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Deciphering cometary outbursts: linking gas composition changes to trigger mechanisms
Mall, Urs; De Keyser, Johan; Berthelier, Jean-Jacques +9 more
Dust and gas outbursts are recurrent cometary phenomena, playing a crucial role in shaping the coma. Proposed outburst trigger mechanisms include cliff collapse, pressure pockets, and amorphous-to-crystalline phase transition of water ice; however, the underlying processes remain inadequately understood. In this study, we analyse Rosetta/ROSINA da…
GRB 231115A: A Nearby Magnetar Giant Flare or a Cosmic Short Gamma-Ray Burst?
Zhou, Hao; Jin, Zhi-Ping; Wang, Yun +3 more
There are two classes of gamma-ray transients with a duration shorter than 2 s. One consists of cosmic short gamma-ray bursts (GRBs) taking place in the deep Universe via the neutron star mergers, and the other is the magnetar giant flares (GFs) with energies of ∼1044 ‑ 1046 erg from "nearby" galaxies. Though the magnetar GFs…
The Outflow of The Protostar in B335. I.
Johnstone, Doug; Rieke, George; Rieke, Marcia J. +10 more
The isolated globule B335 contains a single, low-luminosity Class 0 protostar associated with a bipolar nebula and outflow system seen nearly perpendicular to its axis. We observed the innermost regions of this outflow as part of JWST/NIRCam Guaranteed Time Observations program 1187, primarily intended for wide-field slitless spectroscopy of backg…
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…