Strong CO+ and N2+ Emission in Comet C/2016 R2 (Pan-STARRS)

被引：42

作者：

Cochran, Anita L. ^{[1
]}

McKay, Adam J. ^{[2
]}

机构：

[1] Univ Texas Austin, McDonald Observ, Austin, TX 78712 USA

[2] Univ Space Res Assoc, NASA, Goddard Space Flight Ctr, Greenbelt, MD USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2018年 / 854卷 / 01期

关键词：

comets: individual (2016 R2); molecular processes; protoplanetary disks;

D O I：

10.3847/2041-8213/aaab57

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report on imaging and spectroscopic observations of comet C/2016 R2 (Pan-STARRS) obtained with the 0.8 m and 2.7 m telescopes of McDonald Observatory in 2017 November and December, respectively. The comet was at a heliocentric distance greater than 3 au during both sets of observations. The images showed a well-developed tail with properties that suggested it was an ion tail. The spectra confirmed that we were observing welldeveloped bands of CO+ and N-2(+). The N-2(+) detection was unequivocally cometary and was one of the strongest bands of N-2(+) detected in a comet spectrum. We derived the ratio of these two ions and from that we were able to derive that N-2/CO = 0.15. This is the highest such ratio reported for a comet.

引用

页数：4

共 15 条

[1] TRAPPING OF GAS-MIXTURES BY AMORPHOUS WATER ICE [J].

BARNUN, A ;

KLEINFELD, I ;

KOCHAVI, E .

PHYSICAL REVIEW B, 1988, 38 (11) :7749-7754

[2] N2+ and CO+ in comets 122P/1995 S1 (deVico) and C/1995 O1 (Hale-Bopp) [J].

Cochran, AL ;

Cochran, WD ;

Barker, ES .

ICARUS, 2000, 146 (02) :583-593

[3] THE COMET-TAIL (A-X) SYSTEM OF CO+ - PRECISE MOLECULAR-CONSTANTS OF ITS X2-SIGMA+, A2-PI, AND B2-SIGMA+ STATES [J].

HARIDASS, C ;

PRASAD, CVV ;

REDDY, SP .

ASTROPHYSICAL JOURNAL, 1992, 388 (02) :669-&

[4] Photometric and spectroscopic analysis of Comet 29P/Schwassmann-Wachmann 1 activity [J].

Ivanova, Oleksandra V. ;

Luk'yanyk, Igor V. ;

Kiselev, Nikolay N. ;

Afanasiev, Viktor L. ;

Picazzio, Enos ;

Cavichia, Oscar ;

de Almeida, Amaury A. ;

Andrievsky, Sergei M. .

PLANETARY AND SPACE SCIENCE, 2016, 121 :10-17

[5] Distant activity of Comet C/2002 VQ94 (LINEAR): Optical spectrophotometric monitoring between 8.4 and 16.8 au from the Sun [J].

Korsun, Pavlo P. ;

Rousselot, Philippe ;

Kulyk, Irina V. ;

Afanasiev, Viktor L. ;

Ivanova, Oleksandra V. .

ICARUS, 2014, 232 :88-96

[6] SPECTROSCOPY OF N-2+ MEINEL BANDS AND CO+ COMET TAIL BANDS [J].

KUO, CH ;

MILKMAN, IW ;

STEIMLE, TC ;

MOSELEY, JT .

JOURNAL OF CHEMICAL PHYSICS, 1986, 85 (08) :4269-4275

[7]

Kurucz R. L., 1984, Solar flux atlas from 296 to 1300 nm

[8] KINETIC INHIBITION OF CO AND N-2 REDUCTION IN THE SOLAR NEBULA [J].

LEWIS, JS ;

PRINN, RG .

ASTROPHYSICAL JOURNAL, 1980, 238 (01) :357-364

[9] ION ABUNDANCES AND IMPLICATIONS FOR PHOTOCHEMISTRY IN COMETS HALLEY (1986 III) AND BRADFIELD (1987 XXIX) [J].

LUTZ, BL ;

WOMACK, M ;

WAGNER, RM .

ASTROPHYSICAL JOURNAL, 1993, 407 (01) :402-411

[10] CO+ FLUORESCENCE IN COMETS [J].

MAGNANI, L ;

AHEARN, MF .

ASTROPHYSICAL JOURNAL, 1986, 302 (01) :477-487

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