How in the world would we detect an exoplanet with a million year orbit? Just about every detection technique is based on observing something periodic about the system. And if you did manage to directly image an exoplanet you have no proof it is really is one and not something that simply lined up.
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Shadowy Man
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I doubt lpetrich would have made that statement without evidence so I’m sure he’ll be around soon to provide a link to a description of an exoplanet with a million year orbital period.
bilby
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By definition, we cannot detect any exoplanets "in the world"
lpetrich
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Cool Companions on Ultrawide Orbits - COCONUTS - "is a large-scale survey for wide-orbit planetary and substellar companions considered the first survey of this type of celestial bodies." COCONUTS-2b and Massive COCONUTS exoplanet discovery led by UH grad student | University of Hawaiʻi System News and The Second Discovery from the COCONUTS Program: A Cold Wide-orbit Exoplanet around a Young Field M Dwarf at 10.9 pc - NASA/ADSFrom the abstract,
The star is the M3 dwarf L 34-26
The planet is the T9 dwarf WISEPA J075108.79-763449.6
"Given their common proper motions and parallaxes, these two field objects constitute a physically bound pair with a projected separation of 594″ (6471au)."
No mention of radial velocity, however. Parallax: distance, proper motion: transverse angular velocity.
"The primary star COCONUTS-2A has strong stellar activity (Hα, X-ray, and ultraviolet emission) and is rapidly rotating (Prot = 2.83 days), from which we estimate an age of 150-800 Myr."
Then speculating on how the planet was formed, and ending with "Finally, at a distance of 10.9 pc, COCONUTS-2b is the nearest imaged exoplanet to Earth known to date."
bilby
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The astronomical and space exploration communities sometimes seem to spend more time coming up with "cool" acronyms and initialisms than they do on their real jobs.
Feels like a lot more precision than the observations support. I see no uncertainties given for it's motion numbers and if I didn't mess the envelope up I'm getting an escape velocity from it's host around 300 m/s. I get very suspicious about numbers with no uncertainty and far more precision than could possibly be measured.
From the abstract,
The star is the M3 dwarf L 34-26
The planet is the T9 dwarf WISEPA J075108.79-763449.6
"Given their common proper motions and parallaxes, these two field objects constitute a physically bound pair with a projected separation of 594″ (6471au)."
No mention of radial velocity, however. Parallax: distance, proper motion: transverse angular velocity.
"The primary star COCONUTS-2A has strong stellar activity (Hα, X-ray, and ultraviolet emission) and is rapidly rotating (Prot = 2.83 days), from which we estimate an age of 150-800 Myr."
Then speculating on how the planet was formed, and ending with "Finally, at a distance of 10.9 pc, COCONUTS-2b is the nearest imaged exoplanet to Earth known to date."
Wikipedia gives a radial velocity.
Shadowy Man
Contributor
Hehe... I've sat around some acronym brainstorming sessions, indeed. However, I have always felt it was poor form to use letters from the middle or ends of words.