Article
Astronomy & Astrophysics
J. R. Pardo, C. Cabezas, J. P. Fonfria, M. Agundez, B. Tercero, P. de Vicente, M. Guelin, J. Cernicharo
Summary: The study identified larger radicals MgC5N and MgC6H in IRC +10216, with column densities similar to those of shorter analogs, supporting previous research on magnesium-bearing molecules in the source. The presence of these large magnesium cyanides and acetylides can be explained by a two-step process involving radiative association and dissociative recombination of ionic complexes built from large cyanopolyynes and polyynes in IRC +10216.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
J. R. Pardo, J. Cernicharo, B. Tercero, C. Cabezas, C. Bermudez, M. Agundez, J. D. Gallego, F. Tercero, M. Gomez-Garrido, P. de Vicente, J. A. Lopez-Perez
Summary: This study presents the most sensitive spectral survey of CW Leo in the Q band to date, providing the most comprehensive view of the star from 31.0 to 50.3 GHz. The rotational diagrams constructed from the data offer valuable insights into the physical conditions and chemical content of the circumstellar envelope.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
J. R. Pardo, C. Cabezas, M. Agundez, B. Tercero, N. Marcelino, P. de Vicente, M. Guelin, J. Cernicharo
Summary: Integrations on IRC +10216 in the Q-band using the Yebes 40m telescope have achieved sub-millikelvin noise and discovered a series of lines related to heavier anions. Based on ab initio calculations and chemical models, it is determined that the most likely carrier is the C10H- anion, which would be the heaviest anion discovered in space through detected individual lines.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
G. Quintana-Lacaci, L. Velilla-Prieto, M. Agundez, J. P. Fonfria, J. Cernicharo, L. Decin, A. Castro-Carrizo
Summary: This study presents high angular resolution interferometric ALMA maps of VY CMa continuum and molecular emission, revealing the structure and different types of ejecta. The results suggest that two different mass loss processes occur in this massive star. These findings provide essential information for understanding the mass loss processes and further evolution of red supergiants.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
M. Van de Sande, T. J. Millar
Summary: Spherical asymmetries are common in the outflows of AGB stars, and the presence of a stellar companion can strongly influence the chemistry within the outflow. The effects depend on the intensity of UV radiation and the extinction experienced by the radiation. The balance between two-body reactions and photoreactions determines the outcome, with two-body reactions increasing chemical complexity within the outflow and photoreactions leading to a molecule-poor outflow. Solar-like companions have the largest effect.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
V Karambelkar, M. M. Kasliwal, P. Tisserand, G. C. Clayton, C. L. Crawford, S. G. Anand, T. R. Geballe, E. Montiel
Summary: It has been found that dLHdC stars have lower O-16/O-18 ratios compared to RCB stars. Future observations will help further confirm and quantify the difference in oxygen isotope ratios between these two classes of stars.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
M. Montarges, E. Cannon, A. de Koter, T. Khouri, E. Lagadec, P. Kervella, L. Decin, I. McDonald, W. Homan, L. B. F. M. Waters, R. Sahai, C. A. Gottlieb, J. Malfait, S. Maes, B. Pimpanuwat, M. Jeste, T. Danilovich, F. De Ceuster, M. van de Sande, D. Gobrecht, S. H. J. Wallstrom, K. T. Wong, I. El Mellah, J. Bolte, F. Herpin, A. M. S. Richards, A. Baudry, S. Etoka, M. D. Gray, T. J. Millar, K. M. Menten, H. S. P. Mueller, J. M. C. Plane, J. Yates, A. Zijlstra
Summary: Through the ATOMIUM project, we aim to investigate the dust-nucleation sites and morphologies of the circumstellar envelope of nearby evolved stars and explore various conditions in their environment, in order to enhance our understanding of how stellar convection, pulsations, and companions shape the dusty circumstellar medium.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
C. Cabezas, J. R. Pardo, M. Agundez, B. Tercero, N. Marcelino, Y. Endo, P. de Vicente, M. Guelin, J. Cernicharo
Summary: We detected a series of six lines in the ultra-deep Q-band integration towards IRC +10216, which are in harmonic relation with quantum numbers J(u) from 12 to 18. The lines are identified as HMgCCCN based on quantum chemical calculations. The rotational temperature and column density of HMgCCCN are determined as 17.1 +/- 2.8 K and (3.0 +/- 0.6) x 10(12) cm(-2) respectively. Additionally, we discovered sodium cyanoacetylide, NaCCCN, in space towards IRC +10216, and determined the rotational temperature and column density as 13.5 +/- 1.7 K and (1.2 +/- 0.2) x 10(11) cm(-2).
