Search Publications
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…
Carbon dust in the evolved born-again planetary nebulae A 30 and A 78
Estrada-Dorado, S.; Guerrero, M. A.; Toalá, J. A. +6 more
We present an infrared (IR) characterization of the born-again planetary nebulae (PNe) A 30 and A 78 using IR images and spectra. We demonstrate that the carbon-rich dust in A 30 and A 78 is spatially coincident with the H-poor ejecta and coexists with hot X-ray-emitting gas up to distances of 50 arcsec from the central stars of PNe (CSPNe). Dust …
Evidence of Rocky Planet Engulfment in the Wide Binary System HIP 71726/HIP 71737
Meléndez, Jorge; Yana Galarza, Jhon; Lorenzo-Oliveira, Diego +1 more
Binary stars are supposed to be chemically homogeneous, as they are born from the same molecular cloud. However, high-precision chemical abundances show that some binary systems display chemical differences between the components, which could be due to planet engulfment. In this work, we determine precise fundamental parameters and chemical abunda…
Fermi-GBM Observations of GRB 210812A: Signatures of a Million Solar Mass Gravitational Lens
Veres, P.; Fraija, N.; Bhat, N. +1 more
Observing gravitationally lensed objects in the time domain is difficult, and well-observed time-varying sources are rare. Lensed gamma-ray bursts (GRBs) offer improved timing precision for this class of objects, complementing observations of quasars and supernovae. The rate of lensed GRBs is highly uncertain, approximately one in 1000. The Gamma-…
Ultralow Frequency Waves in Driving Jovian Aurorae Revealed by Observations From HST and Juno
Grodent, Denis; Bonfond, Bertrand; Wei, Yong +6 more
Large scale electrical currents and Alfvénic waves are the two main drivers responsible for producing planetary aurorae. The relative contribution of each process is a central question in terrestrial auroral science, and poorly understood for other planets due to the relatively rare opportunity of in situ spacecraft measurements. Here, we present …