43 citations · 81 across the 8 of their papers we have counts for
12 papers
ALMA high resolution observations of Betelgeuse: Persistent structure spanning the inner atmosphere
W. R. F. Dent, A. M. S. Richards, G. M. Harper +2
The extended atmosphere of red supergiants (RSGs) forms an important link in the process of mass loss and the subsequent enrichment of the interstellar medium. Large-scale convecti…
New Spatially Resolved Observations of Betelgeuse from the VLA and ALMA: Evidence for Atmospheric Perturbations from a Close Companion
L. D. Matthews, A. K. Dupree, A. M. S. Richards +1
We present new spatially resolved observations of the red supergiant Betelgeuse ( Orionis) at seven frequencies: 22 GHz (1.36cm); 44 GHz (6.8mm); 107 GHz (2.8mm); 136 G…
Measuring Magnetic Fields Near and Far with the SKA via the Zeeman Effect
Timothy Robishaw, Marta Nowotka, Tao-Chung Ching +7
Zeeman splitting in spectral lines -- both in emission and absorption -- provides direct estimates of magnetic field strength and direction in magnetized gas in our own Milky Way a…
Evidence for the Keplerian orbit of a close companion around a giant star
Mats Esseldeurs, Leen Decin, Joris De Ridder +31
Close companions influence stellar evolution through tidal interactions, mass transfer, and mass loss effects. While such companions are detected around young stellar objects, main…
Molecules and Chemistry in Red Supergiants
Lucy M. Ziurys, Anita M. S. Richards
The envelopes of Red Supergiants (RSGs) have a unique chemical environment not seen in other types of stars. They foster an oxygen-rich synthesis but are tempered by sporadic and c…
The Infrared-Bright SW Knots in the Complex Ejecta of VY CMa
Roberta M. Humphreys, Terry J. Jones, Kris Davidson +4
The red hypergiant VY CMa is remarkable for its very visible record of high mass loss events observed over the range of wavelengths from the optical and infrared to the submillimet…
Detection of Rydberg lines from the atmosphere of Betelgeuse
W. R. F. Dent, G. Harper, A. M. S. Richards +2
Emission lines from Rydberg transitions are detected for the first time from a region close to the surface of Betelgeuse. The H30 line is observed at 231.905 GHz, with a FWHM ~4…
Resolved ALMA observations of water in the inner astronomical units of the HL Tau disk
Stefano Facchini, Leonardo Testi, Elizabeth Humphreys +7
The water molecule is a key ingredient in the formation of planetary systems, with the water snowline being a favourable location for the growth of massive planetary cores. Here we…
ALMA Observations of Supernova Remnant N49 in the Large Magellanic Cloud. II. Non-LTE Analysis of Shock-heated Molecular Clouds
H. Sano, Y. Yamane, J. Th. van Loon +28
We present the first compelling evidence of shock-heated molecular clouds associated with the supernova remnant (SNR) N49 in the Large Magellanic Cloud (LMC). Using CO( =…
Recovering Phosphine in Venus' Atmosphere from SOFIA Observations
Jane S. Greaves, Janusz J. Petkowski, Anita M. S. Richards +3
Searches for phosphine in Venus' atmosphere have sparked a debate. Cordiner et al. 2022 analyse spectra from the Stratospheric Observatory For Infrared Astronomy (SOFIA) and infer…
Magnetically aligned dust and SiO maser polarization in the envelope of the red supergiant VY CMa
W. H. T. Vlemmings, T. Khouri, I. Marti-Vidal +9
We use Atacama Large Millimeter/submillimeter Array Band 5 science verification observations of the red supergiant VY CMa to study the polarization of SiO thermal/masers lines and…
Measuring Magnetic Fields Near and Far with the SKA via the Zeeman Effect
Timothy Robishaw, James A. Green, Gabriele Surcis +12
The measurement of Zeeman splitting in spectral lines---both in emission and absorption---can provide direct estimates of the magnetic field strength and direction in atomic and mo…