HCN observations of comets C/2013 R1 (Lovejoy) and C/2014 Q2 (Lovejoy)
Artikel i vetenskaplig tidskrift, 2016

HCN J = 1-0 emission from the long-period comet C/2013 R1 (Lovejoy) was observed from the Onsala Space Observatory on multiple occasions during the month before its perihelion passage on December 22, 2013. We report detections for seven different dates, spanning heliocentric distances (Rh) decreasing from 0.94 to 0.82 au. Estimated HCN production rates are generally higher than previously reported for the same time period, but the implied increase in production rate with heliocentric distance, QHCN Rh -3.2, represent well the overall documented increase since it was first observed at Rh = 1.35. The implied mean HCN abundance relative to water in R1 Lovejoy is 0.2%. We also report on a detection of HCN with the new 3 mm receiver system at Onsala Space Observatory in comet C/2014 Q2 (Lovejoy) on January 14, 2015, when its heliocentric distance was 1.3 au. Relative to comet C/2013 R1 (Lovejoy), the HCN production rate of C/2014 Q2 (Lovejoy) was more than 5 times higher at similar heliocentric distances, and the implied HCN abundance relative to water 0.09%.

Comets: individual: C/2014 Q2 (Lovejoy)

Comets: general

Comets: individual: C/2013 R1 (Lovejoy)

Radio lines: planetary systems

Författare

Eva Wirström

Chalmers, Rymd- och geovetenskap, Radioastronomi och astrofysik

Mikael Lerner

Chalmers, Rymd- och geovetenskap, Onsala rymdobservatorium

Philip Källström

Chalmers, Kemi och kemiteknik

Alexander Levinsson

Chalmers, Fysik

Astrid Olivefors

Chalmers, Kemi och kemiteknik

Elin Tegehall

Chalmers, Kemi och kemiteknik

Astronomy and Astrophysics

0004-6361 (ISSN) 1432-0746 (eISSN)

Vol. 588 Art. no. A72- A72

Ämneskategorier

Astronomi, astrofysik och kosmologi

DOI

10.1051/0004-6361/201527482

Mer information

Skapat

2017-10-07