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Article: Water Production Rates and Activity of Interstellar Comet 2I/Borisov

TitleWater Production Rates and Activity of Interstellar Comet 2I/Borisov
Authors
KeywordsSmall solar system bodies
Exoplanet astronomy
Comets
Comet volatiles
Comet nuclei
Issue Date2020
PublisherAmerican Astronomical Society. The Journal's web site is located at http://iopscience.iop.org/2041-8205
Citation
The Astrophysical Journal Letters, 2020, v. 893 n. 2, article no. L48 How to Cite?
AbstractWe observed the interstellar comet 2I/Borisov using the Neil Gehrels Swift Observatory's Ultraviolet/Optical Telescope. We obtained images of the OH gas and dust surrounding the nucleus at six epochs spaced before and after perihelion (−2.56 to 2.54 au). Water production rates increased steadily before perihelion from (7.0 ± 1.5) × 1026 molecules s−1 on 2019 November 1, to (10.7 ± 1.2) × 1026 molecules s−1 on December 1. This rate of increase in water production rate is quicker than that of most dynamically new comets and at the slower end of the wide range of Jupiter-family comets. After perihelion, the water production rate decreased to (4.9 ± 0.9) × 1026 molecules s−1 on December 21, which is much more rapidly than that of all previously observed comets. Our sublimation model constrains the minimum radius of the nucleus to 0.37 km, and indicates an active fraction of at least 55% of the surface. A(0)fρ calculations show a variation between 57.5 and 105.6 cm with a slight trend peaking before the perihelion, lower than previous and concurrent published values. The observations confirm that 2I/Borisov is carbon-chain depleted and enriched in NH2 relative to water.
Persistent Identifierhttp://hdl.handle.net/10722/286282
ISSN
2019 Impact Factor: 8.198
2015 SCImago Journal Rankings: 3.369
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorXing, Z-
dc.contributor.authorBodewits, D-
dc.contributor.authorNoonan, J-
dc.contributor.authorBannister, MT-
dc.date.accessioned2020-08-31T07:01:44Z-
dc.date.available2020-08-31T07:01:44Z-
dc.date.issued2020-
dc.identifier.citationThe Astrophysical Journal Letters, 2020, v. 893 n. 2, article no. L48-
dc.identifier.issn2041-8205-
dc.identifier.urihttp://hdl.handle.net/10722/286282-
dc.description.abstractWe observed the interstellar comet 2I/Borisov using the Neil Gehrels Swift Observatory's Ultraviolet/Optical Telescope. We obtained images of the OH gas and dust surrounding the nucleus at six epochs spaced before and after perihelion (−2.56 to 2.54 au). Water production rates increased steadily before perihelion from (7.0 ± 1.5) × 1026 molecules s−1 on 2019 November 1, to (10.7 ± 1.2) × 1026 molecules s−1 on December 1. This rate of increase in water production rate is quicker than that of most dynamically new comets and at the slower end of the wide range of Jupiter-family comets. After perihelion, the water production rate decreased to (4.9 ± 0.9) × 1026 molecules s−1 on December 21, which is much more rapidly than that of all previously observed comets. Our sublimation model constrains the minimum radius of the nucleus to 0.37 km, and indicates an active fraction of at least 55% of the surface. A(0)fρ calculations show a variation between 57.5 and 105.6 cm with a slight trend peaking before the perihelion, lower than previous and concurrent published values. The observations confirm that 2I/Borisov is carbon-chain depleted and enriched in NH2 relative to water.-
dc.languageeng-
dc.publisherAmerican Astronomical Society. The Journal's web site is located at http://iopscience.iop.org/2041-8205-
dc.relation.ispartofThe Astrophysical Journal Letters-
dc.subjectSmall solar system bodies-
dc.subjectExoplanet astronomy-
dc.subjectComets-
dc.subjectComet volatiles-
dc.subjectComet nuclei-
dc.titleWater Production Rates and Activity of Interstellar Comet 2I/Borisov-
dc.typeArticle-
dc.identifier.emailXing, Z: zexixing@hku.hk-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.3847/2041-8213/ab86be-
dc.identifier.scopuseid_2-s2.0-85085985310-
dc.identifier.hkuros313286-
dc.identifier.volume893-
dc.identifier.issue2-
dc.identifier.spagearticle no. L48-
dc.identifier.epagearticle no. L48-
dc.identifier.isiWOS:000530504200001-
dc.publisher.placeUnited Kingdom-

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