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Albedo and atmospheric constraints of dwarf planet Makemake from a stellar occultation.

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Title: Albedo and atmospheric constraints of dwarf planet Makemake from a stellar occultation.
Authors: Ortiz, J. L., Sicardy, B., Braga-Ribas, F., Alvarez-Candal, A., Lellouch, E., Duffard, R., Pinilla-Alonso, N., Ivanov, V. D., Littlefair, S. P., Camargo, J. I. B., Assafin, M., Unda-Sanzana, E., Jehin, E., Morales, N., Tancredi, G., Gil-Hutton, R., de la Cueva, I., Colque, J. P., Da Silva Neto, D. N., Manfroid, J.
Source: Nature. 11/22/2012, Vol. 491 Issue 7425, p566-569. 4p. 2 Diagrams, 1 Chart, 1 Graph.
Subjects: Pluto (Dwarf planet), Eris (Dwarf planet), Makemake (Dwarf planet), Occultations (Astronomy), Albedo, Spectrum analysis
Abstract: Pluto and Eris are icy dwarf planets with nearly identical sizes, comparable densities and similar surface compositions as revealed by spectroscopic studies. Pluto possesses an atmosphere whereas Eris does not; the difference probably arises from their differing distances from the Sun, and explains their different albedos. Makemake is another icy dwarf planet with a spectrum similar to Eris and Pluto, 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 known, there has been no constraint on its density and there were expectations that it could have a Pluto-like atmosphere. 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 (1?) 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 (1?) 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. [ABSTRACT FROM AUTHOR]
Copyright of Nature is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Psychology and Behavioral Sciences Collection
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  Data: Albedo and atmospheric constraints of dwarf planet Makemake from a stellar occultation.
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  Data: <searchLink fieldCode="AR" term="%22Ortiz%2C+J%2E+L%2E%22">Ortiz, J. L.</searchLink><br /><searchLink fieldCode="AR" term="%22Sicardy%2C+B%2E%22">Sicardy, B.</searchLink><br /><searchLink fieldCode="AR" term="%22Braga-Ribas%2C+F%2E%22">Braga-Ribas, F.</searchLink><br /><searchLink fieldCode="AR" term="%22Alvarez-Candal%2C+A%2E%22">Alvarez-Candal, A.</searchLink><br /><searchLink fieldCode="AR" term="%22Lellouch%2C+E%2E%22">Lellouch, E.</searchLink><br /><searchLink fieldCode="AR" term="%22Duffard%2C+R%2E%22">Duffard, R.</searchLink><br /><searchLink fieldCode="AR" term="%22Pinilla-Alonso%2C+N%2E%22">Pinilla-Alonso, N.</searchLink><br /><searchLink fieldCode="AR" term="%22Ivanov%2C+V%2E+D%2E%22">Ivanov, V. D.</searchLink><br /><searchLink fieldCode="AR" term="%22Littlefair%2C+S%2E+P%2E%22">Littlefair, S. P.</searchLink><br /><searchLink fieldCode="AR" term="%22Camargo%2C+J%2E+I%2E+B%2E%22">Camargo, J. I. B.</searchLink><br /><searchLink fieldCode="AR" term="%22Assafin%2C+M%2E%22">Assafin, M.</searchLink><br /><searchLink fieldCode="AR" term="%22Unda-Sanzana%2C+E%2E%22">Unda-Sanzana, E.</searchLink><br /><searchLink fieldCode="AR" term="%22Jehin%2C+E%2E%22">Jehin, E.</searchLink><br /><searchLink fieldCode="AR" term="%22Morales%2C+N%2E%22">Morales, N.</searchLink><br /><searchLink fieldCode="AR" term="%22Tancredi%2C+G%2E%22">Tancredi, G.</searchLink><br /><searchLink fieldCode="AR" term="%22Gil-Hutton%2C+R%2E%22">Gil-Hutton, R.</searchLink><br /><searchLink fieldCode="AR" term="%22de+la+Cueva%2C+I%2E%22">de la Cueva, I.</searchLink><br /><searchLink fieldCode="AR" term="%22Colque%2C+J%2E+P%2E%22">Colque, J. P.</searchLink><br /><searchLink fieldCode="AR" term="%22Da+Silva+Neto%2C+D%2E+N%2E%22">Da Silva Neto, D. N.</searchLink><br /><searchLink fieldCode="AR" term="%22Manfroid%2C+J%2E%22">Manfroid, J.</searchLink>
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  Data: <searchLink fieldCode="JN" term="%22Nature%22">Nature</searchLink>. 11/22/2012, Vol. 491 Issue 7425, p566-569. 4p. 2 Diagrams, 1 Chart, 1 Graph.
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  Data: Pluto and Eris are icy dwarf planets with nearly identical sizes, comparable densities and similar surface compositions as revealed by spectroscopic studies. Pluto possesses an atmosphere whereas Eris does not; the difference probably arises from their differing distances from the Sun, and explains their different albedos. Makemake is another icy dwarf planet with a spectrum similar to Eris and Pluto, 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 known, there has been no constraint on its density and there were expectations that it could have a Pluto-like atmosphere. 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 (1?) 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 (1?) 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. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Nature is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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