Edasich dG star
Number of posts : 2310 Location : Tau Ceti g - Mid Latitudes Registration date : 2008-06-02
| Subject: CFHTWIR-Oph 98 b 21st May 2021, 6:22 am | |
| Had we reported this imaged planet before? Today I've stumbled upon this checking latest NASA ExoplanetArchive page. A wide planetary-mass companion to a young low-mass brown dwarf in Ophiuchus - Quote :
- We present the discovery of a planetary-mass companion to CFHTWIR-Oph 98, a low-mass brown dwarf member of the young Ophiuchus star-forming region, with a wide 200-AU separation (1.46 arcsec). The companion was identified using Hubble Space Telescope images, and confirmed to share common proper motion with the primary using archival and new ground-based observations. Based on the very low probability of the components being unrelated Ophiuchus members, we conclude that Oph 98 AB forms a binary system. From our multi-band photometry, we constrain the primary to be an M9-L1 dwarf, and the faint companion to have an L2-L6 spectral type. For a median age of 3 Myr for Ophiuchus, fits of evolutionary models to measured luminosities yield masses of 15.4±0.8 MJup for Oph 98 A and 7.8±0.8 MJup for Oph 98 B, with respective effective temperatures of 2320±40 K and 1800±40 K. For possible system ages of 1-7 Myr, masses could range from 9.6-18.4 MJup for the primary, and from 4.1-11.6 MJup for the secondary. The low component masses and very large separation make this binary the lowest binding energy system imaged to date, indicating that the outcome of low-mass star formation can result in such extreme, weakly-bound systems. With such a young age, Oph 98 AB extends the growing population of young free-floating planetary-mass objects, offering a new benchmark to refine formation theories at the lowest masses.
If we had, please merge the topic wherever the original one is. | |
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Edasich dG star
Number of posts : 2310 Location : Tau Ceti g - Mid Latitudes Registration date : 2008-06-02
| Subject: Re: CFHTWIR-Oph 98 b 22nd May 2021, 6:47 am | |
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