Search Publications
SN 2022jli: A Type Ic Supernova with Periodic Modulation of Its Light Curve and an Unusually Long Rise
Gromadzki, M.; Galbany, L.; Inserra, C. +42 more
We present multiwavelength photometry and spectroscopy of SN 2022jli, an unprecedented Type Ic supernova discovered in the galaxy NGC 157 at a distance of ≈ 23 Mpc. The multiband light curves reveal many remarkable characteristics. Peaking at a magnitude of g = 15.11 ± 0.02, the high-cadence photometry reveals periodic undulations of 12.5 ± 0.2 da…
Dust attenuation, dust content, and geometry of star-forming galaxies
van Dokkum, Pieter; van der Wel, Arjen; Nelson, Erica J. +11 more
We analyse the joint distribution of dust attenuation and projected axis ratios, together with galaxy size and surface brightness profile information, to infer lessons on the dust content and star/dust geometry within star-forming galaxies at 0 < z < 2.5. To do so, we make use of large observational data sets from KiDS + VIKING + HSC-SSP and…
The accretion history of the Milky Way - I. How it shapes globular clusters and dwarf galaxies
Hammer, Francois; Mamon, Gary A.; Bonifacio, Piercarlo +6 more
Halo inhabitants are individual stars, stellar streams, star, and globular clusters, and dwarf galaxies. Here we compare the two last categories that include objects of similar stellar mass, which are often studied as self-dynamical equilibrium systems. We discover that the half-light radius of globular clusters depends on their orbital pericentre…
Hyper-runaway and hypervelocity white dwarf candidates in Gaia Data Release 3: Possible remnants from Ia/Iax supernova explosions or dynamical encounters
Igoshev, Andrei P.; Hallakoun, Na'ama; Perets, Hagai
Type Ia and other peculiar supernovae (SNe) are thought to originate from the thermonuclear explosions of white dwarfs (WDs). Some of the proposed channels involve the ejection of a partly exploded WD (e.g. Iax SN remnant) or the companion of an exploding WD at extremely high velocities (>400 km s-1). Characterization of such hyper-r…
The GAPS Programme at TNG. XLII. A characterisation study of the multi-planet system around the 400 Myr-old star HD 63433 (TOI-1726)
Baratella, M.; Mallonn, M.; Scandariato, G. +34 more
Context. The GAPS collaboration is carrying out a spectroscopic and photometric follow-up of a sample of young stars with planets (age ≲600 Myr) to characterise planetary systems at the early stages of their evolution.
Aims: For more than 2 yr, we monitored with the HARPS-N spectrograph the 400 Myr-old star HD 63433, which hosts two close-in …
Gaia Data Release 3. The first Gaia catalogue of variable AGN
Gavras, Panagiotis; Audard, Marc; Clementini, Gisella +15 more
Context. One of the novelties of Gaia data release 3 (DR3) with respect to the previous data releases is the publication of the multiband light curves for about 1 million active galactic nuclei (AGN) and of the values of some parameters characterising their variability properties.
Aims: The goal of this work is the creation of a catalogue of …
Validating AU Microscopii d with Transit Timing Variations
Barclay, Thomas; Triaud, Amaury H. M. J.; Dreizler, Stefan +31 more
AU Mic is a young (22 Myr), nearby exoplanetary system that exhibits excess transit timing variations (TTVs) that cannot be accounted for by the two known transiting planets nor stellar activity. We present the statistical "validation" of the tentative planet AU Mic d (even though there are examples of "confirmed" planets with ambiguous orbital pe…
Outflowing Helium from a Mature Mini-Neptune
Knutson, Heather A.; Dai, Fei; Bean, Jacob L. +2 more
We announce the detection of escaping helium from TOI 2134b, a mini-Neptune a few gigayears old. The average in-transit absorption spectrum shows a peak of 0.37% ± 0.05% and an equivalent width of W avg = 3.3 ± 0.3 mÅ. Among all planets with helium detections, TOI 2134b is the only mature mini-Neptune, has the smallest helium signal, an…
High-angular-resolution NIR view of the Orion Bar revealed by Keck/NIRC2
Le Gal, Romane; Bron, Emeric; Wolfire, Mark G. +7 more
Context. Nearby photo-dissociation regions (PDRs), where the gas and dust are heated by the far-ultraviolet (FUV) irradiation emitted from stars, are ideal templates with which to study the main stellar feedback processes.
Aims: With this study, we aim to probe the detailed structures at the interfaces between ionized, atomic, and molecular g…
Photometric and structural parameters of newly discovered nuclear star clusters in Local Volume galaxies
Neumayer, Nadine; Greene, Jenny E.; Seth, Anil C. +2 more
We use high-resolution Hubble Space Telescope imaging data of dwarf galaxies in the Local Volume ($\lesssim {11}\, \mathrm{Mpc}$) to parameterize 19 newly discovered nuclear star clusters (NSCs). Most of the clusters have stellar masses of $M_{\star }^{\mathrm{nsc}} \lesssim 10^{6}{\, {\rm M}_{\odot }}$ and compare to Galactic globular clusters in…