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XMM-Newton campaign on ultraluminous X-ray source NGC 1313 X-1: wind versus state variability
Guainazzi, M.; Fabian, A. C.; Pinto, C. +12 more
Most ultraluminous X-ray sources (ULXs) are thought to be powered by neutron stars and black holes accreting beyond the Eddington limit. If the compact object is a black hole or a neutron star with a magnetic field ≲1012 G, the accretion disc is expected to thicken and launch powerful winds driven by radiation pressure. Evidence of such…
Stellar masses of giant clumps in CANDELS and simulated galaxies using machine learning
Giavalisco, Mauro; Snyder, Gregory; Koekemoer, Anton +12 more
A significant fraction of high redshift star-forming disc galaxies are known to host giant clumps, whose nature and role in galaxy evolution are yet to be understood. In this work, we first present a new method based on neural networks to detect clumps in galaxy images. We use this method to detect clumps in the rest-frame optical and UV images of…
Chasing Accreted Structures within Gaia DR2 Using Deep Learning
Lisanti, Mariangela; Necib, Lina; Cohen, Timothy +3 more
In previous work, we developed a deep neural network classifier that only relies on phase-space information to obtain a catalog of accreted stars based on the second data release of Gaia (DR2). In this paper, we apply two clustering algorithms to identify velocity substructure within this catalog. We focus on the subset of stars with line-of-sight…
TOI-677b: A Warm Jupiter (P = 11.2 days) on an Eccentric Orbit Transiting a Late F-type Star
Trifonov, Trifon; Henning, Thomas; Barclay, Thomas +46 more
We report the discovery of TOI-677 b, first identified as a candidate in light curves obtained within Sectors 9 and 10 of the Transiting Exoplanet Survey Satellite (TESS) mission and confirmed with radial velocities. TOI-677 b has a mass of ${\text{}}{M}_{{\text{}}p} = ${1.236}_{-0.067}^{+0.069} ${\text{}}{M}_{{\rm{J}}}, a radius of ${\text{}}{R}_…
Analysis of Membership Probability in Nearby Young Moving Groups with Gaia DR2
Mathew, Blesson; Manoj, P.; Ujjwal, K. +2 more
We analyze the membership probability of young stars belonging to nearby moving groups with Gaia DR2 data. The sample of 1429 stars was identified from "The Catalog of Suspected Nearby Young Moving Group Stars." Good-quality parallax and proper motion values were retrieved for 890 stars from the Gaia DR2 database. The analysis for membership proba…
An Updated Small Magellanic Cloud and Magellanic Bridge Catalog of Star Clusters, Associations, and Related Objects
Barbuy, Beatriz; Bica, Eduardo; Santos, João F. C., Jr. +5 more
We present a catalog of star clusters, associations, and related extended objects in the Small Magellanic Cloud (SMC) and the Magellanic Bridge with 2741 entries, a factor 2 more than a previous version from a decade ago. Literature data up until 2018 December are included. The identification of star clusters was carried out with digital atlases i…
Gaia 18dvy: A New FUor in the Cygnus OB3 Association
Gromadzki, M.; Szabados, L.; Mugrauer, M. +60 more
We present optical-infrared photometric and spectroscopic observations of Gaia 18dvy, located in the Cygnus OB3 association at a distance of 1.88 kpc. Gaia 18dvy was noted by the Gaia alerts system when its light curve exhibited a ≳4 mag rise in 2018-2019. The brightening was also observable at mid-infared wavelengths. The infrared colors of Gaia …
The Cepheid Distance to the Seyfert 1 Galaxy NGC 4151
Ferrarese, L.; Vestergaard, M.; Peterson, B. M. +15 more
We derive a distance of 15.8 ± 0.4 Mpc to the archetypal Seyfert 1 galaxy NGC 4151 based on the near-infrared Cepheid period-luminosity relation and new Hubble Space Telescope multiband imaging. This distance determination, based on measurements of 35 long-period (P > 25 days) Cepheids, will support the absolute calibration of the supermassive …
Properties of M Dwarf Flares at Millimeter Wavelengths
Hughes, A. Meredith; Osten, Rachel A.; MacGregor, A. Meredith
We report on two millimeter flares detected by the Atacama Large Millimeter/submillimeter Array at 220 GHz from AU Mic, a nearby M dwarf. The larger flare had a duration of only ∼35 s, with peak LR = 2 × 1015 erg s-1 Hz-1, and lower limit on linear polarization of | Q/I| > 0.12 ± 0.04. We examine the …
TOI-503: The First Known Brown-dwarf Am-star Binary from the TESS Mission
Barclay, Thomas; Latham, David W.; Quinn, Samuel N. +78 more
We report the discovery of an intermediate-mass transiting brown dwarf (BD), TOI-503b, from the TESS mission. TOI-503b is the first BD discovered by TESS, and it has circular orbit around a metallic-line A-type star with a period of P = 3.6772 ± 0.0001 days. The light curve from TESS indicates that TOI-503b transits its host star in a grazing mann…