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Sergio Gamez-Valenzuela, Julio A. Alonso, Gonzalo Santoro, Jose Martinez
Summary: Titanium carbide molecular clusters are believed to form in the circumstellar envelopes of carbon-rich asymptotic giant branch (AGB) stars, but their detection has been challenging. Computational calculations of small TinCx clusters revealed three-dimensional structures, with absorption features that may aid in their identification in space. Most clusters have sizable electric dipole moments, allowing for detection through radioastronomical observations.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
S. Maes, M. Van de Sande, T. Danilovich, F. De Ceuster, L. Decin
Summary: Asymptotic giant branch (AGB) stars lose mass through stellar wind, forming vast circumstellar envelopes (CSE) that are ideal astrochemical laboratories. However, the impact of changes in the physical environment on chemical abundances in AGB outflows is not well understood. A systematic sensitivity study is crucial to estimate uncertainties in simulations and observations. In this study, we investigate the impact of varying outflow densities and temperature profiles on chemistry in the CSE, providing valuable insights for observational studies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
C. Sanchez Contreras, J. Alcolea, R. Rodriguez Cardoso, V Bujarrabal, A. Castro-Carrizo, G. Quintana-Lacaci, L. Velilla-Prieto, M. Santander-Garcia
Summary: In this study, we present ALMA continuum and molecular line emission maps of OH 231.8+4.2, which reveal the complex nebular structure and dynamics. We report the discovery of a rotating circumbinary disk and observe the expansive kinematics of the surrounding SS-outflow. Our findings suggest that the dense equatorial structure in OH 231.8+4.2 is most likely formed through wind Roche lobe overflow mass transfer.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
A. Baudry, K. T. Wong, S. Etoka, A. M. S. Richards, H. S. P. Mueller, F. Herpin, T. Danilovich, M. D. Gray, S. Wallstroem, D. Gobrecht, T. Khouri, L. Decin, C. A. Gottlieb, K. M. Menten, W. Homan, T. J. Millar, M. Montarges, B. Pimpanuwat, J. M. C. Plane, P. Kervella
Summary: ALMA can observe highly excited rotational and vibrational transitions of water and hydroxyl radical near stars, and map their distributions. It was found that water shows compact emission towards the central stars and extends up to twelve stellar radii or more in AGB and RSG stars. The emission and absorption features of hydroxyl radical reveal infall of matter and complex kinematics influenced by binarity.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
A. Coenegrachts, T. Danilovich, F. De Ceuster, L. Decin
Summary: This study analyzes the 3D distribution of NaCl around the AGB star IK Tau using de-projection and calculates the relative abundance of NaCl in different clumps. It finds a spiral-like distribution of NaCl and lower relative abundance in clumps closer to the star.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
D. T. Hoai, P. T. Nhung, M. N. Tan, P. Darriulat, P. N. Diep, N. B. Ngoc, T. T. Thai, P. Tuan-Anh
Summary: The morpho-kinematics of the circumstellar envelope of oxygen-rich AGB star R Leonis is studied using observations of molecular lines. Evidence is found for an episode of enhanced mass-loss a few centuries ago, producing a broad expanding shell. The structure of the shell is found to be inhomogeneous and patchy.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
