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X-shooter search for outgassing from Main Belt Comet P/2012 T1 (Pan-STARRS)

Snodgrass, C.; Yang, B. and Fitzsimmons, A. (2017). X-shooter search for outgassing from Main Belt Comet P/2012 T1 (Pan-STARRS). Astronomy & Astrophysics (Early Access).

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Context. Main Belt Comets are a recently identified population of minor bodies with stable asteroid-like orbits but cometary appearances. Sublimation of water ice is the most likely mechanism for their recurrent activity (i.e. dust tails and dust comae), although there has been no direct detection of gas. These peculiar objects could hold the key to the origin of water on Earth.

Aims. In this paper we present a search for the gas responsible for lifting dust from P/2012 T1 (Pan-STARRS), and review previous attempts at such measurements. To date such searches have mainly been indirect, looking for the common cometary gas CN rather than gasses related to water itself.

Methods. We use the VLT and X-shooter to search for emission from OH in the UV, a direct dissociation product of water.

Results. We do not detect any emission lines, and place an upper limit on water production rate from P/2012 T1 of 8 − 9 × 1025 molecules s−1. This is similar to limits derived from observations using the Herschel space telescope.

Conclusions. We conclude that the best current facilities are incapable of detecting water emission at the exceptionally low levels required to produce the observed activity in Main Belt Comets.

Item Type: Journal Item
Copyright Holders: 2017 ESO
ISSN: 0004-6361
Keywords: comets: individual: P/2012 T1 (Pan-STARRS); techniques: spectroscopic
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Research Group: Space
Item ID: 50190
Depositing User: Colin Snodgrass
Date Deposited: 17 Jul 2017 09:34
Last Modified: 15 Jun 2020 06:27
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