Search Publications
Missions
Journals
Publication Years
Metallicity of RR Lyrae stars from the Gaia Data Release 3 catalogue computed with Machine Learning algorithms
Garofalo, Alessia; Clementini, Gisella; Muraveva, Tatiana +2 more
We present new
VLTI/GRAVITY Observations of AF Lep b: Preference for Circular Orbits, Cloudy Atmospheres, and a Moderately Enhanced Metallicity
Pueyo, Laurent; Henning, Th.; Mollière, Paul +26 more
Direct imaging observations are biased toward wide-separation, massive companions that have degenerate formation histories. Although the majority of exoplanets are expected to form via core accretion, most directly imaged exoplanets have not been convincingly demonstrated to follow this formation pathway. We obtained new interferometric observatio…
Euclid preparation: LVIII. Detecting extragalactic globular clusters in the Euclid survey
Cimatti, A.; Ilbert, O.; Baccigalupi, C. +270 more
Extragalactic globular clusters (EGCs) are an abundant and powerful tracer of galaxy dynamics and formation, and their own formation and evolution is also a matter of extensive debate. The compact nature of globular clusters means that they are hard to spatially resolve and thus study outside the Local Group. In this work we have examined how well…
Classification of Periodic Variable Stars from TESS
Liu, Jifeng; Wang, Shu; Chen, Xiaodian +1 more
The number of known periodic variable stars has increased rapidly in recent years. As an all-sky transit survey, the Transiting Exoplanet Survey Satellite (TESS) plays an important role in detecting low-amplitude variable stars. Using 2 minute cadence data from the first 67 sectors of TESS, we find 72,505 periodic variable stars. We used 19 parame…
Millihertz oscillations near the innermost orbit of a supermassive black hole
Ingram, Adam; Fabian, Andrew C.; Remillard, Ronald A. +22 more
Recent discoveries from time-domain surveys are defying our expectations for how matter accretes onto supermassive black holes (SMBHs). The increased rate of short-timescale, repetitive events around SMBHs, including the recently discovered quasi-periodic eruptions1, 2, 3, 4–5, are garnering further interest in stellar-mass companions a…
Hawai'i Supernova Flows: a peculiar velocity survey using over a Thousand Supernovae in the near-infrared
Jones, David O.; Scolnic, Dan; Shappee, Benjamin J. +15 more
We introduce the Hawai'i Supernova Flows project and present summary statistics of the first 1217 astronomical transients observed, 668 of which are spectroscopically classified Type Ia Supernovae (SNe Ia). Our project is designed to obtain systematics-limited distances to SNe Ia while consuming minimal dedicated observational resources. To date, …
Investigating changing-look active galactic nuclei with long-term optical and X-ray observations
Diaz, Y.; Ricci, C.; Koss, M. +7 more
Context. Broad emission lines in the UV/optical spectra of changing-look active galactic nuclei (CLAGNs) appear and disappear on timescales of months to decades. Aims. We investigate how changing-look (CL) transitions depend on several active galactic nucleus (AGN) parameters, such as the accretion rate, obscuration properties, and black hole mass…
Abundance ties: Nephele and the globular cluster population accreted with ω Cen: Based on APOGEE DR17 and Gaia EDR3
Ryde, N.; Casamiquela, L.; Haywood, M. +8 more
Context. The peculiar Galactic globular cluster ω Centauri (NGC 5139) has drawn attention for its unique features, such as an unusually high stellar mass compared to other Galactic globular clusters and a broad distribution of chemical elements. These features have led to the hypothesis that ω Centauri might be the nuclear remnant of an ancient dw…
Discovery and Spectroscopic Confirmation of Aquarius III: A Low-mass Milky Way Satellite Galaxy
Geha, M.; James, D. J.; Li, T. S. +37 more
We present the discovery of Aquarius III, an ultra-faint Milky Way satellite galaxy identified in the second data release of the DECam Local Volume Exploration survey. Based on deeper follow-up imaging with DECam, we find that Aquarius III is a low-luminosity (
Closing the Stellar Labels Gap: Stellar Label independent Evidence for [α/M] Information in Gaia BP/RP Spectra
Speagle, Joshua S.; Laroche, Alexander
Data-driven models for stellar spectra that depend on stellar labels suffer from label systematics which decrease model performance: the stellar labels gap. To close the stellar labels gap, we present a stellar label independent model for Gaia BP/RP spectra. We develop a novel implementation of a variational auto-encoder, which learns to generate …