P. T. Nhung, D. T. Hoai, P. Tuan-Anh, P. Darriulat, P. N. Diep, N. B. Ngoc, N. T. Phuong, T. T. Thai
Summary: The new ALMA observations of the circumstellar envelope of the oxygen-rich AGB star R Dor provide insights into the rotation, gas stream dynamics, and broadening of emission lines near the star. The study also reveals the presence of a cold SiO layer causing self-absorption of emission and the morphology of broad back-to-back outflows up to 100 au from the star, analyzed in finer detail than before.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Engineering, Aerospace
David Leisawitz, Edward Amatucci, Lynn Allen, Jonathan Arenberg, Lee Armus, Cara Battersby, James Bauer, Bobby G. Beaman, Ray Bell, Porfirio Beltran, Dominic Benford, Edward Bergin, Jeffrey Bolognese, Charles M. Bradford, Damon Bradley, Denis Burgarella, Sean Carey, Ruth Carter, J. D. (Danny) Chi, Asantha Cooray, James Corsetti, Thomas Dasto, Elvire De Beck, Kevin Denis, Christopher Derkacz, Larry Dewell, Michael DiPirro, Cleland P. Earle, Matthew East, Samantha Edgington, Kimberly Ennico, Louis Fantano, Greg Feller, David Folta, Jonathan Fortney, Benjamin J. Gavaresa, Joseph Generie, Maryvonne Gerin, Zachary Granger, Thomas P. Greene, Alex Griffiths, George Harpole, Keith Harvey, Frank Helmich, Lawrence Hilliard, Joseph Howard, Michael Jacoby, Anisa Jamil, Tracee Jamison, Lisa Kaltenegger, Tiffany Kataria, John S. Knight, Perry Knollenberg, Charles Lawrence, Paul Lightsey, Sarah Lipscy, Eric Mamajek, Gregory Martins, John C. Mather, Margaret Meixner, Gary Melnick, Stefanie Milam, Ted Mooney, Samuel H. Moseley, Desika Narayanan, Susan Neff, Thanh Nguyen, Alison Nordt, Jeffrey Olson, Deborah Padgett, Michael Petach, Susanna Petro, John Pohner, Klaus Pontoppidan, Alexandra Pope, Daniel Ramspacker, Alison Rao, Thomas Roellig, Itsuki Sakon, Carly Sandin, Karin Sandstrom, Douglas Scott, Len Seals, Kartik Sheth, Lawrence M. Sokolsky, Johannes Staguhn, John Steeves, Kevin Stevenson, Eric Stoneking, Kate Su, Kiarash Tajdaran, Steven Tompkins, Joaquin Vieira, Cassandra Webster, Martina C. Wiedner, Edward L. Wright, Chi Wu, Jonas Zmuidzinas
Summary: The Origins Space Telescope will trace the history of our origins using mid- and far-infrared wavelengths, providing powerful spectroscopic instruments and high sensitivity to answer questions regarding galaxy evolution, habitable planet formation, and the prevalence of life-bearing worlds in the Universe. Origins minimizes complexity in its design, leveraging technology from previous space telescopes and next-generation detector technology to achieve natural background-limited sensitivity.
JOURNAL OF ASTRONOMICAL TELESCOPES INSTRUMENTS AND SYSTEMS
(2021)
Article
Astronomy & Astrophysics
N. Biver, D. Bockelee-Morvan, J. Boissier, R. Moreno, J. Crovisier, D. C. Lis, P. Colom, M. A. Cordiner, S. N. Milam, N. X. Roth, B. P. Bonev, N. Dello Russo, R. J. Vervack, M. A. DiSanti
Summary: The results of a molecular survey of comet 46P/Wirtanen conducted in December 2018 using the IRAM 30-m and NOEMA radio telescopes have accurately determined gas outflow velocity and kinetic temperature, as well as derived abundances of various molecules. The comet was found to be relatively rich in methanol but relatively depleted in CO, CS, HNC, HNCO, and HCOOH.
