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Albedo and atmospheric constraints of dwarf planet Makemake from a stellar occultation
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(2012) Albedo and atmospheric constraints of dwarf planet Makemake from a stellar occultation. Nature, Vol. 491 (No. 7425). pp. 566-569. doi:10.1038/nature11597 ISSN 0028-0836.
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Official URL: http://dx.doi.org/10.1038/nature11597
Abstract
Pluto and Eris are icy dwarf planets with nearly identical sizes, comparable densities and similar surface compositions as revealed by spectroscopic studies1, 2. Pluto possesses an atmosphere whereas Eris does not; the difference probably arises from their differing distances from the Sun, and explains their different albedos3. Makemake is another icy dwarf planet with a spectrum similar to Eris and Pluto4, and is currently at a distance to the Sun intermediate between the two. Although Makemake’s size (1,420 ± 60 km) and albedo are roughly known5, 6, there has been no constraint on its density and there were expectations that it could have a Pluto-like atmosphere4, 7, 8. Here we report the results from a stellar occultation by Makemake on 2011 April 23. Our preferred solution that fits the occultation chords corresponds to a body with projected axes of 1,430 ± 9 km (1σ) and 1,502 ± 45 km, implying a V-band geometric albedo pV = 0.77 ± 0.03. This albedo is larger than that of Pluto, but smaller than that of Eris. The disappearances and reappearances of the star were abrupt, showing that Makemake has no global Pluto-like atmosphere at an upper limit of 4–12 nanobar (1σ) for the surface pressure, although a localized atmosphere is possible. A density of 1.7 ± 0.3 g cm−3 is inferred from the data.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
| Journal or Publication Title: | Nature | ||||
| Publisher: | Nature Publishing Group | ||||
| ISSN: | 0028-0836 | ||||
| Official Date: | 2012 | ||||
| Dates: |
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| Volume: | Vol. 491 | ||||
| Number: | No. 7425 | ||||
| Page Range: | pp. 566-569 | ||||
| DOI: | 10.1038/nature11597 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access |
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