Search Publications
An outburst and FU Ori-type disc of a former low-luminosity protostar
Herczeg, Gregory J.; Jose, Jessy; Johnstone, Doug +5 more
Strong accretion outbursts on to protostars are associated with emission dominated by a viscously heated disc, which is characterized by high luminosities. We report the discovery and characterization of a strong mid-IR (3.4, 4.6 µm) outburst in the embedded protostar SSTgbs J21470601+4739394 (hereafter SSTgbsJ214706). SSTgbsJ214706 has stea…
TESS giants transiting giants V - two hot Jupiters orbiting red giant hosts
Hellier, Coel; Quinn, Samuel N.; Zhou, George +24 more
In this work, we present the discovery and confirmation of two hot Jupiters orbiting red giant stars, TOI-4377 b and TOI-4551 b, observed by Transiting Exoplanet Survey Satellite in the Southern ecliptic hemisphere and later followed-up with radial-velocity (RV) observations. For TOI-4377 b, we report a mass of $0.957^{+0.089}_{-0.087} \ M_\mathrm…
FLASH: Faint Lenses from Associated Selection with Herschel
Serjeant, Stephen; Eales, Stephen; Bakx, Tom J. L. C. +5 more
We report the ALMA Band 7 observations of 86 Herschel sources that likely contain gravitationally lensed galaxies. These sources are selected with relatively faint 500 µm flux densities between 15 and 85 mJy in an effort to characterize the effect of lensing across the entire million-source Herschel catalogue. These lensed candidates were id…
The Power of High-precision Broadband Photometry: Tracing the Milky Way Density Profile with Blue Horizontal Branch Stars in the Dark Energy Survey
Lewis, Geraint F.; Erkal, Denis; Bland-Hawthorn, Joss +9 more
Blue horizontal branch stars (BHBs), excellent distant tracers for probing the Milky Way's halo density profile, are distinguished in the
Surviving in the Hot-Neptune Desert: The Discovery of the Ultrahot Neptune TOI-3261b
Quinn, Samuel N.; Fernández Fernández, Jorge; Wheatley, Peter J. +45 more
The recent discoveries of Neptune-sized ultra-short-period planets (USPs) challenge existing planet formation theories. It is unclear whether these residents of the Hot Neptune Desert have similar origins to smaller, rocky USPs, or if this discrete population is evidence of a different formation pathway altogether. We report the discovery of TOI-3…
A huge-amplitude white-light superflare on a L0 brown dwarf discovered by GWAC survey
Wang, Jing; Ren, Bin; Liang, En-Wei +21 more
White-light superflares from ultra-cool stars are thought to be resulted from magnetic reconnection, but the magnetic dynamics in a fully convective star is not clear yet. In this paper, we report a stellar superflare detected with the ground wide angle camera (GWAC), along with rapid follow-ups with the F60A, Xinglong 2.16-m, and LCOGT telescopes…
Optically thick structure in early B-type supergiant stellar winds at low metallicities
Oskinova, Lidia M.; Prinja, Raman K.; Fullerton, Alex W. +6 more
Accurate determination of mass-loss rates from massive stars is important to understand stellar and galactic evolution and enrichment of the interstellar medium. Large-scale structure and variability in stellar winds have significant effects on mass-loss rates. Time-series observations provide direct quantification of such variability. Observation…
Halo densities and pericenter distances of the bright Milky Way satellites as a test of dark matter physics
Andrade, Kevin E.; Kaplinghat, Manoj; Valli, Mauro
We provide new constraints on the dark matter halo density profile of Milky Way (MW) dwarf spheroidal galaxies (dSphs) using the phase-space distribution function (DF) method. After assessing the systematics of the approach against mock data from the Gaia Challenge project, we apply the DF analysis to the entire kinematic sample of well-measured M…
Transit spectroscopy of K2-33b with subaru/IRD: Spin-Orbit alignment and tentative atmospheric helium
Tamura, Motohide; Gaidos, Eric; Hirano, Teruyuki +13 more
Exoplanets in their infancy are ideal targets to probe the formation and evolution history of planetary systems, including the planet migration and atmospheric evolution and dissipation. In this paper, we present spectroscopic observations and analyses of two planetary transits of K2-33b, which is known to be one of the youngest transiting planets…
A comparative high-resolution spectroscopic analysis of in situ and accreted globular clusters
Massari, D.; Bellazzini, M.; Mucciarelli, A. +2 more
Globular clusters (GCs) are extremely intriguing systems that help in reconstructing the assembly of the Milky Way via the characterisation of their chemo-chrono-dynamical properties. In this study, we use high-resolution spectroscopic archival data from UVES and UVES-FLAMES at the VLT to compare the chemistry of GCs dynamically tagged as either G…