Search Publications
Constraining the radial drift of millimeter-sized grains in the protoplanetary disks in Lupus
Williams, J. P.; Ansdell, M.; Facchini, S. +5 more
Context. Recent ALMA surveys of protoplanetary disks have shown that for most disks the extent of the gas emission is greater than the extent of the thermal emission of millimeter-sized dust. Both line optical depth and the combined effect of radially dependent grain growth and radial drift may contribute to this observed effect. To determine whet…
Supernova Interaction with a Dense Detached Shell in SN 2001em
Chandra, Poonam; Fransson, Claes; Chevalier, Roger A. +2 more
We carry out a comprehensive analysis of supernova SN 2001em covering a period of 19 yr since discovery. SN 2001em is the oldest supernova known to have undergone a metamorphosis from a stripped envelope to an interacting supernova. An early spectrum indicates it exploded as a Type Ib supernova. Later, the ejecta caught up with a dense circumstell…
ACCESS: A Visual to Near-infrared Spectrum of the Hot Jupiter WASP-43b with Evidence of H2O, but No Evidence of Na or K
Kirk, James; López-Morales, Mercedes; Alam, Munazza K. +11 more
We present a new ground-based visual transmission spectrum of the hot Jupiter WASP-43b, obtained as part of the ACCESS Survey. The spectrum was derived from four transits observed between 2015 and 2018, with combined wavelength coverage between 5300 and 9000 Å and an average photometric precision of 708 ppm in 230 Å bins. We perform an atmospheric…
Multiplicity of the red supergiant population in the young massive cluster NGC 330
Lennon, D. J.; Herrero, A.; de Koter, A. +7 more
Context. The multiplicity properties of massive stars are one of the important outstanding issues in stellar evolution. Quantifying the binary statistics of all evolutionary phases is essential to paint a complete picture of how and when massive stars interact with their companions, and to determine the consequences of these interactions.
Aim…
SHARP - VI. Evidence for CO (1-0) molecular gas extended on kpc-scales in AGN star-forming galaxies at high redshift
Vegetti, S.; McKean, J. P.; Rizzo, F. +8 more
We present a study of the stellar host galaxy, CO (1-0) molecular gas distribution and AGN emission on 50-500 pc-scales of the gravitationally lensed dust-obscured AGN MG J0751+2716 and JVAS B1938+666 at redshifts 3.200 and 2.059, respectively. By correcting for the lensing distortion using a grid-based lens modelling technique, we spatially locat…
PSR J1641+3627F: A Low-mass He White Dwarf Orbiting a Possible High-mass Neutron Star in the Globular Cluster M13
Cadelano, Mario; Pallanca, Cristina; Salaris, Maurizio +5 more
We report on the discovery of the companion star to the millisecond pulsar J1631+3627F in the globular cluster M13. By means of a combination of optical and near-UV high-resolution observations obtained with the Hubble Space Telescope, we identified the counterpart at the radio source position. Its location in the color-magnitude diagrams reveals …
Cometary Activity Discovered on a Distant Centaur: A Nonaqueous Sublimation Mechanism
Chandler, Colin Orion; Trujillo, Chadwick A.; Oldroyd, William J. +2 more
Centaurs are minor planets thought to have originated in the outer solar system region known as the Kuiper Belt. Active Centaurs enigmatically display comet-like features (e.g., tails, comae) even though they orbit in the gas giant region where it is too cold for water to readily sublimate. Only 18 active Centaurs have been identified since 1927 a…
Coronal Photopolarimetry with the LASCO-C2 Coronagraph over 24 Years [1996 - 2019]
Lamy, Philippe; Gilardy, Hugo; Llebaria, Antoine +3 more
We present an in-depth characterization of the polarimetric channel of the Large-Angle Spectrometric COronagraph/LASCO-C2 onboard the Solar and Heliospheric Observatory (SOHO). The polarimetric analysis of the white-light images makes use of polarized sequences composed of three images obtained though three polarizers oriented at +60∘, …
Abundance analyses of Li-enriched and normal giants in the GALAH survey
Lambert, David L.; Deepak; Reddy, Bacham E.
Compositions of lithium-enriched and normal giants among the GALAH survey are compared. Except for Li, the only detectable abundance difference between lithium-enriched and normal giants among the investigated elements from carbon to europium occurs for carbon. Among Li-rich giants with A(Li) = 1.8-3.1, the C deficiency is very similar to that rep…
The MUSE view of the planetary nebula NGC 3132
Monreal-Ibero, Ana; Walsh, Jeremy R.
Aims: Two-dimensional spectroscopic data for the whole extent of the NGC 3132 planetary nebula have been obtained. We deliver a reduced data-cube and high-quality maps on a spaxel-by-spaxel basis for the many emission lines falling within the Multi-Unit Spectroscopic Explorer (MUSE) spectral coverage over a range in surface brightness >100…