First observations of the Na exosphere of Mercury with the high-resolution spectrograph of the 3.5M Telescopio Nazionale Galileo

被引：12

作者：

Barbieri, C

Verani, S

Cremonese, G

Sprague, A

Mendillo, M

Cosentino, R

Hunten, D

机构：

[1] Univ Padua, Dept Astron, I-35122 Padua, Italy

[2] Astron Observ Padova, INAF, I-35122 Padua, Italy

[3] Univ Arizona, Lunar & Planetary Lab, Tucson, AZ 85721 USA

[4] Boston Univ, Ctr Space Phys, Boston, MA 02215 USA

来源：

PLANETARY AND SPACE SCIENCE | 2004年 / 52卷 / 13期

关键词：

Mercury; planetary exospheres; Na emission atmospheres; high-resolution planetary spectroscopy;

D O I：

10.1016/j.pss.2004.07.013

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Analysis of three spectra of the exosphere of Mercury in the Na-D lines are presented. Spectra were secured with the high-resolution spectrograph (SARG) of the 3.5 M Telescopio Nazionale Galileo (TNG, located on the Roque de los Muchachos, Canaries) on the evenings of August 23 and 24, 2002. Spectra have resolution R = 115 000; the slit length was 26.7". The Na column abundances range from 4.3 to 19.7 x 10(10) atoms/cm(2) with the highest abundances being close to the illuminated limb. Our observations at true anomaly angles (TAA) from 171 degrees to 174 degrees show the traces of the emission lines to be strongly peaked at the illuminated limb, supportive of recent modeling that shows thermal desorption to be a strong factor in determining the distribution of Na about the planet. (C) 2004 Elsevier Ltd. All rights reserved.

引用

页码：1169 / 1175

页数：7

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