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Detection of Propadiene on Titan

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Detection of Propadiene on Titan. / Lombardo, NA; Nixon, CA; Greathouse, TK; Bezard, B; Jolly, A; Vinatier, S; Teanby, Nick; Richter, MJ; Irwin, PGJ; Coustenis, A; Flasar, FM.

In: Astrophysical Journal Letters, Vol. 881, L33, 20.08.2019.

Research output: Contribution to journalArticle

Harvard

Lombardo, NA, Nixon, CA, Greathouse, TK, Bezard, B, Jolly, A, Vinatier, S, Teanby, N, Richter, MJ, Irwin, PGJ, Coustenis, A & Flasar, FM 2019, 'Detection of Propadiene on Titan', Astrophysical Journal Letters, vol. 881, L33. https://doi.org/10.3847/2041-8213/ab3860

APA

Lombardo, NA., Nixon, CA., Greathouse, TK., Bezard, B., Jolly, A., Vinatier, S., ... Flasar, FM. (2019). Detection of Propadiene on Titan. Astrophysical Journal Letters, 881, [L33]. https://doi.org/10.3847/2041-8213/ab3860

Vancouver

Lombardo NA, Nixon CA, Greathouse TK, Bezard B, Jolly A, Vinatier S et al. Detection of Propadiene on Titan. Astrophysical Journal Letters. 2019 Aug 20;881. L33. https://doi.org/10.3847/2041-8213/ab3860

Author

Lombardo, NA ; Nixon, CA ; Greathouse, TK ; Bezard, B ; Jolly, A ; Vinatier, S ; Teanby, Nick ; Richter, MJ ; Irwin, PGJ ; Coustenis, A ; Flasar, FM. / Detection of Propadiene on Titan. In: Astrophysical Journal Letters. 2019 ; Vol. 881.

Bibtex

@article{32dac245a48342dcbd5cba2f776abb3e,
title = "Detection of Propadiene on Titan",
abstract = "The atmosphere of Titan, the largest moon of Saturn, is rich in organic molecules, and it has been suggested that the moon may serve as an analog for the pre-biotic Earth due to its highly reducing chemistry and existence of global hazes. Photochemical models of Titan have predicted the presence of propadiene (historically referred to as allene), CH2CCH2, an isomer of the well-measured propyne (also called methylacetylene) CH3CCH, but its detection has remained elusive due to insufficient spectroscopic knowledge of the molecule. This has recently been remedied with an updated spectral line list. Here we present the first unambiguous detection of the molecule in any astronomical object, observed with the Texas Echelle Cross Echelle Spectrograph on the NASA Infrared Telescope Facility in 2017 July. We model its emission line near 12 μm and measure a volume mixing ratio of (6.9 ± 0.8) × 10−10 at 175 km, assuming a vertically increasing abundance profile as predicted in photochemical models. Cassini measurements of propyne made during 2017 April indicate that the abundance ratio of propyne to propadiene is 8.2 ± 1.1 at the same altitude. This initial measurement of the molecule in Titan's stratosphere paves the way toward constraining the amount of atomic hydrogen available on Titan, as well as future mapping of propadiene on Titan from 8 m and larger ground-based observatories, and future detection on other planetary bodies.",
keywords = "Saturnian satellites, Planetary atmospheres, Pre-biotic astrochemistry, Planetary science",
author = "NA Lombardo and CA Nixon and TK Greathouse and B Bezard and A Jolly and S Vinatier and Nick Teanby and MJ Richter and PGJ Irwin and A Coustenis and FM Flasar",
year = "2019",
month = "8",
day = "20",
doi = "10.3847/2041-8213/ab3860",
language = "English",
volume = "881",
journal = "Astrophysical Journal Letters",
issn = "2041-8205",
publisher = "IOP Publishing",

}

RIS - suitable for import to EndNote

TY - JOUR

T1 - Detection of Propadiene on Titan

AU - Lombardo, NA

AU - Nixon, CA

AU - Greathouse, TK

AU - Bezard, B

AU - Jolly, A

AU - Vinatier, S

AU - Teanby, Nick

AU - Richter, MJ

AU - Irwin, PGJ

AU - Coustenis, A

AU - Flasar, FM

PY - 2019/8/20

Y1 - 2019/8/20

N2 - The atmosphere of Titan, the largest moon of Saturn, is rich in organic molecules, and it has been suggested that the moon may serve as an analog for the pre-biotic Earth due to its highly reducing chemistry and existence of global hazes. Photochemical models of Titan have predicted the presence of propadiene (historically referred to as allene), CH2CCH2, an isomer of the well-measured propyne (also called methylacetylene) CH3CCH, but its detection has remained elusive due to insufficient spectroscopic knowledge of the molecule. This has recently been remedied with an updated spectral line list. Here we present the first unambiguous detection of the molecule in any astronomical object, observed with the Texas Echelle Cross Echelle Spectrograph on the NASA Infrared Telescope Facility in 2017 July. We model its emission line near 12 μm and measure a volume mixing ratio of (6.9 ± 0.8) × 10−10 at 175 km, assuming a vertically increasing abundance profile as predicted in photochemical models. Cassini measurements of propyne made during 2017 April indicate that the abundance ratio of propyne to propadiene is 8.2 ± 1.1 at the same altitude. This initial measurement of the molecule in Titan's stratosphere paves the way toward constraining the amount of atomic hydrogen available on Titan, as well as future mapping of propadiene on Titan from 8 m and larger ground-based observatories, and future detection on other planetary bodies.

AB - The atmosphere of Titan, the largest moon of Saturn, is rich in organic molecules, and it has been suggested that the moon may serve as an analog for the pre-biotic Earth due to its highly reducing chemistry and existence of global hazes. Photochemical models of Titan have predicted the presence of propadiene (historically referred to as allene), CH2CCH2, an isomer of the well-measured propyne (also called methylacetylene) CH3CCH, but its detection has remained elusive due to insufficient spectroscopic knowledge of the molecule. This has recently been remedied with an updated spectral line list. Here we present the first unambiguous detection of the molecule in any astronomical object, observed with the Texas Echelle Cross Echelle Spectrograph on the NASA Infrared Telescope Facility in 2017 July. We model its emission line near 12 μm and measure a volume mixing ratio of (6.9 ± 0.8) × 10−10 at 175 km, assuming a vertically increasing abundance profile as predicted in photochemical models. Cassini measurements of propyne made during 2017 April indicate that the abundance ratio of propyne to propadiene is 8.2 ± 1.1 at the same altitude. This initial measurement of the molecule in Titan's stratosphere paves the way toward constraining the amount of atomic hydrogen available on Titan, as well as future mapping of propadiene on Titan from 8 m and larger ground-based observatories, and future detection on other planetary bodies.

KW - Saturnian satellites

KW - Planetary atmospheres

KW - Pre-biotic astrochemistry

KW - Planetary science

U2 - 10.3847/2041-8213/ab3860

DO - 10.3847/2041-8213/ab3860

M3 - Article

VL - 881

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

SN - 2041-8205

M1 - L33

ER -