ASTRONOMY & ASTROPHYSICS
(2021)
Letter
Astronomy & Astrophysics
G. L. Villanueva, M. Cordiner, P. G. J. Irwin, I. de Pater, B. Butler, M. Gurwell, S. N. Milam, C. A. Nixon, S. H. Luszcz-Cook, C. F. Wilson, V. Kofman, G. Liuzzi, S. Faggi, T. J. Fauchez, M. Lippi, R. Cosentino, A. E. Thelen, A. Moullet, P. Hartogh, E. M. Molter, S. Charnley, G. N. Arney, A. M. Mandell, N. Biver, A. C. Vandaele, K. R. de Kleer, R. Kopparapu
Article
Astronomy & Astrophysics
Nathan X. Roth, Stefanie N. Milam, Martin A. Cordiner, Dominique Bockelee-Morvan, Nicolas Biver, Jeremie Boissier, Dariusz C. Lis, Anthony J. Remijan, Steven B. Charnley
Summary: This study reports the first survey of molecular emission from cometary volatiles using standalone Atacama Compact Array (ACA) observations towards comet C/2015 ER61 (Pan-STARRS), revealing asymmetric outgassing patterns and identifying parent from daughter/distributed source species. The results show that HCN is consistent with direct nucleus release in C/2015 ER61, while other molecules may be associated with distributed sources in the coma. Additionally, the continuum emission suggests thermal emission of slowly moving outburst ejectas, indicating a total mass of 5-8 x 10(10) kg.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
M. A. Cordiner, I. M. Coulson, E. Garcia-Berrios, C. Qi, F. Lique, M. Zoltowski, M. de Val-Borro, Y-J Kuan, W-H Ip, S. Mairs, N. X. Roth, S. B. Charnley, S. N. Milam, W-L Tseng, Y-L Chuang
Summary: In this study, high-resolution CO observations and a new radiative transfer code were used to investigate the outgassing behavior of comet C/2016 R2. The total CO production rate was found to be in the range of (3.8 - 7.6) x 10(28) s(-1), with emission concentrated in a near-sunward jet and evidence of an extended source of CO emission.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Rogier A. Windhorst, Seth H. Cohen, Rolf A. Jansen, Jake Summers, Scott Tompkins, Christopher J. Conselice, Simon P. Driver, Haojing Yan, Dan Coe, Brenda Frye, Norman Grogin, Anton Koekemoer, Madeline A. Marshall, Rosalia O'Brien, Nor Pirzkal, Aaron Robotham, Russell E. Ryan, Christopher N. A. Willmer, Timothy Carleton, Jose M. Diego, William C. Keel, Paolo Porto, Caleb Redshaw, Sydney Scheller, Stephen M. Wilkins, S. P. Willner, Adi Zitrin, Nathan J. Adams, Duncan Austin, Richard G. Arendt, John F. Beacom, Rachana A. Bhatawdekar, Larry D. Bradley, Tom Broadhurst, Cheng Cheng, Francesca Civano, Liang Dai, Herve Dole, Jordan C. J. D'Silva, Kenneth J. Duncan, Giovanni G. Fazio, Giovanni Ferrami, Leonardo Ferreira, Steven L. Finkelstein, Lukas J. Furtak, Hansung B. Gim, Alex Griffiths, Heidi B. Hammel, Kevin C. Harrington, Nimish P. Hathi, Benne W. Holwerda, Rachel Honor, Jia-Sheng Huang, Minhee Hyun, Myungshin Im, Bhavin A. Joshi, Patrick S. Kamieneski, Patrick Kelly, Rebecca L. Larson, Juno Li, Jeremy Lim, Zhiyuan Ma, Peter Maksym, Giorgio Manzoni, Ashish Kumar Meena, Stefanie N. Milam, Mario Nonino, Massimo Pascale, Andreea Petric, Justin D. R. Pierel, Maria del Carmen Polletta, Huub J. A. Roettgering, Michael J. Rutkowski, Ian Smail, Amber N. Straughn, Louis-Gregory Strolger, Andi Swirbul, James A. A. Trussler, Lifan Wang, Brian Welch, J. Stuart B. Wyithe, Min Yun, Erik Zackrisson, Jiashuo Zhang, Xiurui Zhao
Summary: This paper provides an overview and details the rationale, methods, and initial findings of the PEARLS project, which utilizes NIRCam images to survey extragalactic areas. The project aims to study galaxy assembly, AGN growth, and First Light, and is expected to contribute significant insights to the field of astronomy.
ASTRONOMICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Haojing Yan, Seth H. Cohen, Rogier A. Windhorst, Rolf A. Jansen, Zhiyuan Ma, John F. Beacom, Chenxiaoji Ling, Cheng Cheng, Jia-Sheng Huang, Norman A. Grogin, S. P. Willner, Min Yun, Heidi B. Hammel, Stefanie N. Milam, Christopher J. Conselice, Simon P. Driver, Brenda Frye, Madeline A. Marshall, Anton Koekemoer, Christopher N. A. Willmer, Aaron Robotham, Jordan C. J. D'Silva, Jake Summers, Jeremy Lim, Kevin Harrington, Leonardo Ferreira, Jose Maria Diego, Nor Pirzkal, Stephen M. Wilkins, Lifan Wang, Nimish P. Hathi, Adi Zitrin, Rachana A. Bhatawdekar, Nathan J. Adams, Lukas J. Furtak, Peter Maksym, Michael J. Rutkowski, Giovanni G. Fazio
Summary: Using the first epoch of four-band NIRCam observations obtained by JWST, we have found eight F150W dropouts and eight F200W dropouts in the Spitzer IRAC Dark Field. The nature of these objects is unclear, but their properties are important for the JWST. If the observed color decrements are due to the Lyman break, these objects should have high redshifts. Spectroscopic identifications are urgently needed.
ASTROPHYSICAL JOURNAL LETTERS
(2023)
Article
Multidisciplinary Sciences
Michael S. P. Kelley, Henry H. H. Hsieh, Dennis Bodewits, Mohammad Saki, Geronimo L. L. Villanueva, Stefanie N. N. Milam, Heidi B. B. Hammel
Summary: Main-belt comets, located in the asteroid belt, show comet-like activity due to ice sublimation. A recent observation of main-belt comet 238P/Read using the James Webb Space Telescope revealed the presence of a water vapor coma but no significant CO2 gas coma. These findings suggest that main-belt comets are fundamentally different from other comets and could provide valuable insights into the volatile inventory and evolution of the early Solar System.
Article
Astronomy & Astrophysics
G. L. Villanueva, H. B. Hammel, S. N. Milam, V. Kofman, S. Faggi, C. R. Glein, R. Cartwright, L. Roth, K. P. Hand, L. Paganini, J. Spencer, J. Stansberry, B. Holler, N. Rowe-Gurney, S. Protopapa, G. Strazzulla, G. Liuzzi, G. Cruz-Mermy, M. El Moutamid, M. Hedman, K. Denny
Summary: The James Webb Space Telescope mapped and characterized a large water plume originating from Enceladus, showing sustained and uninterrupted plume activity for decades. The observations confirm a surface dominated by crystalline H2O ice and no other gaseous molecules were detected. These findings make Enceladus a prime target for the search for life in our Solar System, as it is likely connected to a large liquid water sub-surface ocean. The observations demonstrate the unique ability of the James Webb Space Telescope in exploring distant icy bodies and cryovolcanic plumes.
Article
Astronomy & Astrophysics
M. A. Cordiner, N. X. Roth, S. N. Milam, G. L. Villanueva, D. Bockelee-Morvan, A. J. Remijan, S. B. Charnley, N. Biver, D. C. Lis, C. Qi, B. P. Bonev, J. Crovisier, J. Boissier
Summary: Gas-phase molecules in the atmosphere of comet 46P/Wirtanen originate from direct outgassing and sublimation of icy grains in the near-nucleus coma. The spatial distribution of HCN, CH3OH, and CH3CN suggests their production by direct outgassing, while H2CO, CS, and HNC primarily come from distributed coma sources. These findings provide insights into the production and release mechanisms of cometary gases.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Maria N. Drozdovskaya, Dominique Bockelee-Morvan, Jacques Crovisier, Brett A. Mcguire, Nicolas Biver, Steven B. Charnley, Martin A. Cordiner, Stefanie N. Milam, Cyrielle Opitom, Anthony J. Remijan
Summary: The NH3/H2O ratio in comet C/2020 F3 (NEOWISE) is a few times lower than measurements for other comets at similar heliocentric distances. The abundance of NH3 may vary strongly with time depending on the amount of water-poor dust in the coma.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Nathan X. Roth, Stefanie N. Milam, Michael A. Disanti, Geronimo L. Villanueva, Sara Faggi, Boncho P. Bonev, Martin A. Cordiner, Anthony J. Remijan, Dominique Bockelee-Morvan, Nicolas Biver, Jacques Crovisier, Dariusz C. Lis, Steven B. Charnley, Emmanuel Jehin, Eva S. Wirstrom, Adam J. Mckay
Summary: The extraordinary outburst of Centaur 29P/Schwassmann-Wachmann 1 in September-October 2021 offered a valuable opportunity to study the composition of primitive Kuiper disk material. By conducting simultaneous multiwavelength spectroscopic observations, the researchers were able to detect CO emission and measure rotational temperatures, coma kinematics, and production rates for various molecules. The study suggests that the preservation of ices in cometary nuclei may be influenced by certain factors.
