A Multi-ringed, Modestly Inclined Protoplanetary Disk around AA Tau
- R. Loomis, K. Öberg, S. Andrews, M. MacGregor
- Physics, Geology
- 6 April 2017
AA Tau is the archetype for a class of stars with a peculiar periodic photometric variability thought to be related to a warped inner disk structure with a nearly edge-on viewing geometry. We present…
Discovery of the interstellar chiral molecule propylene oxide (CH3CHCH2O)
- B. McGuire, P. B. Carroll, G. Blake
- PhysicsScience
- 17 June 2016
Propylene oxide is detected in the gas phase in a cold, extended molecular shell around the embedded, massive protostellar clusters in the Sagittarius B2 star-forming region, representative of the earliest stage of solar system evolution in which a chiral molecule has been found.
FIRST DETECTION OF GAS-PHASE METHANOL IN A PROTOPLANETARY DISK
The first detection of gas-phase methanol in a protoplanetary disk (TW Hya) is presented. In addition to being one of the largest molecules detected in disks to date, methanol is also the first disk…
THE COUPLED PHYSICAL STRUCTURE OF GAS AND DUST IN THE IM Lup PROTOPLANETARY DISK
- L. Cleeves, K. Öberg, I. Czekala
- Physics, Geology
- 3 October 2016
The spatial distribution of gas and solids in protoplanetary disks determines the composition and formation efficiency of planetary systems. A number of disks show starkly different distributions for…
An ALMA Survey of DCN/H13CN and DCO+/H13CO+ in Protoplanetary Disks
- Jane Huang, K. Öberg, D. Wilner
- Physics, Geology
- 6 January 2017
The deuterium enrichment of molecules is sensitive to their formation environment. Constraining patterns of deuterium chemistry in protoplanetary disks is therefore useful for probing how material is…
Nitrogen Fractionation in Protoplanetary Disks from the H13CN/HC15N Ratio
- V. Guzm'an, K. Öberg, J. Huang, R. Loomis, C. Qi
- Physics, Geology
- 25 January 2017
Nitrogen fractionation is commonly used to assess the thermal history of solar system volatiles. With ALMA it is for the first time possible to directly measure 14 N / 15 N ratios in common molecules…
The comet-like composition of a protoplanetary disk as revealed by complex cyanides
It is found that the abundance ratios of these nitrogen-bearing organics in the gas phase are similar to those in comets, which implies that complex organics accompany simpler volatiles in protoplanetary disks, and that the rich organic chemistry of the authors' solar nebula was not unique.
N2 AND CO DESORPTION ENERGIES FROM WATER ICE
- E. Fayolle, J. Balfe, K. Öberg
- Physics, Chemistry
- 21 December 2015
The relative desorption energies of CO and N2 are key to interpretations of observed interstellar CO and N2 abundance patterns, including the well-documented CO and N2H+ anti-correlations in disks,…
H2CO Distribution and Formation in the TW HYA Disk
- K. Öberg, V. Guzmán, M. Hogerheijde
- Physics, Geology
- 12 April 2017
H2CO is one of the most readily detected organic molecules in protoplanetary disks. Yet its distribution and dominant formation pathway(s) remain largely unconstrained. To address these issues, we…
DETECTION OF E-CYANOMETHANIMINE TOWARD SAGITTARIUS B2(N) IN THE GREEN BANK TELESCOPE PRIMOS SURVEY
- D. Zaleski, Nathan A. Seifert, B. Pate
- Chemistry, Physics
- 5 February 2013
The detection of E-cyanomethanimine (E-HNCHCN) toward Sagittarius B2(N) is made by comparing the publicly available Green Bank Telescope (GBT) PRIMOS survey spectra to laboratory rotational spectra…
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