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An extreme amplitude, massive heartbeat system in the LMC characterized using ASAS-SN and TESS
Kochanek, C. S.; Stanek, K. Z.; Thompson, Todd A. +3 more
Using ASAS-SN data, we find that the bright (V∼ 13.5 mag) variable star MACHO 80.7443.1718 (ASASSN-V J052624.38-684705.6) is the most extreme heartbeat star yet discovered. This massive binary, consisting of at least one early B-type star, has an orbital period of P_ASAS-SN=32.83627± 0.00846 d, and is located towards the LH58 OB complex in the LMC…
Characteristics of a Gradual Filament Eruption and Subsequent CME Propagation in Relation to a Strong Geomagnetic Storm
Wang, Rui; Liu, Ying D.; Hu, Huidong +3 more
An unexpected strong geomagnetic storm occurred on 2018 August 26, which was caused by a slow coronal mass ejection (CME) from a gradual eruption of a large quiet-region filament. We investigate the eruption and propagation characteristics of this CME in relation to the strong geomagnetic storm with remote sensing and in situ observations. Coronal…
New transiting hot Jupiters discovered by WASP-South, Euler/CORALIE, and TRAPPIST-South
Bouchy, F.; Queloz, D.; Hellier, Coel +16 more
We report the discovery of eight hot-Jupiter exoplanets from the WASP-South transit survey. WASP-144b has a mass of 0.44 MJup, a radius of 0.85 RJup, and is in a 2.27-d orbit around a V = 12.9, K2 star which shows a 21-d rotational modulation. WASP-145Ab is a 0.89 MJup planet in a 1.77-d orbit with a grazing transi…
Deep multi-survey classification of variable stars
Becker, I.; Pichara, K.; Aguirre, C.
During the last decade, a considerable amount of effort has been made to classify variable stars using different machine-learning techniques. Typically, light curves are represented as vectors of statistical descriptors or features that are used to train various algorithms. These features demand high computational power and can last from hours to …
Gaia DR2 distances to Collinder 419 and NGC 2264 and new astrometric orbits for HD 193 322 Aa,Ab and 15 Mon Aa,Ab
Maíz Apellániz, J.
Context. On the one hand, the second data release of the Gaia mission (Gaia DR2) has opened a trove of astrometric and photometric data for Galactic clusters within a few kiloparsecs of the Sun. On the other hand, lucky imaging has been an operational technique to measure the relative positions of visual binary systems for a decade and a half. Thi…
A search for red giant solar-like oscillations in all Kepler data
García, Rafael A.; Sharma, Sanjib; Stello, Dennis +4 more
The recently published Kepler mission Data Release 25 (DR25) reported on ∼197 000 targets observed during the mission. Despite this, no wide search for red giants showing solar-like oscillations have been made across all stars observed in Kepler's long-cadence mode. In this work, we perform this task using custom apertures on the Kepler pixel file…
CO observations of major merger pairs at z = 0: molecular gas mass and star formation
Yun, Min S.; Gao, Yu; Domingue, Donovan L. +4 more
We present CO observations of 78 spiral galaxies in local merger pairs. These galaxies represent a subsample of a Ks-band-selected sample consisting of 88 close major-merger pairs (HKPAIRs), 44 spiral-spiral (S+S) pairs, and 44 spiral-elliptical (S+E) pairs, with separation <20 h-1 kpc and mass ratio <2.5. For all objec…
The K2 Galactic Caps Project - going beyond the Kepler field and ageing the Galactic disc
Khan, S.; Valentini, M.; García, R. A. +21 more
Analyses of data from spectroscopic and astrometric surveys have led to conflicting results concerning the vertical characteristics of the Milky Way. Ages are often used to provide clarity, but typical uncertainties of >40 per cent from photometry restrict the validity of the inferences made. Using the Kepler APOKASC sample for context, we expl…
Accretion Kinematics in the T Tauri Binary TWA 3A: Evidence for Preferential Accretion onto the TWA 3A Primary
Johns-Krull, Christopher M.; Tofflemire, Benjamin M.; Mathieu, Robert D.
We present time-series, high-resolution optical spectroscopy of the eccentric T Tauri binary TWA 3A. Our analysis focuses on variability in the strength and structure of the accretion-tracing emission lines Hα and He I 5876 Å. We find emission line strengths to display the same orbital phase-dependent behavior found with time-series photometry, na…
Jellyfish: Ram Pressure Stripping As a Diagnostic Tool in Studies of Cluster Collisions
Ebeling, Harald; Kalita, Boris S.
Prompted by the discovery of A1758N_JFG1, a spectacular case of ram pressure stripping (RPS) in the galaxy cluster A1758N, we investigate the properties of other galaxies suspected to undergo RPS in this equal-mass, post-collision merger. Exploiting constraints derived from Hubble Space Telescope images and Keck longslit spectroscopy, our finding …