A Herschel Study of D/H in Water in the Jupiter-Family Comet 45P/Honda-Mrkos-Pajdusakova and Prospects for D/H Measurements with CCAT

Abstract

We present Herschel observations of water isotopologues in the atmosphere of the Jupiter-family comet 45P/Honda-Mrkos-Pajdusakova. No HDO emission is detected, with a 3 sigma upper limit of 2.0 10-4 for the D/H ratio. This value is consistent with the earlier Herschel measurement in the Jupiter-family comet 103P/Hartley 2. The canonical value of 3 10-4 measured pre-Herschel in a sample of Oort-cloud comets can be excluded at a 4.5 sigma level. The observations presented here further confirm that a diversity of D/H ratios exists in the comet population and emphasize the need for additional measurements with future ground-based facilities, such as CCAT, in the post-Herschel era.

To appear in The Astrophysical Journal Letters, 8 pages, 4 figures, 1 table

References in corpus (3)

• Building Terrestrial Planets
• HIFI Observations of Water in the Atmosphere of Comet C/2008 Q3 (Garradd)
• Water production in comet 81P/Wild 2 as determined by Herschel/HIFI

Cited by in corpus (25)

• Origin of water in the inner Solar System: Planetesimals scattered inward during Jupiter and Saturn's rapid gas accretion
• The habitability of Proxima Centauri b. I. Irradiation, rotation and volatile inventory from formation to the present
• The Delivery of Water During Terrestrial Planet Formation
• Isotopic ratios of H, C, N, O, and S in comets C/2012 F6 (Lemmon) and C/2014 Q2 (Lovejoy)
• Terrestrial deuterium-to-hydrogen ratio in water in hyperactive comets
• Chemo-dynamical deuterium fractionation in the early solar nebula: The origin of water on Earth and in asteroids and comets
• Water in Protoplanetary Disks: Deuteration and Turbulent Mixing
• The deuterium fractionation of water on solar-system scales in deeply-embedded low-mass protostars
• The Grand Tack model: a critical review
• The measured compositions of Uranus and Neptune from their formation on the CO iceline
• ALMA observations of water deuteration: A physical diagnostic of the formation of protostars
• Interferometric observations of warm deuterated methanol in the inner regions of low-mass protostars
• Water deuterium fractionation in the high-mass star-forming region G34.26+0.15 based on Herschel/HIFI data
• The Castalia Mission to Main Belt Comet 133P/Elst-Pizarro
• Moderate D/H Ratios in Methane Ice on Eris and Makemake as Evidence of Hydrothermal or Metamorphic Processes in Their Interiors: Geochemical Analysis
• Deuterium enrichment of ammonia produced by surface N+H/D addition reactions at low temperature
• Herschel observations of gas and dust in comet C/2006 W3 (Christensen) at 5 AU from the Sun
• A survey of volatile species in Oort cloud comets C/2001 Q4 (NEAT) and C/2002 T7 (LINEAR) at millimeter wavelengths
• Emission from HCN and CH${}_3$OH in comets. Onsala 20-m observations and radiative transfer modelling
• A high HDO/H${}_2$O ratio in the Class I protostar L1551 IRS5
• HDO ice detected toward an isolated low-mass protostar with JWST
• $\text{Herschel}$/SPIRE Observations of Water Production Rates and Ortho-to-Para Ratios in Comets
• An impact-free mechanism to deliver water to terrestrial planets and exoplanets
• Asteroids and Comets
• Cometary science with CUBES