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The ultra-diffuse galaxy NGC 1052-DF2 with MUSE. II. The population of DF2: stars, clusters, and planetary nebulae
Emsellem, Eric; Müller, Oliver; Peng, Eric W. +13 more
NGC 1052-DF2, an ultra-diffuse galaxy (UDG), has been the subject of intense debate. Its alleged absence of dark matter, and the brightness and number excess of its globular clusters (GCs) at an initially assumed distance of 20 Mpc suggest a new formation channel for UDGs. We present the first systematic spectroscopic analysis of the stellar body …
The Massive and Distant Clusters of WISE Survey. I. Survey Overview and a Catalog of >2000 Galaxy Clusters at z ≃ 1
Chambers, Kenneth C.; Magnier, Eugene; Wright, Edward L. +23 more
We present the Massive and Distant Clusters of WISE Survey (MaDCoWS), a search for galaxy clusters at 0.7 ≲ z ≲ 1.5 based upon data from the Wide-field Infrared Survey Explorer (WISE) mission. MaDCoWS is the first cluster survey capable of discovering massive clusters at these redshifts over the full extragalactic sky. The search is divided into t…
The effect of stellar-mass black holes on the central kinematics of ω Cen: a cautionary tale for IMBH interpretations
Hénault-Brunet, Vincent; Gieles, Mark; Zocchi, Alice
The search for intermediate-mass black holes (IMBHs) in the centre of globular clusters is often based on the observation of a central cusp in the surface brightness profile and a rise towards the centre in the velocity dispersion profiles. Similar signatures, however, could result from other effects, that need to be taken into account in order to…
Open clusters in APOGEE and GALAH. Combining Gaia and ground-based spectroscopic surveys
Jordi, C.; Casamiquela, L.; Cantat-Gaudin, T. +7 more
Context. Open clusters are ideal laboratories to investigate a variety of astrophysical topics, from the properties of the Galactic disc to stellar-evolution models. Knowing their metallicity and possibly detailed chemical abundances is therefore important. However, the number of systems with chemical abundances determined from high-resolution spe…
TESS Delivers Its First Earth-sized Planet and a Warm Sub-Neptune
Butler, R. Paul; Vanderburg, Andrew; Latham, David W. +48 more
The future of exoplanet science is bright, as Transiting Exoplanet Survey Satellite (TESS) once again demonstrates with the discovery of its longest-period confirmed planet to date. We hereby present HD 21749b (TOI 186.01), a sub-Neptune in a 36 day orbit around a bright (V = 8.1) nearby (16 pc) K4.5 dwarf. TESS measures HD 21749b to be {2.61}
Sulfur Chemistry in Protoplanetary Disks: CS and H2CS
Bergner, Jennifer B.; Le Gal, Romane; Loomis, Ryan A. +2 more
The nature and abundance of sulfur chemistry in protoplanetary disks (PPDs) may impact the sulfur inventory on young planets and therefore their habitability. PPDs also offer an interesting test bed for sulfur chemistry models, since each disk shows a diverse set of environments. In this context, we present new sulfur molecule observations in PPDs…
Follow-up of the Neutron Star Bearing Gravitational-wave Candidate Events S190425z and S190426c with MMT and SOAR
Reichart, D. E.; Berger, E.; Chornock, R. +23 more
On 2019 April 25.346 and 26.640 UT the Laser Interferometer Gravitational-Wave Observatory (LIGO) and Virgo gravitational-wave (GW) observatory announced the detection of the first candidate events in Observing Run 3 that contained at least one neutron star (NS). S190425z is a likely binary neutron star (BNS) merger at d L = 156 ± 41 …
Exoplanet atmospheres with GIANO. II. Detection of molecular absorption in the dayside spectrum of HD 102195b
Sozzetti, A.; Giacobbe, P.; Bonomo, A. S. +4 more
Context. The study of exoplanetary atmospheres is key to understanding the differences between their physical, chemical, and dynamical processes. Until now, the bulk of atmospheric characterization analyses have been conducted on transiting planets. On a number of sufficiently bright targets, high-resolution spectroscopy (HRS) has also been succes…
A 5D view of the α Per, Pleiades, and Praesepe clusters
Smart, R. L.; Lodieu, N.; Pérez-Garrido, A. +1 more
Aims: Our scientific goal is to provide revised membership lists of the α Per, Pleiades, and Praesepe clusters exploiting the second data release of Gaia and produce five-dimensional maps (α, δ, π, µα cos δ, µδ) of these clusters.
Methods: We implemented the kinematic method combined with the statistical…
Constraints on a Bianchi type I spacetime extension of the standard Λ CDM model
Kumar, Suresh; Akarsu, Özgür; Sharma, Shivani +1 more
We consider the simplest anisotropic generalization, as a correction, to the standard Λ CDM model, by replacing the spatially flat Robertson-Walker metric by the Bianchi type-I metric, which brings in a new term Ωσ 0a-6 (mimicking the stiff fluid) in the average expansion rate H (a ) of the Universe. From Hubble and Pantheon …