid Latitudes Registration date : 2008-06-02
| Subject: Re: JWST Results 2nd April 2024, 3:29 am | |
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Edasich dK star
Number of posts : 2285 Location : Tau Ceti g - Mid Latitudes Registration date : 2008-06-02
| Subject: Re: JWST Results 18th April 2024, 2:46 am | |
| Methane Emission From a Cool Brown Dwarf - Quote :
- Beyond our solar system, aurorae have been inferred from radio observations of isolated brown dwarfs (e.g. Hallinan et al. 2006; Kao et al. 2023). Within our solar system, giant planets have auroral emission with signatures across the electromagnetic spectrum including infrared emission of H3+ and methane. Isolated brown dwarfs with auroral signatures in the radio have been searched for corresponding infrared features but have only had null detections (e.g. Gibbs et al. 2022). CWISEP J193518.59-154620.3. (W1935 for short) is an isolated brown dwarf with a temperature of ~482 K. Here we report JWST observations of strong methane emission from W1935 at 3.326 microns. Atmospheric modeling leads us to conclude that a temperature inversion of ~300 K centered at 1-10 millibar replicates the feature. This represents an atmospheric temperature inversion for a Jupiter-like atmosphere without irradiation from a host star. A plausible explanation for the strong inversion is heating by auroral processes, although other internal and/or external dynamical processes cannot be ruled out. The best fit model rules out the contribution of H3+ emission which is prominent in solar system gas giants however this is consistent with rapid destruction of H3+ at the higher pressure where the W1935 emission originates (e.g. Helling et al. 2019).
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Edasich dK star
Number of posts : 2285 Location : Tau Ceti g - Mid Latitudes Registration date : 2008-06-02
| Subject: Re: JWST Results 22nd April 2024, 4:11 am | |
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| Subject: Re: JWST Results | |
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