Search for ammonia in comet C/2012 S1 (ISON)

Comets are uniquely pristine bodies providing unique insights about the formation of our Solar System. In this work, we focus on a dynamically new comet as it enters the inner Solar System for the first time after residing for billion of years in the Oort Cloud. Such comets are particularly importan...

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Published in:Planetary and space science 2015-12, Vol.118, p.173-175
Main Authors: Faggi, S., Codella, C., Tozzi, G.P., Comoretto, G., Crovisier, J., Nesti, R., Panella, D., Boissier, J., Brucato, J.R., Bolli, P., Massi, F., Tofani, G.
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Language:English
Subjects:
Ammonia
Antennas
Astrophysics
Comets
Comets: individual: C/2012 S1 (ISON)
Emission
ISM: molecules
Oort cloud
Perihelions
Physics
Receivers
Searching
Techniques: radio observations
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cited_by cdi_FETCH-LOGICAL-c397t-f99332789758704eaa924e472bf5e3264ad783467c4ad4786383b0d19a019a713
cites cdi_FETCH-LOGICAL-c397t-f99332789758704eaa924e472bf5e3264ad783467c4ad4786383b0d19a019a713
container_end_page 175
container_issue
container_start_page 173
container_title Planetary and space science
container_volume 118
creator Faggi, S.
Codella, C.
Tozzi, G.P.
Comoretto, G.
Crovisier, J.
Nesti, R.
Panella, D.
Boissier, J.
Brucato, J.R.
Bolli, P.
Massi, F.
Tofani, G.
description Comets are uniquely pristine bodies providing unique insights about the formation of our Solar System. In this work, we focus on a dynamically new comet as it enters the inner Solar System for the first time after residing for billion of years in the Oort Cloud. Such comets are particularly important because they are thought to be not differentiated by solar radiation and they are supposed to have a large quantity of organic matter close to the surface. Here we report the results of a search for NH3(1,1) emission at 23.7GHz towards comet C/2012 S1 (ISON) using a new dual-feed K band receiver mounted on the Medicina 32-m antenna. We observed the comet close to its perihelion, from 25 to 29 November 2013, when its heliocentric distance changed from 0.25AU to 0.03AU. We derive an upper limit of Q(NH3) of about 2.5×1029mols−1 on 26 November, that is consistent with the last peak of water production rate of ∼2×1030mols−1 within the last few days before the perihelion.
doi_str_mv 10.1016/j.pss.2015.06.009
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subjects Ammonia
Antennas
Astrophysics
Comets
Comets: individual: C/2012 S1 (ISON)
Emission
ISM: molecules
Oort cloud
Perihelions
Physics
Receivers
Searching
Techniques: radio observations
title Search for ammonia in comet C/2012 S1 (ISON)
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