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Exocomets from a solar system perspective

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Strøm, Paul A., Bodewits, Dennis, Knight, Matthew M., Kiefer, Flavien, Jones, Geraint H., Kral, Quentin, Matrà, Luca, Bodman, Eva, Capria, Maria Teresa, Cleeves, Ilsedore et al.
(2020) Exocomets from a solar system perspective. Publications of the Astronomical Society of the Pacific, 132 (1061). 101001. doi:10.1088/1538-3873/aba6a0 ISSN 0004-6280.

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Official URL: https://doi.org/10.1088/1538-3873/aba6a0

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Abstract

Exocomets are small bodies releasing gas and dust which orbit stars other than the Sun. Their existence was first inferred from the detection of variable absorption features in stellar spectra in the late 1980s using spectroscopy. More recently, they have been detected through photometric transits from space, and through far-IR/mm gas emission within debris disks. As (exo)comets are considered to contain the most pristine material accessible in stellar systems, they hold the potential to give us information about early stage formation and evolution conditions of extra solar systems. In the solar system, comets carry the physical and chemical memory of the protoplanetary disk environment where they formed, providing relevant information on processes in the primordial solar nebula. The aim of this paper is to compare essential compositional properties between solar system comets and exocomets to allow for the development of new observational methods and techniques. The paper aims to highlight commonalities and to discuss differences which may aid the communication between the involved research communities and perhaps also avoid misconceptions. The compositional properties of solar system comets and exocomets are summarized before providing an observational comparison between them. Exocomets likely vary in their composition depending on their formation environment like solar system comets do, and since exocomets are not resolved spatially, they pose a challenge when comparing them to high fidelity observations of solar system comets. Observations of gas around main sequence stars, spectroscopic observations of "polluted" white dwarf atmospheres and spectroscopic observations of transiting exocomets suggest that exocomets may show compositional similarities with solar system comets. The recent interstellar visitor 2I/Borisov showed gas, dust and nuclear properties similar to that of solar system comets. This raises the tantalising prospect that observations of interstellar comets may help bridge the fields of exocomet and solar system comets.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Comets, Kuiper Belt , Photometry , Planetary rings, Solar system, Spectrum analysis , Comets -- Spectra
Journal or Publication Title: Publications of the Astronomical Society of the Pacific
Publisher: Institute of Physics Publishing, Inc.
ISSN: 0004-6280
Official Date: 2020
Dates:
DateEvent
2020Published
16 September 2020Available
16 July 2020Accepted
Volume: 132
Number: 1061
Article Number: 101001
DOI: 10.1088/1538-3873/aba6a0
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access (Creative Commons)
Copyright Holders: © 2020. The Astronomical Society of the Pacific
Date of first compliant deposit: 25 August 2020
Date of first compliant Open Access: 24 September 2020
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
2014– 2020.4.01.16-0029 KOMEETEuropean Regional Development Fundhttp://dx.doi.org/10.13039/501100008530
UNSPECIFIEDUniversité Paris IX-Dauphinehttp://viaf.org/viaf/157822299
UNSPECIFIEDObservatoire de l'espacehttp://viaf.org/viaf/168126754
ST/S000240/1[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
UNSPECIFIEDIniciativa Científica Mileniohttp://viaf.org/viaf/130928259
UNSPECIFIED[NWO] Nederlandse Organisatie voor Wetenschappelijk Onderzoekhttp://dx.doi.org/10.13039/501100003246
UNSPECIFIEDJesus College, University of Cambridgehttp://dx.doi.org/10.13039/501100000644
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