Search Publications
TOI-2046b, TOI-1181b, and TOI-1516b, three new hot Jupiters from TESS: planets orbiting a young star, a subgiant, and a normal star
Latham, David W.; Cochran, William D.; Endl, Michael +54 more
We present the confirmation and characterization of three hot Jupiters, TOI-1181b, TOI-1516b, and TOI-2046b, discovered by the TESS space mission. The reported hot Jupiters have orbital periods between 1.4 and 2.05 d. The masses of the three planets are 1.18 ± 0.14 MJ, 3.16 ± 0.12 MJ, and 2.30 ± 0.28 MJ, for TOI-11…
Stellar proper motions in the outskirts of classical dwarf spheroidal galaxies with Gaia EDR3
Pace, Andrew B.; Zivick, Paul; Riley, Alexander H. +2 more
We use Gaia EDR3 data to identify stars associated with six classical dwarf spheroidals (dSphs) (Draco, Ursa Minor, Sextans, Sculptor, Fornax, Carina) at their outermost radii, beyond their nominal King stellar limiting radius. For all of the dSphs examined, we find radial velocity matches with stars residing beyond the King limiting radius and wi…
Discovery of hot subdwarfs covered with helium-burning ash
Werner, Klaus; Reindl, Nicole; Geier, Stephan +1 more
Helium-rich subdwarf O stars (sdOs) are hot compact stars in a pre-white dwarf evolutionary state. Most of them have effective temperatures and surface gravities in the range Teff = 40 000-50 000 K and log g = 5.5-6.0. Their atmospheres are helium dominated. If present at all, C, N, and O are trace elements. The abundance patterns are e…
Kinematics of the molecular interstellar medium probed by Gaia: steep velocity dispersion-size relation, isotropic turbulence, and location-dependent energy dissipation
Li, Guang-Xing; Chen, Bing-Qiu; Zhou, Ji-Xuan
The evolution of the molecular interstellar medium is controlled by processes such as turbulence, gravity, stellar feedback, and Galactic shear. AL a part of the ISM-6D project, using Gaia astrometric measurements towards a sample of young stellar objects (YSOs), we study the morphology and kinematic structure of the associated molecular gas. We i…
Distance and age of the massive stellar cluster Westerlund 1. I. Parallax method using Gaia-EDR3
Damineli, Augusto; Navarete, Felipe; Almeida, Leonardo A. +2 more
Westerlund 1 (Wd 1) is one of the most massive young star clusters in the Milky Way. Although relevant for star formation and evolution, its fundamental parameters are not yet very well constrained. We aim to derive an accurate distance and provide constraints on the cluster age. We used the photometric and astrometric information available in the…
The OmegaWhite survey for short-period variable stars - VII. High amplitude short-period blue variables
Ramsay, Gavin; Buckley, David A. H.; Kupfer, Thomas +11 more
Blue Large-Amplitude Pulsators (BLAPs) are a relatively new class of blue variable stars showing periodic variations in their light curves with periods shorter than a few tens of minutes and amplitudes of more than 10 per cent. We report nine blue variable stars identified in the OmegaWhite survey conducted using ESO's VST, which shows a periodic …
The tidal evolution of the Fornax dwarf spheroidal and its globular clusters
Fattahi, Azadeh; Navarro, Julio F.; Errani, Raphaël +2 more
The dark matter content of the Fornax dwarf spheroidal galaxy inferred from its kinematics is substantially lower than expected from LCDM cosmological simulations. We use N-body simulations to examine whether this may be the result of Galactic tides. We find that, despite improved proper motions from the Gaia mission, the pericentric distance of F…
Modelling the secular evolution of protoplanetary disc dust sizes - a comparison between the viscous and magnetic wind case
Tabone, Benoît; Zagaria, Francesco; Rosotti, Giovanni P. +1 more
For many years, protoplanetary discs have been thought to evolve viscously: angular momentum redistribution leads to accretion and outward disc spreading. Recently, the hypothesis that accretion is due, instead, to angular momentum removal by magnetic winds gained new popularity: no disc spreading is expected in this case. In this paper, we run se…
Revisiting the evolved hypergiants in the Magellanic Clouds
Borges Fernandes, M.; Kraus, M.; Maravelias, G. +2 more
The massive stars that survive the phase of red supergiants (RSGs) spend the rest of their life in extremity. Their unstable atmospheres facilitate the formation and episodic ejection of shells that alter the stellar appearance and surroundings. In the present study, we revise the evolutionary state of eight hypergiants in the Magellanic Clouds, f…
The SN Ia runaway LP 398-9: detection of circumstellar material and surface rotation
Hermes, J. J.; Blouin, Simon; Zakamska, Nadia L. +12 more
A promising progenitor scenario for Type Ia supernovae (SNeIa) is the thermonuclear detonation of a white dwarf in a close binary system with another white dwarf. After the primary star explodes, the surviving donor can be spontaneously released as a hypervelocity runaway. One such runaway donor candidate is LP 398-9, whose orbital trajectory trac…