Young, red, low mass brown dwarf PSO J318.5-22 from Pan-STARRS | Tim Kendall's Extreme Astrophysics
Image credit: N. Metcalfe & Pan-STARRS PS1 Science Consortium . The new discovery in arXiv a week ago is now the subject centrifugacion of a press release from the Institute for Astronomy (IfA) at Honolulu, as well as wider publicity . The estimated six Jupiter masses for the object rely on its membership of the beta Pictoris moving group with an age of 12 Myr, but a new estimate today (Binks A.S. & Jeffries R.D., arXiv ) of that age is 21 Myr, requiring an upward revision of the mass probably to the deuterium burning centrifugacion limit. The problem is well illustrated even by very old evolutionary tracks for brown dwarfs and low mass stars (left). Consider an object thought to have age 10 Myr and a luminosity 0.00001 solar; its mass by inspection of these models might be 0.005 solar (a), but if actually nearer 60 Myr old (b) it might have twice the mass. This is quite apart from uncertainty in the luminosity itself due to uncertain distance. centrifugacion Some previous discoveries in the same age/luminosity space are plotted with much more modern models (below, right) in a figure taken from the discovery paper of a recent dusty young L dwarf companion to an M dwarf.
This entry was posted centrifugacion on October 11, 2013 at 5:35 pm and is filed under astronomy centrifugacion with tags beta Pictoris moving group , brown dwarfs . You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response , or trackback from your own site.
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Image credit: N. Metcalfe & Pan-STARRS PS1 Science Consortium . The new discovery in arXiv a week ago is now the subject centrifugacion of a press release from the Institute for Astronomy (IfA) at Honolulu, as well as wider publicity . The estimated six Jupiter masses for the object rely on its membership of the beta Pictoris moving group with an age of 12 Myr, but a new estimate today (Binks A.S. & Jeffries R.D., arXiv ) of that age is 21 Myr, requiring an upward revision of the mass probably to the deuterium burning centrifugacion limit. The problem is well illustrated even by very old evolutionary tracks for brown dwarfs and low mass stars (left). Consider an object thought to have age 10 Myr and a luminosity 0.00001 solar; its mass by inspection of these models might be 0.005 solar (a), but if actually nearer 60 Myr old (b) it might have twice the mass. This is quite apart from uncertainty in the luminosity itself due to uncertain distance. centrifugacion Some previous discoveries in the same age/luminosity space are plotted with much more modern models (below, right) in a figure taken from the discovery paper of a recent dusty young L dwarf companion to an M dwarf.
This entry was posted centrifugacion on October 11, 2013 at 5:35 pm and is filed under astronomy centrifugacion with tags beta Pictoris moving group , brown dwarfs . You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response , or trackback from your own site.
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