PLANETARY SCIENCE JOURNAL
(2023)
Article
Astronomy & Astrophysics
K. M. Yocum, O. H. Wilkins, J. C. Bardwell, S. N. Milam, P. A. Gerakines
Summary: The ortho-to-para ratio (OPR) of formaldehyde (H2CO) is used to estimate the formation temperature of molecules in interstellar environments. However, there is a lack of laboratory evidence to support the assumption that OPR is preserved during molecular formation.
ASTROPHYSICAL JOURNAL LETTERS
(2023)
Article
Engineering, Aerospace
Martina C. Wiedner, Susanne Aalto, Edward G. Amatucci, Andrey Baryshev, Cara Battersby, Victor Belitsky, Edwin A. Bergin, Bruno Borgo, Ruth C. Carter, Emmanuel Caux, Asantha Cooray, James A. Corsetti, Elvire De Beck, Yan Delorme, Vincent Desmaris, Michael J. Dipirro, Brian Ellison, Anna M. Di Giorgio, Martin Eggens, Juan-Daniel Gallego, Maryvonne Gerin, Paul F. Goldsmith, Christophe Goldstein, Frank Helmich, Fabrice Herpin, Richard E. Hills, Michiel R. Hogerheijde, Leslie K. Hunt, Willem Jellema, Geert Keizer, Jean-Michel Krieg, Gabby Kroes, Philippe Laporte, Andre Laurens, David T. Leisawitz, Dariusz C. Lis, Gregory E. Martins, Imran Mehdi, Margaret Meixnere, Gary Melnick, Stefanie N. Milam, David A. Neufeld, Napoleon Nguyen Tuong, Rene Plume, Klaus M. Pontoppidan, Benjamin Quertier-Dagorn, Christophe Risacher, Johannes G. Staguhn, Edward Tong, Serena Viti, Friedrich Wyrowski
Summary: HERO is the first detailed study of a heterodyne focal plane array receiver for space applications, providing the capability to observe with high spectral resolution and sensitivity over a wide far-infrared wavelength range, while allowing for simultaneous dual polarization and dual-frequency band operation.
JOURNAL OF ASTRONOMICAL TELESCOPES INSTRUMENTS AND SYSTEMS
(2021)
Article
Astronomy & Astrophysics
Nathan X. Roth, Stefanie N. Milam, Martin A. Cordiner, Dominique Bockelee-Morvan, Michael A. DiSanti, Jeremie Boissier, Nicolas Biver, Jacques Crovisier, Neil Dello Russo, Boncho P. Bonev, Chunhua Qi, Anthony J. Remijan, Steven B. Charnley, Erika L. Gibb, Miguel de Val-Borro, Emmanuel Jehin
Summary: The study detected CH3OH emission in comet 46P/Wirtanen using the Atacama Compact Array, revealing rapidly varying and anisotropic outgassing. The consistent blue offset of the line center suggests enhanced CH3OH sublimation from the sunward hemisphere of the comet, likely from icy grains. These results highlight the exceptional capabilities of the ACA for time-resolved measurements of comets like 46P/Wirtanen.
PLANETARY SCIENCE JOURNAL
(2021)