气候变化领域集成服务门户(CCPortal): Ammonium salts are a reservoir of nitrogen on a cometary nucleus and possibly on some asteroids

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DOI	10.1126/science.aax9554
	Ammonium salts are a reservoir of nitrogen on a cometary nucleus and possibly on some asteroids
	Poch O.; Istiqomah I.; Quirico E.; Beck P.; Schmitt B.; Theulé P.; Faure A.; Hily-Blant P.; Bonal L.; Raponi A.; Ciarniello M.; Rousseau B.; Potin S.; Brissaud O.; Flandinet L.; Filacchione G.; Pommerol A.; Thomas N.; Kappel D.; Mennella V.; Moroz L.; Vinogradoff V.; Arnold G.; Erard S.; Bockelée-Morvan D.; Leyrat C.; Capaccioni F.; Cristina De Sanctis M.; Longobardo A.; Mancarella F.; Palomba E.; Tosi F.
发表日期	2020
ISSN	0036-8075
卷号	367 期号:6483
英文摘要	The measured nitrogen-to-carbon ratio in comets is lower than for the Sun, a discrepancy which could be alleviated if there is an unknown reservoir of nitrogen in comets. The nucleus of comet 67P/Churyumov-Gerasimenko exhibits an unidentified broad spectral reflectance feature around 3.2 micrometers, which is ubiquitous across its surface. On the basis of laboratory experiments, we attribute this absorption band to ammonium salts mixed with dust on the surface. The depth of the band indicates that semivolatile ammonium salts are a substantial reservoir of nitrogen in the comet, potentially dominating over refractory organic matter and more volatile species. Similar absorption features appear in the spectra of some asteroids, implying a compositional link between asteroids, comets, and the parent interstellar cloud. © 2020 American Association for the Advancement of Science. All rights reserved.
关键词	ammonia ammonium formate ammonium sulfate nitrogen organic matter ammonium compound asteroid experimental study nitrogen salt spectral reflectance Article astronomy chemical reaction concentration (parameter)molecular weight physical phase priority journal reflectometry sublimation (phase transition)synthesis
语种	英语
来源机构	Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/133635
推荐引用方式 GB/T 7714	Poch O.,Istiqomah I.,Quirico E.,et al. Ammonium salts are a reservoir of nitrogen on a cometary nucleus and possibly on some asteroids[J]. Science,2020,367(6483).
APA	Poch O..,Istiqomah I..,Quirico E..,Beck P..,Schmitt B..,...&Tosi F..(2020).Ammonium salts are a reservoir of nitrogen on a cometary nucleus and possibly on some asteroids.,367(6483).
MLA	Poch O.,et al."Ammonium salts are a reservoir of nitrogen on a cometary nucleus and possibly on some asteroids".367.6483(2020).