Search Publications
Stellar wind properties of the nearly complete sample of O stars in the low metallicity young star cluster NGC 346 in the SMC galaxy
Hamann, W. -R.; Gallagher, J. S.; Prinja, R. K. +9 more
Context. Massive stars are among the main cosmic engines driving the evolution of star-forming galaxies. Their powerful ionising radiation and stellar winds inject a large amount of energy in the interstellar medium. Furthermore, mass-loss (Ṁ) through radiatively driven winds plays a key role in the evolution of massive stars. Even so, the wind ma…
Observations of a Magellanic Corona
Fox, Andrew J.; Wakker, Bart P.; Lehner, Nicolas +6 more
The Large Magellanic Cloud (LMC) and the Small Magellanic Cloud (SMC) are the closest massive satellite galaxies of the Milky Way. They are probably on their first passage on an infalling orbit towards our Galaxy1 and trace the continuing dynamics of the Local Group2. Recent measurements of a high mass for the LMC (Mhalo…
Stellar Companions to TESS Objects of Interest: A Test of Planet-Companion Alignment
Howard, Andrew W.; Behmard, Aida; Dai, Fei
We present a catalog of stellar companions to host stars of Transiting Exoplanet Survey Satellite Objects of Interest (TOIs) identified from a marginalized likelihood ratio test that incorporates astrometric data from the Gaia Early Data Release 3 catalog (EDR3). The likelihood ratio is computed using a probabilistic model that incorporates parall…
Low-mass young stars in the Milky Way unveiled by DBSCAN and Gaia EDR3: Mapping the star forming regions within 1.5 kpc
Alcalá, J. M.; Micela, G.; Jeffries, R. D. +6 more
Context. With an unprecedented astrometric and photometric data precision, Gaia EDR3 provides, for the first time, the opportunity to systematically detect and map, in the optical bands, the low-mass populations of the star forming regions (SFRs) in the Milky Way.
Aims: We aim to provide a catalogue of the Gαiα EDR3 data (photometry, proper m…
Study of changes in the pulsation period of 148 Galactic Cepheid variables
Szabados, L.; Cseh, B.; Molnár, L. +7 more
Investigating period changes of classical Cepheids through the framework of O - C diagrams provides a unique insight to the evolution and nature of these variable stars. In this work, the new or extended O - C diagrams for 148 Galactic classical Cepheids are presented. By correlating the calculated period change rates with the Gaia EDR3 colours, w…
TOI-1759 b: A transiting sub-Neptune around a low mass star characterized with SPIRou and TESS
Moutou, C.; Carmona, A.; Donati, J. -F. +57 more
We report the detection and characterization of the transiting sub-Neptune TOI-1759 b, using photometric time series from the Transiting Exoplanet Survey Satellite (TESS) and near-infrared spectropolarimetric data from the Spectro-Polarimètre Infra Rouge (SPIRou) on the Canada-France-Hawaii Telescope. TOI-1759 b orbits a moderately active M0V star…
The Local Group Mass in the Light of Gaia
Vasiliev, Eugene; Evans, N. Wyn; Strigari, Louis E. +3 more
High-accuracy proper motions (PMs) of M31 and other Local Group (LG) satellites have now been provided by the Gaia satellite. We revisit the timing argument to compute the total mass M of the LG from the orbit of the Milky Way and M31, allowing for the cosmological constant. We rectify a systematic effect caused by the presence of the Large Magell…
Mapping the Complex Kinematic Substructure in the TW Hya Disk
Andrews, Sean M.; Bae, Jaehan; Bergin, Edwin A. +6 more
We present ALMA observations of CO J = 2 - 1 and CS J = 5 - 4 emission from the disk around TW Hydrae. Both molecules trace a predominantly Keplerian velocity structure, although a slowing of the rotation velocity is detected at the outer edge of the disk beyond ≈140 au in CO emission. This was attributed to the enhanced pressure support from the …
Measuring Elemental Abundances of JWST Target Stars for Exoplanet Characterization. I. FGK Stars
Wang, Ji; Kolecki, Jared R.
With the launch of the JWST, we will obtain more precise data for exoplanets than ever before. However, these data can only inform and revolutionize our understanding of exoplanets when placed in the larger context of planet-star formation. Therefore, gaining a deeper understanding of their host stars is equally important and synergistic with the …
Characterisation of Galactic carbon stars and related stars from Gaia EDR3
de Laverny, P.; Figueras, F.; Romero-Gómez, M. +1 more
The third early Gaia data release (EDR3) has improved the accuracy of the astrometric parameters of numerous long-period variable (LPV) stars. Many of these stars are on the asymptotic giant branch (AGB), showing either a C-rich or O-rich envelope and are characterised by high luminosity, changing surface composition, and intense mass loss. This m…