Search Publications
The distribution of globular clusters in kinematic spaces does not trace the accretion history of the host galaxy
Haywood, M.; Mastrobuono-Battisti, A.; Combes, F. +4 more
Context. Reconstructing how all the stellar components of the Galaxy formed and assembled over time by studying the properties of the stars that form it is the aim of Galactic archaeology. Thanks to the launch of the ESA Gaia astrometric mission and the development of many spectroscopic surveys in recent years, we are for the first time in the pos…
Sulphur monoxide emission tracing an embedded planet in the HD 100546 protoplanetary disk
Booth, Alice S.; Ilee, John D.; Walsh, Catherine +4 more
Molecular line observations are powerful tracers of the physical and chemical conditions across the different evolutionary stages of star, disk, and planet formation. The high angular resolution and unprecedented sensitivity of the Atacama Large Millimeter Array (ALMA) enables the current drive to detect small-scale gas structures in protoplanetar…
The 17 April 2021 widespread solar energetic particle event
Holmström, M.; Grande, M.; Palmerio, E. +46 more
Context. A complex and long-lasting solar eruption on 17 April 2021 produced a widespread solar energetic particle (SEP) event that was observed by five longitudinally well-separated observers in the inner heliosphere that covered distances to the Sun from 0.42 to 1 au: BepiColombo, Parker Solar Probe, Solar Orbiter, STEREO A, and near-Earth space…
JWST's PEARLS: Mothra, a new kaiju star at z = 2.091 extremely magnified by MACS0416, and implications for dark matter models
Grogin, Norman A.; Koekemoer, Anton M.; Pirzkal, Nor +28 more
We report the discovery of Mothra, an extremely magnified monster star, likely a binary system of two supergiant stars, in one of the strongly lensed galaxies behind the galaxy cluster MACS J0416.1−2403. Mothra is in a galaxy with spectroscopic redshift z = 2.091 in a portion of the galaxy that is parsecs away from the cluster caustic. The binary …
Significance mode analysis (SigMA) for hierarchical structures. An application to the Sco-Cen OB association
Meingast, Stefan; Alves, João; Großschedl, Josefa E. +3 more
We present a new clustering method, significance mode analysis (SigMA), for extracting co-spatial and co-moving stellar populations from large-scale surveys such as ESA Gaia. The method studies the topological properties of the density field in the multidimensional phase space. We validated SigMA on simulated clusters and find that it outperforms …
Gaia Data Release 3. Ellipsoidal variables with possible black hole or neutron star secondaries
Mazeh, T.; Audard, M.; Rimoldini, L. +10 more
As part of Gaia Data Release 3, a large number of ellipsoidal variables were identified with supervised classification. The periodic variability of these ellipsoidals is presumably induced by tidal interaction with a companion in a close binary system. We present 6306 short-period probable ellipsoidal variables with relatively large-amplitude Gaia…
The Fifth Catalogue of Nearby Stars (CNS5)
Reffert, Sabine; Golovin, Alex; Vani, Akash +3 more
Context. We present the compilation of the Fifth Catalogue of Nearby Stars (CNS5), based on astrometric and photometric data from Gaia EDR3 and HIPPARCOS and supplemented with parallaxes from ground-based astrometric surveys carried out in the infrared.
Aims: The aim of the CNS5 is to provide the most complete sample of objects in the solar n…
HYPerluminous quasars at the Epoch of ReionizatION (HYPERION): A new regime for the X-ray nuclear properties of the first quasars
Maiolino, R.; Fiore, F.; Done, C. +40 more
The existence of luminous quasars (QSOs) at the epoch of reionization (EoR; i.e., z > 6) powered by well-grown supermassive black holes (SMBHs) with masses ≳109 M⊙ challenges models of early SMBH formation and growth. To shed light on the nature of these sources, we started a multiwavelength program based on a sample of 18…
Gaia Data Release 3. Microlensing events from all over the sky
Audard, M.; Rimoldini, L.; Holl, B. +12 more
Context. One of the rarest types of variability is the phenomenon of gravitational microlensing, a transient brightening of a background star due to an intervening lensing object. Microlensing is a powerful tool for studying the invisible or otherwise undetectable populations in the Milky Way, including planets and black holes.
Aims: We descr…
Properties of flare events based on light curves from the TESS survey
Zhang, Liyun; Han, Xianming L.; Misra, Prabhakar +4 more
Aims: A stellar flare is a strong energy burst event. Understanding stellar flares is important for determining the properties of stellar magnetic activities. We aim to perform detailed statistical analyses on stellar flare characteristics in terms of the different stellar parameters using the light curves of the Transiting Exoplanet Survey S…