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Molecules with ALMA at Planet-forming Scales (MAPS) IV: Emission Surfaces and Vertical Distribution of Molecules
Charles J. Law, Richard Teague, Ryan A. Loomis +32
The Molecules with ALMA at Planet-forming Scales (MAPS) Large Program provides a unique opportunity to study the vertical distribution of gas, chemistry, and temperature in the pro…
Molecules with ALMA at Planet-forming Scales (MAPS) XII: Inferring the C/O and S/H ratios in Protoplanetary Disks with Sulfur Molecules
Romane Le Gal, Karin I. Öberg, Richard Teague +24
Sulfur-bearing molecules play an important role in prebiotic chemistry and planet habitability. They are also proposed probes of chemical ages, elemental C/O ratio, and grain chemi…
An ALMA Survey of Chemistry in Disks around M4-M5 Stars
Jamila Pegues, Karin I. Oberg, Jennifer B. Bergner +10
M-stars are the most common hosts of planetary systems in the Galaxy. Protoplanetary disks around M-stars thus offer a prime opportunity to study the chemistry of planet-forming en…
An SMA Continuum Survey of Circumstellar Disks in the Serpens Star-Forming Region
Charles J. Law, Luca Ricci, Sean M. Andrews +2
We present observations with the Submillimeter Array of the continuum emission at mm from 62 young stars surrounded by a protoplanetary disk in the Serpens star-forming re…
Direct evidence of multiple reservoirs of volatile nitrogen in a protosolar nebula analogue
Pierre Hily-Blant, Victor Magalhães, Joel Kastner +3
Isotopic ratios are keys to understanding the origin and early evolution of the solar system in the context of Galactic nucleosynthesis. The large range of measured N/$^{15}…
H2CO distribution and formation in the TW Hya disk
Karin I. Oberg, Viviana V. Guzman, Christopher J. Merchantz +8
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…
Nitrogen Fractionation in Protoplanetary Disks from the H13CN/HC15N Ratio
V. V. Guzmán, K. I. Öberg, J. Huang +2
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 14N/15N ratios in c…
Double DCO+ rings reveal CO ice desorption in the outer disk around IM Lup
Karin I. Oberg, Kenji Furuya, Ryan Loomis +5
In a protoplanetary disk, a combination of thermal and non-thermal desorption processes regulate where volatiles are liberated from icy grain mantles into the gas phase. Non-therma…
The cometary composition of a protoplanetary disk as revealed by complex cyanides
Karin I. Oberg, Viviana V. Guzman, Kenji Furuya +5
Observations of comets and asteroids show that the Solar Nebula that spawned our planetary system was rich in water and organic molecules. Bombardment brought these organics to the…
Physical and chemical structure of planet-forming disks probed by millimeter observations and modeling
Anne Dutrey, Dmitry Semenov, Edwige Chapillon +10
Protoplanetary disks composed of dust and gas are ubiquitous around young stars and are commonly recognized as nurseries of planetary systems. Their lifetime, appearance, and struc…
First detection of c-C3H2 in a circumstellar disk
Chunhua Qi, Karin Oberg, David Wilner +1
We report the first detection of c-C3H2 in a circumstellar disk. The c-C3H2 J=6-5 line (217.882 GHz) is detected and imaged through Atacama Large Millimeter Array (ALMA) Science Ve…
H2CO and N2H+ in Protoplanetary Disks: Evidence for a CO-ice Regulated Chemistry
Chunhua Qi, Karin Oberg, David Wilner
We present Submillimeter Array observations of H2CO and N2H+ emission in the disks around the T Tauri star TW Hya and the Herbig Ae star HD 163296 at 2"-6" resolution and discuss t…
Evidence for Multiple Pathways to Deuterium Enhancements in Protoplanetary Disks
Karin I. Oberg, Chunhua Qi, David J. Wilner +1
The distributions of deuterated molecules in protoplanetary disks are expected to depend on the molecular formation pathways. We use observations of spatially resolved DCN emission…
The Ionization Fraction in the DM Tau Protoplanetary Disk
Karin I. Oberg, Chunhua Qi, David J. Wilner +1
We present millimeter-wave observations of several molecular ions in the disk around the pre-main-sequence star DM Tau and use these to investigate the ionization fraction in diffe…
Disk Imaging Survey of Chemistry with SMA: II. Southern Sky Protoplanetary Disk Data and Full Sample Statistics
Karin I. Oberg, Chunhua Qi, Jeffrey K. J. Fogel +6
This is the second in a series of papers based on data from DISCS, a Submillimeter Array observing program aimed at spatially and spectrally resolving the chemical composition of 1…
Resolved Images of Large Cavities in Protoplanetary Transition Disks
Sean Andrews, David Wilner, Catherine Espaillat +5
Circumstellar disks are thought to experience a rapid "transition" phase in their evolution that can have a considerable impact on the formation and early development of planetary…
Disk Imaging Survey of Chemistry with SMA (DISCS): I. Taurus Protoplanetary Disk Data
Karin I. Oberg, Chunhua Qi, Jeffrey K. J. Fogel +5
Chemistry plays an important role in the structure and evolution of protoplanetary disks, with implications for the composition of comets and planets. This is the first of a series…