Search Publications
GRRMHD simulations of tidal disruption event accretion discs around supermassive black holes: jet formation, spectra, and detectability
Narayan, Ramesh; Curd, Brandon
We report results from general relativistic radiation magnetohydrodynamics (GRRMHD) simulations of a super-Eddington black hole (BH) accretion disc formed as a result of a tidal disruption event (TDE). We consider the fiducial case of a solar mass star on a mildly penetrating orbit disrupted by a supermassive BH of mass 10^6 M_⊙, and consider the …
Effects of anisotropic stress in interacting dark matter - dark energy scenarios
Yang, Weiqiang; Xu, Lixin; Pan, Supriya +1 more
We study a novel interacting dark energy - dark matter scenario where the anisotropic stress of the large-scale inhomogeneities is considered. The dark energy has a constant equation of state and the interaction model produces stable perturbations. The resulting picture is constrained using different astronomical data aiming to measure the impact …
Identification of Young Stellar Object candidates in the Gaia DR2 x AllWISE catalogue with machine learning methods
Szabados, L.; Beck, R.; Ábrahám, P. +8 more
The second Gaia Data Release (DR2) contains astrometric and photometric data for more than 1.6 billion objects with mean Gaia G magnitude <20.7, including many Young Stellar Objects (YSOs) in different evolutionary stages. In order to explore the YSO population of the Milky Way, we combined the Gaia DR2 data base with Wide-field Infrared Survey…
Upper Bound of Neutrino Masses from Combined Cosmological Observations and Particle Physics Experiments
Lahav, Ofer; Manera, Marc; Loureiro, Arthur +9 more
We investigate the impact of prior models on the upper bound of the sum of neutrino masses, ∑mν . Using data from the large scale structure of galaxies, cosmic microwave background, type Ia supernovae, and big bang nucleosynthesis, we argue that cosmological neutrino mass and hierarchy determination should be pursued using exact models,…
Disentangling the Planet from the Star in Late-Type M Dwarfs: A Case Study of TRAPPIST-1g
Bourrier, V.; Wakeford, H. R.; Lewis, N. K. +10 more
The atmospheres of late M stars represent a significant challenge in the characterization of any transiting exoplanets because of the presence of strong molecular features in the stellar atmosphere. TRAPPIST-1 is an ultracool dwarf, host to seven transiting planets, and contains its own molecular signatures that can potentially be imprinted on pla…
The VIMOS Ultra-Deep Survey: evidence for AGN feedback in galaxies with CIII]-λ1908 Å emission 10.8 to 12.5 Gyr ago
Maccagni, D.; Cimatti, A.; Schaerer, D. +19 more
We analyze the CIII]-λ1908 Å emission properties in a sample of 3899 star-forming galaxies (SFGs) at 2 < z < 3.8 drawn from the VIMOS Ultra-Deep Survey (VUDS). We find a median rest-frame equivalent width EW(CIII]) = 2.0 ± 0.2 to 2.2 ± 0.2 Å for the whole SFG population at 2 < z < 3 and 3 < z < 4, respectively. About 24% of SFGs …
A multimessenger study of the Milky Way's stellar disc and bulge with LISA, Gaia, and LSST
Korol, Valeriya; Rossi, Elena M.; Barausse, Enrico
The upcoming Laser Interferometer Space Antenna (LISA) mission offers the unique opportunity to study the Milky Way through gravitational wave (GW) radiation from a large population of Galactic binaries. Among the variety of Galactic GW sources, LISA is expected to individually resolve signals from ∼105 ultra-compact double white dwarf …
A Comprehensive Spectroscopic and Photometric Analysis of DA and DB White Dwarfs from SDSS and Gaia
Genest-Beaulieu, C.; Bergeron, P.
We present a detailed spectroscopic and photometric analysis of DA and DB white dwarfs drawn from the Sloan Digital Sky Survey with trigonometric parallax measurements available from the Gaia mission. The temperature and mass scales obtained from fits to ugriz photometry appear reasonable for both DA and DB stars, with almost identical mean masses…
A Survey for New Members of Taurus from Stellar to Planetary Masses
Luhman, K. L.; Esplin, T. L.
We present a large sample of new members of the Taurus star-forming region that extend from stellar to planetary masses. To identify candidate members at substellar masses, we have used color-magnitude diagrams and proper motions measured with several wide-field optical and infrared (IR) surveys. At stellar masses, we have considered the candidate…
Structure, kinematics, and ages of the young stellar populations in the Orion region
Brown, A. G. A.; de Zeeuw, P. T.; Zari, E.
We present a study of the three dimensional structure, kinematics, and age distribution of the Orion OB association, based on the second data release of the Gaia satellite (Gaia DR2). Our goal is to obtain a complete picture of the star formation history of the Orion complex and to relate our findings to theories of sequential and triggered star f…