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Search for dormant black holes in ellipsoidal variables I. Revisiting the expected amplitudes of the photometric modulation
Gomel, Roy; Faigler, Simchon; Mazeh, Tsevi
Ellipsoidal variables present light-curve modulations caused by stellar distortion, induced by tidal interaction with their companions. An analytical approximated model of the ellipsoidal modulation is given as a discrete Fourier series by Morris & Naftilan. Based on numerical simulations using the PHOEBE code, we present here updated amplitud…
Gaia EDR3 in 6D: searching for unbound stars in the galaxy
Marchetti, Tommaso
The early third data release (EDR3) of the European Space Agency satellite Gaia provides coordinates, parallaxes, and proper motions for ∼1.47 billion sources in our Milky Way, based on 34 months of observations. The combination of Gaia DR2 radial velocities with the more precise and accurate astrometry provided by Gaia EDR3 makes the best data se…
A quantitative in-depth analysis of the prototype sdB+BD system SDSS J08205+0008 revisited in the Gaia era
Geier, S.; Dhillon, V. S.; Heber, U. +8 more
Subdwarf B stars are core-helium-burning stars located on the extreme horizontal branch (EHB). Extensive mass loss on the red giant branch is necessary to form them. It has been proposed that substellar companions could lead to the required mass loss when they are engulfed in the envelope of the red giant star. J08205+0008 was the first example of…
Jellyfish galaxy candidates in MACS J0717.5+3745 and 39 other clusters of the DAFT/FADA and CLASH surveys
Durret, F.; Jauzac, M.; Lobo, C. +1 more
Context. Galaxies in clusters undergo several phenomena, such as RPS and tidal interactions, that can trigger or quench their star formation and, in some cases, lead to galaxies acquiring unusual shapes and long tails - some become jellyfish.
Aims: We searched for jellyfish galaxy candidates in a sample of 40 clusters from the DAFT/FADA and C…
Modeling the 2012 May 17 Solar Energetic Particle Event Using the AWSoM and iPATH Models
Lario, D.; Li, Gang; de Nolfo, G. A. +6 more
We model the 2012 May 17 solar energetic particle event by combining the AWSoM and iPATH codes. Using this combined approach, we investigate particle acceleration when the parent coronal mass ejection (CME) is still close to the Sun. We have obtained reasonable agreements between our simulation and observations made by multiple spacecraft. We foll…
Isotropic x-ray bound on primordial black hole dark matter
Serpico, P. D.; Siegert, T.; Iguaz, J.
We revisit the constraints on evaporating primordial black holes (PBHs) from the isotropic x-ray and soft gamma-ray background in the mass range 1016- 1018 g . We find that they are stronger than usually inferred due to two neglected effects: (i) The contribution of the annihilation radiation due to positrons emitted in the e…
Source Counts Spanning Eight Decades of Flux Density at 1.4 GHz
Mauch, T.; Condon, J. J.; Cotton, W. D. +1 more
Brightness-weighted differential source counts S2n(S) spanning the eight decades of flux density between 0.25 µJy and 25 Jy at 1.4 GHz were measured from (1) the confusion brightness distribution in the MeerKAT DEEP2 image below 10 µJy, (2) counts of DEEP2 sources between 10 µJy and 2.5 mJy, and (3) counts of NVSS sour…
Proplyds in the flame nebula NGC 2024
Hines, Dean C.; Stapelfeldt, Karl R.; Clarke, Cathie J. +5 more
A recent survey of the inner 0.35 × 0.35 pc of the NGC 2024 star-forming region revealed two distinct millimetre continuum disc populations that appear to be spatially segregated by the boundary of a dense cloud. The eastern (and more embedded) population is ~0.2-0.5 Myr old, with an ALMA mm continuum disc detection rate of about $45\,$ per cent. …
New star clusters discovered towards the Galactic bulge direction using Gaia DR2
Corradi, W. J. B.; Ferreira, F. A.; Maia, F. F. S. +2 more
We report the discovery of 34 new open clusters and candidates as a result of a systematic search carried out in 200 adjacent fields of 1 × 1 deg2 area projected towards the Galactic bulge, using Gaia DR2 data. The objects were identified and characterized by a joint analysis of their photometric, kinematic, and spatial distribution tha…
The GRAVITY young stellar object survey. VII. The inner dusty disks of T Tauri stars
Lutz, D.; Genzel, R.; Sturm, E. +55 more
Context. T Tauri stars are surrounded by dust and gas disks. As material reservoirs from which matter is accreted onto the central star and planets are built, these protoplanetary disks play a central role in star and planet formation.
Aims: We aim at spatially resolving at sub-astronomical unit (sub-au) scales the innermost regions of the pr…