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First Detection of HC5N in a Class II Disk around TW Hya
Steven C. Wampler, Ryan A. Loomis, Amina Diop +9
Over the last decade of ALMA's operation the molecular inventory of protoplanetary disks has expanded rapidly, revealing a diverse set of nitrogen-bearing organics and carbon-chain…
Molecules with ALMA at Planet-forming Scales (MAPS) XIII: HCO and disk ionization structure
Yuri Aikawa, Gianni Cataldi, Yoshihide Yamato +25
We observed HCO and HCO emission towards the five protoplanetary disks around IM Lup, GM Aur, AS 209, HD 163296, and MWC 480 as part of the MAPS proj…
Molecules with ALMA at Planet-forming Scales (MAPS) XI: CN and HCN as Tracers of Photochemistry in Disks
Jennifer B. Bergner, Karin I. Oberg, Viviana V. Guzman +23
UV photochemistry in the surface layers of protoplanetary disks dramatically alters their composition relative to previous stages of star formation. The abundance ratio CN/HCN has…
Molecules with ALMA at Planet-forming Scales (MAPS). X. Studying deuteration at high angular resolution toward protoplanetary disks
Gianni Cataldi, Yoshihide Yamato, Yuri Aikawa +26
Deuterium fractionation is dependent on various physical and chemical parameters. Thus, the formation location and thermal history of material in the solar system is often studied…
The TW Hya Rosetta Stone Project II: Spatially resolved emission of formaldehyde hints at low-temperature gas-phase formation
Jeroen Terwisscha van Scheltinga, Michiel R. Hogerheijde, L. Ilsedore Cleeves +15
Formaldehyde (HCO) is an important precursor to organics like methanol (CHOH). It is important to understand the conditions that produce HCO and prebiotic molecules dur…
The Excitation Conditions of CN in TW Hya
Richard Teague, Ryan Loomis
We report observations of the cyanide anion, CN, in the disk around TW~Hya covering the , and transitions. Using line stacking techniques, 24 hyperfine trans…
An unbiased ALMA spectral survey of the LkCa 15 and MWC 480 protoplanetary disks
Ryan A. Loomis, Karin I. Öberg, Sean M. Andrews +13
The volatile contents of protoplanetary disks both set the potential for planetary chemistry and provide valuable probes of defining disk system characteristics such as stellar mas…
An ALMA Survey of HCO in Protoplanetary Disks
Jamila Pegues, Karin I. Öberg, Jennifer B. Bergner +13
HCO is one of the most abundant organic molecules in protoplanetary disks and can serve as a precursor to more complex organic chemistry. We present an ALMA survey of HCO t…
Nine localised deviations from Keplerian rotation in the DSHARP circumstellar disks: Kinematic evidence for protoplanets carving the gaps
C. Pinte, D. J. Price, F. Menard +12
We present evidence for localised deviations from Keplerian rotation, i.e., velocity "kinks", in 8 of 18 circumstellar disks observed by the DSHARP program: DoAr 25, Elias 2-27, GW…
Realizing the Unique Potential of ALMA to Probe the Gas Reservoir of Planet Formation
L. Ilsedore Cleeves, Ryan Loomis, Richard Teague +21
Understanding the origin of the astonishing diversity of exoplanets is a key question for the coming decades. ALMA has revolutionized our view of the dust emission from protoplanet…
Constraining Gas-Phase Carbon, Oxygen, and Nitrogen in the IM Lup Protoplanetary Disk
L. Ilsedore Cleeves, Karin I. Oberg, David J. Wilner +4
We present new constraints on gas-phase C, N, and O abundances in the molecular layer of the IM Lup protoplanetary disk. Building on previous physical and chemical modeling of this…
Increased HCO production in the outer disk around HD 163296
M. T. Carney, M. R. Hogerheijde, R. A. Loomis +4
Three formaldehyde lines were observed (HCO 3--2, HCO 3--2, and HCO 3--2) in the protoplanetary disk around the Herbig Ae star…
An ALMA survey of DCN/HCN and DCO/HCO in protoplanetary disks
Jane Huang, Karin I. Oberg, Chunhua Qi +7
The deuterium enrichment of molecules is sensitive to their formation environment. Constraining patterns of deuterium chemistry in protoplanetary disks is therefore useful for prob…
The Coupled Physical Structure of Gas and Dust in the IM Lup Protoplanetary Disk
L. Ilsedore Cleeves, Karin I. Öberg, David J. Wilner +4
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 differen…
Cyanide photochemistry and fractionation in the MWC 480 disk
V. V. Guzmán, K. I. Öberg, R. Loomis +1
HCN is a commonly observed molecule in Solar System bodies and in interstellar environments. Its abundance with respect to CN is a proposed tracer of UV exposure. HCN is also frequ…