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Chemical analysis of prestellar cores in Ophiuchus yields short timescales and rapid collapse
Wyrowski, Friedrich; Menten, Karl M.; Lupi, Alessandro +4 more
Sun-like stars form from the contraction of cold and dense interstellar clouds. How the collapse proceeds and what the main physical processes are driving it, however, is still under debate and a final consensus on the timescale of the process has not been reached. If the contraction proceeds slowly, supported by strong magnetic fields and mediate…
The GALAH survey: accreted stars also inhabit the Spite plateau
Lewis, Geraint F.; Ting, Yuan-Sen; Casey, Andrew R. +23 more
The European Space Agency (ESA) Gaia mission has enabled the remarkable discovery that a large fraction of the stars near the solar neighbourhood are debris from a single in-falling system, the so-called Gaia-Sausage-Enceladus (GSE). This discovery provides astronomers for the first time with a large cohort of easily observable, unevolved stars th…
Structure and Internal Kinematics of Nine Inner Milky Way Globular Clusters
Brown, Thomas M.; Cohen, Roger E.; Bellini, Andrea +3 more
This study constitutes part of a larger effort aimed at better characterizing the Galactic globular clusters (GGCs) located toward the inner Milky Way bulge and disk. Here, we focus on internal kinematics of nine GGCs, obtained from space-based imaging over time baselines of >9 yr. We exploit multiple avenues to assess the dynamical state of th…
Study of two interacting interplanetary coronal mass ejections encountered by Solar Orbiter during its first perihelion passage. Observations and modeling
Müller, D.; Perri, S.; Romoli, M. +46 more
Context. Solar Orbiter, the new-generation mission dedicated to solar and heliospheric exploration, was successfully launched on February 10, 2020, 04:03 UTC from Cape Canaveral. During its first perihelion passage in June 2020, two successive interplanetary coronal mass ejections (ICMEs), propagating along the heliospheric current sheet (HCS), im…
A Low-mass Cold and Quiescent Core Population in a Massive Star Protocluster
Sanhueza, Patricio; Smith, Howard A.; Qiu, Keping +23 more
Pre-stellar cores represent the initial conditions of star formation. Although these initial conditions in nearby low-mass star-forming regions have been investigated in detail, such initial conditions remain vastly unexplored for massive star-forming regions. We report the detection of a cluster of low-mass starless and pre-stellar core candidate…
Catalogue of exoplanets accessible in reflected starlight to the Nancy Grace Roman Space Telescope. Population study and prospects for phase-curve measurements
Rauer, H.; Csizmadia, Sz.; Cabrera, J. +3 more
Context. Reflected starlight measurements will open a new path in the characterization of directly imaged exoplanets. However, we still lack a population study of known targets to which this technique can be applied.
Aims: We investigate which of the about 4300 exoplanets confirmed to date are accessible for the Roman Space Telescope coronagr…
Impact of the Disk Thickness on X-Ray Reflection Spectroscopy Measurements
Tripathi, Ashutosh; Abdikamalov, Askar B.; Ayzenberg, Dimitry +2 more
In a previous paper, we presented an extension of our reflection model relxill_nk to include the finite thickness of the accretion disk following the prescription in Taylor & Reynolds. In this paper, we apply our model to fit the 2013 simultaneous observations by the Nuclear Spectroscopic Telescope Array (NuSTAR) and XMM-Newton of the supermas…
Revealing a peculiar supernova remnant G106.3+2.7 as a petaelectronvolt proton accelerator with X-ray observations
Liu, Ruo-Yu; Chen, Yang; Ge, Chong +2 more
Supernova remnants (SNRs) have long been considered as one of the most promising sources of Galactic cosmic rays. In the SNR paradigm, petaelectronvolt (PeV) proton acceleration may only be feasible at the early evolution stage, lasting a few hundred years, when the SNR shock speed is high. While evidence supporting the acceleration of PeV protons…
A high occurrence of nuclear star clusters in faint Coma galaxies, and the roles of mass and environment
Chies-Santos, Ana L.; Blakeslee, John P.; Sánchez-Janssen, Rubén +2 more
We use deep high-resolution Hubble Space Telescope (HST)/Advanced Camera for Surveys (ACS) imaging of two fields in the core of the Coma Cluster to investigate the occurrence of nuclear star clusters (NSCs) in quiescent dwarf galaxies as faint as MI = -10 mag. We employ a hierarchical Bayesian logistic regression framework to model the …
Characterizing the Gaia radial velocity sample selection function in its native photometry
Rix, Hans-Walter; Bailer-Jones, Coryn A. L.; Rybizki, Jan +2 more
The Gaia Data Release 2 (DR2) radial velocity sample (GDR2RVS), which provides six-dimensional phase-space information on 7.2 million stars, is of great value for inferring properties of the Milky Way. Yet a quantitative and accurate modelling of this sample is hindered without knowledge and inclusion of a well-characterized selection f…