論文

2021年8月1日

Six Outbursts of Comet 46P/Wirtanen

The Planetary Science Journal
  • Michael S. P. Kelley
  • ,
  • Tony L. Farnham
  • ,
  • Jian-Yang Li
  • ,
  • Dennis Bodewits
  • ,
  • Colin Snodgrass
  • ,
  • Johannes Allen
  • ,
  • Eric C. Bellm
  • ,
  • Michael W. Coughlin
  • ,
  • Andrew J. Drake
  • ,
  • Dmitry A. Duev
  • ,
  • Matthew J. Graham
  • ,
  • Thomas Kupfer
  • ,
  • Frank J. Masci
  • ,
  • Dan Reiley
  • ,
  • Richard Walters
  • ,
  • M. Dominik
  • ,
  • U. G. Jørgensen
  • ,
  • A. E. Andrews
  • ,
  • N. Bach-Møller
  • ,
  • V. Bozza
  • ,
  • M. J. Burgdorf
  • ,
  • J. Campbell-White
  • ,
  • S. Dib
  • ,
  • Y. I. Fujii
  • ,
  • T. C. Hinse
  • ,
  • M. Hundertmark
  • ,
  • E. Khalouei
  • ,
  • P. Longa-Peña
  • ,
  • M. Rabus
  • ,
  • S. Rahvar
  • ,
  • S. Sajadian
  • ,
  • J. Skottfelt
  • ,
  • J. Southworth
  • ,
  • J. Tregloan-Reed
  • ,
  • E. Unda-Sanzana

2
4
開始ページ
131
終了ページ
131
記述言語
掲載種別
研究論文(学術雑誌)
DOI
10.3847/psj/abfe11
出版者・発行元
American Astronomical Society

<title>Abstract</title>
Cometary activity is a manifestation of sublimation-driven processes at the surface of nuclei. However, cometary outbursts may arise from other processes that are not necessarily driven by volatiles. In order to fully understand nuclear surfaces and their evolution, we must identify the causes of cometary outbursts. In that context, we present a study of mini-outbursts of comet 46P/Wirtanen. Six events are found in our long-term lightcurve of the comet around its perihelion passage in 2018. The apparent strengths range from −0.2 to −1.6 mag in a 5″ radius aperture and correspond to dust masses between ∼104 and 106 kg, but with large uncertainties due to the unknown grain size distributions. However, the nominal mass estimates are on the same order of magnitude as the mini-outbursts at comet 9P/Tempel 1 and 67P/Churyumov-Gerasimenko, events that were notably lacking at comet 103P/Hartley 2. We compare the frequency of outbursts at the four comets, and suggest that the surface of 46P has large-scale (∼10–100 m) roughness that is intermediate to that of 67P and 103P, if not similar to the latter. The strength of the outbursts appear to be correlated with time since the last event, but a physical interpretation with respect to solar insolation is lacking. We also examine Hubble Space Telescope images taken about two days following a near-perihelion outburst. No evidence for macroscopic ejecta was found in the image, with a limiting radius of about 2 m.

リンク情報
DOI
https://doi.org/10.3847/psj/abfe11
URL
https://iopscience.iop.org/article/10.3847/PSJ/abfe11
URL
https://iopscience.iop.org/article/10.3847/PSJ/abfe11/pdf
ID情報
  • DOI : 10.3847/psj/abfe11
  • eISSN : 2632-3338

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