Search Publications
TOI-332 b: a super dense Neptune found deep within the Neptunian desert
Vanderburg, Andrew; Hellier, Coel; Latham, David W. +49 more
To date, thousands of planets have been discovered, but there are regions of the orbital parameter space that are still bare. An example is the short period and intermediate mass/radius space known as the 'Neptunian desert', where planets should be easy to find but discoveries remain few. This suggests unusual formation and evolution processes are…
The non-explosive stellar merging origin of the ultra-massive carbon-rich white dwarfs
Vennes, Stéphane; Ferrario, Lilia; Kawka, Adela
We have investigated the origin of a sub-class of carbon-polluted white dwarfs (DQ) originally identified as the "hot DQ" white dwarfs. These objects are relatively hot ($10\, 000\lesssim T_{\rm eff}\lesssim 25\, 000$ K), have markedly higher carbon abundance (C-enriched), are more massive (M ≳ 0.8 M⊙) than ordinary DQs (M ~ 0.6 M⊙…
Evidence for extended gaseous reservoirs around AGN at cosmic noon from ALMA CO(3-2) observations
Maiolino, R.; Fudamoto, Y.; Carniani, S. +3 more
Gaseous outflows are key phenomena in the evolution of galaxies, as they affect star formation (either positively or negatively), eject gas from the core or disc, and directly cause mixing of pristine and processed material. Active outflows may be detected through searches for broad spectral line emission or high-velocity gas, but it is also possi…
GMP-selected dual and lensed AGNs: Selection function and classification based on near-IR colors and resolved spectra from VLT/ERIS, Keck/OSIRIS, and LBT/LUCI
Sturm, E.; Marconi, A.; Vignali, C. +44 more
The Gaia Multipeak (GMP) technique can be used to identify large numbers of dual or lensed active galactic nucleus (AGN) candidates at subarcsec separation, allowing us to study both multiple supermassive black holes (SMBHs) in the same galaxy and rare, compact lensed systems. The observed samples can be used to test the predictions of the models …
Are JWST/NIRCam Color Gradients in the Lensed z = 2.3 Dusty Star-forming Galaxy El Anzuelo Due to Central Dust Attenuation or Inside-out Galaxy Growth?
Grogin, Norman A.; Koekemoer, Anton M.; Pirzkal, Nor +25 more
Gradients in the mass-to-light ratio of distant galaxies impede our ability to characterize their size and compactness. The long-wavelength filters of JWST's NIRCam offer a significant step forward. For galaxies at Cosmic Noon (z ~ 2), this regime corresponds to the rest-frame near-infrared, which is less biased toward young stars and captures emi…
Ongoing hierarchical massive cluster assembly: The LISCA II structure in the Perseus complex
Dalessandro, E.; Bellazzini, M.; Sanna, N. +7 more
We report on the identification of a massive (∼105 M⊙) substructured stellar system in the Galactic Perseus complex likely undergoing hierarchical cluster assembly. This system comprises nine star clusters (including the well-known clusters NGC 654 and NGC 663) and an extended and low-density stellar halo. Gaia-DR3 and availa…
Debris disk color with the Hubble Space Telescope
Debes, John H.; Roberge, Aki; Schneider, Glenn +14 more
Context. Multiwavelength scattered light imaging of debris disks may inform dust properties including typical size and mineral composition. Existing studies have investigated a small set of individual systems across a variety of imaging instruments and filters, calling for uniform comparison studies to systematically investigate dust properties. <…
Investigating the M GCS-M h Relation in the Most Massive Galaxies
Harris, William E.; Dornan, Veronika
The relation between the total mass contained in the globular clusters of a galaxy and the mass of its dark-matter halo has been found observationally to be nearly linear over five decades of mass. However, the high-mass end of this relation is not well determined from previous data and shows large scatter. We analyze the globular cluster systems …
WIYN Open Cluster Study. LXXXVII. Hubble Space Telescope Ultraviolet Detection of Hot White Dwarf Companions to Blue Lurkers in M67
Mathieu, Robert D.; Nine, Andrew C.; Gosnell, Natalie M. +1 more
We present the results of our Hubble Space Telescope far-ultraviolet survey of the blue lurkers (BLs) in M67. We find evidence for two white dwarf (WD) companions among the BLs that are indicative of mass transfer from an evolved companion, one in WOCS 14020 and the other in WOCS 3001. The cooling ages of the WDs suggest that mass transfer in thes…
Testing super-eddington accretion on to a supermassive black hole: reverberation mapping of PG 1119+120
Ho, Luis C.; Horne, Keith; Du, Pu +11 more
We measure the black hole mass and investigate the accretion flow around the local (z = 0.0502) quasar PG 1119+120. Spectroscopic monitoring with Calar Alto provides H β lags and linewidths from which we estimate a black hole mass of log (M•/M⊙) = 7.0, uncertain by ~0.4 dex. High cadence photometric monitoring over 2 yr with …