Ground-based multiwavelength observations of comet 103P/Hartley 2

A. Gicquel, S. N. Milam, G. L. Villanueva, A. J. Remijan, I. M. Coulson, Y. L. Chuang, S. B. Charnley, M. A. Cordiner, Y. J. Kuan

Research output: Contribution to journalArticle

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Abstract

The Jupiter-family comet 103P/Hartley 2 (103P) was the target of the NASA EPOXI mission. In support of this mission, we conducted observations from radio to submillimeter wavelengths of comet 103P in the three weeks preceding the spacecraft rendezvous on UT 2010 November 4.58. This time period included the passage at perihelion and the closest approach of the comet to the Earth. Here, we report detections of HCN, H2CO, CS, and OH and upper limits for HNC and DCN toward 103P using the Arizona Radio Observatory Kitt Peak 12 m telescope (ARO 12 m) and submillimeter telescope (SMT), the James Clerk Maxwell Telescope (JCMT), and the Green Bank Telescope (GBT). The water production rate, = (0.67-1.07) × 1028s-1, was determined from the GBT OH data. From the average abundance ratios of HCN and H2CO relative to water (0.13 ± 0.03% and 0.14 ± 0.03%, respectively), we conclude that H2CO is depleted and HCN is normal with respect to typically observed cometary mixing ratios. However, the abundance ratio of HCN with water shows a large diversity with time. Using the JCMT data, we measured an upper limit for the DCN/HCN ratio <0.01. Consecutive observations of ortho-H2CO and para-H2CO on November 2 (from data obtained at the JCMT) allowed us to derive an ortho:para ratio (OPR) of 2.12 ± 0.59 (1σ), corresponding to Tspin> 8 K (2σ).

Original languageEnglish
Article number1
JournalAstrophysical Journal
Volume794
Issue number1
DOIs
Publication statusPublished - 2014 Oct 10

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comets
comet
telescopes
radio
mixing ratio
Jupiter
water
space rendezvous
spacecraft
observatory
wavelength
mixing ratios
Jupiter (planet)
observatories
wavelengths

Keywords

  • astrobiology
  • comets: individual (103P/Hartley2)
  • radio lines: planetary systems
  • submillimeter: planetary systems
  • techniques: spectroscopic

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Gicquel, A., Milam, S. N., Villanueva, G. L., Remijan, A. J., Coulson, I. M., Chuang, Y. L., ... Kuan, Y. J. (2014). Ground-based multiwavelength observations of comet 103P/Hartley 2. Astrophysical Journal, 794(1), [1]. https://doi.org/10.1088/0004-637X/794/1/1

Ground-based multiwavelength observations of comet 103P/Hartley 2. / Gicquel, A.; Milam, S. N.; Villanueva, G. L.; Remijan, A. J.; Coulson, I. M.; Chuang, Y. L.; Charnley, S. B.; Cordiner, M. A.; Kuan, Y. J.

In: Astrophysical Journal, Vol. 794, No. 1, 1, 10.10.2014.

Research output: Contribution to journalArticle

Gicquel, A, Milam, SN, Villanueva, GL, Remijan, AJ, Coulson, IM, Chuang, YL, Charnley, SB, Cordiner, MA & Kuan, YJ 2014, 'Ground-based multiwavelength observations of comet 103P/Hartley 2', Astrophysical Journal, vol. 794, no. 1, 1. https://doi.org/10.1088/0004-637X/794/1/1
Gicquel A, Milam SN, Villanueva GL, Remijan AJ, Coulson IM, Chuang YL et al. Ground-based multiwavelength observations of comet 103P/Hartley 2. Astrophysical Journal. 2014 Oct 10;794(1). 1. https://doi.org/10.1088/0004-637X/794/1/1
Gicquel, A. ; Milam, S. N. ; Villanueva, G. L. ; Remijan, A. J. ; Coulson, I. M. ; Chuang, Y. L. ; Charnley, S. B. ; Cordiner, M. A. ; Kuan, Y. J. / Ground-based multiwavelength observations of comet 103P/Hartley 2. In: Astrophysical Journal. 2014 ; Vol. 794, No. 1.
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abstract = "The Jupiter-family comet 103P/Hartley 2 (103P) was the target of the NASA EPOXI mission. In support of this mission, we conducted observations from radio to submillimeter wavelengths of comet 103P in the three weeks preceding the spacecraft rendezvous on UT 2010 November 4.58. This time period included the passage at perihelion and the closest approach of the comet to the Earth. Here, we report detections of HCN, H2CO, CS, and OH and upper limits for HNC and DCN toward 103P using the Arizona Radio Observatory Kitt Peak 12 m telescope (ARO 12 m) and submillimeter telescope (SMT), the James Clerk Maxwell Telescope (JCMT), and the Green Bank Telescope (GBT). The water production rate, = (0.67-1.07) × 1028s-1, was determined from the GBT OH data. From the average abundance ratios of HCN and H2CO relative to water (0.13 ± 0.03{\%} and 0.14 ± 0.03{\%}, respectively), we conclude that H2CO is depleted and HCN is normal with respect to typically observed cometary mixing ratios. However, the abundance ratio of HCN with water shows a large diversity with time. Using the JCMT data, we measured an upper limit for the DCN/HCN ratio <0.01. Consecutive observations of ortho-H2CO and para-H2CO on November 2 (from data obtained at the JCMT) allowed us to derive an ortho:para ratio (OPR) of 2.12 ± 0.59 (1σ), corresponding to Tspin> 8 K (2σ).",
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