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TIC 278956474: Two Close Binaries in One Young Quadruple System Identified by TESS
Borkovits, Tamás; Hellier, Coel; Latham, David W. +25 more
We have identified a quadruple system with two close eclipsing binaries in Transiting Exoplanet Survey Satellite (TESS) data. The object is unresolved in Gaia and appears as a single source at parallax 1.08 ± 0.01 mas. Both binaries have observable primary and secondary eclipses and were monitored throughout TESS Cycle 1 (sectors 1-13), falling wi…
Modelling hystereses observed during dwarf nova outbursts
Knigge, C.; Hameury, J. -M.; Lasota, J. -P. +2 more
Context. Although the disc instability model is widely accepted as the explanation for dwarf nova outbursts, it is still necessary to compare its predictions to observations because many of the constraints on angular momentum transport in accretion discs are derived from the application of this model to real systems.
Aims: We test the predict…
The galaxy population within the virial radius of the Perseus cluster
Apai, D.; Stecklum, B.; Meusinger, H. +3 more
Context. The Perseus cluster is one of the most massive nearby galaxy clusters and is fascinating in various respects. Though the galaxies in the central cluster region have been intensively investigated, an analysis of the galaxy population in a larger field is still outstanding.
Aims: This paper investigates the galaxies that are brighter t…
A magnetic snapshot survey of F-type stars
Neiner, C.; Folsom, C. P.; Marsden, S. C. +5 more
We present a spectropolarimetric magnetic snapshot survey of 55 stars which includes 53 F-type stars ranging from spectral types F0 to F9 plus 2 chemically peculiar stars β CrB, and δ Cap. We look for magnetic fields in stars spanning a range of effective temperatures where the transition from fossil to dynamo magnetic fields is believed to occur.…
The HR 1614 moving group is not a dissolving cluster
Casagrande, Luca; Feltzing, Sofia; Sahlholdt, Christian L. +3 more
Context. The HR 1614 is an overdensity in velocity space and has for a long time been known as an old (∼2 Gyr) and metal-rich ([Fe/H] ≈ +0.2) nearby moving group that has a dissolving open cluster origin. The existence of such old and metal-rich groups in the solar vicinity is quite unexpected since the vast majority of nearby moving groups are kn…
Tracing the Origins of the Ice Giants Through Noble Gas Isotopic Composition
Mousis, O.; Marty, B.; Mandt, K. E. +4 more
The current composition of giant planet atmospheres provides information on how such planets formed, and on the origin of the solid building blocks that contributed to their formation. Noble gas abundances and their isotope ratios are among the most valuable pieces of evidence for tracing the origin of the materials from which the giant planets fo…
Clumpiness: time-domain classification of red giant evolutionary states
Bell, Keaton J.; Hekker, Saskia; Kuszlewicz, James S.
Long, high-quality time-series data provided by previous space missions such as CoRoT and Kepler have made it possible to derive the evolutionary state of red giant stars, i.e. whether the stars are hydrogen-shell burning around an inert helium core or helium-core burning, from their individual oscillation modes. We utilize data from the Kepler mi…
Visible and near-infrared spectro-interferometric analysis of the edge-on Be star o Aquarii
Meilland, A.; Carciofi, A. C.; Domiciano de Souza, A. +11 more
Aims: We present a detailed visible and near-infrared spectro-interferometric analysis of the Be-shell star o Aquarii from quasi-contemporaneous CHARA/VEGA and VLTI/AMBER observations.
Methods: We analyzed spectro-interferometric data in the Hα (VEGA) and Brγ (AMBER) lines using models of increasing complexity: simple geometric models, k…
Mercury Dust Monitor (MDM) Onboard the Mio Orbiter of the BepiColombo Mission
Kimura, Hiroshi; Hasegawa, Sunao; Krüger, Harald +17 more
An in-situ cosmic-dust instrument called the Mercury Dust Monitor (MDM) had been developed as a part of the science payload for the Mio (Mercury Magnetospheric Orbiter, MMO) stage of the joint European Space Agency (ESA)-JAXA Mercury-exploration mission. The BepiColombo spacecraft was successfully launched by an Ariane 5 rocket on October 20, 2018…
A Year-long Superoutburst from an Ultracompact White Dwarf Binary Reveals the Importance of Donor Star Irradiation
Maccarone, T. J.; Rivera Sandoval, L. E.; Pichardo Marcano, M.
SDSS J080710+485259 is the longest-period outbursting ultracompact white dwarf binary. Its first-ever detected superoutburst started in 2018 November and lasted for a year, the longest detected so far for any short orbital period accreting white dwarf. Here we show the superoutburst duration of SDSS J080710+485259 exceeds the ∼2 month viscous time…