Search Publications
Transport of angular momentum by stochastically excited waves as an explanation for the outburst of the rapidly rotating Be star HD49330
Neiner, C.; Lee, U.; Mathis, S. +3 more
Context. HD 49330 is an early Be star that underwent an outburst during its five-month observation with the CoRoT satellite. An analysis of its light curve revealed several independent p and g pulsation modes, in addition to showing that the amplitude of the modes is directly correlated with the outburst.
Aims: We modelled the results obtaine…
A multiplicity study of transiting exoplanet host stars. I. High-contrast imaging with VLT/SPHERE
Ginski, C.; Maxted, P. F. L.; Southworth, J. +3 more
Context. Many main-sequence stars are part of multiple systems. The effect of stellar multiplicity on planet formation and migration, however, is poorly understood.
Aims: We study the multiplicity of stars hosting known transiting extra-solar planets to test competing theories on the formation mechanisms of hot Jupiters.
Methods: We obse…
Evolution of the Alfvén Mach number associated with a coronal mass ejection shock
Gallagher, Peter T.; Carley, Eoin P.; Maguire, Ciara A. +1 more
The Sun regularly produces large-scale eruptive events, such as coronal mass ejections (CMEs) that can drive shock waves through the solar corona. Such shocks can result in electron acceleration and subsequent radio emission in the form of a type II radio burst. However, the early-phase evolution of shock properties and its relationship to type II…
Three short-period Jupiters from TESS. HIP 65Ab, TOI-157b, and TOI-169b
Tamura, M.; Bouchy, F.; Henning, T. +74 more
We report the confirmation and mass determination of three hot Jupiters discovered by the Transiting Exoplanet Survey Satellite (TESS) mission: HIP 65Ab (TOI-129, TIC-201248411) is an ultra-short-period Jupiter orbiting a bright (V = 11.1 mag) K4-dwarf every 0.98 days. It is a massive 3.213 ± 0.078 MJ planet in a grazing transit configu…
Molecular complexity in pre-stellar cores: a 3 mm-band study of L183 and L1544
Bizzocchi, Luca; Caselli, Paola; Vastel, Charlotte +4 more
Context. Pre-stellar cores (PSCs) are units of star formation. Besides representing early stages of the dynamical evolution leading to the formation of stars and planets, PSCs also provide a substrate for incipient chemical complexity in the interstellar space.
Aims: Our aim is to understand the influence of external conditions on the chemica…
Period-luminosity-metallicity relation of classical Cepheids
Clementini, G.; Ripepi, V.; Molinaro, R. +7 more
Context. Classical Cepheids (DCEPs) are the most important primary indicators for the extragalactic distance scale. Establishing the dependence on metallicity of their period-luminosity and period-Wesenheit (PL and PW) relations has deep consequences for the estimate of the Hubble constant (H0).
Aims: We investigate the dependence …
A detailed non-LTE analysis of LB-1: Revised parameters and surface abundances
Allende Prieto, C.; Smartt, S. J.; Dufton, P. L. +8 more
Context. It has recently been proposed that LB-1 is a binary system at 4 kpc consisting of a B-type star of 8 M⊙ and a massive stellar black hole (BH) of 70 M⊙. This finding challenges our current theories of massive star evolution and formation of BHs at solar metallicity.
Aims: Our objective is to derive the effective …
Evolved massive stars at low metallicity. II. Red supergiant stars in the Small Magellanic Cloud
Yang, Ming; Bonanos, Alceste Z.; Jiang, Bi-Wei +9 more
We present the most comprehensive red supergiant (RSG) sample for the Small Magellanic Cloud (SMC) to date, including 1239 RSG candidates. The initial sample was derived based on a source catalog for the SMC with conservative ranking. Additional spectroscopic RSGs were retrieved from the literature, and RSG candidates were selected based on the in…
The Villafranca catalog of Galactic OB groups. I. Systems with O2-O3.5 stars
Maíz Apellániz, J.; Barbá, R. H.; Sota, A. +2 more
Context. The spectral classifications of the Galactic O-Star Spectroscopic Survey (GOSSS) and the astrometric and photometric data from Gaia have significantly improved our ability to measure distances and determine memberships of stellar groups (clusters, associations, or parts thereof) with OB stars. In the near future, the situation will be fur…
Observed binary populations reflect the Galactic history. Explaining the orbital period-mass ratio relation in wide hot subdwarf binaries
Bobrick, A.; Vučković, M.; Vos, J.
Context. Wide hot subdwarf B (sdB) binaries with main-sequence companions are outcomes of stable mass transfer from evolved red giants. The orbits of these binaries show a strong correlation between their orbital periods and mass ratios. The origins of this correlation have, so far, been lacking a conclusive explanation.
Aims: We aim to find …