Optical spectroscopy of comet C/2014 Q2 (Lovejoy) from the Mount Abu Infrared Observatory

Venkataramani, Kumar; Ghetiya, S.; Ganesh, S.; Joshi, U.; Agnihotri, V. K.; Baliyan, K. S.

doi:10.1093/mnras/stw1820

Cited by 12 publications

(11 citation statements)

References 12 publications

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“…Production rates derived for C 2 (7.8 +3.2 / −2.3 × 10 26 molecules s −1 ) and CN (7.4 +3.6 / −2.4 × 10 26 molecules s −1 ) in late January of 2015 (Venkataramani et al 2016) are similar to production rates determined here about 1 week later for C 2 H 2 and HCN. This suggests that the primary sources of C 2 and CN in C/2014 Q2 (Lovejoy) during this time were C 2 H 2 and HCN, respectively.…”

Section: Parent−product Relationshipssupporting

confidence: 84%

“…Investigations of C/2014 Q2 (Lovejoy) have already revealed its detailed organic chemistry (Biver et al 2015) and volatile isotopic ratios (Biver et al 2016;Shinnaka & Kawakita 2016;Paganini et al 2017). Other longterm observations show asymmetric gas production around perihelion, with significantly higher productivity after perihelion (Venkataramani et al 2016;Combi et al 2018). Here we report IR spectroscopic observations of C/2014 Q2 (Lovejoy) with NIRSPEC at the W. M. Keck Observatory obtained on UT 2015 February 2 and 3 (hereafter all given dates are in UT) a few days after perihelion.…”

Section: Introductionmentioning

confidence: 99%

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Volatile Abundances, Extended Coma Sources, and Nucleus Ice Associations in Comet C/2014 Q2 (Lovejoy)

et al. 2022

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High-resolution infrared spectra of comet C/2014 Q2 Lovejoy were acquired with NIRSPEC at the W. M. Keck Observatory on two post-perihelion dates (UT 2015 February 2 and 3). H2O was measured simultaneously with CO, CH3OH, H2CO, CH4, C2H6, C2H4, C2H2, HCN, and NH3 on both dates, and rotational temperatures, production rates, relative abundances, H2O ortho-to-para ratios, and spatial distributions in the coma were determined. The first detection of C2H4 in a comet from ground-based observations is reported. Abundances relative to H2O for all species were found to be in the typical range compared with values for other comets in the overall population to date. There is evidence of variability in rotational temperatures and production rates on timescales that are small compared with the rotational period of the comet. Spatial distributions of volatiles in the coma suggest complex outgassing behavior. CH3OH, HCN, C2H6, and CH4 spatial distributions in the coma are consistent with direct release from associated ices in the nucleus and are peaked in a more sunward direction compared with co-measured dust. H2O spatial profiles are clearly distinct from these other four species, likely due to a sizable coma contribution from icy grain sublimation. Spatial distributions for C2H2, H2CO, and NH3 suggest substantial contributions from extended coma sources, providing further evidence for distinct origins and associations for these species in comets. CO shows a different spatial distribution compared with other volatiles, consistent with jet activity from discrete nucleus ice sources.

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Section: Parent−product Relationshipssupporting

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Volatile Abundances, Extended Coma Sources, and Nucleus Ice Associations in Comet C/2014 Q2 (Lovejoy)

et al. 2022

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“…For the short period comets where there are measured values of the radius, it is possible to calculate the active fractional area of the comet by using the Cowan and A'Hearn (1979) method for calculation of the active area assuming a rapidly rotating nucleus and the power-law fitted production rate at 1 AU, and dividing by 4πr N 2 , where r N is the radius of the comet, and water-driven sublimation from a dark nucleus. Errors in active fraction are driven by uncertainties in water production rates, determined nucleus radii, and the appropriateness of (2012) and that for C/2014 Q2 (Lovejoy) was taken from the observations of Venkataramani et al (2016). Table 5 shows the SWAN comets for which typical and depleted classifications can be inferred by measurements of C 2 , CN and OH.…”

Section: Soho/swan Survey Results -Short Period Cometsmentioning

confidence: 99%

A survey of water production in 61 comets from SOHO/SWAN observations of hydrogen Lyman-alpha: Twenty-one years 1996–2016

Combi

Mäkinen

Bertaux

et al. 2019

Icarus

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The Solar Wind Anisotropies (SWAN) instrument on the SOlar and Heliospheric Observatory (SOHO) satellite has observed 44 long period and new Oort cloud comets and 36 apparitions of 17 short period comets since its launch in December 1995. Water production rates have been determined from the over 3700 images producing a consistent set of activity variations over large parts of each comet's orbit.This has enabled the calculation of exponential power-law variations with heliocentric distance of these comets both before and after perihelion, as well as the absolute values of the water production rates.These various measures of overall water activity including pre-and post-perihelion exponents, absolute water production rates at 1 AU, active surface areas and their variations have been compared with a number of dynamical quantities for each comet including dynamical class, original semi-major axis, nucleus radius (when available), and compositional taxonomic class. Evidence for evolution of cometary nuclei is seen in both long-period and short-period comets.

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“…They conclude that the low polarization in the inner coma may be resulting from multiple scattering in a region of high dust concentration with probably recent dust jet ejecta. Venkataramani et al (2016) present low resolution spectra of comet C/2014 Q2 (Lovejoy) gathered in the period from January to May 2015, from perihelion passage to the post-perihelion phase. The spectra showed strong molecular emission bands (C 2 , C 3 and CN) close to perihelion.…”

Section: Polarimetrymentioning

confidence: 99%

Solar system studies with the Indo-Belgian telescopes

Ganesh¹,

Krishnakumar²,

Venkataramani³

et al. 2019

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Indian astronomers have been using their relatively modest instruments and telescopes to contribute greatly in understanding the minor bodies of the solar system. Here we discuss some of the results from observations using Indian facilities by researchers from India and abroad. Results are discussed in imaging/photometry, polarimetry and spectroscopy from the Indian telescopes up to 2 metres in aperture. It is hoped that access to the upcoming 2-m and 4-m class telescopes and sophisticated instrumentation would greatly improve our understanding with more exciting results coming up in future. Access to 2-m and 4-m class telescopes are one of the key points of the BINA collaboration. It is expected that our understanding of the solar system bodies, particularly the minor bodies and other small objects, would be greatly enhanced in terms of statistics as well as detailed characterization of individual ones.

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Optical spectroscopy of comet C/2014 Q2 (Lovejoy) from the Mount Abu Infrared Observatory

Cited by 12 publications

References 12 publications

Volatile Abundances, Extended Coma Sources, and Nucleus Ice Associations in Comet C/2014 Q2 (Lovejoy)

Volatile Abundances, Extended Coma Sources, and Nucleus Ice Associations in Comet C/2014 Q2 (Lovejoy)

A survey of water production in 61 comets from SOHO/SWAN observations of hydrogen Lyman-alpha: Twenty-one years 1996–2016

Solar system studies with the Indo-Belgian telescopes

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